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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Acta Naturae</journal-id><journal-title-group><journal-title xml:lang="en">Acta Naturae</journal-title><trans-title-group xml:lang="ru"><trans-title>Acta Naturae</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2075-8251</issn><publisher><publisher-name xml:lang="en">Acta Naturae Ltd</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">10597</article-id><article-id pub-id-type="doi">10.32607/20758251-2013-5-3-126-129</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Short communications</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Краткие сообщения</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Stabilization of the Central Part of Tropomyosin Molecule Alters the Ca 2+-sensitivity of Actin-Myosin Interaction</article-title><trans-title-group xml:lang="ru"><trans-title>Стабилизация центральной части тропомиозина изменяет чувствительность актин-миозинового взаимодействия к ионам кальция</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Shchepkin</surname><given-names>D. V.</given-names></name><name xml:lang="ru"><surname>Щепкин</surname><given-names>Д. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>levitsky@inbi.ras.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Matyushenko</surname><given-names>A. M.</given-names></name><name xml:lang="ru"><surname>Матюшенко</surname><given-names>A. M.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>levitsky@inbi.ras.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kopylova</surname><given-names>G. V.</given-names></name><name xml:lang="ru"><surname>Копылова</surname><given-names>Г. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>levitsky@inbi.ras.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Artemova</surname><given-names>N. V.</given-names></name><name xml:lang="ru"><surname>Артемова</surname><given-names>Н. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>levitsky@inbi.ras.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Bershitsky</surname><given-names>S. Y.</given-names></name><name xml:lang="ru"><surname>Бершицкий</surname><given-names>С. Ю.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>levitsky@inbi.ras.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Tsaturyan</surname><given-names>A. K.</given-names></name><name xml:lang="ru"><surname>Цатурян</surname><given-names>A. K.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>levitsky@inbi.ras.ru</email><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Levitsky</surname><given-names>D. I.</given-names></name><name xml:lang="ru"><surname>Левицкий</surname><given-names>Д. И.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>levitsky@inbi.ras.ru</email><xref ref-type="aff" rid="aff2"/><xref ref-type="aff" rid="aff4"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Institute of Immunology and Physiology</institution></aff><aff><institution xml:lang="ru">Институт иммунологии и физиологии УрО РАН</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Bach Institute of Biochemistry, Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт биохимии им. А.Н. Баха РАН</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">Institute of Mechanics, Lomonosov Moscow State University</institution></aff><aff><institution xml:lang="ru">Институт механики Московского государственного университета им. М.В. Ломоносова</institution></aff></aff-alternatives><aff-alternatives id="aff4"><aff><institution xml:lang="en">Belozersky Institute of Physico-Chemical Biology</institution></aff><aff><institution xml:lang="ru">НИИ физико-химической биологии им. А.Н. Белозерского Московского государственного университета им. М.В. Ломоносова</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2013-09-15" publication-format="electronic"><day>15</day><month>09</month><year>2013</year></pub-date><volume>5</volume><issue>3</issue><issue-title xml:lang="en">VOL 5, NO3 (2013)</issue-title><issue-title xml:lang="ru">ТОМ 5, №3 (2013)</issue-title><fpage>126</fpage><lpage>129</lpage><history><date date-type="received" iso-8601-date="2020-01-17"><day>17</day><month>01</month><year>2020</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2013, Shchepkin D.V., Matyushenko A.M., Kopylova G.V., Artemova N.V., Bershitsky S.Y., Tsaturyan A.K., Levitsky D.I.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2013, Щепкин Д.В., Матюшенко A.M., Копылова Г.В., Артемова Н.В., Бершицкий С.Ю., Цатурян A.K., Левицкий Д.И.</copyright-statement><copyright-year>2013</copyright-year><copyright-holder xml:lang="en">Shchepkin D.V., Matyushenko A.M., Kopylova G.V., Artemova N.V., Bershitsky S.Y., Tsaturyan A.K., Levitsky D.I.</copyright-holder><copyright-holder xml:lang="ru">Щепкин Д.В., Матюшенко A.M., Копылова Г.В., Артемова Н.В., Бершицкий С.Ю., Цатурян A.K., Левицкий Д.И.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://actanaturae.ru/2075-8251/article/view/10597">https://actanaturae.ru/2075-8251/article/view/10597</self-uri><abstract xml:lang="en"><p>We show that the mutations D137L and G126R, which stabilize the central part of the tropomyosin (Tm) molecule, increase both the maximal sliding velocity of the regulated actin filaments in the in vitro motility assay at high Са 2+ concentrations and the Са 2+-sensitivity of the actin-myosin interaction underlying this sliding. Based on an analysis of the recently published data on the structure of the actin-Tm–myosin complex, we suppose that the physiological effects of these mutations in Tm can be accounted for by their influence on the interactions between the central part of Tm and certain sites of the myosin head.</p></abstract><trans-abstract xml:lang="ru"><p>Показано, что мутации D137L и G126R, стабилизирующие центральную часть молекулы тропомиозина (ТМ), увеличивают максимальную скорость скольжения регулируемых актиновых филаментов в искусственной подвижной системе при высоких концентрациях Са 2+ и повышают Са 2+ -чувствительность актин-миозинового взаимодействия, обеспечивающего такое скольжение. На основе анализа опубликованных данных о структуре комплекса актин-ТМ-миозин высказано предположение, что физиологические эффекты этих мутаций в ТМ могут быть обусловлены влиянием на взаимодействия между центральной частью ТМ и определенными участками головки миозина.</p></trans-abstract><kwd-group xml:lang="en"><kwd>actin-myosin interaction</kwd><kwd>in vitro motility assay</kwd><kwd>regulation of muscle contraction</kwd><kwd>tropomyosin</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>актин</kwd><kwd>искусственная подвижная система</kwd><kwd>миозин</kwd><kwd>регуляция мышечного сокращения</kwd><kwd>тропомиозин</kwd></kwd-group><funding-group><funding-statement xml:lang="en">This work was supported by the RFBR (grants No. 12-04-00411-a, 11-04-00750-a, 11-04-00908-a and 12-04-31328-mol-a, 13-04-40099, 13-04- 40100, 13-04-40101) and the Molecular and Cellular Biology Program of the Presidium of the Russian Academy of Sciences.</funding-statement><funding-statement xml:lang="ru">Работа поддержана РФФИ (гранты № 12-04-00411-а, 11-04-00750-а, 11-04-00908-а и 12-04-31328-мол-а, 13-04-40099, 13-04-40100, 13-04-40101) и Программой «Молекулярная и клеточная биология» Президиума РАН.</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>[1] McKillop D.F.A., Geeves M.A. // Biophys. 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