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-Structure paper
タイトル | Structural basis of actin filament assembly and aging. |
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ジャーナル・号・ページ | Nature, Vol. 611, Issue 7935, Page 374-379, Year 2022 |
掲載日 | 2022年10月26日 |
著者 | Wout Oosterheert / Björn U Klink / Alexander Belyy / Sabrina Pospich / Stefan Raunser / |
PubMed 要旨 | The dynamic turnover of actin filaments (F-actin) controls cellular motility in eukaryotes and is coupled to changes in the F-actin nucleotide state. It remains unclear how F-actin hydrolyses ATP and ...The dynamic turnover of actin filaments (F-actin) controls cellular motility in eukaryotes and is coupled to changes in the F-actin nucleotide state. It remains unclear how F-actin hydrolyses ATP and subsequently undergoes subtle conformational rearrangements that ultimately lead to filament depolymerization by actin-binding proteins. Here we present cryo-electron microscopy structures of F-actin in all nucleotide states, polymerized in the presence of Mg or Ca at approximately 2.2 Å resolution. The structures show that actin polymerization induces the relocation of water molecules in the nucleotide-binding pocket, activating one of them for the nucleophilic attack of ATP. Unexpectedly, the back door for the subsequent release of inorganic phosphate (P) is closed in all structures, indicating that P release occurs transiently. The small changes in the nucleotide-binding pocket after ATP hydrolysis and P release are sensed by a key amino acid, amplified and transmitted to the filament periphery. Furthermore, differences in the positions of water molecules in the nucleotide-binding pocket explain why Ca-actin shows slower polymerization rates than Mg-actin. Our work elucidates the solvent-driven rearrangements that govern actin filament assembly and aging and lays the foundation for the rational design of drugs and small molecules for imaging and therapeutic applications. |
リンク | Nature / PubMed:36289337 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 2.15 - 2.24 Å |
構造データ | EMDB-15104, PDB-8a2r: EMDB-15105, PDB-8a2s: EMDB-15106, PDB-8a2t: EMDB-15107, PDB-8a2u: EMDB-15108, PDB-8a2y: EMDB-15109, PDB-8a2z: |
化合物 | ChemComp-ADP: ChemComp-MG: ChemComp-BEF: ChemComp-HOH: ChemComp-PO4: ChemComp-CA: |
由来 |
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キーワード | STRUCTURAL PROTEIN / actin / cytoskeleton / filament / nucleotide state |