Flightless-I (Fli-I) regulates the actin assembly activity of diaphanous-related formins (DRFs) Daam1 and mDia1 in cooperation with active Rho GTPase

Tomohito Higashi, Tomoyuki Ikeda, Takaaki Murakami, Ryutaro Shirakawa, Mitsunori Kawato, Katsuya Okawa, Mikio Furuse, Takeshi Kimura, Toru Kita, Hisanori Horiuchi

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

Eukaryotic cells dynamically reorganize the actin cytoskeleton to regulate various cellular activities, such as cell shape change, cell motility, cytokinesis, and vesicular transport. Diaphanous-related formins (DRFs), such as Daam1 and mDia1, play central roles in actin dynamics through assembling linear actin filaments. It has been reported that the GTP-bound active Rho binds directly to DRFs and partially unleashes the intramolecular autoinhibition of DRFs. However, whether proteins other than Rho involve the regulation of the actin assembly activity of DRFs has been unclear. Here, we show that Flightless-I (Fli-I), a gelsolin family protein essential for early development, binds directly to Daam1 and mDia1. Fli-I enhances the intrinsic actin assembly activity of Daam1 and mDia1 in vitro and is required for Daam1-induced actin assembly in living cells. Furthermore, Fli-I promotes the GTP-bound active Rhomediated relief of the autoinhibition of Daam1 and mDia1. Thus, Fli-I is a novel positive regulator of Rho-induced linear actin assembly mediated by DRFs.

Original languageEnglish
Pages (from-to)16231-16238
Number of pages8
JournalJournal of Biological Chemistry
Volume285
Issue number21
DOIs
Publication statusPublished - 2010 May 21

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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