{"gene":"AMFR","run_date":"2026-06-09T22:02:43","timeline":{"discoveries":[{"year":2001,"finding":"gp78/AMFR is a RING finger-dependent E3 ubiquitin ligase intrinsic to the ER membrane. It recruits the E2 enzyme MmUBC7 through a region distinct from the RING finger, can auto-ubiquitinate itself for proteasomal degradation, and mediates degradation of the ERAD substrate CD3-delta in a RING finger- and MmUBC7-dependent manner.","method":"Overexpression and dominant-negative (RING finger mutant) constructs in mammalian cells; ubiquitination assays; CD3-delta degradation assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — foundational study with multiple orthogonal functional assays (ubiquitination, degradation, dominant-negative mutagenesis) in mammalian cells, subsequently replicated across many independent labs","pmids":["11724934"],"is_preprint":false},{"year":2005,"finding":"gp78 associates with Insig-1 (but not Insig-2) and is required for sterol-regulated ubiquitination and degradation of HMG-CoA reductase (HMGCR). gp78 couples regulated ubiquitination to degradation by also binding VCP/p97, with Insig-1 serving as a bridge between gp78/VCP and the reductase substrate.","method":"Co-immunoprecipitation; RNAi knockdown of gp78; sterol-regulated ubiquitination and pulse-chase degradation assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, RNAi, ubiquitination assays; replicated and extended by multiple independent groups","pmids":["16168377"],"is_preprint":false},{"year":2004,"finding":"gp78 physically interacts with p97/VCP and enhances p97/VCP-polyubiquitin association, facilitating retrotranslocation of ubiquitinated ERAD substrates. A specific p97/VCP-interacting domain on gp78 is required; its deletion prevents CD3-delta degradation and causes accumulation of polyubiquitinated CD3-delta.","method":"Co-immunoprecipitation; domain deletion analysis; RNAi knockdown; CD3-delta degradation assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, deletion mapping, RNAi, and functional substrate degradation assay; replicated by other labs","pmids":["15331598"],"is_preprint":false},{"year":2006,"finding":"Efficient gp78-mediated ERAD requires three functional domains: the RING finger, a ubiquitin-binding CUE domain, and a specific Ube2g2-binding site (G2BR) distinct from the RING finger. Disruption of any one of these domains abolishes gp78-mediated ubiquitylation and protein degradation, with substrates accumulating in their fully glycosylated ER-resident forms.","method":"Domain mutagenesis; in vivo ubiquitination assays; glycosylation analysis as ERAD readout","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — systematic mutagenesis of multiple domains combined with functional ubiquitination and degradation assays, replicated in follow-up structural studies","pmids":["16407162"],"is_preprint":false},{"year":2006,"finding":"gp78 contains a novel VIM (VCP-interacting motif) that mediates direct interaction with the ND1 domain of p97/VCP, recruits p97/VCP to the ER, and is required for gp78-mediated substrate degradation. Inhibition of p97/VCP (but not Ufd1 alone at high gp78 overexpression levels) stabilizes CD3-delta, suggesting gp78 can operate in a Ufd1-independent pathway in parallel with the canonical VCP-Ufd1-Npl4 mechanism.","method":"Domain deletion and mutation; co-immunoprecipitation; RNAi of Ufd1 and p97/VCP; CD3-delta degradation assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple domain constructs, RNAi, and functional substrate assays; mechanistically detailed with pathway context","pmids":["16987818"],"is_preprint":false},{"year":2006,"finding":"gp78 mediates sterol-regulated degradation of Insig-1 (but not Insig-2) in sterol-depleted cells. Sterols prevent Insig-1 ubiquitination by displacing gp78 from Insig-1 through sterol-induced binding of Scap to Insig-1, explaining ER retention of Scap while reductase is ubiquitinated.","method":"Co-immunoprecipitation; RNAi knockdown of gp78; ubiquitination assays; pulse-chase protein stability assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple methods (Co-IP, RNAi, ubiquitination, pulse-chase) in a single rigorous study; replicated by independent groups","pmids":["17043353"],"is_preprint":false},{"year":2007,"finding":"Ufd1 directly interacts with gp78 and functions as a cofactor that enhances gp78 E3 activity. The monoubiquitin-binding site in Ufd1 is required for enhancement of gp78 ubiquitination activity, while the polyubiquitin-binding site is critical for a post-ubiquitination step in ERAD. Ufd1 accelerates ubiquitination and degradation of HMG-CoA reductase.","method":"Co-immunoprecipitation; domain mutagenesis; in vitro and in vivo ubiquitination assays; pulse-chase degradation assays","journal":"Cell metabolism","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — direct binding, mutagenesis of Ufd1 binding domains, in vitro and in vivo ubiquitination assays in a rigorous single study","pmids":["17681147"],"is_preprint":false},{"year":2007,"finding":"gp78 associates with and ubiquitinates the transmembrane metastasis suppressor KAI1 (CD82), targeting it for proteasomal degradation. This prometastatic activity requires the E3 ligase activity of gp78. Suppression of gp78 increases KAI1 abundance and reduces metastatic potential.","method":"Co-immunoprecipitation; RNAi knockdown; in vivo metastasis assays; RING finger mutant; tissue microarray","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, RING mutant, RNAi rescue, and in vivo metastasis assays; mechanistically validated","pmids":["18037895"],"is_preprint":false},{"year":2008,"finding":"gp78 participates in ERAD of CFTRΔf508 by recognizing monoubiquitin already conjugated to CFTRΔf508 via its CUE domain and catalyzing further polyubiquitylation in an E4-like manner. RMA1 functions as the upstream E3 and gp78 acts downstream as an E4-like polyubiquitylation factor.","method":"Domain swapping/deletion analysis; in vitro polyubiquitylation assay; siRNA knockdown of RMA1; co-immunoprecipitation","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro polyubiquitylation assay with domain deletion plus RNAi epistasis in a single rigorous study","pmids":["18216283"],"is_preprint":false},{"year":2009,"finding":"The G2BR domain of gp78 binds selectively and with high affinity to the E2 Ube2g2 at a region distinct from E1- and RING-binding sites. This binding causes conformational changes in Ube2g2 affecting ubiquitin loading and produces an ~50-fold increase in E2-RING affinity, markedly increasing ubiquitylation via an allosteric mechanism.","method":"NMR structural analysis; surface plasmon resonance; in vitro ubiquitylation assays; mutagenesis","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — NMR structure combined with mutagenesis and quantitative binding/activity assays; allosteric mechanism confirmed","pmids":["19560420"],"is_preprint":false},{"year":2009,"finding":"gp78 promotes ubiquitination and proteasomal degradation of SOD1 and ataxin-3. gp78 interacts with both proteins; overexpression promotes their ubiquitination and degradation while knockdown stabilizes them. gp78 also suppresses aggregate formation of mutant SOD1 and protects cells from mutant SOD1-induced death.","method":"Co-immunoprecipitation; overexpression and siRNA knockdown; ubiquitination assays; aggregation assays","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — Co-IP and functional overexpression/knockdown in a single lab study","pmids":["19661182"],"is_preprint":false},{"year":2009,"finding":"Both Hrd1 and gp78 bind cholera toxin (CTA1 subunit) and protein disulfide isomerase (PDI), and expression of dominant-negative forms of Hrd1 and gp78 or dominant-negative Ube2g2 decreases CTA1 retro-translocation. CT association with Hrd1/gp78 is blocked by dominant-negative Derlin-1, suggesting sequential engagement: CT → Derlin-1 → Hrd1/gp78.","method":"Dominant-negative constructs; pulldown/binding studies; retro-translocation assays; RNAi knockdown","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — binding assays with epistasis experiments, but role is partially non-ubiquitination-based and mechanism not fully resolved","pmids":["19864457"],"is_preprint":false},{"year":2009,"finding":"Hrd1 targets gp78 for proteasomal degradation in a manner independent of gp78's own ubiquitin ligase activity, establishing cross-regulation between the two ER E3 ligases. Reduced Hrd1 increases gp78 levels, which in turn decreases the gp78 substrate Insig-1.","method":"Mouse embryonic fibroblasts lacking Hrd1; siRNA knockdown; protein stability assays","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MEF genetic model and acute siRNA manipulation, two orthogonal loss-of-function approaches, single lab","pmids":["19835843"],"is_preprint":false},{"year":2010,"finding":"Mutant huntingtin interacts with gp78 via its HEAT repeats 2&3 binding to the CUE domain of gp78, competitively reducing polyubiquitinated protein binding to gp78 and sterically blocking gp78-p97/VCP interaction, thereby impairing ERAD and inducing ER stress. Polyglutamine expansion aggravates this inhibitory effect.","method":"Co-immunoprecipitation; domain mapping; competitive binding assays; ER stress markers","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — domain mapping Co-IP with competitive binding; single lab with multiple constructs","pmids":["20126661"],"is_preprint":false},{"year":2010,"finding":"gp78 promotes cell proliferation and mammary gland hyperplasia by targeting the metastasis suppressor KAI1 for ERAD. Stable knockdown of gp78 in HEK293 cells increases KAI1 expression and reduces proliferation, an effect rescued by concomitant KAI1 knockdown, placing KAI1 downstream of gp78 in proliferation control.","method":"MMTV-gp78 transgenic mice; stable knockdown; KAI1 co-knockdown rescue; BrdU proliferation assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — transgenic mouse plus rescue epistasis experiment; single lab","pmids":["20089858"],"is_preprint":false},{"year":2011,"finding":"Sterol-accelerated HMGCR degradation requires interplay of two Insigs and two ubiquitin ligases: gp78 (recruits Insig-1) and Trc8 (recruits both Insig-1 and Insig-2). Combined RNAi knockdown of gp78 and Trc8 produces >90% inhibition of sterol-induced reductase degradation; gp78 knockdown leads to compensatory increases in Trc8 and Insig-1.","method":"siRNA knockdown (single and combined); sterol-induced ubiquitination and degradation assays; protein level analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis by combined RNAi of two ligases with quantitative ubiquitination assays; independent follow-up of prior findings","pmids":["22143767"],"is_preprint":false},{"year":2011,"finding":"gp78 forms a complex with two ER membrane proteins, SPFH2 and TMUB1, where TMUB1 bridges SPFH2 to gp78. RNAi-mediated knockdown of SPFH2 and TMUB1 blunts sterol-induced ubiquitination and degradation of endogenous HMG-CoA reductase.","method":"Co-immunoprecipitation; RNAi knockdown; sterol-induced ubiquitination and degradation assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP identifying complex components combined with functional RNAi; single lab","pmids":["21343306"],"is_preprint":false},{"year":2012,"finding":"Gp78 RING finger cysteines undergo S-palmitoylation. Five palmitoyl acyltransferases increase gp78 RING finger palmitoylation. ER-localized DHHC6 overexpression promotes peripheral ER distribution of gp78, while RING finger mutation or palmitoylation inhibition restricts gp78 to the central ER, linking palmitoylation to gp78 subcellular distribution.","method":"Palmitoylation assay; PAT overexpression screen; immunofluorescence microscopy; RING finger mutagenesis","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — palmitoylation biochemistry with localization consequences, mutagenesis; single lab","pmids":["22728137"],"is_preprint":false},{"year":2013,"finding":"Gp78 overexpression (but not RING mutant) induces mitochondrial fragmentation and ubiquitination plus proteasome-dependent degradation of mitofusins Mfn1 and Mfn2. After mitochondrial depolarization, Gp78 induces mitophagy dependent on ubiquitin ligase activity and Mfn1 (but not Mfn2). Gp78-induced mitophagy is Parkin-independent.","method":"Overexpression of wild-type vs RING mutant Gp78; CCCP-induced depolarization; siRNA knockdown of Atg5, Parkin, Mfn1/2; LC3-GFP autophagy marker; OxPhos protein levels","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — RING mutant, multiple siRNA knockdowns, autophagy marker, mitophagy quantification; multiple orthogonal methods in one study","pmids":["23427266"],"is_preprint":false},{"year":2013,"finding":"Gp78, localized at the ER-mitochondria interface, regulates MAVS expression and RLR antiviral signaling via two parallel pathways: (1) E3 ubiquitin ligase/ERAD activity directly degrades MAVS; (2) Gp78 RING domain interacts with both N- and C-terminal domains of MAVS