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100 1 _ |a Risi, Cristina
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245 _ _ |a N-Terminal Domains of Cardiac Myosin Binding Protein C Cooperatively Activate the Thin Filament
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520 _ _ |a Muscle contraction relies on interaction betweenmyosin-based thick filaments and actin-based thinfilaments. Myosin binding protein C (MyBP-C) is akey regulator of actomyosin interactions. Recentstudies established that the N0-terminal domains(NTDs) of MyBP-C can either activate or inhibit thinfilaments, but the mechanism of their collectiveaction is poorly understood. Cardiac MyBP-C(cMyBP-C) harbors an extra NTD, which is absentin skeletal isoforms of MyBP-C, and its role in regulationof cardiac contraction is unknown. Here weshow that the first two domains of human cMyPB-C(i.e., C0 and C1) cooperate to activate the thin filament.We demonstrate that C1 interacts with tropomyosinvia a positively charged loop and that thisinteraction, stabilized by the C0 domain, is requiredfor thin filament activation by cMyBP-C. Our datareveal a mechanism by which cMyBP-C can modulatecardiac contraction and demonstrate a function of the C0 domain.
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700 1 _ |a Belknap, Betty
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700 1 _ |a Forgacs-Lonart, Eva
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700 1 _ |a Harris, Samantha P.
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700 1 _ |a Schröder, Gunnar
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700 1 _ |a White, Howard D.
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700 1 _ |a Galkin, Vitold E.
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