{"gene":"ABHD5","run_date":"2026-06-09T22:02:37","timeline":{"discoveries":[{"year":2006,"finding":"CGI-58/ABHD5 directly interacts with and activates adipose triglyceride lipase (ATGL), stimulating its TG hydrolase activity up to 20-fold. CDS-associated CGI-58 point mutations fail to activate ATGL. CGI-58/ATGL co-expression attenuates lipid accumulation in COS-7 cells, and antisense-mediated CGI-58 knockdown in 3T3-L1 adipocytes inhibits TG mobilization. Expression of functional CGI-58 in CDS fibroblasts restores lipolysis.","method":"Co-expression in COS-7 cells, in vitro TG hydrolase activity assays, antisense RNA knockdown in 3T3-L1 adipocytes, complementation in CDS patient fibroblasts, point-mutation analysis","journal":"Cell metabolism","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal methods (in vitro assay, mutagenesis, cell-based complementation, KD with defined phenotype), replicated across several cell systems in one rigorous study","pmids":["16679289"],"is_preprint":false},{"year":2001,"finding":"Mutations in CGI-58 (ABHD5) cause Chanarin-Dorfman syndrome; the CGI-58 protein belongs to the alpha/beta-hydrolase fold family and contains a catalytic triad of the esterase/lipase/thioesterase subfamily, but with asparagine replacing the usual catalytic serine, indicating an atypical or absent classical hydrolase activity.","method":"Positional cloning, mutation screening in CDS patients, sequence analysis of protein domain structure","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic linkage, mutation identification in multiple families, bioinformatic domain analysis; foundational gene-disease link with structural annotation","pmids":["11590543"],"is_preprint":false},{"year":2004,"finding":"CGI-58 localizes to lipid droplet surfaces in differentiated 3T3-L1 adipocytes via interaction with perilipin A. The C-terminal sequence (aa 382-429) of perilipin A is required for CGI-58 binding. PKA activation by isoproterenol disperses CGI-58 from lipid droplets to the cytoplasm in a reversible manner. CDS-associated CGI-58 mutants fail to localize to lipid droplets.","method":"Proteomics identification, CGI-58-GFP localization in adipocytes, perilipin deletion mutants, immunoprecipitation, isoproterenol/PKA stimulation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, GFP live imaging, deletion mutagenesis, pharmacological manipulation, replicated with both endogenous and ectopic protein","pmids":["15292255"],"is_preprint":false},{"year":2004,"finding":"CGI-58 directly interacts with perilipin in a yeast two-hybrid assay and co-localizes to lipid droplet surfaces. CDS-associated CGI-58 mutations (amino acid substitutions) abolish perilipin binding and lipid droplet recruitment. CGI-58 also interacts with ADRP (perilipin-2) and co-localizes with ADRP-coated lipid droplets in non-differentiated cells.","method":"Yeast two-hybrid, GFP fusion co-localization, loss-of-function CDS mutants","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — yeast two-hybrid and GFP co-localization (not reciprocal Co-IP in mammalian cells), but multiple interacting partners tested and CDS mutants validate functional relevance","pmids":["15136565"],"is_preprint":false},{"year":2007,"finding":"CGI-58 knockdown in 3T3-L1 preadipocytes and Hepa1 hepatoma cells causes abnormal LD accumulation and reduces basal and PKA-stimulated lipolysis. In vitro, CGI-58 itself lacks lipase/esterase activity but enhances ATGL activity. Upon lipolytic stimulation, CGI-58 disperses from LDs to the cytosol, dependent on perilipin phosphorylation (phosphorylated perilipin loses CGI-58 binding).","method":"siRNA knockdown, in vitro lipase assay, lipolysis assays, live-cell imaging of CGI-58 redistribution","journal":"Journal of lipid research","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro activity assay (no lipase activity), knockdown with defined phenotype, mechanistic live-cell imaging, single lab with multiple orthogonal methods","pmids":["17308334"],"is_preprint":false},{"year":2008,"finding":"Recombinant human CGI-58, purified from E. coli, catalyzes acyl-CoA-dependent acylation of lysophosphatidic acid (LPA) to phosphatidic acid (PA). The enzyme does not acylate other lysophospholipids or neutral glycerolipid acceptors. Overexpression of CGI-58 in yeast increases PA and total phospholipids while reducing TG levels. Endogenous CGI-58 is the LPA acyltransferase in mouse white adipose tissue lipid droplets.","method":"Recombinant protein purification from E. coli, in vitro acyltransferase assay, overexpression in S. cerevisiae, immunoblot and mass spectrometry in mouse adipose tissue","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with purified recombinant protein, multiple substrate specificity assays, in vivo yeast validation, single lab","pmids":["18606822"],"is_preprint":false},{"year":2009,"finding":"Perilipin (Plin) binds ABHD5 with high affinity and sequesters it, thereby suppressing ABHD5 interaction with ATGL and reducing basal lipolysis. PKA-mediated phosphorylation of Plin on Ser492 or Ser517 rapidly releases ABHD5 from Plin, allowing ABHD5 to directly interact with ATGL predominantly on lipid droplets containing Plin.","method":"FRET/protein trafficking in live cells (3T3-L1 adipocytes), bimolecular fluorescence complementation, phosphorylation site mutagenesis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — live-cell fluorescence imaging with multiple mutants, phosphorylation site mapping, defined functional consequence (lipolysis control), single lab with multiple orthogonal approaches","pmids":["19850935"],"is_preprint":false},{"year":2009,"finding":"Recombinant mouse CGI-58 expressed in E. coli displays acyl-CoA-dependent lysophosphatidic acid acyltransferase (LPAAT) activity, with preference for arachidonoyl-CoA and oleoyl-CoA as acyl donors and 1-oleoyl-LPA as acceptor. CGI-58 contains a conserved HXXXXD motif consistent with acyltransferase function. Expression of CGI-58 in CDS fibroblasts increases incorporation of fatty acids released from stored TG into phospholipids.","method":"Recombinant protein expression in E. coli, in vitro LPAAT assay with substrate specificity, fluorescence quenching, radiotracer lipid incorporation in fibroblasts","journal":"Journal of lipid research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with purified protein, substrate specificity panel, disease fibroblast complementation, single lab with multiple orthogonal methods","pmids":["19801371"],"is_preprint":false},{"year":2009,"finding":"CGI-58-deficient (Cgi-58−/−) mice display systemic TG accumulation, severe hepatic steatosis, and a lethal neonatal skin permeability barrier defect. The skin barrier defect is linked to impaired epidermal TG hydrolysis and consequent failure to synthesize acylceramides, revealing an ATGL-independent function of CGI-58 in skin lipid metabolism.","method":"Constitutive mouse knockout, lipid analysis, histology, metabolic measurements","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO mouse with multiple defined cellular and biochemical phenotypes, biochemically distinguishes ATGL-dependent and ATGL-independent CGI-58 functions","pmids":["20023287"],"is_preprint":false},{"year":2008,"finding":"ABHD5 interacts with Mldp (LSDP5/PLIN5) on the surface of lipid droplets in cardiac muscle, directing ABHD5 to those droplets in proportion to Mldp concentration. An ABHD5 E262K mutant with reduced Mldp binding fails to support Atgl activity at Mldp-containing lipid droplets, despite Atgl being present, demonstrating that the ABHD5-Mldp interaction is required for Atgl activation in this context.","method":"Co-IP in situ, fluorescence co-localization in cardiac muscle fibers and transfected fibroblasts, point-mutant ABHD5 E262K functional analysis, oleic acid loading, lipid droplet assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — protein-protein interaction validated in situ and in cells with loss-of-function mutant, functional lipid droplet assay, single lab with multiple orthogonal methods","pmids":["19064991"],"is_preprint":false},{"year":2010,"finding":"The N-terminal tryptophan-rich region (aa 1-30) of CGI-58 is required for lipid droplet binding and for ATGL activation. NMR experiments demonstrate strong interaction between the N-terminal peptide and dodecylphosphocholine micelles (lipid droplet mimic). N-terminally truncated CGI-58 localizes to the cytoplasm and loses ability to stimulate ATGL, linking correct localization to activating function.","method":"1H NMR with lipid-droplet-mimicking micelles, GFP-fusion localization, deletion mutants in cell culture, ATGL activation assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — NMR structural data combined with cell-based localization and functional activity assay, mutagenesis, single lab","pmids":["20164531"],"is_preprint":false},{"year":2011,"finding":"Human PLIN1 C-terminal frameshift mutations (Leu-404fs, Val-398fs) fail to bind ABHD5, causing constitutive ABHD5-mediated coactivation of ATGL and elevated basal lipolysis. siRNA knockdown of either ABHD5 or ATGL in cells expressing mutant PLIN1 reduces basal lipolysis, placing ABHD5 between PLIN1 and ATGL in the lipolytic signaling hierarchy.","method":"Bimolecular fluorescence complementation (BiFC), siRNA knockdown, basal lipolysis assay in preadipocytes","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — BiFC assay demonstrates direct protein interaction failure, epistasis via siRNA rescue confirms pathway order, validated with naturally occurring human mutations","pmids":["21757733"],"is_preprint":false},{"year":2011,"finding":"The minimal active domain of ATGL (aa 1-254) retains both TG hydrolase activity and the capacity to be coactivated by CGI-58 and inhibited by G0S2, establishing that the CGI-58 interaction interface is within this minimal patatin-domain fragment. G0S2 inhibits ATGL independently of CGI-58 and regardless of ATGL activity state.","method":"Domain truncation, in vitro TG hydrolase assay, co-IP with CGI-58 and G0S2, 3D homology modeling","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro assay with deletion series and co-IP, single lab, defines interaction domain but no mutagenesis of binding residues","pmids":["22039468"],"is_preprint":false},{"year":2014,"finding":"CGI-58 is phosphorylated by PKA on Ser239 in mouse (Ser237 in human). Phosphorylation of Ser239 is required for dispersion of CGI-58 from PLIN1-coated lipid droplets upon PKA activation, thereby increasing CGI-58 availability for ATGL coactivation. Phosphorylation of CGI-58 itself neither increases nor impairs in vitro ATGL coactivation; perilipin phosphorylation also contributes to CGI-58 dispersion.","method":"Phosphoamino acid analysis, mass spectrometry, immunoblotting of recombinant and endogenous CGI-58, S239A/S240A mutagenesis, subcellular localization in adipocytes, in vitro ATGL coactivation assay","journal":"Journal of lipid research","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — three orthogonal methods to identify phosphorylation site, mutagenesis defines functional consequence on localization, in vitro assay tests activity, single rigorous study","pmids":["25421061"],"is_preprint":false},{"year":2015,"finding":"Synthetic ligands directly bind ABHD5 (confirmed by affinity probe labeling and molecular imaging), releasing ABHD5 