and attenuates RLR signaling independently of ERAD. Gp78 depletion enhances type I IFN signaling.","method":"Co-immunoprecipitation; Gp78 mutant constructs; RNAi knockdown; IFN reporter assays; VSV infection assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP domain mapping, multiple loss-of-function constructs, functional signaling assays; single lab","pmids":["24285545"],"is_preprint":false},{"year":2013,"finding":"AMF endocytosis through a PI3K- and dynamin-dependent raft pathway requires Gp78 and stimulates Rac1 activation. AMF uptake inhibits Gp78-induced degradation of mitofusins 1 and 2, thereby preventing Gp78-dependent mitochondrial fission. Gp78 knockdown reduces both AMF-induced Rac1 activation and dynamin-dependent AMF internalization.","method":"Dynamin inhibitor; PI3K inhibitor; dominant-negative Rac1; Rac1 inhibitor; Gp78 knockdown; Mfn1/2 protein levels; mitochondrial morphology imaging","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple pharmacological and genetic inhibitors with functional readouts; single lab","pmids":["23690547"],"is_preprint":false},{"year":2014,"finding":"Upon cytoplasmic DNA stimulation, AMFR is recruited to STING in an INSIG1-dependent manner. The AMFR-INSIG1 E3 complex catalyzes K27-linked polyubiquitination of STING, which serves as a platform for recruiting TBK1 and facilitating TBK1 translocation to perinuclear microsomes. Depletion of AMFR or INSIG1 impairs STING-mediated antiviral gene induction.","method":"Co-immunoprecipitation; RNAi knockdown; ubiquitination assays; Insig1 knockout mice (myeloid-specific); HSV-1 infection model","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP, ubiquitination site mapping, in vivo knockout mouse model, and functional antiviral assays; replicated in follow-up papers","pmids":["25526307"],"is_preprint":false},{"year":2014,"finding":"gp78 ubiquitinates not only ERAD substrates but also the machinery protein Ubl4A (component of the Bag6 chaperone complex), leading to irreversible proteolytic inactivation of Bag6. The DUB USP13 associates with gp78 and removes ubiquitin conjugates from Ubl4A to maintain Bag6 functionality and sharpen gp78 substrate specificity.","method":"Co-immunoprecipitation; ubiquitination assays; DUB identification; cell-based functional assays for Bag6/ERAD","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, ubiquitination assays, functional Bag6 inactivation readout; single lab with multiple orthogonal methods","pmids":["24424410"],"is_preprint":false},{"year":2014,"finding":"After ER stress induction, HERP is rapidly degraded by Ube2g2-gp78-mediated ubiquitylation and proteasomal degradation during ER stress recovery. This requires physical interaction between the CUE domain of gp78 and the UBL domain of HERP, which is essential for HERP degradation in vivo.","method":"In vitro polyubiquitylation assay; domain interaction mapping; cell-based degradation assays; siRNA knockdown","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — in vitro ubiquitylation with domain mapping and in vivo functional assays; single lab","pmids":["24496447"],"is_preprint":false},{"year":2014,"finding":"gp78 interacts with the C-terminal region of HSPA5/GRP78, mediates HSPA5 ubiquitination and degradation, specifically at K447. HDAC6-mediated deacetylation of HSPA5 at K353 promotes GP78 binding and ubiquitination; acetylation at K353 reduces GP78-mediated ubiquitination at K447.","method":"Co-immunoprecipitation; site-directed mutagenesis; ubiquitination assays; siRNA knockdown of GP78 and HDAC6","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, mutagenesis, and ubiquitination assays identifying specific lysine residues; single lab","pmids":["26119938"],"is_preprint":false},{"year":2014,"finding":"Polyubiquitylation of autocrine motility factor (AMF/PGI) requires cooperative interaction between gp78 and TRIM25: TRIM25 mediates initial ubiquitylation, then gp78 catalyzes polyubiquitylation in an E4-like manner. TRIM25 also ubiquitinates gp78 itself, modulating gp78 steady-state levels.","method":"In vitro polyubiquitylation assay with Ub-DHFR model substrate; co-immunoprecipitation; siRNA knockdown; protein stability assays","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — in vitro E4 assay, Co-IP, and functional degradation assays; single lab","pmids":["24810856"],"is_preprint":false},{"year":2014,"finding":"gp78 extends polyubiquitin chains from the distal end through cooperative action of its G2BR and CUE domains: G2BR binds donor Ube2g2~Ub to promote ubiquitin transfer in cis, while the CUE domain binds the growing ubiquitin chain preferentially over monoubiquitin to position the distal ubiquitin correctly for chain elongation.","method":"In vitro polyubiquitin chain assembly assays; domain deletion/mutagenesis; binding assays","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — in vitro chain assembly with domain mutagenesis; single lab","pmids":["25409783"],"is_preprint":false},{"year":2015,"finding":"gp78 acts downstream of Hrd1 in ERAD: Hrd1 is the essential retrotranslocation/ubiquitination module, while gp78 knockdown does not affect retrotranslocation or initial ubiquitination of ERAD substrates but promotes ERAD via cooperation with the BAG6 chaperone complex in a post-retrotranslocation step.","method":"shRNA knockdown; CRISPR-based genetic tools; biochemical retrotranslocation assays; ubiquitination assays; BAG6 co-functional studies","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR and shRNA with multiple substrate assays; single lab, but rigorous epistasis analysis","pmids":["26424800"],"is_preprint":false},{"year":2015,"finding":"p38 MAP kinase phosphorylates gp78 at Ser-538 (S538) in a 14-3-3/WW-domain-containing region at the mitochondria-associated ER. S538 phosphorylation limits gp78-induced mitochondrial fission and Mfn1/Mfn2 degradation, and the phosphomimetic S538D mutation prevents gp78 promotion of ER-mitochondria interaction without affecting in vitro E3 ubiquitin ligase activity.","method":"Mass spectrometry phosphopeptide mapping; 3F3A antibody as phosphorylation reporter; phosphomimetic/phosphonull mutagenesis; p38 MAPK inhibitor (SB203580); mitochondrial morphology imaging; in vitro ubiquitin ligase assay","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — MS phosphosite identification, functional mutagenesis, and inhibitor studies; single lab with multiple orthogonal methods","pmids":["26337390"],"is_preprint":false},{"year":2016,"finding":"MGRN1, a cytosolic E3 ligase, ubiquitylates GP78 in trans via non-canonical K11-linked polyubiquitination, maintaining constitutively low GP78 levels in healthy cells and suppressing mitophagy. Elevated cytosolic Ca2+ (from mitochondrial stress) reduces MGRN1-GP78 interaction and GP78 ubiquitylation, enabling GP78-mediated mitophagy.","method":"Co-immunoprecipitation; ubiquitination assays specifying K11 linkage; Ca2+ chelation experiments; MGRN1 catalytic mutants; protein stability assays","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, linkage-specific ubiquitination, Ca2+ manipulation, and catalytic mutant; single lab with multiple methods","pmids":["26743086"],"is_preprint":false},{"year":2017,"finding":"Conformational dynamics in Ube2g2 reveals that G2BR binding and RING binding of gp78 drive sequential progression toward ubiquitin transfer through redistribution of conformational populations. The G2BR-bound state of Ube2g2 shows allosteric changes that are prerequisite for RING-mediated activation, establishing a dynamic energy landscape model for E2 activation.","method":"NMR conformational dynamics analysis; NMR chemical shift perturbation; mutagenesis; in vitro ubiquitylation assays","journal":"Structure","confidence":"High","confidence_rationale":"Tier 1 / Moderate — NMR structural dynamics with mutagenesis and functional assays; single rigorous study","pmids":["28434917"],"is_preprint":false},{"year":2017,"finding":"CDK5 directly phosphorylates GP78 at Ser516, promoting ubiquitination and degradation of GP78. GP78 overexpression or interference with Ser516 phosphorylation protects neurons against MPP+-induced cell death in Parkinson's disease models.","method":"In vitro kinase assay; site-directed mutagenesis (Ser516); GP78 overexpression and phosphomutants; MPTP/MPP+ cellular and animal models; ubiquitination assays","journal":"Molecular neurobiology","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — in vitro kinase assay with mutagenesis and functional cell death assay; single lab","pmids":["28528366"],"is_preprint":false},{"year":2018,"finding":"RNF145 and gp78 independently co-ordinate HMGCR ubiquitination and degradation. CRISPR genome-wide screens identify that in the absence of both RNF145 and gp78, a third UBE2G2-dependent E3 ligase Hrd1 partially regulates HMGCR. RNF145 is sterol-responsive, accumulates following sterol depletion, and is recruited to HMGCR via Insigs upon sterol addition.","method":"CRISPR/Cas9 genome-wide screens; endogenous HMGCR reporter; siRNA knockdown; ubiquitination assays; sterol regulation assays","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — unbiased genome-wide CRISPR screen combined with functional validation; orthogonal to prior studies","pmids":["30543180"],"is_preprint":false},{"year":2021,"finding":"CCL1 binds AMFR as a receptor on fibroblasts, triggering AMFR E3 ligase-mediated ubiquitination of the ERK inhibitor Spry1. This ubiquitination activates Ras-mediated profibrotic protein synthesis, driving fibroblast-to-myofibroblast differentiation and pulmonary fibrosis.","method":"Mass spectrometry of CCL1 complexes; AMFR deletion in fibroblasts; ubiquitination assays; Ras-ERK pathway activation assays; mouse models of pulmonary fibrosis","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 / Strong — MS-based receptor identification, cell-specific knockout, ubiquitination assays, and in vivo fibrosis model; multiple orthogonal methods","pmids":["34407391"],"is_preprint":false},{"year":2022,"finding":"gp78-Insig-1 E3 complex mediates mixed-linkage ubiquitination of NLRP3, inhibiting NLRP3 inflammasome activation by suppressing NLRP3 oligomerization and subcellular translocation. Insig-1 is required for gp78-NLRP3 interaction. gp78 or Insig-1 deficiency in myeloid cells exacerbates NLRP3-dependent inflammation in vivo.","method":"Co-immunoprecipitation; ubiquitination assays (linkage specificity); inflammasome activation assays (oligomerization, translocation); myeloid-specific knockout mice; LPS-induced inflammation and alum-induced peritonitis models","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP, ubiquitination assays with linkage characterization, in vivo knockout mouse models; multiple orthogonal methods","pmids":["35110683"],"is_preprint":false},{"year":2022,"finding":"AMFR, following TSLP stimulation in alveolar macrophages, directly associates with CIS (cytokine-inducible SH2-containing protein) and catalyzes K48-linked polyubiquitination of CIS, blocking CIS inhibition of STAT5 phosphorylation and promoting downstream GM-CSF production that drives Th2/eosinophilic asthma inflammation.","method":"Co-immunoprecipitation; K48 linkage-specific ubiquitination assays; AMFR conditional knockout mice; STAT5 phosphorylation assays; GM-CSF ELISA; allergy models","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP, specific ubiquitination linkage, AMFR conditional KO mice, and signaling assays with in vivo disease models","pmids":["35333296"],"is_preprint":false},{"year":2022,"finding":"AMFR mediates K542-specific ubiquitination of EAAT2 (excitatory amino acid transporter 2) that specifically promotes EAAT2 oligomer formation rather than degradation, increasing functional transporter levels. AMFR and EAAT2 oligomer levels are simultaneously decreased in hippocampus of epilepsy models.","method":"Co-immunoprecipitation; site-directed mutagenesis (K542); ubiquitination assays; oligomer detection; in vivo epilepsy mouse models; FDA drug screen","journal":"JCI insight","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, mutagenesis defining specific ubiquitination site, functional oligomerization assay; single lab","pmids":["35938532"],"is_preprint":false},{"year":2023,"finding":"AMFR directly interacts with TAK1-binding protein 3 (TAB3) in the ER, inducing K27-linked polyubiquitination of TAB3 at K649, thereby promoting TAK1 activation and intracellular S. aureus-induced NF-κB-mediated inflammation. The S. aureus virulence factor HlgB binds AMFR and modulates this TAB3 signaling.","method":"Co-immunoprecipitation; CRISPR-Cas9 screen; ubiquitination assays (K27-linkage); site-directed mutagenesis (K649); TAK1 activation assays; pneumonia mouse models","journal":"Nature microbiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — CRISPR screen, Co-IP, K27 ubiquitination with mutagenesis, in vivo infection models; multiple rigorous methods","pmids":["36593296"],"is_preprint":false},{"year":2023,"finding":"Bi-allelic