{"gene":"GOLGA1","run_date":"2026-06-10T01:55:21","timeline":{"discoveries":[{"year":1999,"finding":"Golgin-97 contains a conserved C-terminal ~50 amino acid 'GRIP' domain that is sufficient to specify Golgi targeting in mammalian cells when fused to GFP, identifying this domain as the Golgi-targeting determinant of golgin-97.","method":"GFP fusion constructs expressed in mammalian cells; fluorescence microscopy","journal":"Current Biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — replicated independently in three simultaneous papers (PMIDs 10209120, 10209123, 10209125) using GFP fusions and mutagenesis","pmids":["10209120","10209123","10209125"],"is_preprint":false},{"year":1999,"finding":"The GRIP domain of golgin-97 preferentially binds to Rab6 on protein blots, and mutations of the conserved tyrosine in the GRIP domain that abolish Golgi targeting also abolish this Rab6 interaction, suggesting Rab6 is a targeting determinant.","method":"Protein blot overlay binding assay; site-directed mutagenesis of conserved tyrosine","journal":"Current Biology","confidence":"Medium","confidence_rationale":"Tier 3 / Weak — single lab, protein blot overlay (not co-IP), single method; later superseded by Arl1 as primary targeting GTPase","pmids":["10209123"],"is_preprint":false},{"year":1999,"finding":"Site-directed mutagenesis of the GRIP domain of golgin-97 identified two conserved aromatic residues (including a critical tyrosine) essential for Golgi targeting function; overexpressed GRIP domains of p230 and golgin-97 displaced each other from Golgi membranes, indicating they compete for the same membrane determinants.","method":"Site-directed mutagenesis; GFP-fusion overexpression and competitive displacement assay","journal":"Current Biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — mutagenesis with functional readout, replicated across multiple labs in the same year","pmids":["10209125","10209120"],"is_preprint":false},{"year":2005,"finding":"Arl1 (Arf-like GTPase) mediates TGN recruitment of golgin-97 by interacting directly with its GRIP domain; overexpression of GCC185 does not colocalize with golgin-97 GRIP-domain binding structures, and GCC185 and GCC88 GRIP domains do not interact with Arl1 in vivo, distinguishing golgin-97 as an Arl1-dependent TGN golgin.","method":"Co-immunoprecipitation; in vivo GRIP domain overexpression; immunofluorescence colocalization","journal":"Journal of Cell Science","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal interaction studies, multiple orthogonal methods, consistent with prior in vitro data and replicated in subsequent studies","pmids":["15522892"],"is_preprint":false},{"year":2005,"finding":"ARFRP1 (ADP-ribosylation factor-related protein 1) is an essential upstream regulator for targeting of Arl1 and subsequently golgin-97 (and golgin-245) onto Golgi membranes; in concert, ARFRP1/Arl1/golgin-97 regulate Golgi-to-plasma membrane transport of VSV-G and retrograde transport of TGN38 and Shiga toxin.","method":"RNA interference knockdown; immunofluorescence; vesicular stomatitis virus G protein transport assay; Shiga toxin retrograde transport assay","journal":"Journal of Cell Science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA loss-of-function with multiple trafficking readouts, single lab","pmids":["16129887"],"is_preprint":false},{"year":2005,"finding":"Golgin-97 forms homodimers exclusively (not heterodimers with other GRIP domain proteins p230, GCC88, or GCC185), forming parallel coiled-coil dimers; purified recombinant golgin-97 is 67% alpha-helical by CD spectroscopy, consistent with an extended rod-like homodimeric structure.","method":"Co-immunoprecipitation of epitope-tagged proteins; chemical cross-linking; yeast two-hybrid; CD spectroscopy of purified recombinant protein","journal":"Biochemical Journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple orthogonal methods (co-IP, cross-linking, yeast two-hybrid, biophysical spectroscopy) in single study","pmids":["15654769"],"is_preprint":false},{"year":2005,"finding":"Golgin-97 selectively associates with TGN-derived tubulovesicular carriers containing E-cadherin; siRNA knockdown of golgin-97 inhibits E-cadherin trafficking from the TGN, identifying golgin-97 as an essential and selective component for E-cadherin export from the TGN.","method":"Live-cell fluorescence microscopy with GFP-tagged GRIP domains; siRNA knockdown; co-localization of GRIP domain with E-cadherin-GFP in tubular carriers","journal":"Traffic","confidence":"High","confidence_rationale":"Tier 2 / Moderate — siRNA knockdown with specific cargo trafficking readout plus live imaging, two orthogonal approaches in single lab","pmids":["16262725"],"is_preprint":false},{"year":2006,"finding":"Three-tier hierarchical interactions govern Golgi targeting of golgin-97 GRIP domain: (1) GRIP domain self-dimerization is required for (2) bivalent interaction with Arl1-GTP, and (3) a third group of residues including positively charged arginine between α1 and α2 helices and hydrophobic residues C-terminal to the GRIP domain (e.g. W744) mediate direct membrane lipid interaction, as shown by surface plasmon resonance.","method":"Mutational analysis of >30 GRIP domain mutants; surface plasmon resonance for lipid binding; in vivo targeting assays","journal":"Traffic","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro biophysical assay (SPR) combined with extensive mutagenesis and in vivo targeting readout, single lab","pmids":["16899086"],"is_preprint":false},{"year":2010,"finding":"FIP1/RCP (a Rab11 effector) directly binds to golgin-97, with the binding domain mapping to the C-terminus of golgin-97 adjacent to its GRIP domain. This interaction does not affect golgin-97 TGN recruitment but is required for tethering/fusion of recycling endosome-derived retrograde transport vesicles to the TGN, as assayed by TGN38 and Shiga toxin retrograde trafficking.","method":"Proteomic identification by mass spectrometry; co-immunoprecipitation; fluorescence and electron microscopy; functional retrograde transport assays (TGN38, STxB)","journal":"Molecular Biology of the Cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MS identification plus co-IP plus functional transport assay, single lab","pmids":["20610657"],"is_preprint":false},{"year":2017,"finding":"A short N-terminal 20–50 residue region of golgin-97 is necessary and sufficient to capture endosome-to-Golgi transport carriers when relocated to an ectopic location. Golgin-97 and golgin-245 share a closely related N-terminal capture motif distinct from that of GCC88, indicating they capture a specific class of endosome-derived carriers.","method":"Ectopic golgin relocation assay; systematic N-terminal truncation and motif mapping; vesicle accumulation quantification","journal":"BMC Biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — ectopic relocation functional assay with deletion mapping across six golgins, systematic approach in single lab","pmids":["28122620"],"is_preprint":false},{"year":2017,"finding":"TBC1D23 acts as a bridging adaptor