from PLIN1 or PLIN5 without PKA activation, thereby rapidly activating adipocyte and muscle lipolysis. Endogenous ligands including long-chain acyl-CoA also regulate ABHD5-PLIN interactions.","method":"Synthetic ligand screen, affinity probe labeling, molecular imaging (FRET/BiFC), lipolysis assays in 3T3-L1 adipocytes and muscle cells","journal":"Cell metabolism","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct target engagement (affinity probe), functional lipolysis readout, mechanistic dissection of PLIN-ABHD5 interaction, multiple cell types, multiple orthogonal methods","pmids":["26411340"],"is_preprint":false},{"year":2015,"finding":"The NMR solution structure of the CGI-58 N-terminal lipid-droplet anchor peptide (residues 10-31) bound to DPC micelles reveals that Trp21/Trp25 form one anchor arm and Trp29 forms an independent second arm. Simultaneous Trp-to-Ala substitutions in both arms abolish CGI-58 lipid droplet localization and ATGL-activating function, while single-arm substitutions do not.","method":"Solution NMR structure of N-terminal peptide with DPC micelles, Trp-to-Ala mutagenesis, cell-based localization and ATGL activation assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — NMR structure with functional validation by mutagenesis and cell-based assays, single lab but multiple orthogonal methods","pmids":["26350461"],"is_preprint":false},{"year":2014,"finding":"Perilipin 1 C-terminus binds ABHD5 and stabilizes it by retarding its proteasomal degradation; perilipins 2 and 3 lack this C-terminal domain and thus sequester ABHD5 less effectively, resulting in higher rates of basal lipolysis in non-adipose tissues. Chimeric proteins with PLIN1 C-terminus fused to PLIN2/3 N-terminus stabilize ABHD5 and suppress basal lipolysis.","method":"BiFC assays, chimeric perilipin constructs, perilipin knockdown in adipocytes, proteasome inhibition experiments, basal lipolysis measurement","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — BiFC interaction assays, chimeric protein rescue, proteasome inhibition, KD with defined phenotype, multiple orthogonal approaches in one study","pmids":["24927580"],"is_preprint":false},{"year":2016,"finding":"Two conserved ABHD5 residues (R299 and G328) are required for ATGL activation. Introducing equivalent residues into the paralog ABHD4 (N303R/S332G) confers ATGL-activating ability. Corresponding mutations in ABHD5 (R299N, G328S) selectively disrupt lipolysis without affecting ATGL lipid droplet translocation, PLIN binding, or ligand interactions, defining a novel functional surface on ABHD5 for lipase activation.","method":"Comparative evolutionary analysis, gain-of-function mutagenesis of ABHD4, loss-of-function mutagenesis of ABHD5, ATGL activation assays in Cos7 cells/brown adipocytes/artificial lipid droplets, structural modeling","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — gain-of-function and loss-of-function mutagenesis across multiple assay systems, functional dissociation of ATGL activation from other ABHD5 activities","pmids":["28211464"],"is_preprint":false},{"year":2018,"finding":"ABHD5 directly interacts with PNPLA1 and recruits it to lipid droplets, stimulating PNPLA1-catalyzed ω-O-acylceramide (AcylCer) biosynthesis essential for skin barrier formation. ABHD5 mutations associated with ichthyosis in Chanarin-Dorfman syndrome fail to accelerate PNPLA1-mediated AcylCer production.","method":"Co-expression in AcylCer-producing cell system, immunofluorescence and immunoelectron microscopy, loss-of-function CDS mutants, lipid analysis","journal":"Journal of lipid research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — protein interaction, functional lipid synthesis assay, CDS mutant validation, multiple imaging modalities, single lab","pmids":["30361410"],"is_preprint":false},{"year":2018,"finding":"ABHD5 stimulates PNPLA1-catalyzed acylceramide synthesis; co-expression causes PNPLA1 to relocalize from dispersed to lipid-droplet membranes, and at high expression levels leads to lipid droplet morphological transformation into vesicles or ER incorporation. CDS-associated ABHD5 mutations reduce this ability.","method":"Indirect immunofluorescence microscopy, immunoelectron microscopy, acylceramide production assay in HeLa cells, CDS mutant analysis","journal":"Journal of dermatological science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — imaging and functional assay in one lab, consistent with companion paper (PMID 30361410), single lab","pmids":["30527376"],"is_preprint":false},{"year":2019,"finding":"ABHD5 functions as a serine protease that cleaves HDAC4 in vitro and in vivo, generating an N-terminal HDAC4 polypeptide (HDAC4-NT) that inhibits MEF2-dependent gene expression and controls glucose handling. ABHD5 deficiency leads to cardiac lipid accumulation; cardiac gene therapy with HDAC4-NT prevents heart failure without preventing lipid accumulation, separating lipotoxicity from functional cardiac protection.","method":"In vitro proteolysis assay, in vivo mouse cardiac gene therapy, MEF2 reporter assay, pressure-overload heart failure model, ABHD5 overexpression in transgenic mice","journal":"Nature metabolism","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro and in vivo protease activity, genetic rescue with defined substrate cleavage product, multiple mouse models, direct mechanistic dissection of lipid versus signaling functions","pmids":["31742248"],"is_preprint":false},{"year":2019,"finding":"PNPLA3 (WT and I148M) interacts directly with CGI-58; co-immunoprecipitation and pulldown with purified proteins from mouse livers confirm this interaction. PNPLA3 requires CGI-58 for its localization to hepatic lipid droplets, and overexpression of PNPLA3(148M) increases hepatic TG in WT but not in liver-specific Cgi-58 KO mice, establishing that the pro-steatotic effect of PNPLA3(148M) requires CGI-58.","method":"Co-immunoprecipitation in mouse livers, in vitro pulldown with purified proteins, liver-specific CGI-58 KO mice, CGI-58 dependent PNPLA3 localization","journal":"Hepatology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — reciprocal Co-IP, in vitro pulldown with purified proteins, and genetic epistasis (KO mouse), multiple orthogonal methods in one study","pmids":["30802989"],"is_preprint":false},{"year":2016,"finding":"CGI-58 knockdown causes hepatic steatosis in mice both with and without ATGL, demonstrating that CGI-58 regulates hepatic TG and diacylglycerol accumulation, and hepatic inflammation, via ATGL-independent mechanisms. ATGL deficiency (but not CGI-58 deficiency) suppresses the hepatic de novo lipogenic program.","method":"Mice with single and double deficiency of CGI-58 and ATGL (direct genetic comparison), lipid analysis, gene expression profiling","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct epistasis via double-KO mouse comparison, defined biochemical and transcriptional phenotypes, mechanistically distinguishes CGI-58 and ATGL functions","pmids":["27396333"],"is_preprint":false},{"year":2013,"finding":"CGI-58 knockdown in mice sequesters diacylglycerols (DAG) in lipid droplets/ER rather than the plasma membrane, preventing PKCε translocation to the plasma membrane and thereby dissociating DAG accumulation from hepatic insulin resistance.","method":"Antisense oligonucleotide knockdown in mice, hyperinsulinemic-euglycemic clamp, subcellular DAG fractionation, PKCε membrane translocation assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo KD with clamp studies, subcellular fractionation, kinase translocation assay, multiple orthogonal methods defining mechanism","pmids":["23302688"],"is_preprint":false},{"year":2016,"finding":"ABHD5 directly interacts with BECN1 (Beclin 1) and competes with caspase-3 (CASP3) for binding at BECN1 cleavage sites, preventing CASP3-mediated BECN1 cleavage and inactivation, thereby sustaining autophagic flux. ABHD5 deficiency permits CASP3 to cleave BECN1, impairing autophagy independent of PNPLA2/ATGL.","method":"Co-IP, competitive binding assay, autophagic flux measurement, CASP3 cleavage assay, colorectal cancer cell lines and intestine-specific KO mouse model","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and competitive binding assay mechanistically defined, functional autophagy readout, single lab, moderate replication","pmids":["27559856"],"is_preprint":false},{"year":2016,"finding":"Macrophage ABHD5 suppresses spermidine synthase (SRM)-dependent spermidine production by inhibiting ROS-dependent expression of C/EBPε, which activates SRM transcription. ABHD5 expression in macrophages thereby reduces spermidine availability and potentiates CRC growth; additional SRM transgene in macrophages prevents ABHD5 transgene-induced CRC growth.","method":"In vitro macrophage-CRC co-culture, mouse xenograft and genetic cancer models, SRM transgene rescue experiment, ROS measurement, C/EBPε expression analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic rescue with SRM transgene demonstrates epistasis, in vitro mechanism (ROS-C/EBPε-SRM) validated by multiple models","pmids":["27189574"],"is_preprint":false},{"year":2021,"finding":"ABHD5 interacts in the cytoplasm with DPY30 (core subunit of SET1A methyltransferase complex), inhibiting DPY30 nuclear translocation and SET1A activity. ABHD5 loss allows DPY30 nuclear entry, enabling SET1A-mediated methylation of YAP and histone H3, sequestering YAP in the nucleus and promoting c-Met transcription to sustain CRC stemness.","method":"Co-IP for ABHD5-DPY30 interaction, nuclear fractionation, SET1A methyltransferase assay, YAP methylation assay, gene expression analysis, CRC cell and mouse models","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — protein interaction (Co-IP), subcellular fractionation, enzyme activity assay (methyltransferase), downstream YAP/c-Met phenotype, multiple orthogonal methods","pmids":["34795238"],"is_preprint":false},{"year":2020,"finding":"ABHD5-mediated lipolysis activates the AMPK/mTORC1 pathway by elevating intracellular AMP, leading to AMPK activation and mTORC1 inhibition, suppressing protein synthesis and cancer cell growth. This suppression requires fatty acid re-esterification (by DGAT1/DGAT2), which consumes ATP, creating a futile cycle between TG hydrolysis and resynthesis.","method":"ABHD5 overexpression and pharmacological lipolysis activation, AMP/ATP measurement, AMPK/mTORC1 signaling assays, DGAT1/2 inhibition, cell cycle analysis in prostate cancer cells","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — defined biochemical pathway with pharmacological and genetic interventions, single lab, multiple assays","pmids":["33219129"],"is_preprint":false},{"year":2014,"finding":"Recombinant CGI-58 catalyzes reacylation of lysophosphatidylglycerol to phosphatidylglycerol (PG) in an acyl-CoA-dependent manner, but lacks acyltransferase activity toward other lysophospholipids. Overexpression and knockdown of CGI-58 in C2C12 cells reciprocally affect endogenous PG levels, thereby altering cardiolipin availability and mitochondrial autophagy (mitophagy) through PINK1/AMPK/mTORC1 signaling.","method":"Recombinant protein from Sf9 cells, in vitro acyltransferase assay with substrate panel, overexpression/knockdown in C2C12 cells, lipid analysis, mitophagy and autophagy assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — in vitro