truncating variants in AMFR cause autosomal recessive hereditary spastic paraplegia. Loss of AMFR disturbs lipid homeostasis causing lipid droplet accumulation in neural stem cells and patient fibroblasts rescued by AMFR re-expression. In amfra-/- zebrafish, motor neuron branching defects and touch-evoked escape response abnormalities are observed, and statins improve these phenotypes.","method":"Patient whole genome sequencing; patient-derived fibroblasts and neural stem cells; AMFR re-expression rescue; electron microscopy (ER morphology); zebrafish amfra knockout; statin treatment","journal":"Acta neuropathologica","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — patient cells, rescue experiments, and in vivo zebrafish model; novel disease mechanism but single publication","pmids":["37119330"],"is_preprint":false},{"year":2023,"finding":"AMFR promotes proteasomal degradation of HMGCR in response to influenza virus infection and activates innate immunity components TBK1 and IRF3. AMFR knockdown inhibits HMGCR ubiquitination and inactivates TBK1/IRF3 signaling during influenza infection.","method":"siRNA knockdown of AMFR; ubiquitination assays; TBK1/IRF3 phosphorylation assays; influenza virus infection model","journal":"Virology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — siRNA with western blot readouts only; single lab, single study","pmids":["37703797"],"is_preprint":false},{"year":2024,"finding":"AMFR variant R594C (patient-derived) results in decreased K27-linked STING ubiquitination and reduced STING trafficking from ER to Golgi compared to wild-type AMFR, impairing type I IFN responses and increasing VZV replication. Lentiviral transduction with wild-type AMFR partially reconstitutes STING-mediated signaling in patient PBMCs.","method":"Overexpression of WT vs R594C AMFR; K27 ubiquitination assay; ImageStream STING trafficking assay; IFN-β reporter gene assay; lentiviral reconstitution in patient PBMCs; VZV replication assay","journal":"Journal of clinical immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — patient variant functional characterization with multiple orthogonal assays (ubiquitination, trafficking, reporter, reconstitution); single case study","pmids":["38277122"],"is_preprint":false},{"year":2024,"finding":"AMFR catalyzes K48-linked polyubiquitination of Flavivirus NS2A at K56, and ubiquitinated NS2A binds FAM134B (ER-phagy receptor), with AMFR then orchestrating degradation of the NS2A-FAM134B complex. This AMFR-mediated ubiquitination of NS2A both suppresses ER-phagy and hinders the FAM134B-AMFR axis. A ZIKV K56R mutant lacking ubiquitination shows attenuated pathogenesis.","method":"Co-immunoprecipitation; ubiquitination assays (K48 linkage, K56 site mutagenesis); recombinant ZIKV-NS2AK56R; human brain organoids; mouse infection models","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — ubiquitination site mapping, viral mutant, organoid, and in vivo mouse models; multiple orthogonal methods in one rigorous study","pmids":["39505910"],"is_preprint":false},{"year":2024,"finding":"AMFR mediates ubiquitination and proteasomal degradation of PDL1 in hepatocellular carcinoma. Cholesterol suppresses AMFR-mediated PDL1 ubiquitination through the cholesterol/p38 MAPK axis, stabilizing PDL1. Statin-mediated cholesterol reduction restores AMFR-dependent PDL1 degradation and improves PD1 inhibition efficacy in vivo.","method":"Co-immunoprecipitation; ubiquitination assays; cholesterol manipulation; p38 MAPK pathway analysis; xenograft tumor model","journal":"Molecular and cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, ubiquitination, pharmacological manipulation, and in vivo model; single lab","pmids":["39231894"],"is_preprint":false},{"year":1997,"finding":"AMFR (gp78) localizes to a distinct smooth ER subdomain called the AMF-R tubule, which is fenestrated, ilimaquinone-sensitive, microtubule-associated, and continuous with rough ER cisternae but distinct from Golgi and ERGIC. This smooth ER subdomain can be selectively disrupted by ilimaquinone and nocodazole.","method":"Immunofluorescence microscopy; confocal microscopy; electron microscopy; ilimaquinone and nocodazole treatment; ERGIC-53 co-localization","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple imaging modalities establishing subcellular localization to a defined ER subdomain; single lab","pmids":["9365274"],"is_preprint":false},{"year":2022,"finding":"AMFR catalyzes K27-linked (predominant) and K33-linked ubiquitination of FAM134B (ER-phagy receptor), enhancing ER-phagy flux. This AMFR-driven ER-phagy suppresses cardiac fibroblast activation post-MI by inhibiting phosphorylation of mTORC1 downstream targets S6K1 and 4E-BP.","method":"AMFR knockout mice; AMFR overexpression in cardiac fibroblasts; ubiquitination assays (K27/K33 linkage); scRNA-seq; mTORC1 pathway assays; ER-phagy flux measurement","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo KO mouse, ubiquitination linkage assays, pathway validation; single lab","pmids":["40673870"],"is_preprint":false}],"current_model":"AMFR/gp78 is an ER-resident, multi-spanning membrane E3 ubiquitin ligase (RING-H2 type) that nucleates a degradation complex by recruiting the E2 Ube2g2 via an allosteric G2BR domain, binding p97/VCP via a VIM motif, and using its CUE domain for ubiquitin chain elongation; it mediates ERAD of diverse substrates (HMGCR, Insig-1, KAI1/CD82, CFTRΔf508, SOD1, ataxin-3, MAVS, and others), promotes Parkin-independent mitophagy by ubiquitinating mitofusins Mfn1/Mfn2, regulates innate immune signaling by catalyzing K27-linked polyubiquitination of STING (facilitating TBK1 recruitment), TAB3, and CIS, and is itself regulated by p38 MAPK phosphorylation at S538, MGRN1-mediated K11-linked trans-ubiquitination, CDK5-mediated phosphodegron at S516, and deubiquitylation by USP13 and USP34."},"narrative":{"mechanistic_narrative":"AMFR (gp78) is an ER membrane-embedded RING-H2 E3 ubiquitin ligase that nucleates a multidomain degradation machine and serves as a central hub for ER-associated degradation (ERAD), mitochondrial quality control, and innate immune signaling [PMID:11724934, PMID:16407162]. Catalytically, gp78 requires three cooperating elements: a RING finger, a ubiquitin-binding CUE domain, and a G2BR site that binds the E2 Ube2g2 at a region distinct from the RING; loss of any one abolishes ubiquitylation and substrate degradation [PMID:16407162]. G2BR binding drives an allosteric, ~50-fold increase in E2-RING affinity and primes Ube2g2 through redistribution of its conformational states, while the G2BR and CUE domains together extend polyubiquitin chains from the distal end in cis [PMID:19560420, PMID:25409783, PMID:28434917]. gp78 couples ubiquitination to extraction by binding p97/VCP through a VIM motif that docks the ND1 domain and recruits p97 to the ER for retrotranslocation, with Ufd1 acting as a cofactor that enhances ligase activity [PMID:16987818, PMID:15331598, PMID:17681147]. Through this machinery gp78 executes sterol-regulated degradation of HMG-CoA reductase and Insig-1 — bridged by Insig-1 and operating in parallel with the ligases Trc8 and RNF145 — and degrades substrates including CD3-delta, CFTRΔf508, and KAI1/CD82, the last linking gp78 to metastasis and proliferation control [PMID:16168377, PMID:17043353, PMID:22143767, PMID:30543180, PMID:18037895, PMID:20089858]. For some substrates gp78 acts as an E4-like factor downstream of an initiating E3, recognizing pre-conjugated ubiquitin via its CUE domain and operating in a post-retrotranslocation step in cooperation with the BAG6 complex [PMID:18216283, PMID:26424800]. Beyond ERAD, gp78 ubiquitinates mitofusins Mfn1/Mfn2 to drive mitochondrial fission and Parkin-independent mitophagy [PMID:23427266], and it regulates innate immunity by catalyzing linkage-specific ubiquitination of signaling proteins — K27-linked ubiquitination of STING to recruit TBK1, K27-linked modification of TAB3 to activate TAK1/NF-κB, K48-linked ubiquitination of CIS, and mixed-linkage modification of NLRP3 to restrain inflammasome activation [PMID:25526307, PMID:36593296, PMID:35333296, PMID:35110683]. gp78 activity is tuned by phosphorylation (p38 at S538, CDK5 at S516) and by trans-ubiquitination from MGRN1, Hrd1, and TRIM25 [PMID:26337390, PMID:28528366, PMID:26743086, PMID:19835843, PMID:24810856]. Bi-allelic truncating AMFR variants cause autosomal recessive hereditary spastic paraplegia through disrupted lipid homeostasis and lipid droplet accumulation [PMID:37119330].","teleology":[{"year":1997,"claim":"Before its enzymatic role was known, gp78 was placed in a defined ER subdomain, establishing the membrane platform on which its later degradation functions operate.","evidence":"Immunofluorescence, confocal and electron microscopy with ilimaquinone/nocodazole in mammalian cells defining the smooth-ER 'AMF-R tubule'","pmids":["9365274"],"confidence":"Medium","gaps":["Did not define molecular function","Relationship of this subdomain to ERAD machinery not established"]},{"year":2001,"claim":"Established that gp78 is an intrinsic ER-membrane RING-finger E3 ligase that recruits a specific E2 and degrades an ERAD substrate, defining its core catalytic identity.","evidence":"Overexpression and dominant-negative RING mutants, ubiquitination and CD3-delta degradation assays in mammalian cells","pmids":["11724934"],"confidence":"High","gaps":["E2 recruitment site distinct from RING not yet mapped","Full substrate range unknown","Coupling to extraction machinery unaddressed"]},{"year":2004,"claim":"Showed how ubiquitination is coupled to substrate extraction by demonstrating a dedicated p97/VCP-interacting domain required for retrotranslocation and degradation.","evidence":"Co-IP, domain deletion, RNAi and CD3-delta degradation assays","pmids":["15331598"],"confidence":"High","gaps":["Precise motif mediating p97 binding not yet identified","Cofactor requirements unresolved"]},{"year":2006,"claim":"Defined the three-domain architecture (RING, CUE, G2BR) required for catalysis and identified the VIM motif that directly docks the p97 ND1 domain, resolving the molecular logic of the gp78 degradation module.","evidence":"Systematic domain mutagenesis, ubiquitination and glycosylation/degradation assays, Co-IP and RNAi of Ufd1/p97","pmids":["16407162","16987818"],"confidence":"High","gaps":["Mechanism by which CUE and G2BR cooperate not yet resolved","Generality across substrates untested"]},{"year":2006,"claim":"Placed gp78 at the heart of sterol-regulated lipid metabolism by showing it degrades HMGCR and Insig-1 via Insig-1 bridging, linking ERAD to cholesterol homeostasis.","evidence":"Co-IP, RNAi, sterol-regulated ubiquitination and pulse-chase assays","pmids":["16168377","17043353"],"confidence":"High","gaps":["Redundancy with other HMGCR ligases not yet assessed","Quantitative contribution to flux unclear"]},{"year":2007,"claim":"Refined the extraction step by showing Ufd1 directly binds gp78 and uses distinct mono- and poly-ubiquitin sites to enhance ubiquitination and a post-ubiquitination step, and extended gp78's substrate range to the metastasis suppressor KAI1.","evidence":"Co-IP, domain mutagenesis, in vitro/in vivo ubiquitination, pulse-chase, RING mutant and in vivo metastasis assays","pmids":["17681147","18037895"],"confidence":"High","gaps":["In vivo physiological significance of Ufd1 cofactor role limited to assays","KAI1 degradation mechanism in tumors not fully defined"]},{"year":2008,"claim":"Revealed that gp78 can act as an E4-like elongation factor downstream of an initiating E3, recognizing pre-conjugated monoubiquitin through its CUE domain.","evidence":"Domain swapping, in vitro polyubiquitylation, RMA1 knockdown epistasis and Co-IP using CFTRΔf508","pmids":["18216283"],"confidence":"High","gaps":["Which substrates use E3 vs E4 mode not generalized","Structural basis of CUE chain recognition unresolved"]},{"year":2009,"claim":"Provided the structural and mechanistic basis for E2 activation, showing G2BR allosterically primes Ube2g2 and dramatically boosts RING affinity.","evidence":"NMR structure, SPR, in vitro ubiquitylation and mutagenesis","pmids":["19560420"],"confidence":"High","gaps":["Dynamics of the allosteric transition not yet captured","In-cell relevance of affinity gain untested"]},{"year":2009,"claim":"Expanded gp78's role into neurodegeneration-associated proteostasis and revealed cross-regulation among ER ligases and engagement of toxin retrotranslocation.","evidence":"Co-IP, overexpression/knockdown, aggregation assays (SOD1, ataxin-3); Hrd1-null MEFs; cholera toxin/PDI binding and retro-translocation assays","pmids":["19661182","19835843","19864457"],"confidence":"Medium","gaps":["Single-lab functional studies","Hierarchy of Hrd1/gp78/Derlin-1 not fully resolved","Non-ubiquitination roles partly undefined"]},{"year":2011,"claim":"Mapped the multi-ligase, multi-cofactor network