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Sealed with a twist: complexin and the synaptic SNARE complex.

Karla E Marz¹, Phyllis I Hanson

¹Department of Cell Biology and Physiology, Washington University School of Medicine, 660 South Euclid Avenue, Box 8228, St Louis, MO 6311, USA.

Trends in Neurosciences

|July 20, 2002

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Complexins are essential for calcium-dependent neurotransmitter release. Structural and NMR data reveal complexins stabilize the SNARE complex, crucial for vesicle and target membrane fusion during neurotransmission.

Area of Science:

Neuroscience
Molecular Biology
Biochemistry

Background:

Neurotransmitter release is a calcium-dependent process.
The SNARE complex, comprising syntaxin and synaptobrevin, mediates membrane fusion.
Complexins are known regulators of neurotransmitter release.

Purpose of the Study:

To elucidate the structural role of complexins in the SNARE complex.
To understand how complexins regulate Ca(2+)-dependent neurotransmitter release.

Main Methods:

X-ray crystallography to determine the structure of complexin I bound to the SNARE complex.
Nuclear Magnetic Resonance (NMR) spectroscopy to gather structural data.
Knockout experiments to assess the function of complexins.

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Main Results:

The crystal structure reveals complexin I binding within the groove of the SNARE complex, between syntaxin and synaptobrevin coils.
NMR data complements the structural findings.
Knockout experiments confirm complexins' critical role in Ca(2+)-dependent neurotransmitter release.

Conclusions:

Complexins stabilize the SNARE complex during its formation.
This stabilization mechanism is key to regulating neurotransmitter release from synaptic vesicles.