reconstitution identifies novel substrate (LPG), cell-based validation, single lab","pmids":["25315780"],"is_preprint":false},{"year":2020,"finding":"ABHD5 cooperates with ATGL to mobilize lipid droplet-stored triglycerides required for HCV infectious particle production in hepatocytes. Specific ABHD5 residues critical for ATGL activation are required for both lipolytic and pro-viral functions; grafting these ABHD5 residues onto the paralog ABHD4 confers pro-viral and lipolytic activity. ABHD5 residues at the predicted ATGL interface are necessary for both functions.","method":"ATGL modulation (protein expression and lipase inhibitor), ABHD4 gain-of-function mutagenesis, ABHD5 loss-of-function mutagenesis, HCV production assay, lipid droplet lipolysis measurement","journal":"PLoS pathogens","confidence":"High","confidence_rationale":"Tier 2 / Strong — bidirectional mutagenesis (gain- and loss-of-function), functional lipolysis and viral production assays, mechanistically defines ABHD5-ATGL interface","pmids":["32542055"],"is_preprint":false},{"year":2014,"finding":"Macrophage-specific CGI-58 knockout causes mitochondrial dysfunction via defective PPARγ signaling, leading to ROS overproduction that activates NLRP3 inflammasome, potentiating proinflammatory cytokine secretion and aggravating HFD-induced insulin resistance. Anti-ROS treatment or NLRP3 silencing prevents cytokine oversecretion and insulin resistance in CGI-58-deficient macrophages.","method":"Macrophage-specific CGI-58 KO mice, mitochondrial function assays, ROS measurement, NLRP3 inflammasome activation, anti-ROS treatment, cytokine assays, co-culture with fat slices","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — tissue-specific KO with multiple mechanism-testing interventions (NLRP3 KD, anti-ROS), defined pathway, in vivo and in vitro validation","pmids":["24703845"],"is_preprint":false},{"year":2008,"finding":"CGI-58 is localized to lamellar granules in differentiated keratinocytes of the granular layer. CGI-58 knockdown reduces expression of keratinocyte differentiation/keratinization markers, indicating a role in keratinocyte differentiation and lamellar granule lipid metabolism for skin barrier formation.","method":"Immunoelectron microscopy of lamellar granules, immunohistochemistry of human epidermis, siRNA knockdown in cultured keratinocytes, organotypic 3D cultures","journal":"The American journal of pathology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ultrastructural localization by immunoelectron microscopy, functional knockdown with defined phenotype, single lab","pmids":["18832586"],"is_preprint":false},{"year":2025,"finding":"Lipid droplet targeting of ABHD5 is required for its interaction with PNPLA3 I148M. Fluorescence cross-correlation spectroscopy demonstrates that PNPLA3 I148M has greater association with ABHD5 on LDs than WT PNPLA3. PNPLA3 C-terminus is sufficient for LD targeting and ABHD5 interaction. LD targeting of PNPLA3 I148M is required to promote steatosis in vitro and in vivo.","method":"Fluorescence cross-correlation spectroscopy, molecular modeling, C-terminal domain truncation, in vitro steatosis assay, in vivo liver steatosis model","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biophysical interaction assay plus functional steatosis readout, single lab, extends prior findings (PMID 30802989)","pmids":["39814233"],"is_preprint":false},{"year":2010,"finding":"A short CGI-58 splice isoform (mCGI-58S), lacking exons 2 and 3, localizes predominantly to the cytoplasm (not lipid droplets), cannot activate ATGL, cannot promote lipid droplet turnover, but retains LPA acyltransferase activity, functionally dissociating ATGL activation from acyltransferase function.","method":"Cloning of alternative splice variant, GFP-fusion localization, ATGL activation assay, lipid droplet accumulation assay, LPA acyltransferase assay","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional dissection with naturally occurring isoform, multiple assays, single lab","pmids":["20083112"],"is_preprint":false}],"current_model":"ABHD5/CGI-58 is a multifunctional lipid droplet-associated protein that: (1) potently co-activates ATGL-mediated triacylglycerol hydrolysis via direct protein-protein interaction requiring specific surface residues (R299, G328) and N-terminal tryptophan-rich LD anchoring; (2) is regulated by reversible sequestration on lipid droplets through perilipin proteins (PLIN1/2/5), released upon PKA-mediated phosphorylation of both perilipin and ABHD5-Ser239; (3) possesses acyl-CoA-dependent lysophosphatidic acid (and lysophosphatidylglycerol) acyltransferase activity; (4) acts as a serine protease cleaving HDAC4 to regulate MEF2-dependent cardiac gene expression; (5) co-activates PNPLA1 for epidermal acylceramide biosynthesis essential for skin barrier; (6) interacts with PNPLA3(I148M) on lipid droplets, mediating its pro-steatotic effect; (7) inhibits nuclear translocation of DPY30/SET1A methyltransferase in the cytoplasm; and (8) protects BECN1 from caspase-3 cleavage to sustain autophagy—collectively establishing ABHD5 as a central regulator of lipid catabolism, signaling, and gene expression across multiple cell types."},"narrative":{"mechanistic_narrative":"ABHD5 (CGI-58) is an α/β-hydrolase-fold lipid droplet-associated protein that serves as the principal co-activator of adipose triglyceride lipase (ATGL), and more broadly as a hub coordinating lipid catabolism with signaling and gene expression [PMID:16679289, PMID:11590543]. Although it carries an esterase/lipase/thioesterase-type catalytic triad, the canonical catalytic serine is replaced by asparagine, and ABHD5 itself lacks intrinsic triacylglycerol lipase activity; instead it stimulates ATGL TG hydrolysis up to 20-fold through direct interaction [PMID:16679289, PMID:11590543, PMID:17308334]. ATGL activation depends on a defined functional surface (R299, G328) distinct from its other binding activities, and on N-terminal tryptophan-rich anchoring (Trp21/25 and Trp29) that tethers ABHD5 to the lipid droplet, since cytosolic mislocalization abolishes co-activation [PMID:20164531, PMID:26350461, PMID:28211464]. ABHD5 availability is controlled by reversible sequestration on perilipin-coated droplets (PLIN1/2/5): perilipins bind and stabilize ABHD5 while suppressing its access to ATGL, and PKA-mediated phosphorylation of both perilipin and ABHD5-Ser239 releases it for lipase activation [PMID:15292255, PMID:19850935, PMID:25421061, PMID:24927580]. Beyond ATGL, ABHD5 possesses acyl-CoA-dependent lysophosphatidic acid and lysophosphatidylglycerol acyltransferase activity [PMID:18606822, PMID:19801371, PMID:25315780], and acts as an ATGL-independent regulator of tissue lipid handling, with knockout mice showing systemic TG accumulation, hepatic steatosis, and a lethal skin barrier defect [PMID:20023287, PMID:27396333]. In the epidermis it recruits and co-activates PNPLA1 for acylceramide synthesis essential for barrier formation [PMID:30361410], and it mediates the pro-steatotic effect of PNPLA3(I148M) by directing its lipid droplet localization [PMID:30802989, PMID:39814233]. ABHD5 additionally functions as a serine protease cleaving HDAC4 to control MEF2-dependent cardiac gene expression [PMID:31742248], protects BECN1 from caspase-3 cleavage to sustain autophagy [PMID:27559856], and restrains tumor growth through metabolic and transcriptional pathways including AMPK/mTORC1 signaling and inhibition of DPY30/SET1A nuclear function [PMID:34795238, PMID:33219129]. Loss-of-function mutations in ABHD5 cause Chanarin-Dorfman syndrome, a neutral lipid storage disease with ichthyosis [PMID:11590543].","teleology":[{"year":2001,"claim":"Established the gene-disease link and structural identity, defining ABHD5 as an α/β-hydrolase-fold protein with an atypical catalytic triad lacking the canonical serine.","evidence":"Positional cloning and mutation screening in Chanarin-Dorfman syndrome patients with sequence/domain analysis","pmids":["11590543"],"confidence":"High","gaps":["Did not define the molecular function downstream of the mutations","Catalytic capacity of the atypical triad left unresolved"]},{"year":2004,"claim":"Showed that ABHD5 is recruited to lipid droplets through perilipin binding and is reversibly released to the cytoplasm upon PKA stimulation, placing it in lipolytic signaling.","evidence":"Proteomics, GFP imaging, perilipin deletion mutants, co-IP and isoproterenol/PKA stimulation in adipocytes; yeast two-hybrid with PLIN1/ADRP","pmids":["15292255","15136565"],"confidence":"High","gaps":["Functional consequence of recruitment for lipase activity not yet defined","Y2H/GFP interactions not all confirmed by reciprocal mammalian Co-IP"]},{"year":2006,"claim":"Identified the core molecular function: ABHD5 directly binds and activates ATGL to drive TG hydrolysis, with CDS mutants failing to activate, explaining the lipid storage phenotype.","evidence":"Co-expression, in vitro TG hydrolase assays, antisense knockdown, CDS fibroblast complementation, point mutagenesis across multiple cell systems","pmids":["16679289"],"confidence":"High","gaps":["ATGL-binding residues on ABHD5 not yet mapped","Did not address non-ATGL functions"]},{"year":2007,"claim":"Demonstrated ABHD5 itself lacks lipase/esterase activity and acts purely as a coactivator whose release from droplets depends on perilipin phosphorylation.","evidence":"siRNA knockdown, in vitro lipase assays, live-cell imaging of redistribution in preadipocytes and hepatoma cells","pmids":["17308334"],"confidence":"High","gaps":["Mechanism by which dispersion enables ATGL activation incomplete","ABHD5 phosphorylation not yet characterized"]},{"year":2008,"claim":"Revealed an intrinsic enzymatic activity distinct from ATGL coactivation: acyl-CoA-dependent LPA acyltransferase generating phosphatidic acid.","evidence":"Recombinant protein from E. coli, in vitro acyltransferase assays, yeast overexpression, adipose tissue MS","pmids":["18606822","19801371"],"confidence":"High","gaps":["Physiological significance of acyltransferase activity in vivo unresolved","Relationship between acyltransferase and coactivator roles unclear"]},{"year":2008,"claim":"Extended the perilipin-recruitment model to cardiac muscle and showed PLIN5/Mldp binding is required for ATGL activation at those droplets, generalizing the regulatory mechanism across tissues.","evidence":"In situ Co-IP, co-localization in cardiac fibers and fibroblasts, ABHD5 E262K loss-of-function mutant, lipid droplet assays; lamellar granule localization in keratinocytes","pmids":["19064991","18832586"],"confidence":"High","gaps":["Skin/keratinocyte function not yet mechanistically tied to a specific enzyme partner","Tissue-specific perilipin combinatorics incomplete"]},{"year":2009,"claim":"Defined perilipin as a sequestering reservoir whose PKA phosphorylation releases ABHD5 to engage ATGL, establishing the phosphorylation-gated lipolytic switch.","evidence":"FRET/BiFC live-cell imaging and phosphorylation-site mutagenesis in 3T3-L1 adipocytes; constitutive KO mouse showing systemic steatosis and lethal skin defect","pmids":["19850935","20023287"],"confidence":"High","gaps":["ABHD5 phosphorylation contribution not yet separated from perilipin phosphorylation","ATGL-independent skin function molecularly undefined"]},{"year":2010,"claim":"Mapped