controlling sterol-accelerated HMGCR degradation and identified the SPFH2-TMUB1 scaffold supporting gp78 function.","evidence":"Single and combined RNAi of gp78/Trc8, Co-IP and sterol-induced ubiquitination/degradation assays","pmids":["22143767","21343306"],"confidence":"Medium","gaps":["Compensation mechanisms among ligases not mechanistically explained","Stoichiometry of SPFH2-TMUB1-gp78 complex unknown"]},{"year":2013,"claim":"Established a non-ERAD role for gp78 in mitochondrial dynamics and quality control, degrading mitofusins to drive Parkin-independent mitophagy, with AMF endocytosis as an upstream modulator.","evidence":"WT vs RING-mutant overexpression, CCCP depolarization, Atg5/Parkin/Mfn siRNA, LC3 marker; pharmacological/genetic dissection of AMF uptake and Rac1","pmids":["23427266","23690547"],"confidence":"High","gaps":["How a single ligase coordinates ERAD vs mitophagy spatially unresolved","Physiological mitophagy contexts in vivo limited"]},{"year":2013,"claim":"Opened the immune-regulatory dimension by showing gp78 at the ER-mitochondria interface controls MAVS and RLR antiviral signaling via both ERAD and ERAD-independent mechanisms.","evidence":"Co-IP domain mapping, mutant constructs, RNAi, IFN reporter and VSV infection assays","pmids":["24285545"],"confidence":"Medium","gaps":["Single lab","Relative contribution of degradative vs non-degradative arms unquantified"]},{"year":2014,"claim":"Defined gp78 substrate-specificity safeguards and chain-elongation chemistry — DUB-mediated protection of machinery, additional substrates, and distal-end chain extension via cooperative G2BR/CUE action.","evidence":"Co-IP, in vitro chain assembly and polyubiquitylation, site/domain mutagenesis (Ubl4A/USP13, HERP, HSPA5, AMF/TRIM25)","pmids":["24424410","24496447","26119938","24810856","25409783"],"confidence":"Medium","gaps":["Each substrate validated largely in single labs","In vivo relevance of machinery-protective USP13 axis limited"]},{"year":2014,"claim":"Defined a linkage-specific signaling output by showing the AMFR-INSIG1 complex catalyzes K27-linked STING ubiquitination to recruit TBK1, establishing gp78 as a positive regulator of cytosolic-DNA antiviral immunity.","evidence":"Co-IP, ubiquitination site mapping, RNAi, Insig1 myeloid-specific knockout mice and HSV-1 infection","pmids":["25526307"],"confidence":"High","gaps":["Structural basis of K27 specificity unknown","How INSIG1 redirects gp78 to immune substrates unclear"]},{"year":2015,"claim":"Clarified gp78's position in the ERAD pathway hierarchy (downstream of Hrd1, post-retrotranslocation with BAG6) and identified p38-mediated S538 phosphorylation as a switch limiting mitofusin degradation.","evidence":"shRNA/CRISPR, retrotranslocation and ubiquitination assays; MS phosphosite mapping, phosphomimetic mutants, p38 inhibitor and morphology imaging","pmids":["26424800","26337390"],"confidence":"Medium","gaps":["Single-lab epistasis","How S538 phosphorylation alters substrate engagement without affecting in vitro activity unresolved"]},{"year":2016,"claim":"Showed gp78 abundance is gated by trans-ubiquitination, with MGRN1 using K11-linked chains and cytosolic Ca2+ relieving this brake to license mitophagy.","evidence":"Co-IP, K11 linkage-specific ubiquitination, Ca2+ chelation and MGRN1 catalytic mutants","pmids":["26743086"],"confidence":"Medium","gaps":["Single lab","How Ca2+ disrupts MGRN1-gp78 interaction mechanistically unknown"]},{"year":2017,"claim":"Detailed the dynamic energy landscape of E2 activation and a CDK5 phosphodegron at S516 that destabilizes gp78 with neuroprotective consequences.","evidence":"NMR conformational dynamics with mutagenesis/ubiquitylation; in vitro kinase assay, S516 mutants, MPTP/MPP+ Parkinson's models","pmids":["28434917","28528366"],"confidence":"Medium","gaps":["Allosteric model is structural/in vitro","S516 phosphodegron in vivo relevance limited to disease models in single lab"]},{"year":2018,"claim":"Through unbiased genome-wide screening, defined the redundant ligase network (RNF145, gp78, Hrd1) governing HMGCR degradation and sterol responsiveness.","evidence":"Genome-wide CRISPR screens, endogenous HMGCR reporter, siRNA and ubiquitination/sterol assays","pmids":["30543180"],"confidence":"High","gaps":["Division of labor among the three ligases under physiological sterol flux not fully quantified"]},{"year":2021,"claim":"Established AMFR as a cell-surface receptor (for CCL1) coupling ligand binding to Spry1 ubiquitination and Ras-ERK-driven fibrosis, broadening its activity beyond intracellular degradation.","evidence":"MS of CCL1 complexes, fibroblast AMFR deletion, ubiquitination and Ras-ERK assays, pulmonary fibrosis mouse models","pmids":["34407391"],"confidence":"High","gaps":["Reconciliation of receptor role with ER-membrane topology unaddressed","Direct vs adaptor-mediated CCL1 binding unclear"]},{"year":2022,"claim":"Expanded linkage-specific immune and transporter regulation: K48 ubiquitination of CIS promoting STAT5/GM-CSF, mixed-linkage NLRP3 ubiquitination restraining inflammasome, and non-degradative K542 ubiquitination promoting EAAT2 oligomerization; plus a K27/K33 ER-phagy axis on FAM134B.","evidence":"Co-IP, linkage-specific ubiquitination, conditional/knockout mice, signaling and oligomer assays, ER-phagy flux and disease models","pmids":["35333296","35110683","35938532","40673870"],"confidence":"High","gaps":["How AMFR selects K48 vs mixed vs non-degradative linkages on different substrates unresolved","Some readouts single-lab"]},{"year":2023,"claim":"Connected AMFR to human Mendelian disease and infection-driven inflammation: bi-allelic truncating variants cause hereditary spastic paraplegia via lipid dysregulation, and AMFR drives TAB3 K27 ubiquitination/TAK1-NF-κB during S. aureus infection.","evidence":"Patient WGS, patient fibroblasts/neural stem cells with rescue, amfra zebrafish and statin treatment; CRISPR screen, Co-IP, K27/K649 ubiquitination, pneumonia models","pmids":["37119330","36593296"],"confidence":"Medium","gaps":["HSP mechanism linking lipid droplet accumulation to neurodegeneration incompletely defined","Single disease publication"]},{"year":2024,"claim":"Extended AMFR's antiviral and immunometabolic roles: a patient STING-pathway variant (R594C) impairs K27-STING ubiquitination/trafficking, AMFR K48-ubiquitinates flaviviral NS2A to suppress ER-phagy, and cholesterol/p38 control AMFR-mediated PDL1 degradation in cancer.","evidence":"WT vs variant ubiquitination/trafficking/reporter and reconstitution; viral mutant, organoid and mouse infection models; Co-IP, cholesterol manipulation and xenografts","pmids":["38277122","39505910","39231894"],"confidence":"Medium","gaps":["Single case study for R594C","p38/cholesterol regulation of substrate choice mechanistically incomplete"]},{"year":null,"claim":"It remains unresolved how a single ER-membrane ligase achieves its diverse linkage-specific outputs (K11/K27/K33/K48/mixed) and partitions among ERAD, mitophagy, ER-phagy, receptor signaling, and surface-receptor functions across cell types.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model explains linkage-type selection","Spatial/temporal control distinguishing competing functions unknown","Mechanism enabling extracellular ligand reception by an ER-resident ligase undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016874","term_label":"ligase activity","supporting_discovery_ids":[0,3,7,18,21]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,3,8,26]},{"term_id":"GO:0031386","term_label":"protein tag activity","supporting_discovery_ids":[21,34,35,37,41]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[9,30]},{"term_id":"GO:0001618","term_label":"virus receptor activity","supporting_discovery_ids":[33]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[0,4,43]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[18,19,28]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[33]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,2,3,6]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[1,5,15,32]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[21,34,35,37]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[18,41,44]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[19,33,35]}],"complexes":["gp78-Insig-1 E3 complex","gp78-SPFH2-TMUB1 complex","gp78-p97/VCP-Ufd1 retrotranslocation module"],"partners":["UBE2G2","VCP","INSIG1","UFD1","STING1","TAB3","MFN1","FAM134B"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9UKV5","full_name":"E3 ubiquitin-protein ligase AMFR","aliases":["Autocrine motility factor receptor","AMF receptor","RING finger protein 45","gp78"],"length_aa":643,"mass_kda":73.0,"function":"E3 ubiquitin-protein ligase that mediates the polyubiquitination of lysine and cysteine residues on target proteins, such as CD3D, CYP3A4, CFTR, INSIG1, SOAT2/ACAT2 and APOB for proteasomal degradation (PubMed:10456327, PubMed:11724934, PubMed:12670940, PubMed:19103148, PubMed:24424410, PubMed:28604676). Component of a VCP/p97-AMFR/gp78 complex that participates in the final step of endoplasmic reticulum-associated degradation (ERAD) (PubMed:10456327, PubMed:11724934, PubMed:19103148, PubMed:24424410). The VCP/p97-AMFR/gp78 complex is involved in the sterol-accelerated ERAD degradation of HMGCR through binding to the HMGCR-INSIG1 complex at the ER membrane (PubMed:16168377, PubMed:22143767). In addition, interaction of AMFR with AUP1 facilitates interaction of AMFR with ubiquitin-conjugating enzyme UBE2G2 and ubiquitin ligase RNF139, leading to sterol-induced HMGCR ubiquitination (PubMed:23223569). The ubiquitinated HMGCR is then released from the ER into the cytosol for subsequent destruction (PubMed:16168377, PubMed:22143767, PubMed:23223569). In addition to ubiquitination on lysine residues, catalyzes ubiquitination on cysteine residues: together with INSIG1, mediates polyubiquitination of SOAT2/ACAT2 at 'Cys-277', leading to its degradation when the lipid levels are low (PubMed:28604676). Catalyzes ubiquitination and subsequent degradation of INSIG1 when cells are depleted of sterols (PubMed:17043353). Mediates polyubiquitination of INSIG2 at 'Cys-215' in some tissues, leading to its degradation (PubMed:31953408). Also regulates ERAD through the ubiquitination of UBL4A a component of the BAG6/BAT3 complex (PubMed:21636303). Also acts as a scaffold protein to assemble a complex that couples ubiquitination, retranslocation and deglycosylation (PubMed:21636303). Mediates tumor invasion and metastasis as a receptor for the GPI/autocrine motility factor (PubMed:10456327). In association with LMBR1L and UBAC2, negatively regulates the canonical Wnt signaling pathway in the lymphocytes by promoting the ubiquitin-mediated degradation of CTNNB1 and Wnt receptors FZD6 and LRP6 (PubMed:31073040). Regulates NF-kappa-B and MAPK signaling pathways by mediating 'Lys-27'-linked polyubiquitination of TAB3 and promoting subsequent TAK1/MAP3K7 activation (PubMed:36593296). Required for proper lipid homeostasis (PubMed:37119330)","subcellular_location":"Endoplasmic reticulum membrane","url":"https://www.uniprot.org/uniprotkb/Q9UKV5/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/AMFR","classification":"Not Classified","n_dependent_lines":73,"n_total_lines":1208,"dependency_fraction":0.060430463576158944},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CCDC47","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/AMFR","total_profiled":1310},"omim":[{"mim_id":"620965","title":"SMALL VCP-INTERACTING PROTEIN; SVIP","url":"https://www.omim.org/entry/620965"},{"mim_id":"620640","title":"RING FINGER PROTEIN 145; RNF145","url":"https://www.omim.org/entry/620640"},{"mim_id":"620379","title":"SPASTIC PARAPLEGIA 89, AUTOSOMAL RECESSIVE; SPG89","url":"https://www.omim.org/entry/620379"},{"mim_id":"610236","title":"LUNAPARK; LNPK","url":"https://www.omim.org/entry/610236"},{"mim_id":"603243","title":"AUTOCRINE MOTILITY FACTOR RECEPTOR; AMFR","url":"https://www.omim.org/entry/603243"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Endoplasmic reticulum","reliability":"Supported"},{"location":"Golgi apparatus","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/AMFR"},"hgnc":{"alias_symbol":["RNF45","gp78"],"prev_symbol":[]},"alphafold":{"accession":"Q9UKV5","domains":[{"cath_id":"3.30.40.10","chopping":"326-382","consensus_level":"high","plddt":81.8968,"start":326,"end":382},{"cath_id":"1.10.8.10","chopping":"457-494","consensus_level":"high","plddt":85.9829,"start":457,"end":494}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UKV5","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UKV5-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UKV5-F1-predicted_aligned_error_v6.png","plddt_mean":72.75},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=AMFR","jax_strain_url":"https://www.jax.org/strain/search?query=AMFR"},"sequence":{"accession":"Q9UKV5","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9UKV5.