{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,16]],"date-time":"2026-03-16T15:26:25Z","timestamp":1773674785109,"version":"3.50.1"},"reference-count":65,"publisher":"MDPI AG","issue":"12","license":[{"start":{"date-parts":[[2021,6,12]],"date-time":"2021-06-12T00:00:00Z","timestamp":1623456000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100002261","name":"Russian Foundation for Basic Research","doi-asserted-by":"publisher","award":["20-04-00523"],"award-info":[{"award-number":["20-04-00523"]}],"id":[{"id":"10.13039\/501100002261","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>Point mutations in the genes encoding the skeletal muscle isoforms of tropomyosin can cause a range of muscle diseases. The amino acid substitution of Arg for Pro residue in the 90th position (R90P) in \u03b3-tropomyosin (Tpm3.12) is associated with congenital fiber type disproportion and muscle weakness. The molecular mechanisms underlying muscle dysfunction in this disease remain unclear. Here, we observed that this mutation causes an abnormally high Ca2+-sensitivity of myofilaments in vitro and in muscle fibers. To determine the critical conformational changes that myosin, actin, and tropomyosin undergo during the ATPase cycle and the alterations in these changes caused by R90P replacement in Tpm3.12, we used polarized fluorimetry. It was shown that the R90P mutation inhibits the ability of tropomyosin to shift towards the outer domains of actin, which is accompanied by the almost complete depression of troponin\u2019s ability to switch actin monomers off and to reduce the amount of the myosin heads weakly bound to F-actin at a low Ca2+. These changes in the behavior of tropomyosin and the troponin\u2013tropomyosin complex, as well as in the balance of strongly and weakly bound myosin heads in the ATPase cycle may underlie the occurrence of both abnormally high Ca2+-sensitivity and muscle weakness. BDM, an inhibitor of myosin ATPase activity, and W7, a troponin C antagonist, restore the ability of tropomyosin for Ca2+-dependent movement and the ability of the troponin\u2013tropomyosin complex to switch actin monomers off, demonstrating a weakening of the damaging effect of the R90P mutation on muscle contractility.<\/jats:p>","DOI":"10.3390\/ijms22126318","type":"journal-article","created":{"date-parts":[[2021,6,14]],"date-time":"2021-06-14T10:30:25Z","timestamp":1623666625000},"page":"6318","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Molecular Mechanisms of the Deregulation of Muscle Contraction Induced by the R90P Mutation in Tpm3.12 and the Weakening of This Effect by BDM and W7"],"prefix":"10.3390","volume":"22","author":[{"given":"Yurii S.","family":"Borovikov","sequence":"first","affiliation":[{"name":"Laboratory of Molecular Basis of Cell Motility, Institute of Cytology of the Russian Academy of Sciences, 4 Tikhoretsky Ave., 194064 Saint Petersburg, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Daria D.","family":"Andreeva","sequence":"additional","affiliation":[{"name":"Laboratory of Molecular Basis of Cell Motility, Institute of Cytology of the Russian Academy of Sciences, 4 Tikhoretsky Ave., 194064 Saint Petersburg, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Stanislava V.","family":"Avrova","sequence":"additional","affiliation":[{"name":"Laboratory of Molecular Basis of Cell Motility, Institute of Cytology of the Russian Academy of Sciences, 4 Tikhoretsky Ave., 194064 Saint Petersburg, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Vladimir V.","family":"Sirenko","sequence":"additional","affiliation":[{"name":"Laboratory of Molecular Basis of Cell Motility, Institute of Cytology of the Russian Academy of Sciences, 4 Tikhoretsky Ave., 194064 Saint Petersburg, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8045-7419","authenticated-orcid":false,"given":"Armen O.","family":"Simonyan","sequence":"additional","affiliation":[{"name":"Laboratory of Molecular Basis of Cell Motility, Institute of Cytology of the Russian Academy of Sciences, 4 Tikhoretsky Ave., 194064 Saint Petersburg, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Charles S.","family":"Redwood","sequence":"additional","affiliation":[{"name":"Radcliffe Department of Medicine, University of Oxford, John Radcliffe Hospital, Oxford OX3 9DU, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0601-5978","authenticated-orcid":false,"given":"Olga E.","family":"Karpicheva","sequence":"additional","affiliation":[{"name":"Laboratory of Molecular Basis of Cell Motility, Institute of Cytology of the Russian Academy of Sciences, 4 Tikhoretsky Ave., 194064 Saint Petersburg, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2021,6,12]]},"reference":[{"key":"ref_1","first-page":"4836","article-title":"Electron Microscopy: From 2D to 3D Images with Special Reference to Muscle","volume":"25","year":"2015","journal-title":"Eur. 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