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Shape matters in protein mobility within membranes.


ABSTRACT: The lateral mobility of proteins within cell membranes is usually thought to be dependent on their size and modulated by local heterogeneities of the membrane. Experiments using single-particle tracking on reconstituted membranes demonstrate that protein diffusion is significantly influenced by the interplay of membrane curvature, membrane tension, and protein shape. We find that the curvature-coupled voltage-gated potassium channel (KvAP) undergoes a significant increase in protein mobility under tension, whereas the mobility of the curvature-neutral water channel aquaporin 0 (AQP0) is insensitive to it. Such observations are well explained in terms of an effective friction coefficient of the protein induced by the local membrane deformation.

SUBMITTER: Quemeneur F 

PROVIDER: S-EPMC3986167 | biostudies-literature | 2014 Apr

REPOSITORIES: biostudies-literature

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Shape matters in protein mobility within membranes.

Quemeneur François F   Sigurdsson Jon K JK   Renner Marianne M   Atzberger Paul J PJ   Bassereau Patricia P   Lacoste David D  

Proceedings of the National Academy of Sciences of the United States of America 20140324 14


The lateral mobility of proteins within cell membranes is usually thought to be dependent on their size and modulated by local heterogeneities of the membrane. Experiments using single-particle tracking on reconstituted membranes demonstrate that protein diffusion is significantly influenced by the interplay of membrane curvature, membrane tension, and protein shape. We find that the curvature-coupled voltage-gated potassium channel (KvAP) undergoes a significant increase in protein mobility und  ...[more]

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