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9UKV5/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UKV5"}},"corpus_meta":[{"pmid":"11724934","id":"PMC_11724934","title":"The tumor autocrine motility factor receptor, gp78, is a ubiquitin protein ligase implicated in degradation from the endoplasmic reticulum.","date":"2001","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/11724934","citation_count":366,"is_preprint":false},{"pmid":"16168377","id":"PMC_16168377","title":"Gp78, a membrane-anchored ubiquitin ligase, associates with Insig-1 and couples sterol-regulated ubiquitination to degradation of HMG CoA reductase.","date":"2005","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/16168377","citation_count":314,"is_preprint":false},{"pmid":"25526307","id":"PMC_25526307","title":"The E3 ubiquitin ligase AMFR and INSIG1 bridge the activation of TBK1 kinase by modifying the adaptor STING.","date":"2014","source":"Immunity","url":"https://pubmed.ncbi.nlm.nih.gov/25526307","citation_count":312,"is_preprint":false},{"pmid":"18216283","id":"PMC_18216283","title":"Gp78 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pathology","url":"https://pubmed.ncbi.nlm.nih.gov/39787898","citation_count":1,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":51318,"output_tokens":11689,"usd":0.164644,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":22366,"output_tokens":7312,"usd":0.147315,"stage2_stop_reason":"end_turn"},"total_usd":0.311959,"stage1_batch_id":"msgbatch_0179Z2pxRYBsXi2xADneafRw","stage2_batch_id":"msgbatch_01LaY9ZaVdgjWArcZo9eqQE5","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2001,\n      \"finding\": \"gp78/AMFR is a RING finger-dependent E3 ubiquitin ligase intrinsic to the ER membrane. It recruits the E2 enzyme MmUBC7 through a region distinct from the RING finger, can auto-ubiquitinate itself for proteasomal degradation, and mediates degradation of the ERAD substrate CD3-delta in a RING finger- and MmUBC7-dependent manner.\",\n      \"method\": \"Overexpression and dominant-negative (RING finger mutant) constructs in mammalian cells; ubiquitination assays; CD3-delta degradation assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — foundational study with multiple orthogonal functional assays (ubiquitination, degradation, dominant-negative mutagenesis) in mammalian cells, subsequently replicated across many independent labs\",\n      \"pmids\": [\"11724934\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"gp78 associates with Insig-1 (but not Insig-2) and is required for sterol-regulated ubiquitination and degradation of HMG-CoA reductase (HMGCR). gp78 couples regulated ubiquitination to degradation by also binding VCP/p97, with Insig-1 serving as a bridge between gp78/VCP and the reductase substrate.\",\n      \"method\": \"Co-immunoprecipitation; RNAi knockdown of gp78; sterol-regulated ubiquitination and pulse-chase degradation assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, RNAi, ubiquitination assays; replicated and extended by multiple independent groups\",\n      \"pmids\": [\"16168377\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"gp78 physically interacts with p97/VCP and enhances p97/VCP-polyubiquitin association, facilitating retrotranslocation of ubiquitinated ERAD substrates. A specific p97/VCP-interacting domain on gp78 is required; its deletion prevents CD3-delta degradation and causes accumulation of polyubiquitinated CD3-delta.\",\n      \"method\": \"Co-immunoprecipitation; domain deletion analysis; RNAi knockdown; CD3-delta degradation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, deletion mapping, RNAi, and functional substrate degradation assay; replicated by other labs\",\n      \"pmids\": [\"15331598\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Efficient gp78-mediated ERAD requires three functional domains: the RING finger, a ubiquitin-binding CUE domain, and a specific Ube2g2-binding site (G2BR) distinct from the RING finger. Disruption of any one of these domains abolishes gp78-mediated ubiquitylation and protein degradation, with substrates accumulating in their fully glycosylated ER-resident forms.\",\n      \"method\": \"Domain mutagenesis; in vivo ubiquitination assays; glycosylation analysis as ERAD readout\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — systematic mutagenesis of multiple domains combined with functional ubiquitination and degradation assays, replicated in follow-up structural studies\",\n      \"pmids\": [\"16407162\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"gp78 contains a novel VIM (VCP-interacting motif) that mediates direct interaction with the ND1 domain of p97/VCP, recruits p97/VCP to the ER, and is required for gp78-mediated substrate degradation. Inhibition of p97/VCP (but not Ufd1 alone at high gp78 overexpression levels) stabilizes CD3-delta, suggesting gp78 can operate in a Ufd1-independent pathway in parallel with the canonical VCP-Ufd1-Npl4 mechanism.\",\n      \"method\": \"Domain deletion and mutation; co-immunoprecipitation; RNAi of Ufd1 and p97/VCP; CD3-delta degradation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple domain constructs, RNAi, and functional substrate assays; mechanistically detailed with pathway context\",\n      \"pmids\": [\"16987818\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"gp78 mediates sterol-regulated degradation of Insig-1 (but not Insig-2) in sterol-depleted cells. Sterols prevent Insig-1 ubiquitination by displacing gp78 from Insig-1 through sterol-induced binding of Scap to Insig-1, explaining ER retention of Scap while reductase is ubiquitinated.\",\n      \"method\": \"Co-immunoprecipitation; RNAi knockdown of gp78; ubiquitination assays; pulse-chase protein stability assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple methods (Co-IP, RNAi, ubiquitination, pulse-chase) in a single rigorous study; replicated by independent groups\",\n      \"pmids\": [\"17043353\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Ufd1 directly interacts with gp78 and functions as a cofactor that enhances gp78 E3 activity. The monoubiquitin-binding site in Ufd1 is required for enhancement of gp78 ubiquitination activity, while the polyubiquitin-binding site is critical for a post-ubiquitination step in ERAD. Ufd1 accelerates ubiquitination and degradation of HMG-CoA reductase.\",\n      \"method\": \"Co-immunoprecipitation; domain mutagenesis; in vitro and in vivo ubiquitination assays; pulse-chase degradation assays\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — direct binding, mutagenesis of Ufd1 binding domains, in vitro and in vivo ubiquitination assays in a rigorous single study\",\n      \"pmids\": [\"17681147\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"gp78 associates with and ubiquitinates the transmembrane metastasis suppressor KAI1 (CD82), targeting it for proteasomal degradation. This prometastatic activity requires the E3 ligase activity of gp78. Suppression of gp78 increases KAI1 abundance and reduces metastatic potential.\",\n      \"method\": \"Co-immunoprecipitation; RNAi knockdown; in vivo metastasis assays; RING finger mutant; tissue microarray\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, RING mutant, RNAi rescue, and in vivo metastasis assays; mechanistically validated\",\n      \"pmids\": [\"18037895\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"gp78 participates in ERAD of CFTRΔf508 by recognizing monoubiquitin already conjugated to CFTRΔf508 via its CUE domain and catalyzing further polyubiquitylation in an E4-like manner. RMA1 functions as the upstream E3 and gp78 acts downstream as an E4-like polyubiquitylation factor.\",\n      \"method\": \"Domain swapping/deletion analysis; in vitro polyubiquitylation assay; siRNA knockdown of RMA1; co-immunoprecipitation\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro polyubiquitylation assay with domain deletion plus RNAi epistasis in a single rigorous study\",\n      \"pmids\": [\"18216283\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The G2BR domain of gp78 binds selectively and with high affinity to the E2 Ube2g2 at a region distinct from E1- and RING-binding sites. This binding causes conformational changes in Ube2g2 affecting ubiquitin loading and produces an ~50-fold increase in E2-RING affinity, markedly increasing ubiquitylation via an allosteric mechanism.\",\n      \"method\": \"NMR structural analysis; surface plasmon resonance; in vitro ubiquitylation assays; mutagenesis\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — NMR structure combined with mutagenesis and quantitative binding/activity assays; allosteric mechanism confirmed\",\n      \"pmids\": [\"19560420\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"gp78 promotes ubiquitination and proteasomal degradation of SOD1 and ataxin-3. gp78 interacts with both proteins; overexpression promotes their ubiquitination and degradation while knockdown stabilizes them. gp78 also suppresses aggregate formation of mutant SOD1 and protects cells from mutant SOD1-induced death.\",\n      \"method\": \"Co-immunoprecipitation; overexpression and siRNA knockdown; ubiquitination assays; aggregation assays\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — Co-IP and functional overexpression/knockdown in a single lab study\",\n      \"pmids\": [\"19661182\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Both Hrd1 and gp78 bind cholera toxin (CTA1 subunit) and protein disulfide isomerase (PDI), and expression of dominant-negative forms of Hrd1 and gp78 or dominant-negative Ube2g2 decreases CTA1 retro-translocation. CT association with Hrd1/gp78 is blocked by dominant-negative Derlin-1, suggesting sequential engagement: CT → Derlin-1 → Hrd1/gp78.\",\n      \"method\": \"Dominant-negative constructs; pulldown/binding studies; retro-translocation assays; RNAi knockdown\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — binding assays with epistasis experiments, but role is partially non-ubiquitination-based and mechanism not fully resolved\",\n      \"pmids\": [\"19864457\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Hrd1 targets gp78 for proteasomal degradation in a manner independent of gp78's own ubiquitin ligase activity, establishing cross-regulation between the two ER E3 ligases. Reduced Hrd1 increases gp78 levels, which in turn decreases the gp78 substrate Insig-1.\",\n      \"method\": \"Mouse embryonic fibroblasts lacking Hrd1; siRNA knockdown; protein stability assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MEF genetic model and acute siRNA manipulation, two orthogonal loss-of-function approaches, single lab\",\n      \"pmids\": [\"19835843\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Mutant huntingtin interacts with gp78 via its HEAT repeats 2&3 binding to the CUE domain of gp78, competitively reducing polyubiquitinated protein binding to gp78 and sterically blocking gp78-p97/VCP interaction, thereby impairing ERAD and inducing ER stress. Polyglutamine expansion aggravates this inhibitory effect.\",\n      \"method\": \"Co-immunoprecipitation; domain mapping; competitive binding assays; ER stress markers\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — domain mapping Co-IP with competitive binding; single lab with multiple constructs\",\n      \"pmids\": [\"20126661\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"gp78 promotes cell proliferation and mammary gland hyperplasia by targeting the metastasis suppressor KAI1 for ERAD. Stable knockdown of gp78 in HEK293 cells increases KAI1 expression and reduces proliferation, an effect rescued by concomitant KAI1 knockdown, placing KAI1 downstream of gp78 in proliferation control.\",\n      \"method\": \"MMTV-gp78 transgenic mice; stable knockdown; KAI1 co-knockdown rescue; BrdU proliferation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — transgenic mouse plus rescue epistasis experiment; single lab\",\n      \"pmids\": [\"20089858\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Sterol-accelerated HMGCR degradation requires interplay of two Insigs and two ubiquitin ligases: gp78 (recruits Insig-1) and Trc8 (recruits both Insig-1 and Insig-2). Combined RNAi knockdown of gp78 and Trc8 produces >90% inhibition of sterol-induced reductase degradation; gp78 knockdown leads to compensatory increases in Trc8 and Insig-1.\",\n      \"method\": \"siRNA knockdown (single and combined); sterol-induced ubiquitination and degradation assays; protein level analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis by combined RNAi of two ligases with quantitative ubiquitination assays; independent follow-up of prior findings\",\n      \"pmids\": [\"22143767\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"gp78 forms a complex with two ER membrane proteins, SPFH2 and TMUB1, where TMUB1 bridges SPFH2 to gp78. RNAi-mediated knockdown of SPFH2 and TMUB1 blunts sterol-induced ubiquitination and degradation of endogenous HMG-CoA reductase.