Actin binding domain of filamin distinguishes posterior from anterior actin filaments in migrating Dictyostelium cells

Keitaro Shibata, Akira Nagasaki, Hiroyuki Adachi, Taro Q.P. Uyeda*

*この研究の対応する著者

研究成果: Article査読

4 被引用数 (Scopus)

抄録

Actin filaments in different parts of a cell interact with specific actin binding proteins (ABPs) and perform different functions in a spatially regulated manner. However, the mechanisms of those spatially-defined interactions have not been fully elucidated. If the structures of actin filaments differ in different parts of a cell, as suggested by previous in vitro structural studies, ABPs may distinguish these structural differences and interact with specific actin filaments in the cell. To test this hypothesis, we followed the translocation of the actin binding domain of filamin (ABDFLN) fused with photoswitchable fluorescent protein (mKikGR) in polarized Dictyostelium cells. When ABDFLN-mKikGR was photoswitched in the middle of a polarized cell, photoswitched ABDFLN-mKikGR rapidly translocated to the rear of the cell, even though actin filaments were abundant in the front. The speed of translocation (>3 µm/s) was much faster than that of the retrograde flow of cortical actin filaments. Rapid translocation of ABDFLN-mKikGR to the rear occurred normally in cells lacking GAPA, the only protein, other than actin, known to bind ABDFLN. We suggest that ABDFLN recog nizes a certain feature of actin filaments in the rear of the cell and selectively binds to them, contributing to the posterior localization of filamin.

本文言語English
ページ(範囲)321-331
ページ数11
ジャーナルBiophysics and physicobiology
13
DOI
出版ステータスPublished - 2016

ASJC Scopus subject areas

  • 生物理学
  • 生化学
  • 分子生物学
  • 生理学
  • 生化学、遺伝学、分子生物学(その他)

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