Effect of Cardiomyopathic Mutations in Tropomyosin on Calcium Regulation of the Actin—Myosin Interaction in Skeletal Muscle
- Authors: Kopylova G.V.1, Shchepkin D.V.1, Borovkov D.I.1,2, Matyushenko A.M.3
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Affiliations:
- Institute of Immunology and Physiology, Ural Division of the Russian Academy of Sciences
- B. N. Yeltsin Ural Federal University
- A. N. Bach Institute of Biochemistry, Federal Research Center of Biotechnology, Russian Academy of Sciences
- Issue: Vol 162, No 1 (2016)
- Pages: 42-44
- Section: Biophysics and Biochemistry
- URL: https://journals.rcsi.science/0007-4888/article/view/237888
- DOI: https://doi.org/10.1007/s10517-016-3540-x
- ID: 237888
Cite item
Abstract
Tropomyosin plays an important role in the regulation of actin—myosin interaction in striated muscles. Mutations in the tropomyosin gene disrupt actin—myosin interaction and lead to myopathies and cardiomyopathies. Tropomyosin with mutations in the α-chain is expressed in both the myocardium and skeletal muscles. We studied the effect of mutations in the α-chain of tropomyosin related to hypertrophic (D175N and E180G) and dilated cardiomyopathies (E40K and E54K) on calcium regulation of the actin–myosin interaction in skeletal muscles. We analyzed the calcium-dependent sliding velocity of reconstructed thin filaments containing F-actin, troponin, and tropomyosin over myosin surface in an in vitro motility assay. Mutations D175N and E180G in tropomyosin increased the sliding velocity and its calcium sensitivity, while mutation E40K reduced both these parameters. E54K mutation increased the sliding velocity of thin filaments, but did not affect its calcium sensitivity.
About the authors
G. V. Kopylova
Institute of Immunology and Physiology, Ural Division of the Russian Academy of Sciences
Author for correspondence.
Email: g_rodionova@mail.ru
Russian Federation, Moscow
D. V. Shchepkin
Institute of Immunology and Physiology, Ural Division of the Russian Academy of Sciences
Email: g_rodionova@mail.ru
Russian Federation, Moscow
D. I. Borovkov
Institute of Immunology and Physiology, Ural Division of the Russian Academy of Sciences; B. N. Yeltsin Ural Federal University
Email: g_rodionova@mail.ru
Russian Federation, Moscow; Ekaterinburg
A. M. Matyushenko
A. N. Bach Institute of Biochemistry, Federal Research Center of Biotechnology, Russian Academy of Sciences
Email: g_rodionova@mail.ru
Russian Federation, Moscow
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