Mavacamten / Inhibitor / Primed myosin / MOTOR 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 / 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 ...regulation of slow-twitch skeletal muscle fiber contraction / regulation of the force of skeletal 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 / 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 / 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 / P-loop containing nucleoside triphosphate hydrolase 類似検索 - ドメイン・相同性
ジャーナル: bioRxiv / 年: 2025 タイトル: Mavacamten inhibits myosin activity by stabilising the myosin interacting-heads motif and stalling motor force generation. 著者: Sean N McMillan / Jaime R T Pitts / Bipasha Barua / Donald A Winkelmann / Charlotte A Scarff / 要旨: Most sudden cardiac deaths in young people arise from hypertrophic cardiomyopathy, a genetic disease of the heart muscle, with many causative mutations found in the molecular motor beta-cardiac ...Most sudden cardiac deaths in young people arise from hypertrophic cardiomyopathy, a genetic disease of the heart muscle, with many causative mutations found in the molecular motor beta-cardiac myosin that drives contraction. Therapeutic intervention has until recently been limited to symptomatic relief or invasive procedures. However, small molecule modulators of cardiac myosin are promising therapeutic options to target disease progression. Mavacamten is the first example to gain FDA approval but its molecular mode of action remains unclear, limiting our understanding of its functional effects in disease. To better understand this, we solved the cryoEM structures of beta-cardiac heavy meromyosin in three ADP.Pi-bound states, the primed motor domain in the presence and absence of mavacamten, and the sequestered autoinhibited interacting-heads motif (IHM) in complex with mavacamten, to 2.9 Å, 3.4 Å and 3.7 Å global resolution respectively. Together with quantitative crosslinking mass spectrometric analysis, these structures reveal how mavacamten inhibits myosin. Mavacamten stabilises ADP.Pi binding, stalling the motor domain in a primed state, reducing motor dynamics required for actin-binding cleft closure, and slowing progression through the force generation cycle. Within the two-headed myosin molecule, these effects are propagated and lead to stabilisation of the IHM, through increased contacts at the motor-motor interface. Critically, while mavacamten treatment can thus rescue cardiac muscle relaxation in diastole, it can also reduce contractile output in systole in the heart.
超分子 #1: Beta-cardiac heavy meromyosin in the primed state complexed to ma...
超分子
名称: Beta-cardiac heavy meromyosin in the primed state complexed to mavacamten タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: #1 詳細: Complex crosslinked with bis(sulfosuccinimidyl)suberate (BS3)