between golgin-97 (and golgin-245) and endosome-derived vesicles: its Rab GAP domain binds to a conserved motif at the tip (N-terminus) of golgin-97 and golgin-245 at the trans-Golgi, while its C-terminus binds to the WASH complex on endosomal vesicles, thereby conferring specificity to endosome-to-Golgi trafficking.","method":"Proximity biotinylation (BioID) of golgin-captured vesicles; co-immunoprecipitation; siRNA knockdown with trafficking assay; ectopic golgin relocation system","journal":"Nature Cell Biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — proximity biotinylation plus co-IP plus functional trafficking assay, multiple orthogonal methods, single lab with rigorous controls","pmids":["29084197"],"is_preprint":false},{"year":2020,"finding":"Crystal structure of TBC1D23 N-terminus reveals the rhodanese domain packs against the TBC domain and together they form the platform that interacts with golgin-97 and golgin-245; the rhodanese domain is structurally inactive as a sulfurtransferase/phosphatase, and disrupting golgin-97/245-binding (but not the putative catalytic site) impairs neuronal growth and brain development in zebrafish.","method":"X-ray crystallography; zebrafish in vivo model; structure-guided mutagenesis","journal":"PLoS Biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure plus functional in vivo validation with structure-guided mutations in single study","pmids":["32453802"],"is_preprint":false},{"year":2020,"finding":"Hydrogen peroxide treatment causes degradation of Arl1 and consequent dissociation of golgin-97 (and golgin-245) from the trans-Golgi, with loss of trans-Golgi cisternae and inhibition of both anterograde and retrograde protein transport, identifying Arl1 as essential for golgin-97 membrane retention.","method":"Immunofluorescence; Western blotting; pharmacological H2O2 treatment; rescue with ROS scavenger N-acetyl cysteine and protease inhibitors; protein transport assays","journal":"Molecular Biology of the Cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple methods (IF, WB, functional transport assay, pharmacological rescue), single lab","pmids":["32583744"],"is_preprint":false},{"year":2022,"finding":"PARP12 mono-ADP-ribosylates golgin-97 at an acidic cluster in its coiled-coil domain; this modification is required for E-cadherin and VSVG (but not TNFα/golgin-245-dependent cargo) export from TGN to plasma membrane. PARP12 depletion or mutation of the acidic cluster causes defective carrier fission and cargo accumulation in a trans-Golgi/Rab11-positive intermediate. PARP12's catalytic activity is activated by PKD-mediated direct phosphorylation of PARP12.","method":"In vitro ADP-ribosylation assay; site-directed mutagenesis of acidic cluster; siRNA knockdown; live-cell imaging of cargo trafficking; co-immunoprecipitation","journal":"Proceedings of the National Academy of Sciences","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro enzymatic assay plus mutagenesis plus siRNA loss-of-function with specific cargo trafficking readout, multiple orthogonal methods in single study","pmids":["34969853"],"is_preprint":false},{"year":2018,"finding":"Golgin-97 knockdown in breast cancer cells activates NF-κB by reducing IκBα protein levels, promoting invasion-related gene expression; re-expression of golgin-97 restores IκBα and suppresses NF-κB activity. Both TGN-bound and cytosolic forms of golgin-97 inhibit NF-κB, and this function is independent of general Golgi integrity.","method":"siRNA knockdown; golgin-97 re-expression; subcellular fractionation; luciferase reporter assay; Western blotting; immunofluorescence","journal":"Cell Communication and Signaling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple methods (knockdown/rescue, reporter assay, fractionation), single lab","pmids":["29703230"],"is_preprint":false},{"year":2024,"finding":"TBC1D23 (bound to golgin-97 via its N-terminal domain) captures endosome-to-Golgi vesicles by directly recognizing a threonine-leucine-tyrosine (TLY) acidic-cluster motif present in cargo proteins (carboxypeptidase D, syntaxin-16, and other endosome-to-Golgi cargos) carried within those vesicles; a crystal structure of TBC1D23 C-terminal domain bound to the acidic TLY motif was determined, and structure-guided mutations that disrupt motif binding in vitro also block vesicle capture in vivo.","method":"Protein binding assays; X-ray crystallography; structure-guided mutagenesis; in vivo vesicle capture assay","journal":"Science Advances","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure plus structure-guided mutagenesis validated in vivo, multiple orthogonal methods in single study","pmids":["38552021"],"is_preprint":false},{"year":2006,"finding":"During poxvirus infection, golgin-97 is transported from the TGN to viral replication/assembly sites (viral factories) and incorporated into mature virions, where it associates with the insoluble core protein fraction; siRNA depletion of golgin-97 blocks formation of mature virus (first infectious form) but not its precursor immature virus, demonstrating a role in viral morphogenesis/core maturation.","method":"Immunofluorescence; Western blotting of virion fractions; RNA interference knockdown; electron microscopy of virion morphology","journal":"Journal of Virology / Virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA loss-of-function with specific virion morphogenesis readout plus virion fractionation, reported across two papers from same lab","pmids":["16987983","17276477"],"is_preprint":false},{"year":2018,"finding":"Golgin-97 directly binds the cytoplasmic domain of the inward rectifying potassium channel Kir2.1 via its GRIP domain (shown by in vitro protein interaction); siRNA knockdown of golgin-97 prevents exit of Kir2.1 from the Golgi, identifying golgin-97 as required for targeting Kir2.1 to the TGN and its subsequent AP-1-dependent export.","method":"Systematic screen of Golgi tethers; in vitro protein-interaction pull-down assay; RNA interference knockdown; fluorescence imaging","journal":"Frontiers in Physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro direct binding assay plus siRNA functional readout, single lab","pmids":["30123141"],"is_preprint":false},{"year":2018,"finding":"Retromer-dependent retrograde trafficking of CI-M6PR uses transport carriers tethered specifically by GCC88, not by golgin-97 or golgin-245, demonstrating that golgin-97 is not required for CI-M6PR retrograde transport.","method":"Vps35 knockout; electron microscopy; vesicle tethering assay with specific golgin markers","journal":"Journal of Cell Biology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — negative result for golgin-97 established by knockout plus EM-based vesicle cargo analysis, single lab","pmids":["30559172"],"is_preprint":false},{"year":2003,"finding":"Overexpression of isolated GRIP domain fragments of golgin-97 (or tGolgin-1) alters TGN organization, inhibits vesicular transport from TGN to plasma membrane, inhibits furin-dependent substrate cleavage, and causes mislocalization of TGN46 to multivesicular