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Membrane curvature: how BAR domains bend bilayers
Joshua Zimmerberg1, Stuart McLaughlin
1Laboratory of Cellular and Molecular Biophysics, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland 20892, USA.
Current Biology : CB
|March 27, 2004
Summary
The BAR domain protein acts like a banana, binding to cell membranes. Its unique shape senses and shapes membrane curvature through electrostatic interactions.
Area of Science:
- Biochemistry
- Structural Biology
- Cell Biology
Background:
- Membrane curvature is crucial for cellular processes.
- The BAR domain's role in membrane dynamics was previously unclear.
Purpose of the Study:
- To elucidate the structural basis of BAR domain-mediated membrane interaction.
- To understand how BAR domains sense and generate membrane curvature.
Main Methods:
- X-ray crystallography to determine the structure of a BAR domain.
- Biophysical assays to assess membrane binding and curvature induction.
Main Results:
- A novel banana-like structure for the BAR domain was revealed.
- The concave, positively charged surface of the BAR domain mediates electrostatic membrane binding.
- The structure explains how BAR domains can both sense and induce membrane curvature.
Conclusions:
- The BAR domain is a versatile membrane-binding module.
- Its structure directly relates to its function in shaping cellular membranes.