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-Structure paper
タイトル | Mechanism of actin filament branch formation by Arp2/3 complex revealed by a high-resolution cryo-EM structureof the branch junction. |
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ジャーナル・号・ページ | Proc Natl Acad Sci U S A, Vol. 119, Issue 49, Page e2206722119, Year 2022 |
掲載日 | 2022年12月6日 |
著者 | Steven Z Chou / Moon Chatterjee / Thomas D Pollard / |
PubMed 要旨 | We reconstructed the structure of actin filament branch junctions formed by fission yeast Arp2/3 complex at 3.5 Å resolution from images collected by electron cryo-microscopy. During specimen ...We reconstructed the structure of actin filament branch junctions formed by fission yeast Arp2/3 complex at 3.5 Å resolution from images collected by electron cryo-microscopy. During specimen preparation, all of the actin subunits and Arp3 hydrolyzed their bound adenosine triphosphate (ATP) and dissociated the γ-phosphate, but Arp2 retained the γ-phosphate. Binding tightly to the side of the mother filament and nucleating the daughter filament growing as a branch requires Arp2/3 complex to undergo a dramatic conformational change where two blocks of structure rotate relative to each other about 25° to align Arp2 and Arp3 as the first two subunits in the branch. During branch formation, Arp2/3 complex acquires more than 8,000 Å of new buried surface, accounting for the stability of the branch. Inactive Arp2/3 complex binds only transiently to the side of an actin filament, because its conformation allows only a subset of the interactions found in the branch junction. |
リンク | Proc Natl Acad Sci U S A / PubMed:36442092 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 3.5 Å |
構造データ | EMDB-27962, PDB-8e9b: |
化合物 | ChemComp-MG: ChemComp-ADP: ChemComp-ATP: |
由来 |
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キーワード | STRUCTURAL PROTEIN / Arp2-3 complex / branch juction / polymerization |