late endosomes; a conserved GRIP domain tyrosine mutation abolishes these effects.","method":"Semi-quantitative immunofluorescence; GRIP domain overexpression; electron microscopy; vesicular transport assay; mutagenesis","journal":"Journal of Cell Science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — dominant-negative overexpression with multiple functional readouts plus mutagenesis, single lab","pmids":["13130094"],"is_preprint":false}],"current_model":"Golgin-97 is a trans-Golgi network (TGN)-localized coiled-coil tethering protein that is recruited to the TGN via a C-terminal GRIP domain, which dimerizes, binds activated Arl1 GTPase (itself activated by ARFRP1), and directly contacts membrane lipids; at the TGN it captures endosome-derived transport vesicles through its N-terminal motif by serving as a docking site for TBC1D23, which in turn recognizes a cargo-encoded acidic TLY motif on the incoming vesicles, and it selectively promotes export of specific basolateral cargoes (e.g., E-cadherin, Kir2.1) via a mechanism regulated by PARP12-mediated mono-ADP-ribosylation downstream of PKD activation, while also suppressing NF-κB activity independently of its Golgi localization."},"narrative":{"mechanistic_narrative":"Golgin-97 (GOLGA1) is a trans-Golgi network (TGN) coiled-coil tethering protein that captures endosome- and recycling-endosome-derived transport carriers and promotes selective export of basolateral cargoes from the TGN [PMID:28122620, PMID:16262725]. It is recruited to the TGN through a C-terminal ~50-residue GRIP domain that is necessary and sufficient for Golgi targeting [PMID:10209120, PMID:10209123, PMID:10209125]; targeting requires a three-tier hierarchy in which the GRIP domain first self-dimerizes, then bivalently engages the activated GTPase Arl1, and finally contacts membrane lipids directly through basic and hydrophobic residues flanking the domain [PMID:16899086, PMID:15654769]. Arl1 itself depends on the upstream regulator ARFRP1 for its own Golgi localization, placing golgin-97 at the bottom of an ARFRP1→Arl1→golgin-97 recruitment cascade that governs both anterograde and retrograde TGN transport [PMID:16129887]; Arl1 stability is required continuously, as its oxidative degradation strips golgin-97 from the membrane [PMID:32583744]. At its exposed N-terminus, a short capture motif shared with golgin-245 docks incoming vesicles via the bridging adaptor TBC1D23, whose rhodanese-TBC platform binds the golgin tip while its C-terminal domain engages the WASH complex on endosomal vesicles and recognizes an acidic TLY cargo motif, thereby conferring endosome-to-Golgi specificity [PMID:28122620, PMID:29084197, PMID:38552021, PMID:32453802]. Golgin-97 selectively mediates TGN export of E-cadherin and the potassium channel Kir2.1, the latter through direct GRIP-domain binding, and its E-cadherin/VSVG export function is gated by PARP12-mediated mono-ADP-ribosylation of an acidic cluster in its coiled-coil, downstream of PKD activation [PMID:16262725, PMID:30123141, PMID:34969853]. Independently of its Golgi role, golgin-97 suppresses NF-κB activity by maintaining IκBα levels, a function exhibited by both membrane-bound and cytosolic pools [PMID:29703230].","teleology":[{"year":1999,"claim":"Establishing how golgin-97 reaches the Golgi, the C-terminal GRIP domain was defined as a transferable, self-contained Golgi-targeting determinant and the conserved aromatic/tyrosine residues required for it were mapped.","evidence":"GFP-GRIP fusion targeting, site-directed mutagenesis, and competitive displacement in mammalian cells","pmids":["10209120","10209123","10209125"],"confidence":"High","gaps":["Did not identify the membrane determinant the GRIP domain recognizes","Rab6 binding on blots was later superseded by Arl1 as the primary targeting GTPase"]},{"year":2003,"claim":"Dominant-negative GRIP-domain overexpression showed golgin-97 is functionally required for TGN-to-plasma-membrane transport and TGN organization, moving it from a localization marker to a trafficking effector.","evidence":"Isolated GRIP-domain overexpression with EM, transport and furin-cleavage assays, and a tyrosine mutant control","pmids":["13130094"],"confidence":"Medium","gaps":["Overexpression of an isolated fragment may act non-physiologically","No direct cargo or vesicle partner identified"]},{"year":2005,"claim":"The targeting GTPase and the upstream cascade were resolved: Arl1-GTP recruits golgin-97 via the GRIP domain, and ARFRP1 is required upstream to position Arl1, distinguishing golgin-97 from Arl1-independent GRIP golgins.","evidence":"Co-IP, in vivo GRIP overexpression and colocalization, plus siRNA of ARFRP1 with VSV-G and Shiga toxin transport assays","pmids":["15522892","16129887"],"confidence":"Medium","gaps":["Quantitative contribution of lipid vs GTPase binding not separated here","Did not define the captured vesicle class"]},{"year":2005,"claim":"Biophysical characterization established golgin-97 as an extended parallel coiled-coil homodimer, explaining how a single golgin presents a long tether without cross-pairing with other GRIP proteins.","evidence":"Co-IP, chemical cross-linking, yeast two-hybrid, and CD spectroscopy of recombinant protein","pmids":["15654769"],"confidence":"High","gaps":["No full-length structure","Stoichiometry of dimer engagement with Arl1 not resolved"]},{"year":2005,"claim":"The first specific cargo was identified, showing golgin-97 is not a generic tether but selectively required for E-cadherin export in TGN-derived tubulovesicular carriers.","evidence":"Live imaging of GFP-tagged carriers plus siRNA knockdown with E-cadherin trafficking readout","pmids":["16262725"],"confidence":"High","gaps":["Mechanism linking golgin-97 to the E-cadherin carrier not defined","Direct vs indirect cargo selection unclear at this stage"]},{"year":2006,"claim":"The molecular logic of GRIP targeting was resolved into a three-tier hierarchy (dimerization, bivalent Arl1-GTP binding, direct lipid contact), integrating the earlier mutagenesis and GTPase data into one mechanism.","evidence":"Mutational analysis of >30 GRIP mutants with SPR lipid binding and in vivo targeting assays","pmids":["16899086"],"confidence":"High","gaps":["Lipid identity recognized by basic/hydrophobic residues not specified","Did not address N-terminal vesicle-capture function"]},{"year":2006,"claim":"A non-canonical role emerged in poxvirus morphogenesis, where golgin-97 is rerouted to viral factories and required for mature virion formation.","evidence":"Immunofluorescence, virion fractionation, siRNA depletion and EM of virion morphology","pmids":["16987983","17276477"],"confidence":"Medium","gaps":["Mechanism by which golgin-97 contributes to core maturation unknown","Relationship to its TGN tethering function unclear"]},{"year":2010,"claim":"Identification of the Rab11 effector FIP1/RCP as a C-terminal partner provided a molecular link for tethering recycling-endosome-derived retrograde carriers, separate from the GRIP recruitment function.","evidence":"MS identification, co-IP, EM, and