| 2006 |
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. |
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 |
Cell metabolism |
High |
16679289
|
| 2001 |
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. |
Positional cloning, mutation screening in CDS patients, sequence analysis of protein domain structure |
American journal of human genetics |
High |
11590543
|
| 2004 |
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. |
Proteomics identification, CGI-58-GFP localization in adipocytes, perilipin deletion mutants, immunoprecipitation, isoproterenol/PKA stimulation |
The Journal of biological chemistry |
High |
15292255
|
| 2004 |
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. |
Yeast two-hybrid, GFP fusion co-localization, loss-of-function CDS mutants |
The Journal of biological chemistry |
Medium |
15136565
|
| 2007 |
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). |
siRNA knockdown, in vitro lipase assay, lipolysis assays, live-cell imaging of CGI-58 redistribution |
Journal of lipid research |
High |
17308334
|
| 2008 |
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. |
Recombinant protein purification from E. coli, in vitro acyltransferase assay, overexpression in S. cerevisiae, immunoblot and mass spectrometry in mouse adipose tissue |
The Journal of biological chemistry |
High |
18606822
|
| 2009 |
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. |
FRET/protein trafficking in live cells (3T3-L1 adipocytes), bimolecular fluorescence complementation, phosphorylation site mutagenesis |
The Journal of biological chemistry |
High |
19850935
|
| 2009 |
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. |
Recombinant protein expression in E. coli, in vitro LPAAT assay with substrate specificity, fluorescence quenching, radiotracer lipid incorporation in fibroblasts |
Journal of lipid research |
High |
19801371
|
| 2009 |
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. |
Constitutive mouse knockout, lipid analysis, histology, metabolic measurements |
The Journal of biological chemistry |
High |
20023287
|
| 2008 |
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. |
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 |
The Journal of biological chemistry |
High |
19064991
|
| 2010 |
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. |
1H NMR with lipid-droplet-mimicking micelles, GFP-fusion localization, deletion mutants in cell culture, ATGL activation assays |
The Journal of biological chemistry |
High |
20164531
|
| 2011 |
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. |
Bimolecular fluorescence complementation (BiFC), siRNA knockdown, basal lipolysis assay in preadipocytes |
The Journal of biological chemistry |
High |
21757733
|
| 2011 |
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. |
Domain truncation, in vitro TG hydrolase assay, co-IP with CGI-58 and G0S2, 3D homology modeling |
PloS one |
Medium |
22039468
|
| 2014 |
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. |
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 of lipid research |
High |
25421061
|
| 2015 |
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. |
Synthetic ligand screen, affinity probe labeling, molecular imaging (FRET/BiFC), lipolysis assays in 3T3-L1 adipocytes and muscle cells |
Cell metabolism |
High |
26411340
|
| 2015 |
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. |
Solution NMR structure of N-terminal peptide with DPC micelles, Trp-to-Ala mutagenesis, cell-based localization and ATGL activation assays |
The Journal of biological chemistry |
High |
26350461
|
| 2014 |
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. |
BiFC assays, chimeric perilipin constructs, perilipin knockdown in adipocytes, proteasome inhibition experiments, basal lipolysis measurement |
Proceedings of the National Academy of Sciences of the United States of America |
High |
24927580
|
| 2016 |
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. |
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 |
Scientific reports |
High |
28211464
|
| 2018 |
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. |
Co-expression in AcylCer-producing cell system, immunofluorescence and immunoelectron microscopy, loss-of-function CDS mutants, lipid analysis |
Journal of lipid research |
High |
30361410
|
| 2018 |
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. |
Indirect immunofluorescence microscopy, immunoelectron microscopy, acylceramide production assay in HeLa cells, CDS mutant analysis |
Journal of dermatological science |
Medium |
30527376
|
| 2019 |
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. |
In vitro proteolysis assay, in vivo mouse cardiac gene therapy, MEF2 reporter assay, pressure-overload heart failure model, ABHD5 overexpression in transgenic mice |
Nature metabolism |
High |
31742248
|
| 2019 |
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. |
Co-immunoprecipitation in mouse livers, in vitro pulldown with purified proteins, liver-specific CGI-58 KO mice, CGI-58 dependent PNPLA3 localization |
Hepatology |
High |
30802989
|
| 2016 |
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. |
Mice with single and double deficiency of CGI-58 and ATGL (direct genetic comparison), lipid analysis, gene expression profiling |
Cell reports |
High |
27396333
|
| 2013 |
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. |
Antisense oligonucleotide knockdown in mice, hyperinsulinemic-euglycemic clamp, subcellular DAG fractionation, PKCε membrane translocation assay |
Proceedings of the National Academy of Sciences of the United States of America |
High |
23302688
|
| 2016 |
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. |
Co-IP, competitive binding assay, autophagic flux measurement, CASP3 cleavage assay, colorectal cancer cell lines and intestine-specific KO mouse model |
Autophagy |
Medium |
27559856
|
| 2016 |
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. |
In vitro macrophage-CRC co-culture, mouse xenograft and genetic cancer models, SRM transgene rescue experiment, ROS measurement, C/EBPε expression analysis |
Nature communications |
High |
27189574
|
| 2021 |
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. |
Co-IP for ABHD5-DPY30 interaction, nuclear fractionation, SET1A methyltransferase assay, YAP methylation assay, gene expression analysis, CRC cell and mouse models |
Nature communications |
High |
34795238
|
| 2020 |
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. |
ABHD5 overexpression and pharmacological lipolysis activation, AMP/ATP measurement, AMPK/mTORC1 signaling assays, DGAT1/2 inhibition, cell cycle analysis in prostate cancer cells |
The Journal of biological chemistry |
Medium |
33219129
|
| 2014 |
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. |
Recombinant protein from Sf9 cells, in vitro acyltransferase assay with substrate panel, overexpression/knockdown in C2C12 cells, lipid analysis, mitophagy and autophagy assays |
The Journal of biological chemistry |
Medium |
25315780
|
| 2020 |
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. |
ATGL modulation (protein expression and lipase inhibitor), ABHD4 gain-of-function mutagenesis, ABHD5 loss-of-function mutagenesis, HCV production assay, lipid droplet lipolysis measurement |
PLoS pathogens |
High |
32542055
|
| 2014 |
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. |
Macrophage-specific CGI-58 KO mice, mitochondrial function assays, ROS measurement, NLRP3 inflammasome activation, anti-ROS treatment, cytokine assays, co-culture with fat slices |
Cell reports |
High |
24703845
|
| 2008 |
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. |
Immunoelectron microscopy of lamellar granules, immunohistochemistry of human epidermis, siRNA knockdown in cultured keratinocytes, organotypic 3D cultures |
The American journal of pathology |
Medium |
18832586
|
| 2025 |
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. |
Fluorescence cross-correlation spectroscopy, molecular modeling, C-terminal domain truncation, in vitro steatosis assay, in vivo liver steatosis model |
The Journal of biological chemistry |
Medium |
39814233
|
| 2010 |
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. |
Cloning of alternative splice variant, GFP-fusion localization, ATGL activation assay, lipid droplet accumulation assay, LPA acyltransferase assay |
FEBS letters |
Medium |
20083112
|