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Extensive lipidation of a Torpedo cysteine string protein
C B Gundersen1, A Mastrogiacomo, K Faull
1Department of Molecular and Medical Pharmacology, UCLA School of Medicine 90024.
The Journal of Biological Chemistry
|July 29, 1994
Summary
Cysteine string proteins, rich in lipid modifications, possess an amphipathic structure ideal for mediating membrane fusion events during neurotransmitter release.
Area of Science:
- Neuroscience
- Molecular Biology
- Biochemistry
Background:
- Cysteine string proteins are low-mass components of synaptic vesicle membranes.
- Their primary sequence features a unique cysteine-rich motif.
Purpose of the Study:
- To investigate the structural and functional properties of cysteine string proteins.
- To explore their role in synaptic vesicle membrane interactions.
Main Methods:
- Analysis of protein primary sequence.
- Investigation of cysteine residue modification.
- Characterization of protein lipidation and structure.
Main Results:
- Cysteine string proteins exhibit extensive lipidation of cysteine residues, with at least 11 of 13 cysteines modified by palmitoyl moieties in the Torpedo protein.
- This fatty acylation results in a distinct hydrophobic domain flanked by polar termini, creating an amphipathic structure.
- The amphipathic nature positions these proteins to interact at membrane interfaces.
Conclusions:
- Cysteine string proteins' amphipathic structure is well-suited for mediating events at membrane interfaces.
- These proteins are strong candidates for involvement in exocytotic membrane fusion processes.