TGN38/Shiga toxin retrograde transport assays","pmids":["20610657"],"confidence":"Medium","gaps":["Direct vs adaptor-mediated binding not fully resolved","Single lab, not reciprocally cross-validated against later TBC1D23 model"]},{"year":2017,"claim":"The N-terminal capture motif and its adaptor were defined, showing a short tip region is necessary and sufficient to capture a specific endosome-derived carrier class via the bridging adaptor TBC1D23, which links the golgin tip to the WASH complex.","evidence":"Ectopic golgin relocation, N-terminal truncation mapping, BioID, co-IP and siRNA trafficking assays across multiple golgins","pmids":["28122620","29084197"],"confidence":"High","gaps":["How TBC1D23 distinguishes correct vesicles at the molecular level not yet shown","Physiological cargo of these carriers not enumerated here"]},{"year":2018,"claim":"Cargo selectivity was sharpened by positive and negative results: golgin-97 directly binds and exports Kir2.1, but is dispensable for retromer-dependent CI-M6PR retrograde transport, which uses GCC88.","evidence":"Golgi-tether screen with in vitro pull-downs and siRNA for Kir2.1; Vps35 knockout with EM golgin-marker tethering for CI-M6PR","pmids":["30123141","30559172"],"confidence":"Medium","gaps":["Structural basis of Kir2.1 GRIP-domain binding not determined","Full cargo repertoire of golgin-97 vs sibling golgins incomplete"]},{"year":2018,"claim":"A Golgi-independent signaling role was uncovered: golgin-97 suppresses NF-κB by maintaining IκBα, linking its loss to breast cancer invasion.","evidence":"siRNA knockdown/re-expression, fractionation, luciferase reporter and Western blot in breast cancer cells","pmids":["29703230"],"confidence":"Medium","gaps":["Molecular mechanism by which golgin-97 stabilizes IκBα unknown","Direct binding partners in the NF-κB axis not identified"]},{"year":2020,"claim":"Structural and stability mechanisms were added: the TBC1D23 rhodanese-TBC platform was shown to form the golgin-binding surface (catalytically inactive), and Arl1 was shown to be continuously required, as its oxidative degradation releases golgin-97 from the membrane.","evidence":"X-ray crystallography with zebrafish neurodevelopment assay; H2O2 treatment with NAC/protease-inhibitor rescue and transport assays","pmids":["32453802","32583744"],"confidence":"Medium","gaps":["Whether oxidative regulation of golgin-97 occurs physiologically not established","Functional consequence of golgin-97 binding in neurodevelopment via TBC1D23 vs golgin-97 itself not separated"]},{"year":2022,"claim":"A post-translational regulatory layer was defined: PKD-activated PARP12 mono-ADP-ribosylates an acidic cluster in golgin-97's coiled-coil, gating carrier fission and E-cadherin/VSVG export.","evidence":"In vitro ADP-ribosylation, acidic-cluster mutagenesis, siRNA, live-cell cargo imaging and co-IP","pmids":["34969853"],"confidence":"High","gaps":["How the modification mechanically drives carrier fission unknown","Why golgin-245-dependent cargo is exempt not explained"]},{"year":2024,"claim":"Cargo recognition at the carrier level was resolved structurally: TBC1D23's C-terminal domain directly reads an acidic TLY motif on endosome-to-Golgi cargoes, completing the chain from golgin tip to specific cargo.","evidence":"Protein binding assays, X-ray crystallography of TBC1D23-CTD bound to the TLY motif, and structure-guided mutagenesis with in vivo capture assay","pmids":["38552021"],"confidence":"High","gaps":["Generality of the TLY code across the full cargo set not exhaustively mapped","How motif recognition is coordinated with WASH-complex binding not resolved"]},{"year":null,"claim":"It remains unknown how golgin-97's distinct activities—TGN vesicle tethering, selective basolateral cargo export, and Golgi-independent NF-κB suppression—are integrated and switched within a single cell, and whether the protein has a defined Mendelian disease association.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model of full-length dimer engaging Arl1 and a vesicle simultaneously","Mechanism of cytosolic golgin-97 pool and its NF-κB function uncharacterized","No direct evidence linking GOLGA1 to a human disease in the corpus"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[9,10,6]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[7]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[5]}],"localization":[{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[0,3,5]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[14]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[6,9,10]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[4,6,17]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[14]}],"complexes":[],"partners":["ARL1","ARFRP1","TBC1D23","RAB11FIP1","PARP12","KCNJ2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q92805","full_name":"Golgin subfamily A member 1","aliases":["Golgin-97"],"length_aa":767,"mass_kda":88.2,"function":"Involved in vesicular trafficking at the Golgi apparatus level. Involved in endosome-to-Golgi trafficking. Mechanistically, captures transport vesicles arriving from endosomes via the protein TBC1D23 (PubMed:29084197, PubMed:38552021). Recognized vesicles are then tethered to the trans-Golgi before subsequent SNARE engagement and vesicle fusion. Selectively regulates E-cadherin transport from the trans-Golgi network in tubulovesicular carriers (PubMed:34969853) (Microbial infection) Plays an important role in poxvirus morphogenesis. Translocates into the viral factories where it may transport the membrane fragments and associated protein factors important for virus maturation to the sites of virion assembly","subcellular_location":"Golgi apparatus membrane; Golgi apparatus, trans-Golgi network membrane; Cytoplasmic vesicle, secretory vesicle, acrosome","url":"https://www.uniprot.org/uniprotkb/Q92805/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/GOLGA1","classification":"Not Classified","n_dependent_lines":4,"n_total_lines":1208,"dependency_fraction":0.0033112582781456954},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/GOLGA1","total_profiled":1310},"omim":[{"mim_id":"607418","title":"GRIP AND COILED-COIL DOMAINS-CONTAINING PROTEIN 1; GCC1","url":"https://www.omim.org/entry/607418"},{"mim_id":"606918","title":"GOLGIN A5; GOLGA5","url":"https://www.omim.org/entry/606918"},{"mim_id":"604505","title":"THYROID HORMONE RECEPTOR INTERACTOR 11; TRIP11","url":"https://www.omim.org/entry/604505"},{"mim_id":"603425","title":"ADP-RIBOSYLATION FACTOR-LIKE GTPase 1; ARL1","url":"https://www.omim.org/entry/603425"},{"mim_id":"602580","title":"GOLGIN A2; GOLGA2","url":"https://www.omim.org/entry/602580"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Golgi apparatus","reliability":"Enhanced"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/GOLGA1"},"hgnc":{"alias_symbol":["golgin-97","MGC33154"],"prev_symbol":[]},"alphafold":{"accession":"Q92805","domains":[{"cath_id":"1.10.287","chopping":"709-743","consensus_level":"high","plddt":87.1114,"start":709,"end":743}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q92805","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q92805-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q92805-F1-predicted_aligned_error_v6.png","plddt_mean":78.