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Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy

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Constitutive versus regulated SNARE assembly: a structural basis.

Yong Chen¹, Yibin Xu, Fan Zhang

¹Department of Biochemistry, Biophysics and Molecular Biology, Iowa State University, Ames, IA 50011, USA.

The EMBO Journal

|February 7, 2004

Summary

This summary is machine-generated.

Yeast SNAREs spontaneously fuse membranes, unlike regulated neuronal SNAREs. The distinct v-SNARE-membrane interaction dictates whether cell membrane fusion is constitutive or regulated.

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Area of Science:

Cell Biology
Molecular Biology
Biophysics

Background:

SNARE complex formation drives intracellular membrane fusion.
Neuronal SNAREs require tight regulation via v-SNARE-membrane interactions for fusion.
Yeast SNAREs, involved in protein trafficking, exhibit different fusion dynamics.

Purpose of the Study:

To investigate the molecular determinants differentiating regulated and constitutive membrane fusion.
To compare the v-SNARE-membrane interactions in neuronal versus yeast SNARE families.
To elucidate the structural basis for distinct SNARE complex formation and membrane fusion activities.

Main Methods:

Electron Paramagnetic Resonance (EPR) spectroscopy for structural analysis.
Reconstitution assays to study membrane fusion.
Comparative analysis of neuronal and yeast SNARE families.

Main Results:

Yeast SNARE complex formation is spontaneous, promoting membrane fusion.
Neuronal SNARE complex formation is regulated, and reconstituted neuronal SNAREs inhibit fusion.
EPR revealed yeast v-SNARE coiled-coils are membrane-accessible, unlike the deeply inserted neuronal v-SNARE membrane-proximal region.

Conclusions:

The v-SNARE-membrane interaction is a key factor in determining constitutive versus regulated membrane fusion.
Structural differences in v-SNARE interaction with membranes explain functional divergence between yeast and neuronal SNAREs.
Understanding these interactions provides insights into cellular membrane trafficking regulation.