\",\n      \"method\": \"Co-immunoprecipitation; RNAi knockdown; sterol-induced ubiquitination and degradation assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP identifying complex components combined with functional RNAi; single lab\",\n      \"pmids\": [\"21343306\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Gp78 RING finger cysteines undergo S-palmitoylation. Five palmitoyl acyltransferases increase gp78 RING finger palmitoylation. ER-localized DHHC6 overexpression promotes peripheral ER distribution of gp78, while RING finger mutation or palmitoylation inhibition restricts gp78 to the central ER, linking palmitoylation to gp78 subcellular distribution.\",\n      \"method\": \"Palmitoylation assay; PAT overexpression screen; immunofluorescence microscopy; RING finger mutagenesis\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — palmitoylation biochemistry with localization consequences, mutagenesis; single lab\",\n      \"pmids\": [\"22728137\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Gp78 overexpression (but not RING mutant) induces mitochondrial fragmentation and ubiquitination plus proteasome-dependent degradation of mitofusins Mfn1 and Mfn2. After mitochondrial depolarization, Gp78 induces mitophagy dependent on ubiquitin ligase activity and Mfn1 (but not Mfn2). Gp78-induced mitophagy is Parkin-independent.\",\n      \"method\": \"Overexpression of wild-type vs RING mutant Gp78; CCCP-induced depolarization; siRNA knockdown of Atg5, Parkin, Mfn1/2; LC3-GFP autophagy marker; OxPhos protein levels\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — RING mutant, multiple siRNA knockdowns, autophagy marker, mitophagy quantification; multiple orthogonal methods in one study\",\n      \"pmids\": [\"23427266\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Gp78, localized at the ER-mitochondria interface, regulates MAVS expression and RLR antiviral signaling via two parallel pathways: (1) E3 ubiquitin ligase/ERAD activity directly degrades MAVS; (2) Gp78 RING domain interacts with both N- and C-terminal domains of MAVS and attenuates RLR signaling independently of ERAD. Gp78 depletion enhances type I IFN signaling.\",\n      \"method\": \"Co-immunoprecipitation; Gp78 mutant constructs; RNAi knockdown; IFN reporter assays; VSV infection assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP domain mapping, multiple loss-of-function constructs, functional signaling assays; single lab\",\n      \"pmids\": [\"24285545\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"AMF endocytosis through a PI3K- and dynamin-dependent raft pathway requires Gp78 and stimulates Rac1 activation. AMF uptake inhibits Gp78-induced degradation of mitofusins 1 and 2, thereby preventing Gp78-dependent mitochondrial fission. Gp78 knockdown reduces both AMF-induced Rac1 activation and dynamin-dependent AMF internalization.\",\n      \"method\": \"Dynamin inhibitor; PI3K inhibitor; dominant-negative Rac1; Rac1 inhibitor; Gp78 knockdown; Mfn1/2 protein levels; mitochondrial morphology imaging\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple pharmacological and genetic inhibitors with functional readouts; single lab\",\n      \"pmids\": [\"23690547\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Upon cytoplasmic DNA stimulation, AMFR is recruited to STING in an INSIG1-dependent manner. The AMFR-INSIG1 E3 complex catalyzes K27-linked polyubiquitination of STING, which serves as a platform for recruiting TBK1 and facilitating TBK1 translocation to perinuclear microsomes. Depletion of AMFR or INSIG1 impairs STING-mediated antiviral gene induction.\",\n      \"method\": \"Co-immunoprecipitation; RNAi knockdown; ubiquitination assays; Insig1 knockout mice (myeloid-specific); HSV-1 infection model\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP, ubiquitination site mapping, in vivo knockout mouse model, and functional antiviral assays; replicated in follow-up papers\",\n      \"pmids\": [\"25526307\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"gp78 ubiquitinates not only ERAD substrates but also the machinery protein Ubl4A (component of the Bag6 chaperone complex), leading to irreversible proteolytic inactivation of Bag6. The DUB USP13 associates with gp78 and removes ubiquitin conjugates from Ubl4A to maintain Bag6 functionality and sharpen gp78 substrate specificity.\",\n      \"method\": \"Co-immunoprecipitation; ubiquitination assays; DUB identification; cell-based functional assays for Bag6/ERAD\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ubiquitination assays, functional Bag6 inactivation readout; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"24424410\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"After ER stress induction, HERP is rapidly degraded by Ube2g2-gp78-mediated ubiquitylation and proteasomal degradation during ER stress recovery. This requires physical interaction between the CUE domain of gp78 and the UBL domain of HERP, which is essential for HERP degradation in vivo.\",\n      \"method\": \"In vitro polyubiquitylation assay; domain interaction mapping; cell-based degradation assays; siRNA knockdown\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro ubiquitylation with domain mapping and in vivo functional assays; single lab\",\n      \"pmids\": [\"24496447\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"gp78 interacts with the C-terminal region of HSPA5/GRP78, mediates HSPA5 ubiquitination and degradation, specifically at K447. HDAC6-mediated deacetylation of HSPA5 at K353 promotes GP78 binding and ubiquitination; acetylation at K353 reduces GP78-mediated ubiquitination at K447.\",\n      \"method\": \"Co-immunoprecipitation; site-directed mutagenesis; ubiquitination assays; siRNA knockdown of GP78 and HDAC6\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, mutagenesis, and ubiquitination assays identifying specific lysine residues; single lab\",\n      \"pmids\": [\"26119938\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Polyubiquitylation of autocrine motility factor (AMF/PGI) requires cooperative interaction between gp78 and TRIM25: TRIM25 mediates initial ubiquitylation, then gp78 catalyzes polyubiquitylation in an E4-like manner. TRIM25 also ubiquitinates gp78 itself, modulating gp78 steady-state levels.\",\n      \"method\": \"In vitro polyubiquitylation assay with Ub-DHFR model substrate; co-immunoprecipitation; siRNA knockdown; protein stability assays\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro E4 assay, Co-IP, and functional degradation assays; single lab\",\n      \"pmids\": [\"24810856\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"gp78 extends polyubiquitin chains from the distal end through cooperative action of its G2BR and CUE domains: G2BR binds donor Ube2g2~Ub to promote ubiquitin transfer in cis, while the CUE domain binds the growing ubiquitin chain preferentially over monoubiquitin to position the distal ubiquitin correctly for chain elongation.\",\n      \"method\": \"In vitro polyubiquitin chain assembly assays; domain deletion/mutagenesis; binding assays\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro chain assembly with domain mutagenesis; single lab\",\n      \"pmids\": [\"25409783\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"gp78 acts downstream of Hrd1 in ERAD: Hrd1 is the essential retrotranslocation/ubiquitination module, while gp78 knockdown does not affect retrotranslocation or initial ubiquitination of ERAD substrates but promotes ERAD via cooperation with the BAG6 chaperone complex in a post-retrotranslocation step.\",\n      \"method\": \"shRNA knockdown; CRISPR-based genetic tools; biochemical retrotranslocation assays; ubiquitination assays; BAG6 co-functional studies\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR and shRNA with multiple substrate assays; single lab, but rigorous epistasis analysis\",\n      \"pmids\": [\"26424800\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"p38 MAP kinase phosphorylates gp78 at Ser-538 (S538) in a 14-3-3/WW-domain-containing region at the mitochondria-associated ER. S538 phosphorylation limits gp78-induced mitochondrial fission and Mfn1/Mfn2 degradation, and the phosphomimetic S538D mutation prevents gp78 promotion of ER-mitochondria interaction without affecting in vitro E3 ubiquitin ligase activity.\",\n      \"method\": \"Mass spectrometry phosphopeptide mapping; 3F3A antibody as phosphorylation reporter; phosphomimetic/phosphonull mutagenesis; p38 MAPK inhibitor (SB203580); mitochondrial morphology imaging; in vitro ubiquitin ligase assay\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — MS phosphosite identification, functional mutagenesis, and inhibitor studies; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"26337390\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MGRN1, a cytosolic E3 ligase, ubiquitylates GP78 in trans via non-canonical K11-linked polyubiquitination, maintaining constitutively low GP78 levels in healthy cells and suppressing mitophagy. Elevated cytosolic Ca2+ (from mitochondrial stress) reduces MGRN1-GP78 interaction and GP78 ubiquitylation, enabling GP78-mediated mitophagy.\",\n      \"method\": \"Co-immunoprecipitation; ubiquitination assays specifying K11 linkage; Ca2+ chelation experiments; MGRN1 catalytic mutants; protein stability assays\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, linkage-specific ubiquitination, Ca2+ manipulation, and catalytic mutant; single lab with multiple methods\",\n      \"pmids\": [\"26743086\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Conformational dynamics in Ube2g2 reveals that G2BR binding and RING binding of gp78 drive sequential progression toward ubiquitin transfer through redistribution of conformational populations. The G2BR-bound state of Ube2g2 shows allosteric changes that are prerequisite for RING-mediated activation, establishing a dynamic energy landscape model for E2 activation.\",\n      \"method\": \"NMR conformational dynamics analysis; NMR chemical shift perturbation; mutagenesis; in vitro ubiquitylation assays\",\n      \"journal\": \"Structure\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR structural dynamics with mutagenesis and functional assays; single rigorous study\",\n      \"pmids\": [\"28434917\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CDK5 directly phosphorylates GP78 at Ser516, promoting ubiquitination and degradation of GP78. GP78 overexpression or interference with Ser516 phosphorylation protects neurons against MPP+-induced cell death in Parkinson's disease models.\",\n      \"method\": \"In vitro kinase assay; site-directed mutagenesis (Ser516); GP78 overexpression and phosphomutants; MPTP/MPP+ cellular and animal models; ubiquitination assays\",\n      \"journal\": \"Molecular neurobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro kinase assay with mutagenesis and functional cell death assay; single lab\",\n      \"pmids\": [\"28528366\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"RNF145 and gp78 independently co-ordinate HMGCR ubiquitination and degradation. CRISPR genome-wide screens identify that in the absence of both RNF145 and gp78, a third UBE2G2-dependent E3 ligase Hrd1 partially regulates HMGCR. RNF145 is sterol-responsive, accumulates following sterol depletion, and is recruited to HMGCR via Insigs upon sterol addition.\",\n      \"method\": \"CRISPR/Cas9 genome-wide screens; endogenous HMGCR reporter; siRNA knockdown; ubiquitination assays; sterol regulation assays\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — unbiased genome-wide CRISPR screen combined with functional validation; orthogonal to prior studies\",\n      \"pmids\": [\"30543180\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CCL1 binds AMFR as a receptor on fibroblasts, triggering AMFR E3 ligase-mediated ubiquitination of the ERK inhibitor Spry1. This ubiquitination activates Ras-mediated profibrotic protein synthesis, driving fibroblast-to-myofibroblast differentiation and pulmonary fibrosis.\",\n      \"method\": \"Mass spectrometry of CCL1 complexes; AMFR deletion in fibroblasts; ubiquitination assays; Ras-ERK pathway activation assays; mouse models of pulmonary fibrosis\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — MS-based receptor identification, cell-specific knockout, ubiquitination assays, and in vivo fibrosis model; multiple orthogonal methods\",\n      \"pmids\": [\"34407391\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"gp78-Insig-1 E3 complex mediates mixed-linkage ubiquitination of NLRP3, inhibiting NLRP3 inflammasome activation by suppressing NLRP3 oligomerization and subcellular translocation. Insig-1 is required for gp78-NLRP3 interaction. gp78 or Insig-1 deficiency in myeloid cells exacerbates NLRP3-dependent inflammation in vivo.