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Spontaneous structural changes in actin regulate G-F transformation.


ABSTRACT: Transformations between G- (monomeric) and F-actin (polymeric) are important in cellular behaviors such as migration, cytokinesis, and morphing. In order to understand these transitions, we combined single-molecule Förster resonance energy transfer with total internal reflection fluorescence microscopy to examine conformational changes of individual actin protomers. We found that the protomers can take different conformational states and that the transition interval is in the range of hundreds of seconds. The distribution of these states was dependent on the environment, suggesting that actin undergoes spontaneous structural changes that accommodate itself to polymerization.

SUBMITTER: Morimatsu M 

PROVIDER: S-EPMC3489878 | biostudies-literature | 2012

REPOSITORIES: biostudies-literature

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Spontaneous structural changes in actin regulate G-F transformation.

Morimatsu Masatoshi M   Togashi Yuichi Y   Nishikawa So S   Sugawa Mitsuhiro M   Iwane Atsuko H AH   Yanagida Toshio T  

PloS one 20121105 11


Transformations between G- (monomeric) and F-actin (polymeric) are important in cellular behaviors such as migration, cytokinesis, and morphing. In order to understand these transitions, we combined single-molecule Förster resonance energy transfer with total internal reflection fluorescence microscopy to examine conformational changes of individual actin protomers. We found that the protomers can take different conformational states and that the transition interval is in the range of hundreds o  ...[more]

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