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-Structure paper
| タイトル | Cryo-EM reveals how cardiomyopathy therapeutic drugs modulate the myosin motors of the heart. |
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| ジャーナル・号・ページ | Sci Adv, Vol. 12, Issue 18, Page eaed6472, Year 2026 |
| 掲載日 | 2026年4月29日 |
著者 | Arun Kumar Somavarapu / Jinghua Ge / Christopher M Yengo / Roger Craig / Raul Padron / ![]() |
| PubMed 要旨 | Genetic mutations in myosin, the motor protein that powers the heartbeat, are linked to inherited hypertrophic and dilated cardiomyopathies. Mavacamten and omecamtiv mecarbil are therapeutic, myosin- ...Genetic mutations in myosin, the motor protein that powers the heartbeat, are linked to inherited hypertrophic and dilated cardiomyopathies. Mavacamten and omecamtiv mecarbil are therapeutic, myosin-targeted drugs designed to treat these myopathies, but their mechanism of action has remained unclear. Using single-particle cryo-EM, we determined near-atomic resolution structures of wild-type, mavacamten-bound, and omecamtiv mecarbil-bound myosin molecules. Across all conditions, we observe two distinct, alternate conformations of myosin, not previously reported. We show how mavacamten stabilizes one conformation by reinforcing key electrostatic interfaces in the molecule, whereas omecamtiv mecarbil weakens these interfaces, favoring the second structure. This remodeling elucidates previously unclear allosteric mechanisms through which these drugs either inhibit or enhance myosin activity, countering the deleterious impacts of disease. These findings reveal how drugs modulate myosin structure to control cardiac contractility. |
リンク | Sci Adv / PubMed:42054467 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.0 - 4.5 Å |
| 構造データ | EMDB-73268, PDB-9yop: EMDB-73283, PDB-9yp4: EMDB-73288, PDB-9yp9: EMDB-73362, PDB-9yr7: EMDB-73367, PDB-9yrg: EMDB-73368, PDB-9yrh: |
| 化合物 | ![]() ChemComp-ADP: ![]() ChemComp-PO4: ![]() ChemComp-2OW: ![]() ChemComp-XB2: |
| 由来 |
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キーワード | CONTRACTILE PROTEIN / Cardiac Myosin / Interacting Heads Motif / Actin Binding / Omecamtiv Mecarbil / Mavacamten |
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