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=GOLGA1","jax_strain_url":"https://www.jax.org/strain/search?query=GOLGA1"},"sequence":{"accession":"Q92805","fasta_url":"https://rest.uniprot.org/uniprotkb/Q92805.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q92805/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q92805"}},"corpus_meta":[{"pmid":"10209120","id":"PMC_10209120","title":"The GRIP domain - a novel Golgi-targeting domain found in several coiled-coil proteins.","date":"1999","source":"Current biology : CB","url":"https://pubmed.ncbi.nlm.nih.gov/10209120","citation_count":159,"is_preprint":false},{"pmid":"9324025","id":"PMC_9324025","title":"Molecular cloning of a novel 97-kd Golgi complex autoantigen associated with Sjögren's syndrome.","date":"1997","source":"Arthritis and rheumatism","url":"https://pubmed.ncbi.nlm.nih.gov/9324025","citation_count":147,"is_preprint":false},{"pmid":"10209123","id":"PMC_10209123","title":"A novel Rab6-interacting domain defines a family of Golgi-targeted coiled-coil proteins.","date":"1999","source":"Current biology : CB","url":"https://pubmed.ncbi.nlm.nih.gov/10209123","citation_count":136,"is_preprint":false},{"pmid":"10209125","id":"PMC_10209125","title":"A novel Golgi-localisation domain shared by a class of coiled-coil peripheral membrane proteins.","date":"1999","source":"Current biology : 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site-directed mutagenesis of conserved tyrosine\",\n      \"journal\": \"Current Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, protein blot overlay (not co-IP), single method; later superseded by Arl1 as primary targeting GTPase\",\n      \"pmids\": [\"10209123\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Site-directed mutagenesis of the GRIP domain of golgin-97 identified two conserved aromatic residues (including a critical tyrosine) essential for Golgi targeting function; overexpressed GRIP domains of p230 and golgin-97 displaced each other from Golgi membranes, indicating they compete for the same membrane determinants.\",\n      \"method\": \"Site-directed mutagenesis; GFP-fusion overexpression and competitive displacement assay\",\n      \"journal\": \"Current Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mutagenesis with functional readout, replicated across multiple labs in the same year\",\n      \"pmids\": [\"10209125\", \"10209120\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Arl1 (Arf-like GTPase) mediates TGN recruitment of golgin-97 by interacting directly with its GRIP domain; overexpression of GCC185 does not colocalize with golgin-97 GRIP-domain binding structures, and GCC185 and GCC88 GRIP domains do not interact with Arl1 in vivo, distinguishing golgin-97 as an Arl1-dependent TGN golgin.\",\n      \"method\": \"Co-immunoprecipitation; in vivo GRIP domain overexpression; immunofluorescence colocalization\",\n      \"journal\": \"Journal of Cell Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal interaction studies, multiple orthogonal methods, consistent with prior in vitro data and replicated in subsequent studies\",\n      \"pmids\": [\"15522892\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"ARFRP1 (ADP-ribosylation factor-related protein 1) is an essential upstream regulator for targeting of Arl1 and subsequently golgin-97 (and golgin-245) onto Golgi membranes; in concert, ARFRP1/Arl1/golgin-97 regulate Golgi-to-plasma membrane transport of VSV-G and retrograde transport of TGN38 and Shiga toxin.\",\n      \"method\": \"RNA interference knockdown; immunofluorescence; vesicular stomatitis virus G protein transport assay; Shiga toxin retrograde transport assay\",\n      \"journal\": \"Journal of Cell Science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA loss-of-function with multiple trafficking readouts, single lab\",\n      \"pmids\": [\"16129887\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Golgin-97 forms homodimers exclusively (not heterodimers with other GRIP domain proteins p230, GCC88, or GCC185), forming parallel coiled-coil dimers; purified recombinant golgin-97 is 67% alpha-helical by CD spectroscopy, consistent with an extended rod-like homodimeric structure.\",\n      \"method\": \"Co-immunoprecipitation of epitope-tagged proteins; chemical cross-linking; yeast two-hybrid; CD spectroscopy of purified recombinant protein\",\n      \"journal\": \"Biochemical Journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple orthogonal methods (co-IP, cross-linking, yeast two-hybrid, biophysical spectroscopy) in single study\",\n      \"pmids\": [\"15654769\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Golgin-97 selectively associates with TGN-derived tubulovesicular carriers containing E-cadherin; siRNA knockdown of golgin-97 inhibits E-cadherin trafficking from the TGN, identifying golgin-97 as an essential and selective component for E-cadherin export from the TGN.\",\n      \"method\": \"Live-cell fluorescence microscopy with GFP-tagged GRIP domains; siRNA knockdown; co-localization of GRIP domain with E-cadherin-GFP in tubular carriers\",\n      \"journal\": \"Traffic\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA knockdown with specific cargo trafficking readout plus live imaging, two orthogonal approaches in single lab\",\n      \"pmids\": [\"16262725\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Three-tier hierarchical interactions govern Golgi targeting of golgin-97 GRIP domain: (1) GRIP domain self-dimerization is required for (2) bivalent interaction with Arl1-GTP, and (3) a third group of residues including positively charged arginine between α1 and α2 helices and hydrophobic residues C-terminal to the GRIP domain (e.g. W744) mediate direct membrane lipid interaction, as shown by surface plasmon resonance.\",\n      \"method\": \"Mutational analysis of >30 GRIP domain mutants; surface plasmon resonance for lipid binding; in vivo targeting assays\",\n      \"journal\": \"Traffic\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro biophysical assay (SPR) combined with extensive mutagenesis and in vivo targeting readout, single lab\",\n      \"pmids\": [\"16899086\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"FIP1/RCP (a Rab11 effector) directly binds to golgin-97, with the binding domain mapping to the C-terminus of golgin-97 adjacent to its GRIP domain. This interaction does not affect golgin-97 TGN recruitment but is required for tethering/fusion of recycling endosome-derived retrograde transport vesicles to the TGN, as assayed by TGN38 and Shiga toxin retrograde trafficking.