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Mechanism of Blebbistatin Inhibition of Myosin II

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Kovács, Mihály, Tóth, Judit, Hetényi, Csaba, Málnási-Csizmadia, András, Sellers, James R.·2004·Journal of Biological Chemistry

Abstract

Blebbistatin is a recently discovered small molecule inhibitor showing high affinity and selectivity toward myosin II. Here we report a detailed investigation of its mechanism of inhibition. Blebbistatin does not compete with nucleotide binding to the skeletal muscle myosin subfragment-1. The inhibitor preferentially binds to the ATPase intermediate with ADP and phosphate bound at the active site, and it slows down phosphate release. Blebbistatin interferes neither with binding of myosin to actin nor with ATP-induced actomyosin dissociation. Instead, it blocks the myosin heads in a products complex with low actin affinity. Blind docking molecular simulations indicate that the productive blebbistatin-binding site of the myosin head is within the aqueous cavity between the nucleotide pocket and the cleft of the actin-binding interface. The property that blebbistatin blocks myosin II in an actin-detached state makes the compound useful both in muscle physiology and in exploring the cellular function of cytoplasmic myosin II isoforms, whereas the stabilization of a specific myosin intermediate confers a great potential in structural studies.

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Metadata

Authors
Kovács, M., Tóth, J., Hetényi, C., Málnási-Csizmadia, A., & Sellers, J. R.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2004-08
Volume
279
Issue
34
Pages
35557-35563
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2009582775
Cited by
1,019
References
21
FWCI
13.22
Type
journal article
Language
en
Open access
hybrid

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CoChat. (2026). Citation check: Mechanism of Blebbistatin Inhibition of Myosin II. https://app.cochat.ai/papers/10.1074/jbc.m405319200
The paper
Kovács, M., Tóth, J., Hetényi, C., Málnási-Csizmadia, A., & Sellers, J. R. (2004). Mechanism of Blebbistatin Inhibition of Myosin II. Journal of Biological Chemistry. https://doi.org/10.1074/jbc.m405319200

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

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