GO:0019706 protein-cysteine S-palmitoyltransferase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0019706 describes the enzymatic transfer of a palmitoyl group from palmitoyl-CoA to a cysteine residue on a protein, forming a thioester linkage.
• This activity is carried out by a family of DHHC (Asp-His-His-Cys) motif-containing enzymes, including ZDHHC4, ZDHHC12, ZDHHC18, and ZDHHC24.
• Protein S-palmitoylation is reversible and regulates protein membrane association, trafficking, and signaling.
• Dysregulation of palmitoyltransferases such as ZDHHC4/12/18/24 and the depalmitoylase APT2 has been linked to cancer, including lung adenocarcinoma.
• Studying GO:0019706 requires tools such as CRISPR knockout, point mutation, and overexpression models to dissect gene function.
• Comparative transcriptomics in non-model organisms like Octopus sinensis reveals conserved and divergent expression of palmitoyltransferase genes.
Description
Protein-cysteine S-palmitoyltransferase activity (GO:0019706) is a molecular function that catalyzes the covalent attachment of a 16-carbon saturated fatty acid, palmitate, to cysteine residues of target proteins. This post-translational modification, known as S-palmitoylation, is essential for regulating protein localization, stability, and interactions within cellular membranes. The enzymes responsible for this activity are characterized by a conserved DHHC (Asp-His-His-Cys) zinc finger domain and are encoded by ZDHHC genes in humans. Understanding GO:0019706 is critical because it controls key signaling pathways and has been implicated in diseases ranging from cancer to neurological disorders. Recent studies have identified specific ZDHHC family members, such as ZDHHC4, ZDHHC12, ZDHHC18, and ZDHHC24, as prognostic biomarkers in lung adenocarcinoma, underscoring the clinical relevance of this enzymatic activity. Moreover, comparative transcriptomic analyses in organisms like Octopus sinensis have begun to explore the evolutionary conservation of palmitoyltransferase expression, highlighting its broad biological importance.
protein-cysteine S-palmitoyltransferase activity At A Glance
| GO ID | GO:0019706 |
|---|---|
| GO term | protein-cysteine S-palmitoyltransferase activity |
| Ontology | molecular_function |
| Synonym | protein-cysteine S-palmitoleyltransferase activity |
| Major function | Transfer of palmitoyl group to cysteine residues on proteins |
| Reaction | hexadecanoyl-CoA + L-cysteinyl-[protein] = CoA + S-hexadecanoyl-L-cysteinyl-[protein] |
| Enzyme family | DHHC (Asp-His-His-Cys) domain-containing proteins |
| Subcellular location | Endoplasmic reticulum and Golgi apparatus (typical for DHHC enzymes) |
What Is GO:0019706?
GO:0019706, protein-cysteine S-palmitoyltransferase activity, is defined as the catalysis of the transfer of a palmitoyl (hexadecanoyl) group from hexadecanoyl-CoA to a sulfur atom on the cysteine of a protein molecule, yielding CoA and S-hexadecanoyl-L-cysteinyl-[protein]. This activity is synonymous with protein-cysteine S-palmitoleyltransferase activity and is a type of acyltransferase.
Why Is protein-cysteine S-palmitoyltransferase activity Important in Cell Biology?
GO:0019706 is fundamental to cellular signaling and membrane dynamics because S-palmitoylation acts as a reversible lipid modification that dictates protein partitioning between soluble and membrane compartments. This activity regulates the function of numerous oncoproteins and tumor suppressors, and its dysregulation is increasingly recognized in cancer biology, including lung adenocarcinoma where ZDHHC4/12/18/24 and APT2 expression correlates with patient prognosis. Beyond cancer, palmitoyltransferases influence synaptic transmission, immune responses, and development, making them attractive targets for therapeutic intervention. The evolutionary conservation of these enzymes, as suggested by transcriptomic studies in Octopus sinensis, further emphasizes their fundamental roles in eukaryotic biology.
• Regulates membrane association and trafficking of signaling proteins such as RAS and G-proteins.
• Modulates protein stability and interaction networks in cancer cells.
• Serves as a potential prognostic biomarker in lung adenocarcinoma (ZDHHC4/12/18/24, APT2).
• Influences synaptic plasticity and neuronal function through palmitoylation of synaptic proteins.
• Plays a role in immune signaling by palmitoylating immune receptors and adaptors.
• Is essential for development and tissue homeostasis in model organisms.
• Exhibits evolutionary conservation, as indicated by expression in non-model species like Octopus sinensis.
• Provides a druggable target for small-molecule inhibitors of DHHC enzymes.
• Crosstalks with other post-translational modifications like phosphorylation and ubiquitination.
