Spontaneous structural changes in actin regulate G-F transformation.
basic_science · Level V
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- Record sourced from PubMed, PMID 23144776.
- Also identified by DOI 10.1371/journal.pone.0045864 and PMC identifier PMC2895631.
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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.