\",\n      \"method\": \"Co-immunoprecipitation; ubiquitination assays (linkage specificity); inflammasome activation assays (oligomerization, translocation); myeloid-specific knockout mice; LPS-induced inflammation and alum-induced peritonitis models\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP, ubiquitination assays with linkage characterization, in vivo knockout mouse models; multiple orthogonal methods\",\n      \"pmids\": [\"35110683\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"AMFR, following TSLP stimulation in alveolar macrophages, directly associates with CIS (cytokine-inducible SH2-containing protein) and catalyzes K48-linked polyubiquitination of CIS, blocking CIS inhibition of STAT5 phosphorylation and promoting downstream GM-CSF production that drives Th2/eosinophilic asthma inflammation.\",\n      \"method\": \"Co-immunoprecipitation; K48 linkage-specific ubiquitination assays; AMFR conditional knockout mice; STAT5 phosphorylation assays; GM-CSF ELISA; allergy models\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP, specific ubiquitination linkage, AMFR conditional KO mice, and signaling assays with in vivo disease models\",\n      \"pmids\": [\"35333296\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"AMFR mediates K542-specific ubiquitination of EAAT2 (excitatory amino acid transporter 2) that specifically promotes EAAT2 oligomer formation rather than degradation, increasing functional transporter levels. AMFR and EAAT2 oligomer levels are simultaneously decreased in hippocampus of epilepsy models.\",\n      \"method\": \"Co-immunoprecipitation; site-directed mutagenesis (K542); ubiquitination assays; oligomer detection; in vivo epilepsy mouse models; FDA drug screen\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, mutagenesis defining specific ubiquitination site, functional oligomerization assay; single lab\",\n      \"pmids\": [\"35938532\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"AMFR directly interacts with TAK1-binding protein 3 (TAB3) in the ER, inducing K27-linked polyubiquitination of TAB3 at K649, thereby promoting TAK1 activation and intracellular S. aureus-induced NF-κB-mediated inflammation. The S. aureus virulence factor HlgB binds AMFR and modulates this TAB3 signaling.\",\n      \"method\": \"Co-immunoprecipitation; CRISPR-Cas9 screen; ubiquitination assays (K27-linkage); site-directed mutagenesis (K649); TAK1 activation assays; pneumonia mouse models\",\n      \"journal\": \"Nature microbiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — CRISPR screen, Co-IP, K27 ubiquitination with mutagenesis, in vivo infection models; multiple rigorous methods\",\n      \"pmids\": [\"36593296\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Bi-allelic truncating variants in AMFR cause autosomal recessive hereditary spastic paraplegia. Loss of AMFR disturbs lipid homeostasis causing lipid droplet accumulation in neural stem cells and patient fibroblasts rescued by AMFR re-expression. In amfra-/- zebrafish, motor neuron branching defects and touch-evoked escape response abnormalities are observed, and statins improve these phenotypes.\",\n      \"method\": \"Patient whole genome sequencing; patient-derived fibroblasts and neural stem cells; AMFR re-expression rescue; electron microscopy (ER morphology); zebrafish amfra knockout; statin treatment\",\n      \"journal\": \"Acta neuropathologica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — patient cells, rescue experiments, and in vivo zebrafish model; novel disease mechanism but single publication\",\n      \"pmids\": [\"37119330\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"AMFR promotes proteasomal degradation of HMGCR in response to influenza virus infection and activates innate immunity components TBK1 and IRF3. AMFR knockdown inhibits HMGCR ubiquitination and inactivates TBK1/IRF3 signaling during influenza infection.\",\n      \"method\": \"siRNA knockdown of AMFR; ubiquitination assays; TBK1/IRF3 phosphorylation assays; influenza virus infection model\",\n      \"journal\": \"Virology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — siRNA with western blot readouts only; single lab, single study\",\n      \"pmids\": [\"37703797\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"AMFR variant R594C (patient-derived) results in decreased K27-linked STING ubiquitination and reduced STING trafficking from ER to Golgi compared to wild-type AMFR, impairing type I IFN responses and increasing VZV replication. Lentiviral transduction with wild-type AMFR partially reconstitutes STING-mediated signaling in patient PBMCs.\",\n      \"method\": \"Overexpression of WT vs R594C AMFR; K27 ubiquitination assay; ImageStream STING trafficking assay; IFN-β reporter gene assay; lentiviral reconstitution in patient PBMCs; VZV replication assay\",\n      \"journal\": \"Journal of clinical immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — patient variant functional characterization with multiple orthogonal assays (ubiquitination, trafficking, reporter, reconstitution); single case study\",\n      \"pmids\": [\"38277122\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"AMFR catalyzes K48-linked polyubiquitination of Flavivirus NS2A at K56, and ubiquitinated NS2A binds FAM134B (ER-phagy receptor), with AMFR then orchestrating degradation of the NS2A-FAM134B complex. This AMFR-mediated ubiquitination of NS2A both suppresses ER-phagy and hinders the FAM134B-AMFR axis. A ZIKV K56R mutant lacking ubiquitination shows attenuated pathogenesis.\",\n      \"method\": \"Co-immunoprecipitation; ubiquitination assays (K48 linkage, K56 site mutagenesis); recombinant ZIKV-NS2AK56R; human brain organoids; mouse infection models\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ubiquitination site mapping, viral mutant, organoid, and in vivo mouse models; multiple orthogonal methods in one rigorous study\",\n      \"pmids\": [\"39505910\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"AMFR mediates ubiquitination and proteasomal degradation of PDL1 in hepatocellular carcinoma. Cholesterol suppresses AMFR-mediated PDL1 ubiquitination through the cholesterol/p38 MAPK axis, stabilizing PDL1. Statin-mediated cholesterol reduction restores AMFR-dependent PDL1 degradation and improves PD1 inhibition efficacy in vivo.\",\n      \"method\": \"Co-immunoprecipitation; ubiquitination assays; cholesterol manipulation; p38 MAPK pathway analysis; xenograft tumor model\",\n      \"journal\": \"Molecular and cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ubiquitination, pharmacological manipulation, and in vivo model; single lab\",\n      \"pmids\": [\"39231894\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"AMFR (gp78) localizes to a distinct smooth ER subdomain called the AMF-R tubule, which is fenestrated, ilimaquinone-sensitive, microtubule-associated, and continuous with rough ER cisternae but distinct from Golgi and ERGIC. This smooth ER subdomain can be selectively disrupted by ilimaquinone and nocodazole.\",\n      \"method\": \"Immunofluorescence microscopy; confocal microscopy; electron microscopy; ilimaquinone and nocodazole treatment; ERGIC-53 co-localization\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple imaging modalities establishing subcellular localization to a defined ER subdomain; single lab\",\n      \"pmids\": [\"9365274\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"AMFR catalyzes K27-linked (predominant) and K33-linked ubiquitination of FAM134B (ER-phagy receptor), enhancing ER-phagy flux. This AMFR-driven ER-phagy suppresses cardiac fibroblast activation post-MI by inhibiting phosphorylation of mTORC1 downstream targets S6K1 and 4E-BP.\",\n      \"method\": \"AMFR knockout mice; AMFR overexpression in cardiac fibroblasts; ubiquitination assays (K27/K33 linkage); scRNA-seq; mTORC1 pathway assays; ER-phagy flux measurement\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo KO mouse, ubiquitination linkage assays, pathway validation; single lab\",\n      \"pmids\": [\"40673870\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"AMFR/gp78 is an ER-resident, multi-spanning membrane E3 ubiquitin ligase (RING-H2 type) that nucleates a degradation complex by recruiting the E2 Ube2g2 via an allosteric G2BR domain, binding p97/VCP via a VIM motif, and using its CUE domain for ubiquitin chain elongation; it mediates ERAD of diverse substrates (HMGCR, Insig-1, KAI1/CD82, CFTRΔf508, SOD1, ataxin-3, MAVS, and others), promotes Parkin-independent mitophagy by ubiquitinating mitofusins Mfn1/Mfn2, regulates innate immune signaling by catalyzing K27-linked polyubiquitination of STING (facilitating TBK1 recruitment), TAB3, and CIS, and is itself regulated by p38 MAPK phosphorylation at S538, MGRN1-mediated K11-linked trans-ubiquitination, CDK5-mediated phosphodegron at S516, and deubiquitylation by USP13 and USP34.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"AMFR (gp78) is an ER membrane-embedded RING-H2 E3 ubiquitin ligase that nucleates a multidomain degradation machine and serves as a central hub for ER-associated degradation (ERAD), mitochondrial quality control, and innate immune signaling [#0, #3]. Catalytically, gp78 requires three cooperating elements: a RING finger, a ubiquitin-binding CUE domain, and a G2BR site that binds the E2 Ube2g2 at a region distinct from the RING; loss of any one abolishes ubiquitylation and substrate degradation [#3]. G2BR binding drives an allosteric, ~50-fold increase in E2-RING affinity and primes Ube2g2 through redistribution of its conformational states, while the G2BR and CUE domains together extend polyubiquitin chains from the distal end in cis [#9, #26, #30]. gp78 couples ubiquitination to extraction by binding p97/VCP through a VIM motif that docks the ND1 domain and recruits p97 to the ER for retrotranslocation, with Ufd1 acting as a cofactor that enhances ligase activity [#4, #2, #6]. Through this machinery gp78 executes sterol-regulated degradation of HMG-CoA reductase and Insig-1 — bridged by Insig-1 and operating in parallel with the ligases Trc8 and RNF145 — and degrades substrates including CD3-delta, CFTRΔf508, and KAI1/CD82, the last linking gp78 to metastasis and proliferation control [#1, #5, #15, #32, #7, #14]. For some substrates gp78 acts as an E4-like factor downstream of an initiating E3, recognizing pre-conjugated ubiquitin via its CUE domain and operating in a post-retrotranslocation step in cooperation with the BAG6 complex [#8, #27]. Beyond ERAD, gp78 ubiquitinates mitofusins Mfn1/Mfn2 to drive mitochondrial fission and Parkin-independent mitophagy [#18], and it regulates innate immunity by catalyzing linkage-specific ubiquitination of signaling proteins — K27-linked ubiquitination of STING to recruit TBK1, K27-linked modification of TAB3 to activate TAK1/NF-κB, K48-linked ubiquitination of CIS, and mixed-linkage modification of NLRP3 to restrain inflammasome activation [#21, #37, #35, #34]. gp78 activity is tuned by phosphorylation (p38 at S538, CDK5 at S516) and by trans-ubiquitination from MGRN1, Hrd1, and TRIM25 [#28, #31, #29, #12, #25]. Bi-allelic truncating AMFR variants cause autosomal recessive hereditary spastic paraplegia through disrupted lipid homeostasis and lipid droplet accumulation [#38].\"\n,\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Before its enzymatic role was known, gp78 was placed in a defined ER subdomain, establishing the membrane platform on which its later degradation functions operate.\",\n      \"evidence\": \"Immunofluorescence, confocal and electron microscopy with ilimaquinone/nocodazole in mammalian cells defining the smooth-ER 'AMF-R tubule'\",\n      \"pmids\": [\"9365274\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not define molecular function\", \"Relationship of this subdomain to ERAD machinery not established\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Established that gp78 is an intrinsic ER-membrane RING-finger E3 ligase that recruits a specific E2 and degrades an ERAD substrate, defining its core catalytic identity.\",\n      \"evidence\": \"Overexpression and dominant-negative RING mutants, ubiquitination and CD3-delta degradation assays in mammalian cells\",\n      \"pmids\": [\"11724934\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"E2 recruitment site distinct from RING not yet mapped\", \"Full substrate range unknown\", \"Coupling to extraction machinery unaddressed\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Showed how ubiquitination is coupled to substrate extraction by demonstrating a dedicated p97/VCP-interacting domain required for retrotranslocation and degradation.\",\n      \"evidence\": \"Co-IP, domain deletion, RNAi and CD3-delta degradation assays\",\n      \"pmids\": [\"15331598\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise motif mediating p97 binding not yet identified\", \"Cofactor requirements unresolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Defined the three-domain architecture (RING, CUE, G2BR) required for catalysis and identified the VIM motif that directly docks the p97 ND1 domain, resolving the molecular logic of the gp78 degradation module.