• Enables dynamic regulation of protein localization through reversible palmitoylation cycles.
What Happens During protein-cysteine S-palmitoyltransferase activity?
Substrate Recognition and Binding
In simple terms: The enzyme first grabs the protein that needs to be modified and the lipid donor molecule.
The DHHC enzyme recognizes target proteins through specific sequences or structural features, often near cysteine residues that will accept the palmitate. It also binds palmitoyl-CoA, the donor of the palmitoyl group, positioning it for transfer.
Catalytic Transfer of Palmitate
In simple terms: The enzyme snips the palmitate off the donor and attaches it to the target protein.
The conserved DHHC cysteine residue undergoes auto-palmitoylation as an intermediate, then transfers the palmitoyl group to the substrate cysteine, forming a thioester bond. This two-step mechanism ensures specificity and efficiency.
Membrane Association and Localization
In simple terms: The modified protein now sticks to cell membranes, changing where it works.
S-palmitoylation increases hydrophobicity, allowing the modified protein to associate with lipid bilayers such as the plasma membrane or Golgi. This reversible modification enables dynamic shuttling between compartments.
Reversibility and Depalmitoylation
In simple terms: Another enzyme can remove the palmitate, making the process reversible.
Depalmitoylases such as APT2 (acyl-protein thioesterase 2) hydrolyze the thioester bond, releasing the protein from membranes and terminating the signal. The balance between palmitoylation and depalmitoylation is crucial for normal physiology.
Key Genes Involved in GO:0019706 protein-cysteine S-palmitoyltransferase activity
The following genes encode proteins with demonstrated or inferred protein-cysteine S-palmitoyltransferase activity (GO:0019706) or are directly involved in its regulation, based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| ZDHHC4 | Palmitoyltransferase; prognostic biomarker in lung adenocarcinoma | Cancer progression and lipid metabolism |
| ZDHHC12 | Palmitoyltransferase; associated with lung adenocarcinoma prognosis | Tumor suppressor or oncogene depending on context |
| ZDHHC18 | Palmitoyltransferase; biomarker in lung adenocarcinoma | Cell signaling and membrane trafficking |
| ZDHHC24 | Palmitoyltransferase; prognostic marker in lung adenocarcinoma | Cancer cell proliferation and survival |
| APT2 | Depalmitoylase; removes palmitate from proteins | Reverses palmitoylation; cancer biomarker |
| ZDHHC2 | Palmitoyltransferase; known to modify synaptic proteins | Neuronal signaling and cancer |
| ZDHHC3 | Palmitoyltransferase; modifies GABAA receptors | Synaptic inhibition and epilepsy |
| ZDHHC5 | Palmitoyltransferase; regulates cell adhesion | Cancer metastasis and synaptic plasticity |
| ZDHHC7 | Palmitoyltransferase; modifies sex steroid receptors | Breast cancer and development |
| ZDHHC8 | Palmitoyltransferase; associated with schizophrenia risk | Neuropsychiatric disorders |
| ZDHHC9 | Palmitoyltransferase; mutates in X-linked intellectual disability | Cognitive function and cancer |
| ZDHHC11 | Palmitoyltransferase; regulates immune signaling | Inflammation and cancer |
| ZDHHC13 | Palmitoyltransferase; involved in skin and bone homeostasis | Developmental disorders |
| ZDHHC15 | Palmitoyltransferase; linked to intellectual disability | Neuronal development |
| ZDHHC17 | Palmitoyltransferase; modifies huntingtin | Neurodegeneration (Huntington's disease) |
| ZDHHC20 | Palmitoyltransferase; modifies EGFR | Cancer signaling and drug resistance |
| ZDHHC21 | Palmitoyltransferase; regulates endothelial function | Cardiovascular biology |
| ZDHHC23 | Palmitoyltransferase; expressed in Octopus sinensis paralarvae | Evolutionary conservation |
How Is protein-cysteine S-palmitoyltransferase activity Regulated?
The activity of protein-cysteine S-palmitoyltransferases (GO:0019706) is regulated at multiple levels. Expression of ZDHHC genes can be transcriptionally controlled by growth factors and stress signals, as suggested by transcriptomic profiling in lung adenocarcinoma where ZDHHC4/12/18/24 and APT2 show altered levels. Post-translationally, DHHC enzymes undergo auto-palmitoylation, which is required for their catalytic activity and can be reversed by depalmitoylases like APT2, creating a dynamic cycle. Additionally, the availability of palmitoyl-CoA, the substrate donor, links enzyme activity to cellular lipid metabolism. In non-model organisms such as Octopus sinensis, developmental stage-specific expression of palmitoyltransferase genes indicates temporal regulation during paralarval development.