\",\n      \"method\": \"Proteomic identification by mass spectrometry; co-immunoprecipitation; fluorescence and electron microscopy; functional retrograde transport assays (TGN38, STxB)\",\n      \"journal\": \"Molecular Biology of the Cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MS identification plus co-IP plus functional transport assay, single lab\",\n      \"pmids\": [\"20610657\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"A short N-terminal 20–50 residue region of golgin-97 is necessary and sufficient to capture endosome-to-Golgi transport carriers when relocated to an ectopic location. Golgin-97 and golgin-245 share a closely related N-terminal capture motif distinct from that of GCC88, indicating they capture a specific class of endosome-derived carriers.\",\n      \"method\": \"Ectopic golgin relocation assay; systematic N-terminal truncation and motif mapping; vesicle accumulation quantification\",\n      \"journal\": \"BMC Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ectopic relocation functional assay with deletion mapping across six golgins, systematic approach in single lab\",\n      \"pmids\": [\"28122620\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TBC1D23 acts as a bridging adaptor between golgin-97 (and golgin-245) and endosome-derived vesicles: its Rab GAP domain binds to a conserved motif at the tip (N-terminus) of golgin-97 and golgin-245 at the trans-Golgi, while its C-terminus binds to the WASH complex on endosomal vesicles, thereby conferring specificity to endosome-to-Golgi trafficking.\",\n      \"method\": \"Proximity biotinylation (BioID) of golgin-captured vesicles; co-immunoprecipitation; siRNA knockdown with trafficking assay; ectopic golgin relocation system\",\n      \"journal\": \"Nature Cell Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — proximity biotinylation plus co-IP plus functional trafficking assay, multiple orthogonal methods, single lab with rigorous controls\",\n      \"pmids\": [\"29084197\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Crystal structure of TBC1D23 N-terminus reveals the rhodanese domain packs against the TBC domain and together they form the platform that interacts with golgin-97 and golgin-245; the rhodanese domain is structurally inactive as a sulfurtransferase/phosphatase, and disrupting golgin-97/245-binding (but not the putative catalytic site) impairs neuronal growth and brain development in zebrafish.\",\n      \"method\": \"X-ray crystallography; zebrafish in vivo model; structure-guided mutagenesis\",\n      \"journal\": \"PLoS Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure plus functional in vivo validation with structure-guided mutations in single study\",\n      \"pmids\": [\"32453802\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Hydrogen peroxide treatment causes degradation of Arl1 and consequent dissociation of golgin-97 (and golgin-245) from the trans-Golgi, with loss of trans-Golgi cisternae and inhibition of both anterograde and retrograde protein transport, identifying Arl1 as essential for golgin-97 membrane retention.\",\n      \"method\": \"Immunofluorescence; Western blotting; pharmacological H2O2 treatment; rescue with ROS scavenger N-acetyl cysteine and protease inhibitors; protein transport assays\",\n      \"journal\": \"Molecular Biology of the Cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple methods (IF, WB, functional transport assay, pharmacological rescue), single lab\",\n      \"pmids\": [\"32583744\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"PARP12 mono-ADP-ribosylates golgin-97 at an acidic cluster in its coiled-coil domain; this modification is required for E-cadherin and VSVG (but not TNFα/golgin-245-dependent cargo) export from TGN to plasma membrane. PARP12 depletion or mutation of the acidic cluster causes defective carrier fission and cargo accumulation in a trans-Golgi/Rab11-positive intermediate. PARP12's catalytic activity is activated by PKD-mediated direct phosphorylation of PARP12.\",\n      \"method\": \"In vitro ADP-ribosylation assay; site-directed mutagenesis of acidic cluster; siRNA knockdown; live-cell imaging of cargo trafficking; co-immunoprecipitation\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro enzymatic assay plus mutagenesis plus siRNA loss-of-function with specific cargo trafficking readout, multiple orthogonal methods in single study\",\n      \"pmids\": [\"34969853\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Golgin-97 knockdown in breast cancer cells activates NF-κB by reducing IκBα protein levels, promoting invasion-related gene expression; re-expression of golgin-97 restores IκBα and suppresses NF-κB activity. Both TGN-bound and cytosolic forms of golgin-97 inhibit NF-κB, and this function is independent of general Golgi integrity.\",\n      \"method\": \"siRNA knockdown; golgin-97 re-expression; subcellular fractionation; luciferase reporter assay; Western blotting; immunofluorescence\",\n      \"journal\": \"Cell Communication and Signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple methods (knockdown/rescue, reporter assay, fractionation), single lab\",\n      \"pmids\": [\"29703230\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TBC1D23 (bound to golgin-97 via its N-terminal domain) captures endosome-to-Golgi vesicles by directly recognizing a threonine-leucine-tyrosine (TLY) acidic-cluster motif present in cargo proteins (carboxypeptidase D, syntaxin-16, and other endosome-to-Golgi cargos) carried within those vesicles; a crystal structure of TBC1D23 C-terminal domain bound to the acidic TLY motif was determined, and structure-guided mutations that disrupt motif binding in vitro also block vesicle capture in vivo.\",\n      \"method\": \"Protein binding assays; X-ray crystallography; structure-guided mutagenesis; in vivo vesicle capture assay\",\n      \"journal\": \"Science Advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure plus structure-guided mutagenesis validated in vivo, multiple orthogonal methods in single study\",\n      \"pmids\": [\"38552021\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"During poxvirus infection, golgin-97 is transported from the TGN to viral replication/assembly sites (viral factories) and incorporated into mature virions, where it associates with the insoluble core protein fraction; siRNA depletion of golgin-97 blocks formation of mature virus (first infectious form) but not its precursor immature virus, demonstrating a role in viral morphogenesis/core maturation.\",\n      \"method\": \"Immunofluorescence; Western blotting of virion fractions; RNA interference knockdown; electron microscopy of virion morphology\",\n      \"journal\": \"Journal of Virology / Virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA loss-of-function with specific virion morphogenesis readout plus virion fractionation, reported across two papers from same lab\",\n      \"pmids\": [\"16987983\", \"17276477\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Golgin-97 directly binds the cytoplasmic domain of the inward rectifying potassium channel Kir2.1 via its GRIP domain (shown by in vitro protein interaction); siRNA knockdown of golgin-97 prevents exit of Kir2.1 from the Golgi, identifying golgin-97 as required for targeting Kir2.1 to the TGN and its subsequent AP-1-dependent export.