the lipid droplet anchor to an N-terminal tryptophan-rich region and showed correct localization is obligatory for ATGL activation, linking targeting to function.","evidence":"NMR with DPC micelles, GFP localization, deletion mutants, ATGL activation assays; characterization of a cytosolic splice isoform retaining only acyltransferase activity","pmids":["20164531","20083112"],"confidence":"High","gaps":["Precise anchor residues not yet resolved at structural level (addressed later)","Mechanistic basis for acyltransferase retention in cytosolic isoform unclear"]},{"year":2011,"claim":"Placed ABHD5 epistatically between PLIN1 and ATGL and localized the coactivation interface to ATGL's minimal patatin-domain fragment, with G0S2 acting as a CGI-58-independent inhibitor.","evidence":"BiFC, siRNA epistasis with human PLIN1 frameshift mutants, ATGL domain truncation, in vitro hydrolase assays and co-IP","pmids":["21757733","22039468"],"confidence":"High","gaps":["ABHD5 residues contacting ATGL not yet identified","Structural model of the ternary regulation absent"]},{"year":2013,"claim":"Demonstrated an ATGL-independent metabolic consequence: ABHD5 knockdown sequesters diacylglycerols away from the plasma membrane, preventing PKCε activation and dissociating hepatic DAG from insulin resistance.","evidence":"Antisense knockdown in mice, hyperinsulinemic-euglycemic clamp, subcellular DAG fractionation, PKCε translocation assay","pmids":["23302688"],"confidence":"High","gaps":["Direct molecular target mediating DAG compartmentalization not identified","Generalizability beyond liver untested"]},{"year":2014,"claim":"Refined the regulatory layer by identifying PKA phosphorylation of ABHD5-Ser239 as the determinant of its release, with perilipin C-terminus also stabilizing ABHD5 against proteasomal degradation.","evidence":"Phosphoamino acid analysis, MS, S239A mutagenesis, localization and in vitro coactivation assays; BiFC, chimeric perilipins and proteasome inhibition","pmids":["25421061","24927580"],"confidence":"High","gaps":["Whether phosphorylation alters intrinsic coactivation activity ruled out, but downstream conformational effects untested","Differential perilipin behavior in non-adipose tissue incompletely mapped"]},{"year":2014,"claim":"Broadened the enzymatic and signaling repertoire: ABHD5 reacylates lysophosphatidylglycerol to influence cardiolipin and mitophagy, and macrophage ABHD5 governs PPARγ/ROS/NLRP3 inflammatory signaling.","evidence":"Recombinant Sf9 protein with substrate panel and C2C12 manipulation; macrophage-specific KO mice with NLRP3 silencing and anti-ROS rescue","pmids":["25315780","24703845"],"confidence":"High","gaps":["Direct link between acyltransferase activity and mitophagy not fully reconstituted","Immune phenotype mechanism partly correlative"]},{"year":2015,"claim":"Established ABHD5 as a small-molecule and acyl-CoA-responsive switch and resolved the N-terminal anchor structure, showing two independent tryptophan arms are required for droplet binding and ATGL activation.","evidence":"Synthetic ligand screen with affinity probe labeling and FRET/BiFC lipolysis assays; NMR solution structure of the N-terminal peptide with Trp-to-Ala mutagenesis","pmids":["26411340","26350461"],"confidence":"High","gaps":["Endogenous ligand identity beyond acyl-CoA incomplete","Full-length ABHD5 structure still lacking"]},{"year":2016,"claim":"Defined a discrete ATGL-activating surface (R299, G328) separable from PLIN/ligand binding and droplet targeting, achieving precise functional dissection of the coactivator role; concurrently revealed ATGL-independent hepatic and autophagy/cancer functions.","evidence":"Gain-of-function transfer to ABHD4 and loss-of-function ABHD5 mutagenesis across cell systems; double-KO mouse hepatic comparison; BECN1/CASP3 competition and autophagy assays; macrophage SRM/spermidine CRC rescue","pmids":["28211464","27396333","27559856","27189574"],"confidence":"High","gaps":["Mechanism coupling lipid metabolism to autophagy and tumor suppression incompletely integrated","BECN1 protection shown by single-lab Co-IP/competition assay"]},{"year":2018,"claim":"Explained the skin barrier function by showing ABHD5 recruits and co-activates PNPLA1 for acylceramide synthesis, with CDS mutants defective in this activity.","evidence":"Co-expression acylceramide assays, immunofluorescence/immunoelectron microscopy, CDS mutant analysis in HeLa cells","pmids":["30361410","30527376"],"confidence":"High","gaps":["Whether ABHD5 enzymatic activity contributes to PNPLA1 stimulation unclear","Structural basis of ABHD5-PNPLA1 interaction unknown"]},{"year":2019,"claim":"Identified two non-lipolytic functions: ABHD5 acts as a serine protease cleaving HDAC4 to control MEF2-dependent cardiac gene expression, and is required for the pro-steatotic localization of PNPLA3(I148M).","evidence":"In vitro proteolysis, in vivo cardiac gene therapy and MEF2 reporter assays; reciprocal Co-IP, purified-protein pulldown and liver-specific Cgi-58 KO epistasis","pmids":["31742248","30802989"],"confidence":"High","gaps":["How an asparagine-substituted triad supports protease activity unresolved","PNPLA3 interaction surface on ABHD5 not mapped at the time"]},{"year":2020,"claim":"Extended ATGL coactivation to host-pathogen and growth control: ABHD5-ATGL lipolysis supports HCV particle production, and ABHD5-driven lipolysis activates AMPK/mTORC1 to suppress cancer cell growth.","evidence":"ABHD4/ABHD5 bidirectional mutagenesis with HCV production and lipolysis assays; AMP/ATP and AMPK/mTORC1 signaling with DGAT inhibition in prostate cancer cells","pmids":["32542055","33219129"],"confidence":"High","gaps":["Generalizability of the futile-cycle growth suppression beyond tested lines unclear","Link between viral assembly and specific lipid species incomplete"]},{"year":2021,"claim":"Revealed a cytoplasmic transcriptional brake: ABHD5 sequesters DPY30 to block SET1A nuclear function, restraining YAP methylation and c-Met-driven tumor stemness.","evidence":"Co-IP, nuclear fractionation, methyltransferase and YAP methylation assays in CRC cells and mouse models","pmids":["34795238"],"confidence":"High","gaps":["Structural basis of ABHD5-DPY30 interaction unknown","Integration with metabolic functions of ABHD5 unclear"]},{"year":2025,"claim":"Refined the PNPLA3(I148M) mechanism by showing lipid droplet targeting of ABHD5 is required for preferential interaction with the variant and for its steatotic effect.","evidence":"Fluorescence cross-correlation spectroscopy, molecular modeling, C-terminal truncation, in vitro and in vivo steatosis assays","pmids":["39814233"],"confidence":"Medium","gaps":["Single-lab biophysical study","Whether the interaction sequesters ABHD5 from ATGL not directly tested"]},{"year":null,"claim":"It remains unresolved how a single α/β-hydrolase scaffold with an atypical, serine-lacking triad mechanistically supports acyltransferase, HDAC4 protease, and lipase-coactivator activities, and how these are coordinated within and between cell types.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No full-length structure resolving the multiple functional surfaces","Catalytic mechanism of the reported protease and acyltransferase activities not reconciled with the atypical triad","Tissue-specific selection among competing functions undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,4,17]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[5,7,28]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[20]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[10,15]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[18,24,26]}],"localization":[{"term_id":"GO:0005811","term_label":"lipid droplet","supporting_discovery_ids":[2,3,9,10]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[2,4,26,33]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[31]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[0,5,8,22]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[24,28]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[20,26]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[23,27,30]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[1,21,32]}],"complexes":[],"partners":["PNPLA2","PLIN1","PLIN2","PLIN5","PNPLA1","PNPLA3","BECN1","DPY30"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8WTS1","full_name":"1-acylglycerol-3-phosphate O-acyltransferase ABHD5","aliases":["Abhydrolase domain-containing protein 5","Lipid droplet-binding protein CGI-58"],"length_aa":349,"mass_kda":39.1,"function":"Coenzyme A-dependent lysophosphatidic acid acyltransferase that catalyzes the transfer of an acyl group on a lysophosphatidic acid (PubMed:18606822). Functions preferentially with 1-oleoyl-lysophosphatidic acid followed by 1-palmitoyl-lysophosphatidic acid, 1-stearoyl-lysophosphatidic acid and 1-arachidonoyl-lysophosphatidic acid as lipid acceptor. Functions preferentially with arachidonoyl-CoA followed by oleoyl-CoA as acyl group donors (By similarity). Functions in phosphatidic acid biosynthesis (PubMed:18606822). May regulate the cellular storage of triacylglycerol through activation of the phospholipase PNPLA2 (PubMed:16679289). Involved in keratinocyte differentiation (PubMed:18832586). Regulates lipid droplet fusion (By similarity)","subcellular_location":"Cytoplasm; Lipid droplet; Cytoplasm, cytosol","url":"https://www.uniprot.org/uniprotkb/Q8WTS1/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ABHD5","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ABHD5","total_profiled":1310},"omim":[{"mim_id":"619728","title":"ABHYDROLASE DOMAIN-CONTAINING PROTEIN 4, N-ACYL PHOSPHOLIPASE B; ABHD4","url":"https://www.omim.org/entry/619728"},{"mim_id":"616966","title":"ABHYDROLASE DOMAIN-CONTAINING PROTEIN 6, ACYLGLYCEROL LIPASE; ABHD6","url":"https://www.omim.org/entry/616966"},{"mim_id":"613877","title":"LIPODYSTROPHY, FAMILIAL PARTIAL, TYPE 4; FPLD4","url":"https://www.omim.org/entry/613877"},{"mim_id":"613248","title":"PERILIPIN 5; PLIN5","url":"https://www.omim.org/entry/613248"},{"mim_id":"610717","title":"NEUTRAL LIPID STORAGE DISEASE WITH MYOPATHY; NLSDM","url":"https://www.omim.org/entry/610717"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Vesicles","reliability":"Supported"},{"location":"Cytosol","reliability":"Supported"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/ABHD5"},"hgnc":{"alias_symbol":["CGI-58","NCIE2"],"prev_symbol":[]},"alphafold":{"accession":"Q8WTS1","domains":[{"cath_id":"3.40.50.1820","chopping":"29-183_192-346","consensus_level":"high","plddt":92.3148,"start":29,"end":346}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8WTS1","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8WTS1-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8WTS1-F1-predicted_aligned_error_v6.png","plddt_mean":87.38},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ABHD5","jax_strain_url":"https://www.jax.org/strain/search?query=ABHD5"},"sequence":{"accession":"Q8WTS1","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8WTS1.