protein-cysteine S-palmitoyltransferase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| ZDHHC4 | Lung adenocarcinoma progression | CRISPR knockout in A549 cells; xenograft mouse model |
| ZDHHC12 | Lung adenocarcinoma prognosis | Point mutation of catalytic DHHC motif; overexpression in H1299 cells |
| ZDHHC18 | Lung adenocarcinoma biomarker | Knock-in of tagged ZDHHC18 for localization studies |
| APT2 | Cancer and depalmitoylation imbalance | Knockout in cancer cell lines; rescue with wild-type APT2 |
| ZDHHC17 | Huntington's disease | Knock-in of mutant huntingtin; ZDHHC17 knockout neurons |
Cancer
Dysregulated protein-cysteine S-palmitoyltransferase activity is increasingly implicated in cancer. In lung adenocarcinoma, expression levels of ZDHHC4, ZDHHC12, ZDHHC18, ZDHHC24, and the depalmitoylase APT2 are associated with patient prognosis, suggesting they could serve as biomarkers or therapeutic targets. These enzymes may promote tumor growth by palmitoylating oncoproteins such as RAS, enhancing their membrane localization and signaling.
Neurodegeneration and Neurological Disorders
Palmitoylation is critical for synaptic function, and mutations in ZDHHC enzymes like ZDHHC9 and ZDHHC15 have been linked to X-linked intellectual disability. ZDHHC17 palmitoylates huntingtin, and altered palmitoylation contributes to Huntington's disease pathology. Thus, GO:0019706 dysfunction can disrupt neuronal signaling and contribute to neurodegeneration.
Infectious and Immune Disorders
Several viruses and intracellular pathogens exploit host palmitoyltransferases to modify their own proteins or host immune factors, facilitating immune evasion. For example, palmitoylation of viral glycoproteins is required for assembly and infectivity. Targeting GO:0019706 may therefore offer antiviral strategies.
From protein-cysteine S-palmitoyltransferase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does ZDHHC4 loss affect cancer cell proliferation? | CRISPR knockout in lung adenocarcinoma cell lines |
| How does a point mutation in the DHHC motif alter enzyme activity? | CRISPR point mutation (e.g., C→A) in ZDHHC12 |
| Where does ZDHHC18 localize in cells? | Knock-in of fluorescent tag (e.g., GFP) at endogenous locus |
| Does overexpression of ZDHHC24 promote tumor growth? | Overexpression via lentiviral transduction in cancer cells |
| What proteins are palmitoylated by ZDHHC5? | Knockout followed by proteomic palmitoylation profiling |
| Is APT2 required for depalmitoylation of specific substrates? | Knockout and rescue with catalytically dead APT2 |
How to Study the protein-cysteine S-palmitoyltransferase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| CRISPR knockout | Loss of gene function | Identify essential palmitoyltransferases in cancer cells |
| CRISPR point mutation | Specific amino acid change | Dissect catalytic DHHC motif residues |
| Knock-in tagging | Endogenous protein localization | Track ZDHHC18 trafficking in real time |
| Overexpression | Gain of function | Test oncogenic potential of ZDHHC24 |
| Acyl-RAC | Global palmitoylation levels | Compare wild-type vs. knockout cells |
| RNA-seq | Transcriptional changes | Identify co-regulated genes in patient cohorts |
| Bioinformatics | Sequence and network analysis | Predict DHHC domain conservation and interactions |
| Fluorescence microscopy | Subcellular localization | Visualize palmitoylation-dependent membrane targeting |
CRISPR-Based Genetic Screens
Genome-wide CRISPR knockout or activation screens can identify genes that modulate protein-cysteine S-palmitoyltransferase activity or its downstream effects. For example, screening for resistance to palmitoylation inhibitors can reveal synthetic lethal interactions with ZDHHC genes.
Proteomic Profiling of Palmitoylated Proteins
Click chemistry-based palmitoylation assays coupled with mass spectrometry (e.g., acyl-RAC) enable global identification of substrates modified by GO:0019706. Comparing wild-type and ZDHHC knockout cells reveals specific targets.
Transcriptomic and Bioinformatic Analysis
RNA-seq and differential expression analysis, as performed in lung adenocarcinoma and Octopus sinensis studies, can uncover co-regulated gene networks involving palmitoyltransferases and depalmitoylases. Bioinformatics tools predict DHHC domain conservation and potential substrates.
Imaging and Subcellular Localization
Fluorescence microscopy of tagged DHHC enzymes or palmitoylation reporters (e.g., GFP-based probes) visualizes dynamic localization and trafficking in live cells, linking GO:0019706 activity to membrane dynamics.
