Structural basis for cofilin binding and actin filament disassembly

Kotaro Tanaka, Shuichi Takeda, Kaoru Mitsuoka, Toshiro Oda, Chieko Kimura-Sakiyama, Yuichiro Maéda, Akihiro Narita

Research output: Contribution to journalArticlepeer-review

64 Citations (Scopus)

Abstract

Actin depolymerizing factor (ADF) and cofilin accelerate actin dynamics by severing and disassembling actin filaments. Here, we present the 3.8 Å resolution cryo-EM structure of cofilactin (cofilin-decorated actin filament). The actin subunit structure of cofilactin (C-form) is distinct from those of F-actin (F-form) and monomeric actin (G-form). During the transition between these three conformations, the inner domain of actin (subdomains 3 and 4) and the majority of subdomain 1 move as two separate rigid bodies. The cofilin-actin interface consists of three distinct parts. Based on the rigid body movements of actin and the three cofilin-actin interfaces, we propose models for the cooperative binding of cofilin to actin, preferential binding of cofilin to ADP-bound actin filaments and cofilin-mediated severing of actin filaments.

Original languageEnglish
Article number1860
JournalNature communications
Volume9
Issue number1
DOIs
Publication statusPublished - Dec 1 2018
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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