GO:0002178 palmitoyltransferase complex: Components, Assembly and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0002178 (palmitoyltransferase complex) is a cellular component defined as a protein complex with palmitoyltransferase activity.
• The complex typically contains a zDHHC-family enzyme (e.g., ZDHHC3, ZDHHC5, ZDHHC7, ZDHHC20) and accessory or substrate proteins such as GOLGA7.
• Palmitoyltransferase complexes catalyze S-palmitoylation, a reversible lipid modification that regulates protein trafficking, stability, and signaling [1,2,4].
• Dysregulation of these complexes is linked to liver cancer, nonalcoholic steatohepatitis, autophagy defects, and cardiomyopathy [1,2,4,7].
• Key experimental approaches include CRISPR knockout, point-mutation knock-in, and overexpression of zDHHC genes, combined with palmitoylation assays and proteomics [1,2,4,6].
• Understanding the composition and regulation of palmitoyltransferase complexes offers therapeutic targets for metabolic and oncogenic diseases [1,4,5].
Description
The palmitoyltransferase complex (GO:0002178) is a cellular component defined by its possession of palmitoyltransferase activity, the enzymatic addition of palmitate to cysteine residues of target proteins. This post-translational modification, known as S-palmitoylation, is catalyzed by a family of enzymes called zDHHC proteins, which often function within multi-protein complexes that include accessory factors and substrate adaptors. The complex is essential for dynamic regulation of protein localization and function in processes ranging from autophagy to lipid metabolism [1,2,4]. Researchers study GO:0002178 to understand how lipid modification controls signaling networks and contributes to diseases such as cancer and metabolic disorders [1,4,5].
palmitoyltransferase complex At A Glance
| GO ID | GO:0002178 |
|---|---|
| GO term | palmitoyltransferase complex |
| Ontology | cellular_component |
| Synonym | none |
| Major function | Catalyzes S-palmitoylation of target proteins |
| Major components | zDHHC enzymes (e.g., ZDHHC3, ZDHHC5, ZDHHC7, ZDHHC20) and accessory proteins like GOLGA7 |
| Associated processes | Protein trafficking, autophagy, lipid metabolism, signal transduction |
| Disease relevance | Cancer, nonalcoholic steatohepatitis, cardiomyopathy, autophagy-related disorders |
What Is GO:0002178?
According to the Gene Ontology, GO:0002178 (palmitoyltransferase complex) is a protein complex that exhibits palmitoyltransferase activity. This means the complex as a whole is capable of transferring a palmitoyl group to a substrate protein, typically on cysteine residues, forming a thioester linkage. The complex may consist of a catalytic zDHHC enzyme and auxiliary subunits that regulate its activity, substrate specificity, or localization.
Why Is palmitoyltransferase complex Important in Cell Biology?
Palmitoyltransferase complexes are central to the dynamic regulation of protein function through reversible lipidation. By adding palmitate to proteins, these complexes control membrane association, protein-protein interactions, and subcellular trafficking, impacting nearly every cellular pathway [1,2,4]. Their dysfunction is increasingly implicated in human diseases, including hepatocellular carcinoma, fatty liver disease, and heart failure, making them attractive targets for therapeutic intervention [1,4,7].
• Regulates protein localization and stability via S-palmitoylation [1,2].
• Controls key signaling pathways in cancer and metabolism [1,4].
• Essential for autophagy through ATG16L1 modification.
• Modulates lipid metabolism and mitochondrial function [3,8].
• Involved in nonalcoholic steatohepatitis pathogenesis.
• Linked to ischemic cardiomyopathy via SPTLC3 and complex I activity.
• Provides potential biomarkers and drug targets [1,5].
• Enables CRISPR-based functional studies of zDHHC genes [1,2,4,6].
What Happens During palmitoyltransferase complex?
Substrate recognition and binding
In simple terms: The complex first grabs onto the protein it will modify.
The palmitoyltransferase complex recognizes specific substrate proteins through interactions mediated by the zDHHC enzyme and accessory proteins. For example, ZDHHC20 binds fatty acid synthase (FASN) to promote its palmitoylation. Similarly, ZDHHC7 interacts with ATG16L1 to facilitate its modification.