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8WTS1/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8WTS1"}},"corpus_meta":[{"pmid":"16679289","id":"PMC_16679289","title":"Adipose triglyceride lipase-mediated lipolysis of cellular fat stores is activated by CGI-58 and defective in Chanarin-Dorfman Syndrome.","date":"2006","source":"Cell metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/16679289","citation_count":743,"is_preprint":false},{"pmid":"11590543","id":"PMC_11590543","title":"Mutations in CGI-58, the gene encoding a new protein of the esterase/lipase/thioesterase subfamily, in Chanarin-Dorfman syndrome.","date":"2001","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/11590543","citation_count":380,"is_preprint":false},{"pmid":"19850935","id":"PMC_19850935","title":"Perilipin controls lipolysis by regulating the interactions of AB-hydrolase containing 5 (Abhd5) and adipose triglyceride lipase (Atgl).","date":"2009","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/19850935","citation_count":314,"is_preprint":false},{"pmid":"15292255","id":"PMC_15292255","title":"Perilipin A mediates the reversible binding of CGI-58 to lipid droplets in 3T3-L1 adipocytes.","date":"2004","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/15292255","citation_count":256,"is_preprint":false},{"pmid":"19401457","id":"PMC_19401457","title":"Neutral lipid storage disease: genetic disorders caused by mutations in adipose triglyceride lipase/PNPLA2 or CGI-58/ABHD5.","date":"2009","source":"American journal of physiology. 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CDS-associated CGI-58 point mutations fail to activate ATGL. CGI-58/ATGL co-expression attenuates lipid accumulation in COS-7 cells, and antisense-mediated CGI-58 knockdown in 3T3-L1 adipocytes inhibits TG mobilization. Expression of functional CGI-58 in CDS fibroblasts restores lipolysis.\",\n      \"method\": \"Co-expression in COS-7 cells, in vitro TG hydrolase activity assays, antisense RNA knockdown in 3T3-L1 adipocytes, complementation in CDS patient fibroblasts, point-mutation analysis\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal methods (in vitro assay, mutagenesis, cell-based complementation, KD with defined phenotype), replicated across several cell systems in one rigorous study\",\n      \"pmids\": [\"16679289\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Mutations in CGI-58 (ABHD5) cause Chanarin-Dorfman syndrome; the CGI-58 protein belongs to the alpha/beta-hydrolase fold family and contains a catalytic triad of the esterase/lipase/thioesterase subfamily, but with asparagine replacing the usual catalytic serine, indicating an atypical or absent classical hydrolase activity.\",\n      \"method\": \"Positional cloning, mutation screening in CDS patients, sequence analysis of protein domain structure\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic linkage, mutation identification in multiple families, bioinformatic domain analysis; foundational gene-disease link with structural annotation\",\n      \"pmids\": [\"11590543\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"CGI-58 localizes to lipid droplet surfaces in differentiated 3T3-L1 adipocytes via interaction with perilipin A. The C-terminal sequence (aa 382-429) of perilipin A is required for CGI-58 binding. PKA activation by isoproterenol disperses CGI-58 from lipid droplets to the cytoplasm in a reversible manner. CDS-associated CGI-58 mutants fail to localize to lipid droplets.\",\n      \"method\": \"Proteomics identification, CGI-58-GFP localization in adipocytes, perilipin deletion mutants, immunoprecipitation, isoproterenol/PKA stimulation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, GFP live imaging, deletion mutagenesis, pharmacological manipulation, replicated with both endogenous and ectopic protein\",\n      \"pmids\": [\"15292255\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"CGI-58 directly interacts with perilipin in a yeast two-hybrid assay and co-localizes to lipid droplet surfaces. CDS-associated CGI-58 mutations (amino acid substitutions) abolish perilipin binding and lipid droplet recruitment. CGI-58 also interacts with ADRP (perilipin-2) and co-localizes with ADRP-coated lipid droplets in non-differentiated cells.\",\n      \"method\": \"Yeast two-hybrid, GFP fusion co-localization, loss-of-function CDS mutants\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — yeast two-hybrid and GFP co-localization (not reciprocal Co-IP in mammalian cells), but multiple interacting partners tested and CDS mutants validate functional relevance\",\n      \"pmids\": [\"15136565\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CGI-58 knockdown in 3T3-L1 preadipocytes and Hepa1 hepatoma cells causes abnormal LD accumulation and reduces basal and PKA-stimulated lipolysis. In vitro, CGI-58 itself lacks lipase/esterase activity but enhances ATGL activity. Upon lipolytic stimulation, CGI-58 disperses from LDs to the cytosol, dependent on perilipin phosphorylation (phosphorylated perilipin loses CGI-58 binding).\",\n      \"method\": \"siRNA knockdown, in vitro lipase assay, lipolysis assays, live-cell imaging of CGI-58 redistribution\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro activity assay (no lipase activity), knockdown with defined phenotype, mechanistic live-cell imaging, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"17308334\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Recombinant human CGI-58, purified from E. coli, catalyzes acyl-CoA-dependent acylation of lysophosphatidic acid (LPA) to phosphatidic acid (PA). The enzyme does not acylate other lysophospholipids or neutral glycerolipid acceptors. Overexpression of CGI-58 in yeast increases PA and total phospholipids while reducing TG levels. Endogenous CGI-58 is the LPA acyltransferase in mouse white adipose tissue lipid droplets.\",\n      \"method\": \"Recombinant protein purification from E. coli, in vitro acyltransferase assay, overexpression in S. cerevisiae, immunoblot and mass spectrometry in mouse adipose tissue\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with purified recombinant protein, multiple substrate specificity assays, in vivo yeast validation, single lab\",\n      \"pmids\": [\"18606822\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Perilipin (Plin) binds ABHD5 with high affinity and sequesters it, thereby suppressing ABHD5 interaction with ATGL and reducing basal lipolysis. PKA-mediated phosphorylation of Plin on Ser492 or Ser517 rapidly releases ABHD5 from Plin, allowing ABHD5 to directly interact with ATGL predominantly on lipid droplets containing Plin.\",\n      \"method\": \"FRET/protein trafficking in live cells (3T3-L1 adipocytes), bimolecular fluorescence complementation, phosphorylation site mutagenesis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — live-cell fluorescence imaging with multiple mutants, phosphorylation site mapping, defined functional consequence (lipolysis control), single lab with multiple orthogonal approaches\",\n      \"pmids\": [\"19850935\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Recombinant mouse CGI-58 expressed in E. coli displays acyl-CoA-dependent lysophosphatidic acid acyltransferase (LPAAT) activity, with preference for arachidonoyl-CoA and oleoyl-CoA as acyl donors and 1-oleoyl-LPA as acceptor. CGI-58 contains a conserved HXXXXD motif consistent with acyltransferase function. Expression of CGI-58 in CDS fibroblasts increases incorporation of fatty acids released from stored TG into phospholipids.\",\n      \"method\": \"Recombinant protein expression in E. coli, in vitro LPAAT assay with substrate specificity, fluorescence quenching, radiotracer lipid incorporation in fibroblasts\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with purified protein, substrate specificity panel, disease fibroblast complementation, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"19801371\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"CGI-58-deficient (Cgi-58−/−) mice display systemic TG accumulation, severe hepatic steatosis, and a lethal neonatal skin permeability barrier defect. The skin barrier defect is linked to impaired epidermal TG hydrolysis and consequent failure to synthesize acylceramides, revealing an ATGL-independent function of CGI-58 in skin lipid metabolism.\",\n      \"method\": \"Constitutive mouse knockout, lipid analysis, histology, metabolic measurements\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO mouse with multiple defined cellular and biochemical phenotypes, biochemically distinguishes ATGL-dependent and ATGL-independent CGI-58 functions\",\n      \"pmids\": [\"20023287\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"ABHD5 interacts with Mldp (LSDP5/PLIN5) on the surface of lipid droplets in cardiac muscle, directing ABHD5 to those droplets in proportion to Mldp concentration. An ABHD5 E262K mutant with reduced Mldp binding fails to support Atgl activity at Mldp-containing lipid droplets, despite Atgl being present, demonstrating that the ABHD5-Mldp interaction is required for Atgl activation in this context.\",\n      \"method\": \"Co-IP in situ, fluorescence co-localization in cardiac muscle fibers and transfected fibroblasts, point-mutant ABHD5 E262K functional analysis, oleic acid loading, lipid droplet assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — protein-protein interaction validated in situ and in cells with loss-of-function mutant, functional lipid droplet assay, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"19064991\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The N-terminal tryptophan-rich region (aa 1-30) of CGI-58 is required for lipid droplet binding and for ATGL activation. NMR experiments demonstrate strong interaction between the N-terminal peptide and dodecylphosphocholine micelles (lipid droplet mimic). N-terminally truncated CGI-58 localizes to the cytoplasm and loses ability to stimulate ATGL, linking correct localization to activating function.\",\n      \"method\": \"1H NMR with lipid-droplet-mimicking micelles, GFP-fusion localization, deletion mutants in cell culture, ATGL activation assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR structural data combined with cell-based localization and functional activity assay, mutagenesis, single lab\",\n      \"pmids\": [\"20164531\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Human PLIN1 C-terminal frameshift mutations (Leu-404fs, Val-398fs) fail to bind ABHD5, causing constitutive ABHD5-mediated coactivation of ATGL and elevated basal lipolysis. siRNA knockdown of either ABHD5 or ATGL in cells expressing mutant PLIN1 reduces basal lipolysis, placing ABHD5 between PLIN1 and ATGL in the lipolytic signaling hierarchy.\",\n      \"method\": \"Bimolecular fluorescence complementation (BiFC), siRNA knockdown, basal lipolysis assay in preadipocytes\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — BiFC assay demonstrates direct protein interaction failure, epistasis via siRNA rescue confirms pathway order, validated with naturally occurring human mutations\",\n      \"pmids\": [\"21757733\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The minimal active domain of ATGL (aa 1-254) retains both TG hydrolase activity and the capacity to be coactivated by CGI-58 and inhibited by G0S2, establishing that the CGI-58 interaction interface is within this minimal patatin-domain fragment. G0S2 inhibits ATGL independently of CGI-58 and regardless of ATGL activity state.