論文

国際誌
2023年9月30日

Mechanical Stress Decreases the Amplitude of Twisting and Bending Fluctuations of Actin Filaments.

Journal of molecular biology
  • Kaoru Okura
  • ,
  • Tomoharu Matsumoto
  • ,
  • Akio Narita
  • ,
  • Hitoshi Tatsumi

開始ページ
168295
終了ページ
168295
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1016/j.jmb.2023.168295

A variety of biological roles of mechanical forces have been proposed in cell biology, such as cell signaling pathways for survival, development, growth, and differentiation. Mechanical forces alter the mechanical conditions within cells and their environment, which strongly influences the reorganization of the actin cytoskeleton. Single-molecule imaging studies of actin filaments have led to the hypothesis that the actin filament acts as a mechanosensor; e.g., increases in actin filament tension alter their conformation and affinity for regulatory proteins. However, our understanding of the molecular mechanisms underlying how tension modulates the mechanical behavior of a single actin filament is still incomplete. In this study, a direct measurement of the twisting and bending of a fluorescently labeled single actin filament under different tension levels by force application (0.8 ∼ 3.4 pN) was performed using single-molecule fluorescence polarization (SMFP) microscopy. The results showed that the amplitude of twisting and bending fluctuations of a single actin filament decreased with increasing tension. Electron micrograph analysis of tensed filaments also revealed that the fluctuations in the crossover length of actin filaments decreased with increasing filament tension. Possible molecular mechanisms underlying these results involving the binding of actin-binding proteins, such as cofilin, to the filament are discussed.

リンク情報
DOI
https://doi.org/10.1016/j.jmb.2023.168295
PubMed
https://www.ncbi.nlm.nih.gov/pubmed/37783285
ID情報
  • DOI : 10.1016/j.jmb.2023.168295
  • PubMed ID : 37783285

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