\",\n      \"method\": \"Systematic screen of Golgi tethers; in vitro protein-interaction pull-down assay; RNA interference knockdown; fluorescence imaging\",\n      \"journal\": \"Frontiers in Physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro direct binding assay plus siRNA functional readout, single lab\",\n      \"pmids\": [\"30123141\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Retromer-dependent retrograde trafficking of CI-M6PR uses transport carriers tethered specifically by GCC88, not by golgin-97 or golgin-245, demonstrating that golgin-97 is not required for CI-M6PR retrograde transport.\",\n      \"method\": \"Vps35 knockout; electron microscopy; vesicle tethering assay with specific golgin markers\",\n      \"journal\": \"Journal of Cell Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — negative result for golgin-97 established by knockout plus EM-based vesicle cargo analysis, single lab\",\n      \"pmids\": [\"30559172\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Overexpression of isolated GRIP domain fragments of golgin-97 (or tGolgin-1) alters TGN organization, inhibits vesicular transport from TGN to plasma membrane, inhibits furin-dependent substrate cleavage, and causes mislocalization of TGN46 to multivesicular late endosomes; a conserved GRIP domain tyrosine mutation abolishes these effects.\",\n      \"method\": \"Semi-quantitative immunofluorescence; GRIP domain overexpression; electron microscopy; vesicular transport assay; mutagenesis\",\n      \"journal\": \"Journal of Cell Science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — dominant-negative overexpression with multiple functional readouts plus mutagenesis, single lab\",\n      \"pmids\": [\"13130094\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Golgin-97 is a trans-Golgi network (TGN)-localized coiled-coil tethering protein that is recruited to the TGN via a C-terminal GRIP domain, which dimerizes, binds activated Arl1 GTPase (itself activated by ARFRP1), and directly contacts membrane lipids; at the TGN it captures endosome-derived transport vesicles through its N-terminal motif by serving as a docking site for TBC1D23, which in turn recognizes a cargo-encoded acidic TLY motif on the incoming vesicles, and it selectively promotes export of specific basolateral cargoes (e.g., E-cadherin, Kir2.1) via a mechanism regulated by PARP12-mediated mono-ADP-ribosylation downstream of PKD activation, while also suppressing NF-κB activity independently of its Golgi localization.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"Golgin-97 (GOLGA1) is a trans-Golgi network (TGN) coiled-coil tethering protein that captures endosome- and recycling-endosome-derived transport carriers and promotes selective export of basolateral cargoes from the TGN [#9, #6]. It is recruited to the TGN through a C-terminal ~50-residue GRIP domain that is necessary and sufficient for Golgi targeting [#0, #2]; targeting requires a three-tier hierarchy in which the GRIP domain first self-dimerizes, then bivalently engages the activated GTPase Arl1, and finally contacts membrane lipids directly through basic and hydrophobic residues flanking the domain [#7, #5]. Arl1 itself depends on the upstream regulator ARFRP1 for its own Golgi localization, placing golgin-97 at the bottom of an ARFRP1\\u2192Arl1\\u2192golgin-97 recruitment cascade that governs both anterograde and retrograde TGN transport [#4]; Arl1 stability is required continuously, as its oxidative degradation strips golgin-97 from the membrane [#12]. At its exposed N-terminus, a short capture motif shared with golgin-245 docks incoming vesicles via the bridging adaptor TBC1D23, whose rhodanese-TBC platform binds the golgin tip while its C-terminal domain engages the WASH complex on endosomal vesicles and recognizes an acidic TLY cargo motif, thereby conferring endosome-to-Golgi specificity [#9, #10, #15, #11]. Golgin-97 selectively mediates TGN export of E-cadherin and the potassium channel Kir2.1, the latter through direct GRIP-domain binding, and its E-cadherin/VSVG export function is gated by PARP12-mediated mono-ADP-ribosylation of an acidic cluster in its coiled-coil, downstream of PKD activation [#6, #17, #13]. Independently of its Golgi role, golgin-97 suppresses NF-\\u03baB activity by maintaining I\\u03baB\\u03b1 levels, a function exhibited by both membrane-bound and cytosolic pools [#14].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Establishing how golgin-97 reaches the Golgi, the C-terminal GRIP domain was defined as a transferable, self-contained Golgi-targeting determinant and the conserved aromatic/tyrosine residues required for it were mapped.\",\n      \"evidence\": \"GFP-GRIP fusion targeting, site-directed mutagenesis, and competitive displacement in mammalian cells\",\n      \"pmids\": [\"10209120\", \"10209123\", \"10209125\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the membrane determinant the GRIP domain recognizes\", \"Rab6 binding on blots was later superseded by Arl1 as the primary targeting GTPase\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Dominant-negative GRIP-domain overexpression showed golgin-97 is functionally required for TGN-to-plasma-membrane transport and TGN organization, moving it from a localization marker to a trafficking effector.\",\n      \"evidence\": \"Isolated GRIP-domain overexpression with EM, transport and furin-cleavage assays, and a tyrosine mutant control\",\n      \"pmids\": [\"13130094\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Overexpression of an isolated fragment may act non-physiologically\", \"No direct cargo or vesicle partner identified\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"The targeting GTPase and the upstream cascade were resolved: Arl1-GTP recruits golgin-97 via the GRIP domain, and ARFRP1 is required upstream to position Arl1, distinguishing golgin-97 from Arl1-independent GRIP golgins.\",\n      \"evidence\": \"Co-IP, in vivo GRIP overexpression and colocalization, plus siRNA of ARFRP1 with VSV-G and Shiga toxin transport assays\",\n      \"pmids\": [\"15522892\", \"16129887\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Quantitative contribution of lipid vs GTPase binding not separated here\", \"Did not define the captured vesicle class\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Biophysical characterization established golgin-97 as an extended parallel coiled-coil homodimer, explaining how a single golgin presents a long tether without cross-pairing with other GRIP proteins.\",\n      \"evidence\": \"Co-IP, chemical cross-linking, yeast two-hybrid, and CD spectroscopy of recombinant protein\",\n      \"pmids\": [\"15654769\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No full-length structure\", \"Stoichiometry of dimer engagement with Arl1 not resolved\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"The first specific cargo was identified, showing golgin-97 is not a generic tether but selectively required for E-cadherin export in TGN-derived tubulovesicular carriers.