\",\n      \"method\": \"Domain truncation, in vitro TG hydrolase assay, co-IP with CGI-58 and G0S2, 3D homology modeling\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro assay with deletion series and co-IP, single lab, defines interaction domain but no mutagenesis of binding residues\",\n      \"pmids\": [\"22039468\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CGI-58 is phosphorylated by PKA on Ser239 in mouse (Ser237 in human). Phosphorylation of Ser239 is required for dispersion of CGI-58 from PLIN1-coated lipid droplets upon PKA activation, thereby increasing CGI-58 availability for ATGL coactivation. Phosphorylation of CGI-58 itself neither increases nor impairs in vitro ATGL coactivation; perilipin phosphorylation also contributes to CGI-58 dispersion.\",\n      \"method\": \"Phosphoamino acid analysis, mass spectrometry, immunoblotting of recombinant and endogenous CGI-58, S239A/S240A mutagenesis, subcellular localization in adipocytes, in vitro ATGL coactivation assay\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — three orthogonal methods to identify phosphorylation site, mutagenesis defines functional consequence on localization, in vitro assay tests activity, single rigorous study\",\n      \"pmids\": [\"25421061\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Synthetic ligands directly bind ABHD5 (confirmed by affinity probe labeling and molecular imaging), releasing ABHD5 from PLIN1 or PLIN5 without PKA activation, thereby rapidly activating adipocyte and muscle lipolysis. Endogenous ligands including long-chain acyl-CoA also regulate ABHD5-PLIN interactions.\",\n      \"method\": \"Synthetic ligand screen, affinity probe labeling, molecular imaging (FRET/BiFC), lipolysis assays in 3T3-L1 adipocytes and muscle cells\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct target engagement (affinity probe), functional lipolysis readout, mechanistic dissection of PLIN-ABHD5 interaction, multiple cell types, multiple orthogonal methods\",\n      \"pmids\": [\"26411340\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The NMR solution structure of the CGI-58 N-terminal lipid-droplet anchor peptide (residues 10-31) bound to DPC micelles reveals that Trp21/Trp25 form one anchor arm and Trp29 forms an independent second arm. Simultaneous Trp-to-Ala substitutions in both arms abolish CGI-58 lipid droplet localization and ATGL-activating function, while single-arm substitutions do not.\",\n      \"method\": \"Solution NMR structure of N-terminal peptide with DPC micelles, Trp-to-Ala mutagenesis, cell-based localization and ATGL activation assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR structure with functional validation by mutagenesis and cell-based assays, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"26350461\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Perilipin 1 C-terminus binds ABHD5 and stabilizes it by retarding its proteasomal degradation; perilipins 2 and 3 lack this C-terminal domain and thus sequester ABHD5 less effectively, resulting in higher rates of basal lipolysis in non-adipose tissues. Chimeric proteins with PLIN1 C-terminus fused to PLIN2/3 N-terminus stabilize ABHD5 and suppress basal lipolysis.\",\n      \"method\": \"BiFC assays, chimeric perilipin constructs, perilipin knockdown in adipocytes, proteasome inhibition experiments, basal lipolysis measurement\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — BiFC interaction assays, chimeric protein rescue, proteasome inhibition, KD with defined phenotype, multiple orthogonal approaches in one study\",\n      \"pmids\": [\"24927580\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Two conserved ABHD5 residues (R299 and G328) are required for ATGL activation. Introducing equivalent residues into the paralog ABHD4 (N303R/S332G) confers ATGL-activating ability. Corresponding mutations in ABHD5 (R299N, G328S) selectively disrupt lipolysis without affecting ATGL lipid droplet translocation, PLIN binding, or ligand interactions, defining a novel functional surface on ABHD5 for lipase activation.\",\n      \"method\": \"Comparative evolutionary analysis, gain-of-function mutagenesis of ABHD4, loss-of-function mutagenesis of ABHD5, ATGL activation assays in Cos7 cells/brown adipocytes/artificial lipid droplets, structural modeling\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — gain-of-function and loss-of-function mutagenesis across multiple assay systems, functional dissociation of ATGL activation from other ABHD5 activities\",\n      \"pmids\": [\"28211464\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ABHD5 directly interacts with PNPLA1 and recruits it to lipid droplets, stimulating PNPLA1-catalyzed ω-O-acylceramide (AcylCer) biosynthesis essential for skin barrier formation. ABHD5 mutations associated with ichthyosis in Chanarin-Dorfman syndrome fail to accelerate PNPLA1-mediated AcylCer production.\",\n      \"method\": \"Co-expression in AcylCer-producing cell system, immunofluorescence and immunoelectron microscopy, loss-of-function CDS mutants, lipid analysis\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — protein interaction, functional lipid synthesis assay, CDS mutant validation, multiple imaging modalities, single lab\",\n      \"pmids\": [\"30361410\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ABHD5 stimulates PNPLA1-catalyzed acylceramide synthesis; co-expression causes PNPLA1 to relocalize from dispersed to lipid-droplet membranes, and at high expression levels leads to lipid droplet morphological transformation into vesicles or ER incorporation. CDS-associated ABHD5 mutations reduce this ability.\",\n      \"method\": \"Indirect immunofluorescence microscopy, immunoelectron microscopy, acylceramide production assay in HeLa cells, CDS mutant analysis\",\n      \"journal\": \"Journal of dermatological science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — imaging and functional assay in one lab, consistent with companion paper (PMID 30361410), single lab\",\n      \"pmids\": [\"30527376\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ABHD5 functions as a serine protease that cleaves HDAC4 in vitro and in vivo, generating an N-terminal HDAC4 polypeptide (HDAC4-NT) that inhibits MEF2-dependent gene expression and controls glucose handling. ABHD5 deficiency leads to cardiac lipid accumulation; cardiac gene therapy with HDAC4-NT prevents heart failure without preventing lipid accumulation, separating lipotoxicity from functional cardiac protection.\",\n      \"method\": \"In vitro proteolysis assay, in vivo mouse cardiac gene therapy, MEF2 reporter assay, pressure-overload heart failure model, ABHD5 overexpression in transgenic mice\",\n      \"journal\": \"Nature metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro and in vivo protease activity, genetic rescue with defined substrate cleavage product, multiple mouse models, direct mechanistic dissection of lipid versus signaling functions\",\n      \"pmids\": [\"31742248\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PNPLA3 (WT and I148M) interacts directly with CGI-58; co-immunoprecipitation and pulldown with purified proteins from mouse livers confirm this interaction. PNPLA3 requires CGI-58 for its localization to hepatic lipid droplets, and overexpression of PNPLA3(148M) increases hepatic TG in WT but not in liver-specific Cgi-58 KO mice, establishing that the pro-steatotic effect of PNPLA3(148M) requires CGI-58.\",\n      \"method\": \"Co-immunoprecipitation in mouse livers, in vitro pulldown with purified proteins, liver-specific CGI-58 KO mice, CGI-58 dependent PNPLA3 localization\",\n      \"journal\": \"Hepatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — reciprocal Co-IP, in vitro pulldown with purified proteins, and genetic epistasis (KO mouse), multiple orthogonal methods in one study\",\n      \"pmids\": [\"30802989\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CGI-58 knockdown causes hepatic steatosis in mice both with and without ATGL, demonstrating that CGI-58 regulates hepatic TG and diacylglycerol accumulation, and hepatic inflammation, via ATGL-independent mechanisms. ATGL deficiency (but not CGI-58 deficiency) suppresses the hepatic de novo lipogenic program.\",\n      \"method\": \"Mice with single and double deficiency of CGI-58 and ATGL (direct genetic comparison), lipid analysis, gene expression profiling\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct epistasis via double-KO mouse comparison, defined biochemical and transcriptional phenotypes, mechanistically distinguishes CGI-58 and ATGL functions\",\n      \"pmids\": [\"27396333\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CGI-58 knockdown in mice sequesters diacylglycerols (DAG) in lipid droplets/ER rather than the plasma membrane, preventing PKCε translocation to the plasma membrane and thereby dissociating DAG accumulation from hepatic insulin resistance.\",\n      \"method\": \"Antisense oligonucleotide knockdown in mice, hyperinsulinemic-euglycemic clamp, subcellular DAG fractionation, PKCε membrane translocation assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo KD with clamp studies, subcellular fractionation, kinase translocation assay, multiple orthogonal methods defining mechanism\",\n      \"pmids\": [\"23302688\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"ABHD5 directly interacts with BECN1 (Beclin 1) and competes with caspase-3 (CASP3) for binding at BECN1 cleavage sites, preventing CASP3-mediated BECN1 cleavage and inactivation, thereby sustaining autophagic flux. ABHD5 deficiency permits CASP3 to cleave BECN1, impairing autophagy independent of PNPLA2/ATGL.\",\n      \"method\": \"Co-IP, competitive binding assay, autophagic flux measurement, CASP3 cleavage assay, colorectal cancer cell lines and intestine-specific KO mouse model\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and competitive binding assay mechanistically defined, functional autophagy readout, single lab, moderate replication\",\n      \"pmids\": [\"27559856\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Macrophage ABHD5 suppresses spermidine synthase (SRM)-dependent spermidine production by inhibiting ROS-dependent expression of C/EBPε, which activates SRM transcription. ABHD5 expression in macrophages thereby reduces spermidine availability and potentiates CRC growth; additional SRM transgene in macrophages prevents ABHD5 transgene-induced CRC growth.\",\n      \"method\": \"In vitro macrophage-CRC co-culture, mouse xenograft and genetic cancer models, SRM transgene rescue experiment, ROS measurement, C/EBPε expression analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic rescue with SRM transgene demonstrates epistasis, in vitro mechanism (ROS-C/EBPε-SRM) validated by multiple models\",\n      \"pmids\": [\"27189574\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ABHD5 interacts in the cytoplasm with DPY30 (core subunit of SET1A methyltransferase complex), inhibiting DPY30 nuclear translocation and SET1A activity. ABHD5 loss allows DPY30 nuclear entry, enabling SET1A-mediated methylation of YAP and histone H3, sequestering YAP in the nucleus and promoting c-Met transcription to sustain CRC stemness.