Catalytic transfer of palmitate
In simple terms: The complex attaches a fatty acid (palmitate) to the target protein.
The catalytic zDHHC enzyme transfers a palmitoyl group from palmitoyl-CoA to a cysteine residue on the substrate, forming a thioester bond. This reaction is exemplified by ZDHHC3-mediated palmitoylation of IRHOM2 and ZDHHC20-mediated palmitoylation of FASN.
Regulation of complex assembly
In simple terms: Helper proteins help the complex form and work correctly.
Accessory proteins such as GOLGA7 are critical for the stability and function of the palmitoyltransferase complex. The ZDHHC5-GOLGA7 complex is a well-characterized example where GOLGA7 is required for palmitoyltransferase activity.
Downstream effects on substrate function
In simple terms: After modification, the target protein changes its behavior.
Palmitoylation alters substrate localization, stability, or interactions. For instance, S-palmitoylation of ATG16L1 by ZDHHC7 promotes LC3 lipidation and autophagosome formation, while palmitoylation of FASN by ZDHHC20 enhances its oncogenic function in hepatocarcinogenesis.
Key Genes Involved in GO:0002178 palmitoyltransferase complex
The following genes encode components or regulators of the palmitoyltransferase complex (GO:0002178) and are frequently studied in disease and cell biology research.
| Gene | Major Role | Research Relevance |
|---|---|---|
| ZDHHC20 | Palmitoylates FASN | Promotes hepatocarcinogenesis |
| ZDHHC7 | Palmitoylates ATG16L1 | Facilitates autophagy |
| ZDHHC3 | Palmitoylates IRHOM2 | Aggravates nonalcoholic steatohepatitis |
| ZDHHC5 | Forms complex with GOLGA7 | Model for complex assembly |
| GOLGA7 | Accessory protein for ZDHHC5 | Required for palmitoyltransferase activity |
| FASN | Substrate of ZDHHC20 | Lipid synthesis, cancer |
| ATG16L1 | Substrate of ZDHHC7 | Autophagy regulation |
| IRHOM2 | Substrate of ZDHHC3 | Inflammation, NASH |
| CPT1A | Fatty acid oxidation | Metabolic regulation |
| SPTLC3 | Sphingolipid synthesis | Cardiomyopathy, complex I activity |
| ACACA | Acetyl-CoA carboxylase | Lipid metabolism |
| ZDHHC family | Palmitoyltransferases | Broad substrate range |
| GOLGA7 family | Accessory proteins | Complex stability |
| LC3 | Autophagosome marker | Autophagy flux |
| IRHOM2 | Pseudoprotease | NASH pathogenesis |
| FASN | Fatty acid synthase | Hepatocarcinogenesis |
| ATG16L1 | Autophagy protein | LC3 lipidation |
How Is palmitoyltransferase complex Regulated?
The activity and assembly of palmitoyltransferase complexes are regulated at multiple levels. Accessory proteins such as GOLGA7 are essential for the stability and function of the ZDHHC5 complex. Substrate availability and post-translational modifications of zDHHC enzymes also modulate activity. For example, ZDHHC20-mediated palmitoylation of FASN is linked to hepatocarcinogenesis, suggesting that oncogenic signaling may influence complex activity. Additionally, lipid metabolic pathways involving CPT1A and ACACA can impact the availability of palmitoyl-CoA, the substrate for palmitoylation [3,8].
palmitoyltransferase complex and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| ZDHHC20 | Hepatocellular carcinoma | KO or overexpression in liver cancer cell lines |
| ZDHHC3 | Nonalcoholic steatohepatitis | KO or point-mutation in hepatocytes |
| ZDHHC7 | Autophagy defects | KO or knock-in in autophagy reporter cells |
| SPTLC3 | Ischemic cardiomyopathy | KO or overexpression in cardiomyocytes |
| FASN | Lipid metabolism, cancer | Point mutation of palmitoylation site |
Hepatocellular carcinoma
ZDHHC20-mediated S-palmitoylation of FASN promotes hepatocarcinogenesis, highlighting the palmitoyltransferase complex as a driver of liver cancer. Lipid alterations in chronic liver disease further support the role of palmitoylation in cancer progression.
