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Updated: Jun 24, 2026

Detection of Protein Palmitoylation in Cultured Hippocampal Neurons by Immunoprecipitation and Acyl-Biotin Exchange (ABE)
Published on: February 18, 2013
Neuronal palmitoyl acyl transferases exhibit distinct substrate specificity.
Kun Huang1, Shaun Sanders, Roshni Singaraja
1Centre for Molecular Medicine and Therapeutics, University of British Columbia, Vancouver, BC V5Z 4H4, Canada.
Palmitoyltransferases (PATs) show substrate specificity. Specific regulatory domains outside the DHHC domain determine which proteins, like huntingtin, individual PATs modify via palmitoylation.
Area of Science:
- Biochemistry
- Molecular Biology
- Neuroscience
Background:
- Palmitoylation, a lipid modification of cysteine residues, regulates protein function and trafficking.
- Twenty-three mammalian DHHC palmitoyl acyl transferases (PATs) have been identified, raising questions about their substrate specificity.
Purpose of the Study:
- To investigate the substrate specificity of four neuronal PATs: DHHC-3, DHHC-8, HIP14L (DHHC-13), and HIP14 (DHHC-17).
- To determine the role of regulatory domains in PAT-substrate interactions.
Main Methods:
- Acyl-biotin exchange palmitoylation assay in COS cells.
- Exogenous expression of PATs and substrates.
- Lentiviral siRNA-mediated knockdown in cultured rat cortical neurons.
- Domain swapping experiments by fusing HIP14 ankyrin repeat domain to DHHC-3.
Main Results:
- HIP14L and HIP14 specifically modulate huntingtin palmitoylation.
- DHHC-8 modulates paralemmin-1 palmitoylation.
- DHHC-3 exhibited the least substrate specificity in vitro.
- Fusion of HIP14 ankyrin repeat domain to DHHC-3 conferred huntingtin substrate specificity to DHHC-3.
Conclusions:
- Individual PATs possess distinct substrate preferences.
- Regulatory domains outside the catalytic DHHC domain are critical for determining PAT-substrate specificity.
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