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-Structure paper
| タイトル | Actin arginylation alters myosin engagement and F-actin patterning despite structural conservation. |
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| ジャーナル・号・ページ | J Cell Biol, Vol. 225, Issue 1, Year 2026 |
| 掲載日 | 2026年1月5日 |
著者 | Clyde Savio Pinto / Saskia E Bakker / Andrejus Suchenko / Isabella M Kolodny / Hamdi Hussain / Tomoyuki Hatano / Karuna Sampath / Krishna Chinthalapudi / Sarah M Heissler / Masanori Mishima / Mohan Balasubramanian / ![]() |
| PubMed 要旨 | Actin is a conserved protein with crucial roles in cell polarity, division, and muscle contraction. Its function is regulated in part by posttranslational modifications, one of which is N-terminal ...Actin is a conserved protein with crucial roles in cell polarity, division, and muscle contraction. Its function is regulated in part by posttranslational modifications, one of which is N-terminal arginylation. What is the structure of arginylated-β-actin (R-β-actin), and how does it regulate F-actin function? Here we report the 3.6 Å structures of ADP-R-β-actin filaments, which are nearly identical to that of non-arginylated F-actin. In vitro assays reveal that the interaction between myosin-II and actin is altered upon actin arginylation, characterized by frequent detachment of R-actin filaments from myosin-II. In vivo, replacement of the only actin gene in Schizosaccharomyces pombe with a synthetic gene encoding R-Sp-actin reduces Arp2/3-based actin patches while thickening formin-induced actin cables. Consistent with defective interactions between myosin-II and R-actin filaments, assembly and constriction of the cytokinetic actomyosin ring are perturbed in R-Sp-actin cells. Thus, despite structural similarity of arginylated and non-arginylated actin filaments, actin arginylation affects F-actin assortment into distinct subcellular structures and its interaction with myosin-II. |
リンク | J Cell Biol / PubMed:41236477 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.499 Å |
| 構造データ | EMDB-16776, PDB-8cog: |
| 化合物 | ![]() ChemComp-ADP: ![]() ChemComp-MG: |
| 由来 |
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キーワード | CONTRACTILE PROTEIN / actin / methylated / filament |
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