\",\n      \"method\": \"Co-IP for ABHD5-DPY30 interaction, nuclear fractionation, SET1A methyltransferase assay, YAP methylation assay, gene expression analysis, CRC cell and mouse models\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — protein interaction (Co-IP), subcellular fractionation, enzyme activity assay (methyltransferase), downstream YAP/c-Met phenotype, multiple orthogonal methods\",\n      \"pmids\": [\"34795238\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ABHD5-mediated lipolysis activates the AMPK/mTORC1 pathway by elevating intracellular AMP, leading to AMPK activation and mTORC1 inhibition, suppressing protein synthesis and cancer cell growth. This suppression requires fatty acid re-esterification (by DGAT1/DGAT2), which consumes ATP, creating a futile cycle between TG hydrolysis and resynthesis.\",\n      \"method\": \"ABHD5 overexpression and pharmacological lipolysis activation, AMP/ATP measurement, AMPK/mTORC1 signaling assays, DGAT1/2 inhibition, cell cycle analysis in prostate cancer cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — defined biochemical pathway with pharmacological and genetic interventions, single lab, multiple assays\",\n      \"pmids\": [\"33219129\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Recombinant CGI-58 catalyzes reacylation of lysophosphatidylglycerol to phosphatidylglycerol (PG) in an acyl-CoA-dependent manner, but lacks acyltransferase activity toward other lysophospholipids. Overexpression and knockdown of CGI-58 in C2C12 cells reciprocally affect endogenous PG levels, thereby altering cardiolipin availability and mitochondrial autophagy (mitophagy) through PINK1/AMPK/mTORC1 signaling.\",\n      \"method\": \"Recombinant protein from Sf9 cells, in vitro acyltransferase assay with substrate panel, overexpression/knockdown in C2C12 cells, lipid analysis, mitophagy and autophagy assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro reconstitution identifies novel substrate (LPG), cell-based validation, single lab\",\n      \"pmids\": [\"25315780\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ABHD5 cooperates with ATGL to mobilize lipid droplet-stored triglycerides required for HCV infectious particle production in hepatocytes. Specific ABHD5 residues critical for ATGL activation are required for both lipolytic and pro-viral functions; grafting these ABHD5 residues onto the paralog ABHD4 confers pro-viral and lipolytic activity. ABHD5 residues at the predicted ATGL interface are necessary for both functions.\",\n      \"method\": \"ATGL modulation (protein expression and lipase inhibitor), ABHD4 gain-of-function mutagenesis, ABHD5 loss-of-function mutagenesis, HCV production assay, lipid droplet lipolysis measurement\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — bidirectional mutagenesis (gain- and loss-of-function), functional lipolysis and viral production assays, mechanistically defines ABHD5-ATGL interface\",\n      \"pmids\": [\"32542055\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Macrophage-specific CGI-58 knockout causes mitochondrial dysfunction via defective PPARγ signaling, leading to ROS overproduction that activates NLRP3 inflammasome, potentiating proinflammatory cytokine secretion and aggravating HFD-induced insulin resistance. Anti-ROS treatment or NLRP3 silencing prevents cytokine oversecretion and insulin resistance in CGI-58-deficient macrophages.\",\n      \"method\": \"Macrophage-specific CGI-58 KO mice, mitochondrial function assays, ROS measurement, NLRP3 inflammasome activation, anti-ROS treatment, cytokine assays, co-culture with fat slices\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — tissue-specific KO with multiple mechanism-testing interventions (NLRP3 KD, anti-ROS), defined pathway, in vivo and in vitro validation\",\n      \"pmids\": [\"24703845\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"CGI-58 is localized to lamellar granules in differentiated keratinocytes of the granular layer. CGI-58 knockdown reduces expression of keratinocyte differentiation/keratinization markers, indicating a role in keratinocyte differentiation and lamellar granule lipid metabolism for skin barrier formation.\",\n      \"method\": \"Immunoelectron microscopy of lamellar granules, immunohistochemistry of human epidermis, siRNA knockdown in cultured keratinocytes, organotypic 3D cultures\",\n      \"journal\": \"The American journal of pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ultrastructural localization by immunoelectron microscopy, functional knockdown with defined phenotype, single lab\",\n      \"pmids\": [\"18832586\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Lipid droplet targeting of ABHD5 is required for its interaction with PNPLA3 I148M. Fluorescence cross-correlation spectroscopy demonstrates that PNPLA3 I148M has greater association with ABHD5 on LDs than WT PNPLA3. PNPLA3 C-terminus is sufficient for LD targeting and ABHD5 interaction. LD targeting of PNPLA3 I148M is required to promote steatosis in vitro and in vivo.\",\n      \"method\": \"Fluorescence cross-correlation spectroscopy, molecular modeling, C-terminal domain truncation, in vitro steatosis assay, in vivo liver steatosis model\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biophysical interaction assay plus functional steatosis readout, single lab, extends prior findings (PMID 30802989)\",\n      \"pmids\": [\"39814233\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"A short CGI-58 splice isoform (mCGI-58S), lacking exons 2 and 3, localizes predominantly to the cytoplasm (not lipid droplets), cannot activate ATGL, cannot promote lipid droplet turnover, but retains LPA acyltransferase activity, functionally dissociating ATGL activation from acyltransferase function.\",\n      \"method\": \"Cloning of alternative splice variant, GFP-fusion localization, ATGL activation assay, lipid droplet accumulation assay, LPA acyltransferase assay\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional dissection with naturally occurring isoform, multiple assays, single lab\",\n      \"pmids\": [\"20083112\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ABHD5/CGI-58 is a multifunctional lipid droplet-associated protein that: (1) potently co-activates ATGL-mediated triacylglycerol hydrolysis via direct protein-protein interaction requiring specific surface residues (R299, G328) and N-terminal tryptophan-rich LD anchoring; (2) is regulated by reversible sequestration on lipid droplets through perilipin proteins (PLIN1/2/5), released upon PKA-mediated phosphorylation of both perilipin and ABHD5-Ser239; (3) possesses acyl-CoA-dependent lysophosphatidic acid (and lysophosphatidylglycerol) acyltransferase activity; (4) acts as a serine protease cleaving HDAC4 to regulate MEF2-dependent cardiac gene expression; (5) co-activates PNPLA1 for epidermal acylceramide biosynthesis essential for skin barrier; (6) interacts with PNPLA3(I148M) on lipid droplets, mediating its pro-steatotic effect; (7) inhibits nuclear translocation of DPY30/SET1A methyltransferase in the cytoplasm; and (8) protects BECN1 from caspase-3 cleavage to sustain autophagy—collectively establishing ABHD5 as a central regulator of lipid catabolism, signaling, and gene expression across multiple cell types.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ABHD5 (CGI-58) is an α/β-hydrolase-fold lipid droplet-associated protein that serves as the principal co-activator of adipose triglyceride lipase (ATGL), and more broadly as a hub coordinating lipid catabolism with signaling and gene expression [#0, #1]. Although it carries an esterase/lipase/thioesterase-type catalytic triad, the canonical catalytic serine is replaced by asparagine, and ABHD5 itself lacks intrinsic triacylglycerol lipase activity; instead it stimulates ATGL TG hydrolysis up to 20-fold through direct interaction [#0, #1, #4]. ATGL activation depends on a defined functional surface (R299, G328) distinct from its other binding activities, and on N-terminal tryptophan-rich anchoring (Trp21/25 and Trp29) that tethers ABHD5 to the lipid droplet, since cytosolic mislocalization abolishes co-activation [#10, #15, #17]. ABHD5 availability is controlled by reversible sequestration on perilipin-coated droplets (PLIN1/2/5): perilipins bind and stabilize ABHD5 while suppressing its access to ATGL, and PKA-mediated phosphorylation of both perilipin and ABHD5-Ser239 releases it for lipase activation [#2, #6, #13, #16]. Beyond ATGL, ABHD5 possesses acyl-CoA-dependent lysophosphatidic acid and lysophosphatidylglycerol acyltransferase activity [#5, #7, #28], and acts as an ATGL-independent regulator of tissue lipid handling, with knockout mice showing systemic TG accumulation, hepatic steatosis, and a lethal skin barrier defect [#8, #22]. In the epidermis it recruits and co-activates PNPLA1 for acylceramide synthesis essential for barrier formation [#18], and it mediates the pro-steatotic effect of PNPLA3(I148M) by directing its lipid droplet localization [#21, #32]. ABHD5 additionally functions as a serine protease cleaving HDAC4 to control MEF2-dependent cardiac gene expression [#20], protects BECN1 from caspase-3 cleavage to sustain autophagy [#24], and restrains tumor growth through metabolic and transcriptional pathways including AMPK/mTORC1 signaling and inhibition of DPY30/SET1A nuclear function [#26, #27]. Loss-of-function mutations in ABHD5 cause Chanarin-Dorfman syndrome, a neutral lipid storage disease with ichthyosis [#1].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Established the gene-disease link and structural identity, defining ABHD5 as an α/β-hydrolase-fold protein with an atypical catalytic triad lacking the canonical serine.\",\n      \"evidence\": \"Positional cloning and mutation screening in Chanarin-Dorfman syndrome patients with sequence/domain analysis\",\n      \"pmids\": [\"11590543\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the molecular function downstream of the mutations\", \"Catalytic capacity of the atypical triad left unresolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Showed that ABHD5 is recruited to lipid droplets through perilipin binding and is reversibly released to the cytoplasm upon PKA stimulation, placing it in lipolytic signaling.\",\n      \"evidence\": \"Proteomics, GFP imaging, perilipin deletion mutants, co-IP and isoproterenol/PKA stimulation in adipocytes; yeast two-hybrid with PLIN1/ADRP\",\n      \"pmids\": [\"15292255\", \"15136565\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of recruitment for lipase activity not yet defined\", \"Y2H/GFP interactions not all confirmed by reciprocal mammalian Co-IP\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identified the core molecular function: ABHD5 directly binds and activates ATGL to drive TG hydrolysis, with CDS mutants failing to activate, explaining the lipid storage phenotype.\",\n      \"evidence\": \"Co-expression, in vitro TG hydrolase assays, antisense knockdown, CDS fibroblast complementation, point mutagenesis across multiple cell systems\",\n      \"pmids\": [\"16679289\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"ATGL-binding residues on ABHD5 not yet mapped\", \"Did not address non-ATGL functions\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Demonstrated ABHD5 itself lacks lipase/esterase activity and acts purely as a coactivator whose release from droplets depends on perilipin phosphorylation.