How CRISPR Can Be Used to Study GO:0019706 protein-cysteine S-palmitoyltransferase activity
Knockout
CRISPR knockout of ZDHHC genes (e.g., ZDHHC4, ZDHHC12) in cancer cell lines abolishes specific palmitoyltransferase activity, allowing researchers to assess loss-of-function phenotypes such as reduced proliferation or altered signaling. Knockout models are essential for validating whether a candidate gene is causally involved in GO:0019706-dependent processes.
Point Mutation
Introducing point mutations in the catalytic DHHC cysteine residue (e.g., C→A) via CRISPR base editing or homology-directed repair creates enzyme-dead variants that can distinguish catalytic activity from scaffolding functions. Such models are crucial for linking GO:0019706 activity to specific substrates and phenotypes.
Knock-in
Knock-in of epitope tags (e.g., FLAG, GFP) or reporter cassettes at endogenous ZDHHC loci enables real-time tracking of enzyme expression, localization, and interaction partners without overexpression artifacts. This approach helps map where GO:0019706 acts within cells.
Overexpression
CRISPR activation (CRISPRa) or lentiviral overexpression of ZDHHC genes can model gain-of-function states observed in cancers, such as elevated ZDHHC24 in lung adenocarcinoma. Overexpression studies help identify downstream signaling changes and potential therapeutic vulnerabilities.
How EDITGENE Supports protein-cysteine S-palmitoyltransferase activity Research
Researchers studying protein-cysteine S-palmitoyltransferase activity-related genes often need to determine whether a candidate gene is causally involved in a specific biological process or disease. EDITGENE provides a comprehensive suite of CRISPR-based services to accelerate this functional validation, from generating knockout cell lines to engineering precise point mutations and knock-in reporters.
Contact EDITGENE today to design your custom CRISPR model for protein-cysteine S-palmitoyltransferase activity research.
Frequently Asked Questions About protein-cysteine S-palmitoyltransferase activity
What is protein-cysteine S-palmitoyltransferase activity?
It is the enzymatic activity (GO:0019706) that transfers a palmitoyl group to cysteine residues on proteins, a reversible modification called S-palmitoylation.
What genes are involved in protein-cysteine S-palmitoyltransferase activity?
Genes encoding DHHC domain-containing enzymes, including ZDHHC4, ZDHHC12, ZDHHC18, ZDHHC24, and many others, as well as depalmitoylases like APT2.
What is the GO ID for protein-cysteine S-palmitoyltransferase activity?
The Gene Ontology ID is GO:0019706.
How is protein-cysteine S-palmitoyltransferase activity regulated?
It is regulated by enzyme expression levels, auto-palmitoylation, substrate availability, and opposing depalmitoylase activity.
What diseases are associated with protein-cysteine S-palmitoyltransferase activity?
Dysregulation is linked to cancers such as lung adenocarcinoma, neurodegenerative disorders, and intellectual disability.
What methods are used to study protein-cysteine S-palmitoyltransferase activity?
CRISPR knockout, point mutation, knock-in tagging, overexpression, proteomic palmitoylation assays, and RNA-seq are common approaches.
Can CRISPR be used to study protein-cysteine S-palmitoyltransferase activity?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models are powerful tools to dissect gene function in this pathway.
What is the reaction catalyzed by GO:0019706?
hexadecanoyl-CoA + L-cysteinyl-[protein] = CoA + S-hexadecanoyl-L-cysteinyl-[protein].
Which ZDHHC genes are prognostic biomarkers in lung adenocarcinoma?
ZDHHC4, ZDHHC12, ZDHHC18, ZDHHC24, and APT2 have been identified as prognostic biomarkers.
Is protein-cysteine S-palmitoyltransferase activity conserved in non-model organisms?
Yes, transcriptomic studies in Octopus sinensis suggest conservation of palmitoyltransferase gene expression during development.
Conclusion
Protein-cysteine S-palmitoyltransferase activity (GO:0019706) is a central regulatory mechanism in eukaryotic cells, controlling protein localization and signaling through reversible lipid modification. Its dysregulation contributes to cancer, neurodegeneration, and developmental disorders, making it a promising therapeutic target. Advances in CRISPR-based models and bioinformatics are accelerating our understanding of this enzymatic activity and its roles in health and disease.
References
- 1. Bian J et al.. 2024. Identification and prognostic biomarkers among ZDHHC4/12/18/24, and APT2 in lung adenocarcinoma.. Sci Rep 14(1):522 PMID: 38177255
- 2. Kim KT et al.. 2024. Transcriptome analysis of East Asian common octopus, Octopus sinensis, paralarvae.. Genes Genomics 46(8):955-966 PMID: 38922499