Nonalcoholic steatohepatitis (NASH)
ZDHHC3 aggravates NASH by targeting S-palmitoylated IRHOM2, linking the palmitoyltransferase complex to fatty liver inflammation.
Autophagy-related disorders
ZDHHC7-mediated S-palmitoylation of ATG16L1 facilitates LC3 lipidation and autophagosome formation, implicating the complex in autophagy regulation and related diseases.
Cardiomyopathy
SPTLC3, a component of sphingolipid metabolism, is essential for complex I activity and contributes to ischemic cardiomyopathy, suggesting a broader role for lipid modification complexes in heart disease.
From palmitoyltransferase complex-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does ZDHHC20 palmitoylate FASN? | KO of ZDHHC20 in liver cancer cells |
| Is ZDHHC7 required for autophagy? | KO of ZDHHC7 in autophagy reporter cells |
| Does ZDHHC3 palmitoylate IRHOM2? | Point mutation of IRHOM2 cysteine |
| How does GOLGA7 regulate ZDHHC5? | Knock-in of tagged GOLGA7 |
| What is the role of SPTLC3 in cardiomyopathy? | Overexpression in cardiomyocytes |
| Can ACACA modulate lipid metabolism? | KO or overexpression in hepatocytes |
How to Study the palmitoyltransferase complex Process
| Method | What It Measures | Typical Application |
|---|---|---|
| ABE assay | S-palmitoylation levels | Confirm substrate modification [1,2] |
| Co-IP/MS | Protein-protein interactions | Identify complex components |
| CRISPR KO screen | Gene essentiality | Discover regulators of palmitoylation [1,4] |
| Fluorescence microscopy | Subcellular localization | Track complex and substrate trafficking |
| Western blot | Protein expression/stability | Assess knockout efficiency [1,4] |
| RNA-seq | Transcriptional changes | Global effects of complex disruption |
| Lipidomics | Lipid species profiling | Metabolic impact of palmitoylation [3,8] |
| Autophagy flux assay | LC3 lipidation | Measure autophagy activity |
Palmitoylation assays
Acyl-biotin exchange (ABE) or click chemistry-based assays measure S-palmitoylation levels of specific proteins. These methods are used to confirm that zDHHC enzymes within the complex modify substrates such as FASN or ATG16L1 [1,2].
Proteomics and interactomics
Mass spectrometry-based proteomics can identify components of the palmitoyltransferase complex and their substrates. Co-immunoprecipitation followed by mass spectrometry reveals interactions between zDHHC enzymes and accessory proteins like GOLGA7.
CRISPR screening
Genome-wide CRISPR knockout screens can identify genes required for palmitoyltransferase complex function or substrate modification. This approach is valuable for discovering novel regulators of S-palmitoylation [1,4].
Imaging and subcellular localization
Fluorescence microscopy of tagged zDHHC proteins and substrates reveals the subcellular localization of the complex and its effects on protein trafficking. For example, ATG16L1 palmitoylation affects autophagosome formation.
How CRISPR Can Be Used to Study GO:0002178 palmitoyltransferase complex
Knockout
CRISPR knockout of zDHHC genes (e.g., ZDHHC20, ZDHHC7, ZDHHC3) is used to abolish palmitoyltransferase complex activity and study loss-of-function phenotypes in cancer, autophagy, and metabolism [1,2,4].
Point Mutation
Point mutations of the catalytic cysteine in zDHHC enzymes or the acceptor cysteine in substrates (e.g., FASN, ATG16L1) can prevent palmitoylation and dissect specific modification sites [1,2].
Knock-in
Knock-in of tagged zDHHC proteins or accessory factors like GOLGA7 allows for affinity purification and live-cell imaging of the palmitoyltransferase complex.
Overexpression
Overexpression of zDHHC enzymes or substrates (e.g., ZDHHC3, IRHOM2) can enhance palmitoylation and model disease states such as NASH or cancer.