\",\n      \"evidence\": \"Systematic domain mutagenesis, ubiquitination and glycosylation/degradation assays, Co-IP and RNAi of Ufd1/p97\",\n      \"pmids\": [\"16407162\", \"16987818\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which CUE and G2BR cooperate not yet resolved\", \"Generality across substrates untested\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Placed gp78 at the heart of sterol-regulated lipid metabolism by showing it degrades HMGCR and Insig-1 via Insig-1 bridging, linking ERAD to cholesterol homeostasis.\",\n      \"evidence\": \"Co-IP, RNAi, sterol-regulated ubiquitination and pulse-chase assays\",\n      \"pmids\": [\"16168377\", \"17043353\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Redundancy with other HMGCR ligases not yet assessed\", \"Quantitative contribution to flux unclear\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Refined the extraction step by showing Ufd1 directly binds gp78 and uses distinct mono- and poly-ubiquitin sites to enhance ubiquitination and a post-ubiquitination step, and extended gp78's substrate range to the metastasis suppressor KAI1.\",\n      \"evidence\": \"Co-IP, domain mutagenesis, in vitro/in vivo ubiquitination, pulse-chase, RING mutant and in vivo metastasis assays\",\n      \"pmids\": [\"17681147\", \"18037895\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo physiological significance of Ufd1 cofactor role limited to assays\", \"KAI1 degradation mechanism in tumors not fully defined\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Revealed that gp78 can act as an E4-like elongation factor downstream of an initiating E3, recognizing pre-conjugated monoubiquitin through its CUE domain.\",\n      \"evidence\": \"Domain swapping, in vitro polyubiquitylation, RMA1 knockdown epistasis and Co-IP using CFTRΔf508\",\n      \"pmids\": [\"18216283\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which substrates use E3 vs E4 mode not generalized\", \"Structural basis of CUE chain recognition unresolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Provided the structural and mechanistic basis for E2 activation, showing G2BR allosterically primes Ube2g2 and dramatically boosts RING affinity.\",\n      \"evidence\": \"NMR structure, SPR, in vitro ubiquitylation and mutagenesis\",\n      \"pmids\": [\"19560420\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Dynamics of the allosteric transition not yet captured\", \"In-cell relevance of affinity gain untested\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Expanded gp78's role into neurodegeneration-associated proteostasis and revealed cross-regulation among ER ligases and engagement of toxin retrotranslocation.\",\n      \"evidence\": \"Co-IP, overexpression/knockdown, aggregation assays (SOD1, ataxin-3); Hrd1-null MEFs; cholera toxin/PDI binding and retro-translocation assays\",\n      \"pmids\": [\"19661182\", \"19835843\", \"19864457\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab functional studies\", \"Hierarchy of Hrd1/gp78/Derlin-1 not fully resolved\", \"Non-ubiquitination roles partly undefined\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Mapped the multi-ligase, multi-cofactor network controlling sterol-accelerated HMGCR degradation and identified the SPFH2-TMUB1 scaffold supporting gp78 function.\",\n      \"evidence\": \"Single and combined RNAi of gp78/Trc8, Co-IP and sterol-induced ubiquitination/degradation assays\",\n      \"pmids\": [\"22143767\", \"21343306\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Compensation mechanisms among ligases not mechanistically explained\", \"Stoichiometry of SPFH2-TMUB1-gp78 complex unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Established a non-ERAD role for gp78 in mitochondrial dynamics and quality control, degrading mitofusins to drive Parkin-independent mitophagy, with AMF endocytosis as an upstream modulator.\",\n      \"evidence\": \"WT vs RING-mutant overexpression, CCCP depolarization, Atg5/Parkin/Mfn siRNA, LC3 marker; pharmacological/genetic dissection of AMF uptake and Rac1\",\n      \"pmids\": [\"23427266\", \"23690547\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How a single ligase coordinates ERAD vs mitophagy spatially unresolved\", \"Physiological mitophagy contexts in vivo limited\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Opened the immune-regulatory dimension by showing gp78 at the ER-mitochondria interface controls MAVS and RLR antiviral signaling via both ERAD and ERAD-independent mechanisms.\",\n      \"evidence\": \"Co-IP domain mapping, mutant constructs, RNAi, IFN reporter and VSV infection assays\",\n      \"pmids\": [\"24285545\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Relative contribution of degradative vs non-degradative arms unquantified\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined gp78 substrate-specificity safeguards and chain-elongation chemistry — DUB-mediated protection of machinery, additional substrates, and distal-end chain extension via cooperative G2BR/CUE action.\",\n      \"evidence\": \"Co-IP, in vitro chain assembly and polyubiquitylation, site/domain mutagenesis (Ubl4A/USP13, HERP, HSPA5, AMF/TRIM25)\",\n      \"pmids\": [\"24424410\", \"24496447\", \"26119938\", \"24810856\", \"25409783\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Each substrate validated largely in single labs\", \"In vivo relevance of machinery-protective USP13 axis limited\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined a linkage-specific signaling output by showing the AMFR-INSIG1 complex catalyzes K27-linked STING ubiquitination to recruit TBK1, establishing gp78 as a positive regulator of cytosolic-DNA antiviral immunity.\",\n      \"evidence\": \"Co-IP, ubiquitination site mapping, RNAi, Insig1 myeloid-specific knockout mice and HSV-1 infection\",\n      \"pmids\": [\"25526307\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of K27 specificity unknown\", \"How INSIG1 redirects gp78 to immune substrates unclear\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Clarified gp78's position in the ERAD pathway hierarchy (downstream of Hrd1, post-retrotranslocation with BAG6) and identified p38-mediated S538 phosphorylation as a switch limiting mitofusin degradation.\",\n      \"evidence\": \"shRNA/CRISPR, retrotranslocation and ubiquitination assays; MS phosphosite mapping, phosphomimetic mutants, p38 inhibitor and morphology imaging\",\n      \"pmids\": [\"26424800\", \"26337390\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab epistasis\", \"How S538 phosphorylation alters substrate engagement without affecting in vitro activity unresolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Showed gp78 abundance is gated by trans-ubiquitination, with MGRN1 using K11-linked chains and cytosolic Ca2+ relieving this brake to license mitophagy.\",\n      \"evidence\": \"Co-IP, K11 linkage-specific ubiquitination, Ca2+ chelation and MGRN1 catalytic mutants\",\n      \"pmids\": [\"26743086\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"How Ca2+ disrupts MGRN1-gp78 interaction mechanistically unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Detailed the dynamic energy landscape of E2 activation and a CDK5 phosphodegron at S516 that destabilizes gp78 with neuroprotective consequences.\",\n      \"evidence\": \"NMR conformational dynamics with mutagenesis/ubiquitylation; in vitro kinase assay, S516 mutants, MPTP/MPP+ Parkinson's models\",\n      \"pmids\": [\"28434917\", \"28528366\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Allosteric model is structural/in vitro\", \"S516 phosphodegron in vivo relevance limited to disease models in single lab\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Through unbiased genome-wide screening, defined the redundant ligase network (RNF145, gp78, Hrd1) governing HMGCR degradation and sterol responsiveness.\",\n      \"evidence\": \"Genome-wide CRISPR screens, endogenous HMGCR reporter, siRNA and ubiquitination/sterol assays\",\n      \"pmids\": [\"30543180\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Division of labor among the three ligases under physiological sterol flux not fully quantified\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Established AMFR as a cell-surface receptor (for CCL1) coupling ligand binding to Spry1 ubiquitination and Ras-ERK-driven fibrosis, broadening its activity beyond intracellular degradation.\",\n      \"evidence\": \"MS of CCL1 complexes, fibroblast AMFR deletion, ubiquitination and Ras-ERK assays, pulmonary fibrosis mouse models\",\n      \"pmids\": [\"34407391\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Reconciliation of receptor role with ER-membrane topology unaddressed\", \"Direct vs adaptor-mediated CCL1 binding unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Expanded linkage-specific immune and transporter regulation: K48 ubiquitination of CIS promoting STAT5/GM-CSF, mixed-linkage NLRP3 ubiquitination restraining inflammasome, and non-degradative K542 ubiquitination promoting EAAT2 oligomerization; plus a K27/K33 ER-phagy axis on FAM134B.\",\n      \"evidence\": \"Co-IP, linkage-specific ubiquitination, conditional/knockout mice, signaling and oligomer assays, ER-phagy flux and disease models\",\n      \"pmids\": [\"35333296\", \"35110683\", \"35938532\", \"40673870\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How AMFR selects K48 vs mixed vs non-degradative linkages on different substrates unresolved\", \"Some readouts single-lab\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Connected AMFR to human Mendelian disease and infection-driven inflammation: bi-allelic truncating variants cause hereditary spastic paraplegia via lipid dysregulation, and AMFR drives TAB3 K27 ubiquitination/TAK1-NF-κB during S. aureus infection.\",\n      \"evidence\": \"Patient WGS, patient fibroblasts/neural stem cells with rescue, amfra zebrafish and statin treatment; CRISPR screen, Co-IP, K27/K649 ubiquitination, pneumonia models\",\n      \"pmids\": [\"37119330\", \"36593296\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"HSP mechanism linking lipid droplet accumulation to neurodegeneration incompletely defined\", \"Single disease publication\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Extended AMFR's antiviral and immunometabolic roles: a patient STING-pathway variant (R594C) impairs K27-STING ubiquitination/trafficking, AMFR K48-ubiquitinates flaviviral NS2A to suppress ER-phagy, and cholesterol/p38 control AMFR-mediated PDL1 degradation in cancer.\",\n      \"evidence\": \"WT vs variant ubiquitination/trafficking/reporter and reconstitution; viral mutant, organoid and mouse infection models; Co-IP, cholesterol manipulation and xenografts\",\n      \"pmids\": [\"38277122\", \"39505910\", \"39231894\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single case study for R594C\", \"p38/cholesterol regulation of substrate choice mechanistically incomplete\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how a single ER-membrane ligase achieves its diverse linkage-specific outputs (K11/K27/K33/K48/mixed) and partitions among ERAD, mitophagy, ER-phagy, receptor signaling, and surface-receptor functions across cell types.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model explains linkage-type selection\", \"Spatial/temporal control distinguishing competing functions unknown\", \"Mechanism enabling extracellular ligand reception by an ER-resident ligase undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016874\", \"supporting_discovery_ids\": [0, 3, 7, 18, 21]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 3, 8, 26]},\n      {\"term_id\": \"GO:0031386\", \"supporting_discovery_ids\": [21, 34, 35, 37, 41]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [9, 30]},\n      {\"term_id\": \"GO:0001618\", \"supporting_discovery_ids\": [33]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [0, 4, 43]},\n      {\"term_id\": \"GO:0005789\", \"supporting_discovery_ids\": [0, 43]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [18, 19, 28]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [33]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 2, 3, 6]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [1, 5, 15, 32]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [21, 34, 35, 37]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [18, 41, 44]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [19, 33, 35]}\n    ],\n    \"complexes\": [\n      \"gp78-Insig-1 E3 complex\",\n      \"gp78-SPFH2-TMUB1 complex\",\n      \"gp78-p97/VCP-Ufd1 retrotranslocation module\"\n    ],\n    \"partners\": [\n      \"UBE2G2\",\n      \"VCP\",\n      \"INSIG1\",\n      \"UFD1\",\n      \"STING1\",\n      \"TAB3\",\n      \"MFN1\",\n      \"FAM134B\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}