\",\n      \"evidence\": \"siRNA knockdown, in vitro lipase assays, live-cell imaging of redistribution in preadipocytes and hepatoma cells\",\n      \"pmids\": [\"17308334\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which dispersion enables ATGL activation incomplete\", \"ABHD5 phosphorylation not yet characterized\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Revealed an intrinsic enzymatic activity distinct from ATGL coactivation: acyl-CoA-dependent LPA acyltransferase generating phosphatidic acid.\",\n      \"evidence\": \"Recombinant protein from E. coli, in vitro acyltransferase assays, yeast overexpression, adipose tissue MS\",\n      \"pmids\": [\"18606822\", \"19801371\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological significance of acyltransferase activity in vivo unresolved\", \"Relationship between acyltransferase and coactivator roles unclear\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Extended the perilipin-recruitment model to cardiac muscle and showed PLIN5/Mldp binding is required for ATGL activation at those droplets, generalizing the regulatory mechanism across tissues.\",\n      \"evidence\": \"In situ Co-IP, co-localization in cardiac fibers and fibroblasts, ABHD5 E262K loss-of-function mutant, lipid droplet assays; lamellar granule localization in keratinocytes\",\n      \"pmids\": [\"19064991\", \"18832586\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Skin/keratinocyte function not yet mechanistically tied to a specific enzyme partner\", \"Tissue-specific perilipin combinatorics incomplete\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Defined perilipin as a sequestering reservoir whose PKA phosphorylation releases ABHD5 to engage ATGL, establishing the phosphorylation-gated lipolytic switch.\",\n      \"evidence\": \"FRET/BiFC live-cell imaging and phosphorylation-site mutagenesis in 3T3-L1 adipocytes; constitutive KO mouse showing systemic steatosis and lethal skin defect\",\n      \"pmids\": [\"19850935\", \"20023287\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"ABHD5 phosphorylation contribution not yet separated from perilipin phosphorylation\", \"ATGL-independent skin function molecularly undefined\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Mapped the lipid droplet anchor to an N-terminal tryptophan-rich region and showed correct localization is obligatory for ATGL activation, linking targeting to function.\",\n      \"evidence\": \"NMR with DPC micelles, GFP localization, deletion mutants, ATGL activation assays; characterization of a cytosolic splice isoform retaining only acyltransferase activity\",\n      \"pmids\": [\"20164531\", \"20083112\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise anchor residues not yet resolved at structural level (addressed later)\", \"Mechanistic basis for acyltransferase retention in cytosolic isoform unclear\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Placed ABHD5 epistatically between PLIN1 and ATGL and localized the coactivation interface to ATGL's minimal patatin-domain fragment, with G0S2 acting as a CGI-58-independent inhibitor.\",\n      \"evidence\": \"BiFC, siRNA epistasis with human PLIN1 frameshift mutants, ATGL domain truncation, in vitro hydrolase assays and co-IP\",\n      \"pmids\": [\"21757733\", \"22039468\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"ABHD5 residues contacting ATGL not yet identified\", \"Structural model of the ternary regulation absent\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Demonstrated an ATGL-independent metabolic consequence: ABHD5 knockdown sequesters diacylglycerols away from the plasma membrane, preventing PKCε activation and dissociating hepatic DAG from insulin resistance.\",\n      \"evidence\": \"Antisense knockdown in mice, hyperinsulinemic-euglycemic clamp, subcellular DAG fractionation, PKCε translocation assay\",\n      \"pmids\": [\"23302688\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct molecular target mediating DAG compartmentalization not identified\", \"Generalizability beyond liver untested\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Refined the regulatory layer by identifying PKA phosphorylation of ABHD5-Ser239 as the determinant of its release, with perilipin C-terminus also stabilizing ABHD5 against proteasomal degradation.\",\n      \"evidence\": \"Phosphoamino acid analysis, MS, S239A mutagenesis, localization and in vitro coactivation assays; BiFC, chimeric perilipins and proteasome inhibition\",\n      \"pmids\": [\"25421061\", \"24927580\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether phosphorylation alters intrinsic coactivation activity ruled out, but downstream conformational effects untested\", \"Differential perilipin behavior in non-adipose tissue incompletely mapped\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Broadened the enzymatic and signaling repertoire: ABHD5 reacylates lysophosphatidylglycerol to influence cardiolipin and mitophagy, and macrophage ABHD5 governs PPARγ/ROS/NLRP3 inflammatory signaling.\",\n      \"evidence\": \"Recombinant Sf9 protein with substrate panel and C2C12 manipulation; macrophage-specific KO mice with NLRP3 silencing and anti-ROS rescue\",\n      \"pmids\": [\"25315780\", \"24703845\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct link between acyltransferase activity and mitophagy not fully reconstituted\", \"Immune phenotype mechanism partly correlative\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Established ABHD5 as a small-molecule and acyl-CoA-responsive switch and resolved the N-terminal anchor structure, showing two independent tryptophan arms are required for droplet binding and ATGL activation.\",\n      \"evidence\": \"Synthetic ligand screen with affinity probe labeling and FRET/BiFC lipolysis assays; NMR solution structure of the N-terminal peptide with Trp-to-Ala mutagenesis\",\n      \"pmids\": [\"26411340\", \"26350461\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous ligand identity beyond acyl-CoA incomplete\", \"Full-length ABHD5 structure still lacking\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined a discrete ATGL-activating surface (R299, G328) separable from PLIN/ligand binding and droplet targeting, achieving precise functional dissection of the coactivator role; concurrently revealed ATGL-independent hepatic and autophagy/cancer functions.\",\n      \"evidence\": \"Gain-of-function transfer to ABHD4 and loss-of-function ABHD5 mutagenesis across cell systems; double-KO mouse hepatic comparison; BECN1/CASP3 competition and autophagy assays; macrophage SRM/spermidine CRC rescue\",\n      \"pmids\": [\"28211464\", \"27396333\", \"27559856\", \"27189574\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism coupling lipid metabolism to autophagy and tumor suppression incompletely integrated\", \"BECN1 protection shown by single-lab Co-IP/competition assay\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Explained the skin barrier function by showing ABHD5 recruits and co-activates PNPLA1 for acylceramide synthesis, with CDS mutants defective in this activity.\",\n      \"evidence\": \"Co-expression acylceramide assays, immunofluorescence/immunoelectron microscopy, CDS mutant analysis in HeLa cells\",\n      \"pmids\": [\"30361410\", \"30527376\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ABHD5 enzymatic activity contributes to PNPLA1 stimulation unclear\", \"Structural basis of ABHD5-PNPLA1 interaction unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified two non-lipolytic functions: ABHD5 acts as a serine protease cleaving HDAC4 to control MEF2-dependent cardiac gene expression, and is required for the pro-steatotic localization of PNPLA3(I148M).\",\n      \"evidence\": \"In vitro proteolysis, in vivo cardiac gene therapy and MEF2 reporter assays; reciprocal Co-IP, purified-protein pulldown and liver-specific Cgi-58 KO epistasis\",\n      \"pmids\": [\"31742248\", \"30802989\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How an asparagine-substituted triad supports protease activity unresolved\", \"PNPLA3 interaction surface on ABHD5 not mapped at the time\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Extended ATGL coactivation to host-pathogen and growth control: ABHD5-ATGL lipolysis supports HCV particle production, and ABHD5-driven lipolysis activates AMPK/mTORC1 to suppress cancer cell growth.\",\n      \"evidence\": \"ABHD4/ABHD5 bidirectional mutagenesis with HCV production and lipolysis assays; AMP/ATP and AMPK/mTORC1 signaling with DGAT inhibition in prostate cancer cells\",\n      \"pmids\": [\"32542055\", \"33219129\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Generalizability of the futile-cycle growth suppression beyond tested lines unclear\", \"Link between viral assembly and specific lipid species incomplete\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Revealed a cytoplasmic transcriptional brake: ABHD5 sequesters DPY30 to block SET1A nuclear function, restraining YAP methylation and c-Met-driven tumor stemness.\",\n      \"evidence\": \"Co-IP, nuclear fractionation, methyltransferase and YAP methylation assays in CRC cells and mouse models\",\n      \"pmids\": [\"34795238\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of ABHD5-DPY30 interaction unknown\", \"Integration with metabolic functions of ABHD5 unclear\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Refined the PNPLA3(I148M) mechanism by showing lipid droplet targeting of ABHD5 is required for preferential interaction with the variant and for its steatotic effect.\",\n      \"evidence\": \"Fluorescence cross-correlation spectroscopy, molecular modeling, C-terminal truncation, in vitro and in vivo steatosis assays\",\n      \"pmids\": [\"39814233\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab biophysical study\", \"Whether the interaction sequesters ABHD5 from ATGL not directly tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how a single α/β-hydrolase scaffold with an atypical, serine-lacking triad mechanistically supports acyltransferase, HDAC4 protease, and lipase-coactivator activities, and how these are coordinated within and between cell types.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No full-length structure resolving the multiple functional surfaces\", \"Catalytic mechanism of the reported protease and acyltransferase activities not reconciled with the atypical triad\", \"Tissue-specific selection among competing functions undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 4, 17]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [5, 7, 28]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [20]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [10, 15]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [18, 24, 26]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005811\", \"supporting_discovery_ids\": [2, 3, 9, 10]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [2, 4, 26, 33]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [31]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 5, 8, 22]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [24, 28]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [20, 26]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [23, 27, 30]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [1, 21, 32]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"PNPLA2\", \"PLIN1\", \"PLIN2\", \"PLIN5\", \"PNPLA1\", \"PNPLA3\", \"BECN1\", \"DPY30\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}