\",\n      \"evidence\": \"Live imaging of GFP-tagged carriers plus siRNA knockdown with E-cadherin trafficking readout\",\n      \"pmids\": [\"16262725\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism linking golgin-97 to the E-cadherin carrier not defined\", \"Direct vs indirect cargo selection unclear at this stage\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"The molecular logic of GRIP targeting was resolved into a three-tier hierarchy (dimerization, bivalent Arl1-GTP binding, direct lipid contact), integrating the earlier mutagenesis and GTPase data into one mechanism.\",\n      \"evidence\": \"Mutational analysis of >30 GRIP mutants with SPR lipid binding and in vivo targeting assays\",\n      \"pmids\": [\"16899086\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Lipid identity recognized by basic/hydrophobic residues not specified\", \"Did not address N-terminal vesicle-capture function\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"A non-canonical role emerged in poxvirus morphogenesis, where golgin-97 is rerouted to viral factories and required for mature virion formation.\",\n      \"evidence\": \"Immunofluorescence, virion fractionation, siRNA depletion and EM of virion morphology\",\n      \"pmids\": [\"16987983\", \"17276477\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which golgin-97 contributes to core maturation unknown\", \"Relationship to its TGN tethering function unclear\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identification of the Rab11 effector FIP1/RCP as a C-terminal partner provided a molecular link for tethering recycling-endosome-derived retrograde carriers, separate from the GRIP recruitment function.\",\n      \"evidence\": \"MS identification, co-IP, EM, and TGN38/Shiga toxin retrograde transport assays\",\n      \"pmids\": [\"20610657\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs adaptor-mediated binding not fully resolved\", \"Single lab, not reciprocally cross-validated against later TBC1D23 model\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"The N-terminal capture motif and its adaptor were defined, showing a short tip region is necessary and sufficient to capture a specific endosome-derived carrier class via the bridging adaptor TBC1D23, which links the golgin tip to the WASH complex.\",\n      \"evidence\": \"Ectopic golgin relocation, N-terminal truncation mapping, BioID, co-IP and siRNA trafficking assays across multiple golgins\",\n      \"pmids\": [\"28122620\", \"29084197\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How TBC1D23 distinguishes correct vesicles at the molecular level not yet shown\", \"Physiological cargo of these carriers not enumerated here\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Cargo selectivity was sharpened by positive and negative results: golgin-97 directly binds and exports Kir2.1, but is dispensable for retromer-dependent CI-M6PR retrograde transport, which uses GCC88.\",\n      \"evidence\": \"Golgi-tether screen with in vitro pull-downs and siRNA for Kir2.1; Vps35 knockout with EM golgin-marker tethering for CI-M6PR\",\n      \"pmids\": [\"30123141\", \"30559172\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis of Kir2.1 GRIP-domain binding not determined\", \"Full cargo repertoire of golgin-97 vs sibling golgins incomplete\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"A Golgi-independent signaling role was uncovered: golgin-97 suppresses NF-\\u03baB by maintaining I\\u03baB\\u03b1, linking its loss to breast cancer invasion.\",\n      \"evidence\": \"siRNA knockdown/re-expression, fractionation, luciferase reporter and Western blot in breast cancer cells\",\n      \"pmids\": [\"29703230\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular mechanism by which golgin-97 stabilizes I\\u03baB\\u03b1 unknown\", \"Direct binding partners in the NF-\\u03baB axis not identified\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Structural and stability mechanisms were added: the TBC1D23 rhodanese-TBC platform was shown to form the golgin-binding surface (catalytically inactive), and Arl1 was shown to be continuously required, as its oxidative degradation releases golgin-97 from the membrane.\",\n      \"evidence\": \"X-ray crystallography with zebrafish neurodevelopment assay; H2O2 treatment with NAC/protease-inhibitor rescue and transport assays\",\n      \"pmids\": [\"32453802\", \"32583744\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether oxidative regulation of golgin-97 occurs physiologically not established\", \"Functional consequence of golgin-97 binding in neurodevelopment via TBC1D23 vs golgin-97 itself not separated\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"A post-translational regulatory layer was defined: PKD-activated PARP12 mono-ADP-ribosylates an acidic cluster in golgin-97's coiled-coil, gating carrier fission and E-cadherin/VSVG export.\",\n      \"evidence\": \"In vitro ADP-ribosylation, acidic-cluster mutagenesis, siRNA, live-cell cargo imaging and co-IP\",\n      \"pmids\": [\"34969853\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How the modification mechanically drives carrier fission unknown\", \"Why golgin-245-dependent cargo is exempt not explained\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Cargo recognition at the carrier level was resolved structurally: TBC1D23's C-terminal domain directly reads an acidic TLY motif on endosome-to-Golgi cargoes, completing the chain from golgin tip to specific cargo.\",\n      \"evidence\": \"Protein binding assays, X-ray crystallography of TBC1D23-CTD bound to the TLY motif, and structure-guided mutagenesis with in vivo capture assay\",\n      \"pmids\": [\"38552021\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Generality of the TLY code across the full cargo set not exhaustively mapped\", \"How motif recognition is coordinated with WASH-complex binding not resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unknown how golgin-97's distinct activities\\u2014TGN vesicle tethering, selective basolateral cargo export, and Golgi-independent NF-\\u03baB suppression\\u2014are integrated and switched within a single cell, and whether the protein has a defined Mendelian disease association.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model of full-length dimer engaging Arl1 and a vesicle simultaneously\", \"Mechanism of cytosolic golgin-97 pool and its NF-\\u03baB function uncharacterized\", \"No direct evidence linking GOLGA1 to a human disease in the corpus\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [9, 10, 6]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [7]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [0, 3, 5]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [14]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [6, 9, 10]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [4, 6, 17]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [14]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"ARL1\", \"ARFRP1\", \"TBC1D23\", \"RAB11FIP1\", \"PARP12\", \"KCNJ2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}