actin / tropomyosin / myosin / cardiac / CONTRACTILE PROTEIN
機能・相同性
機能・相同性情報
regulation of slow-twitch skeletal muscle fiber contraction / regulation of the force of skeletal muscle contraction / Striated Muscle Contraction / muscle myosin complex / regulation of the force of heart contraction / transition between fast and slow fiber / myosin filament / adult heart development / cardiac muscle hypertrophy in response to stress / muscle filament sliding ...regulation of slow-twitch skeletal muscle fiber contraction / regulation of the force of skeletal muscle contraction / Striated Muscle Contraction / muscle myosin complex / regulation of the force of heart contraction / transition between fast and slow fiber / myosin filament / adult heart development / cardiac muscle hypertrophy in response to stress / muscle filament sliding / myosin complex / myosin II complex / structural constituent of muscle / ventricular cardiac muscle tissue morphogenesis / microfilament motor activity / myofibril / skeletal muscle contraction / striated muscle contraction / ATP metabolic process / stress fiber / cardiac muscle contraction / muscle contraction / regulation of heart rate / sarcomere / Z disc / actin filament binding / calmodulin binding / calcium ion binding / ATP binding / cytoplasm 類似検索 - 分子機能
DNA repair protein XRCC4-like, C-terminal / Myosin tail / Myosin tail / Myosin N-terminal SH3-like domain / Myosin S1 fragment, N-terminal / Myosin, N-terminal, SH3-like / Myosin N-terminal SH3-like domain profile. / Short calmodulin-binding motif containing conserved Ile and Gln residues. / IQ motif, EF-hand binding site / Myosin head, motor domain ...DNA repair protein XRCC4-like, C-terminal / Myosin tail / Myosin tail / Myosin N-terminal SH3-like domain / Myosin S1 fragment, N-terminal / Myosin, N-terminal, SH3-like / Myosin N-terminal SH3-like domain profile. / Short calmodulin-binding motif containing conserved Ile and Gln residues. / IQ motif, EF-hand binding site / Myosin head, motor domain / Myosin head (motor domain) / Myosin motor domain profile. / Myosin. Large ATPases. / IQ motif profile. / Kinesin motor domain superfamily / : / EF-hand calcium-binding domain profile. / EF-hand domain / EF-hand domain pair / P-loop containing nucleoside triphosphate hydrolase 類似検索 - ドメイン・相同性
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)
R01HL036153
米国
引用
ジャーナル: J Gen Physiol / 年: 2023 タイトル: Conformational changes linked to ADP release from human cardiac myosin bound to actin-tropomyosin. 著者: Matthew H Doran / Michael J Rynkiewicz / David Rasicci / Skylar M L Bodt / Meaghan E Barry / Esther Bullitt / Christopher M Yengo / Jeffrey R Moore / William Lehman / 要旨: Following binding to the thin filament, β-cardiac myosin couples ATP-hydrolysis to conformational rearrangements in the myosin motor that drive myofilament sliding and cardiac ventricular ...Following binding to the thin filament, β-cardiac myosin couples ATP-hydrolysis to conformational rearrangements in the myosin motor that drive myofilament sliding and cardiac ventricular contraction. However, key features of the cardiac-specific actin-myosin interaction remain uncertain, including the structural effect of ADP release from myosin, which is rate-limiting during force generation. In fact, ADP release slows under experimental load or in the intact heart due to the afterload, thereby adjusting cardiac muscle power output to meet physiological demands. To further elucidate the structural basis of this fundamental process, we used a combination of cryo-EM reconstruction methodologies to determine structures of the human cardiac actin-myosin-tropomyosin filament complex at better than 3.4 Å-resolution in the presence and in the absence of Mg2+·ADP. Focused refinements of the myosin motor head and its essential light chains in these reconstructions reveal that small changes in the nucleotide-binding site are coupled to significant rigid body movements of the myosin converter domain and a 16-degree lever arm swing. Our structures provide a mechanistic framework to understand the effect of ADP binding and release on human cardiac β-myosin, and offer insights into the force-sensing mechanism displayed by the cardiac myosin motor.
超分子 #1: Complex of the human beta cardiac myosin II in the rigor form wit...
超分子
名称: Complex of the human beta cardiac myosin II in the rigor form with the associated essential light chain. タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: all
-
超分子 #2: Human beta-cardiac myosin II
超分子
名称: Human beta-cardiac myosin II / タイプ: complex / ID: 2 / 親要素: 1 / 含まれる分子: #1