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Cysteine string proteins and presynaptic function

J A Umbach¹, A Mastrogiacomo, C B Gundersen

¹Department of Molecular and Medical Pharmacology, UCLA School of Medicine 90024, USA.

Journal of Physiology, Paris

|January 1, 1995

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Cysteine string proteins (csps) are vital for nerve terminal excitation-secretion. Their fatty acylation suggests a direct role in membrane fusion during exocytosis, guiding future research.

Area of Science:

Neuroscience
Molecular Biology
Cell Biology

Background:

Synaptic vesicle proteins play critical roles in neurotransmission.
Cysteine string proteins (csps) are a novel family of these proteins.
Previous studies highlight csps' involvement in excitation-secretion.

Purpose of the Study:

To review investigations on cysteine string proteins (csps).
To explore the function of csps in nerve terminal excitation-secretion.
To hypothesize the role of csps in membrane fusion during exocytosis.

Main Methods:

Review of existing research on csps.
Analysis of data from Drosophila csp mutants.
Examination of the post-translational modifications of csps.

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Main Results:

Cysteine string proteins (csps) are essential for the excitation-secretion machinery at nerve terminals.
The exact role of csps in calcium influx versus exocytosis remains under investigation.
Csps undergo extensive fatty acylation, with up to 12 of 13 cysteine residues modified.

Conclusions:

Cysteine string proteins (csps) are crucial for nerve terminal function.
Fatty acylation of csps suggests a direct role in membrane fusion during exocytosis.
Hypotheses on csps' role in lipid flow and membrane fusion provide a framework for future studies.