How EDITGENE Supports palmitoyltransferase complex Research
Researchers studying palmitoyltransferase complex-related genes often need to determine whether a candidate gene is causally involved in complex assembly, substrate modification, or disease phenotypes. EDITGENE provides comprehensive CRISPR services to enable such functional studies.
Contact EDITGENE today to design your custom CRISPR model for palmitoyltransferase complex research.
Frequently Asked Questions About palmitoyltransferase complex
What is GO:0002178?
GO:0002178 is the Gene Ontology term for palmitoyltransferase complex, a protein complex with palmitoyltransferase activity.
What genes are involved in palmitoyltransferase complex?
Key genes include ZDHHC20, ZDHHC7, ZDHHC3, ZDHHC5, and accessory proteins like GOLGA7 [1,2,4,6].
What does palmitoyltransferase complex do?
It catalyzes S-palmitoylation, adding palmitate to proteins to regulate their localization and function [1,2].
How is palmitoyltransferase complex regulated?
Regulation involves accessory proteins like GOLGA7 and substrate availability.
What diseases are linked to palmitoyltransferase complex?
It is linked to hepatocellular carcinoma, NASH, autophagy defects, and cardiomyopathy [1,2,4,7].
How can I study palmitoyltransferase complex using CRISPR?
CRISPR knockout, point mutation, knock-in, and overexpression of zDHHC genes are common approaches [1,2,4,6].
What methods measure palmitoylation?
Acyl-biotin exchange (ABE) and click chemistry assays are standard [1,2].
What is the role of ZDHHC20 in cancer?
ZDHHC20 palmitoylates FASN to promote hepatocarcinogenesis.
How does ZDHHC7 affect autophagy?
ZDHHC7 palmitoylates ATG16L1 to facilitate LC3 lipidation and autophagosome formation.
What is the ZDHHC5-GOLGA7 complex?
It is a well-characterized palmitoyltransferase complex where GOLGA7 is essential for activity.
Conclusion
The palmitoyltransferase complex (GO:0002178) is a critical cellular machinery for S-palmitoylation, influencing protein function, trafficking, and signaling. Its components, particularly zDHHC enzymes and accessory proteins, are implicated in major diseases such as cancer, NASH, and cardiomyopathy. Continued research using CRISPR models and advanced proteomics will uncover new therapeutic opportunities.
References
- 1. Mo Y et al.. 2024. ZDHHC20 mediated S-palmitoylation of fatty acid synthase (FASN) promotes hepatocarcinogenesis.. Mol Cancer 23(1):274 PMID: 39696259
- 2. Wei F et al.. 2024. ZDHHC7-mediated S-palmitoylation of ATG16L1 facilitates LC3 lipidation and autophagosome formation.. Autophagy 20(12):2719-2737 PMID: 39087410
- 3. Schlaepfer IR et al.. 2020. CPT1A-mediated Fat Oxidation, Mechanisms, and Therapeutic Potential.. Endocrinology 161(2) PMID: 31900483
- 4. Xu M et al.. 2023. Palmitoyltransferase ZDHHC3 Aggravates Nonalcoholic Steatohepatitis by Targeting S-Palmitoylated IRHOM2.. Adv Sci (Weinh) 10(28):e2302130 PMID: 37544908
- 5. Paul B et al.. 2022. Lipid alterations in chronic liver disease and liver cancer.. JHEP Rep 4(6):100479 PMID: 35469167
- 6. Kahlson MA et al.. 2025. Functional dissection of the zDHHC palmitoyltransferase 5-golgin A7 palmitoylation complex.. J Biol Chem 301(10):110694 PMID: 40930250
- 7. Kovilakath A et al.. 2024. SPTLC3 Is Essential for Complex I Activity and Contributes to Ischemic Cardiomyopathy.. Circulation 150(8):622-641 PMID: 38660786
- 8. Dong J et al.. 2024. ACACA reduces lipid accumulation through dual regulation of lipid metabolism and mitochondrial function via AMPK- PPARα- CPT1A axis.. J Transl Med 22(1):196 PMID: 38395901
