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
Single alpha-helices involved in coiled-coils or other helix-helix interfaces - #340 / 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 ...Single alpha-helices involved in coiled-coils or other helix-helix interfaces - #340 / 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 / Single alpha-helices involved in coiled-coils or other helix-helix interfaces / Up-down Bundle / P-loop containing nucleoside triphosphate hydrolase / Mainly Alpha 類似検索 - ドメイン・相同性
ジャーナル: Proc Natl Acad Sci U S A / 年: 2006 タイトル: Crystal structures of human cardiac beta-myosin II S2-Delta provide insight into the functional role of the S2 subfragment. 著者: Wulf Blankenfeldt / Nicolas H Thomä / John S Wray / Mathias Gautel / Ilme Schlichting / 要旨: Myosin II is the major component of the muscle thick filament. It consists of two N-terminal S1 subfragments ("heads") connected to a long dimeric coiled-coil rod. The rod is in itself twofold ...Myosin II is the major component of the muscle thick filament. It consists of two N-terminal S1 subfragments ("heads") connected to a long dimeric coiled-coil rod. The rod is in itself twofold symmetric, but in the filament, the two heads point away from the filament surface and are therefore not equivalent. This breaking of symmetry requires the initial section of the rod, subfragment 2 (S2), to be relatively flexible. S2 is an important functional element, involved in various mechanisms by which the activity of smooth and striated muscle is regulated. We have determined crystal structures of the 126 N-terminal residues of S2 from human cardiac beta-myosin II (S2-Delta), of both WT and the disease-associated E924K mutant. S2-Delta is a straight parallel dimeric coiled coil, but the N terminus of one chain is disordered in WT-S2-Delta due to crystal contacts, indicative of unstable local structure. Bulky noncanonical side chains pack into a/d positions of S2-Delta's N terminus, leading to defined local asymmetry and axial stagger, which could induce nonequivalence of the S1 subfragments. Additionally, S2 possesses a conserved charge distribution with three prominent rings of negative potential within S2-Delta, the first of which may provide a binding interface for the "blocked head" of smooth muscle myosin in the OFF state. The observation that many disease-associated mutations affect the second negatively charged ring further suggests that charge interactions play an important role in regulation of cardiac muscle activity through myosin-binding protein C.
#1: ジャーナル: J.Mol.Biol. / 年: 1999 タイトル: Mutations in Beta-Myosin S2 that Cause Familial Hypertrophic Cardiomyopathy (Fhc) Abolish the Interaction with the Regulatory Domain of Myosin-Binding Protein-C 著者: Gruen, M. / Gautel, M.
解像度: 2.5→20 Å / Cor.coef. Fo:Fc: 0.922 / Cor.coef. Fo:Fc free: 0.876 / SU B: 20.647 / SU ML: 0.458 / TLS residual ADP flag: LIKELY RESIDUAL / 交差検証法: THROUGHOUT / ESU R: 0.891 / ESU R Free: 0.419 / 立体化学のターゲット値: MAXIMUM LIKELIHOOD 詳細: Hydrogens have been added in the riding positions. Target sigma values for restrained B-factor refinement have been relaxed to 10 A*A to reflect the special shape of the molecule. Atoms that ...詳細: Hydrogens have been added in the riding positions. Target sigma values for restrained B-factor refinement have been relaxed to 10 A*A to reflect the special shape of the molecule. Atoms that could not be located have been assigned a temperature factor of 500 A*A and occupancy value of 0 for better discernability.
Rfactor
反射数
%反射
Selection details
Rfree
0.349
1040
5.1 %
RANDOM
Rwork
0.273
-
-
-
obs
0.277
19157
96.2 %
-
溶媒の処理
イオンプローブ半径: 0.8 Å / 減衰半径: 0.8 Å / VDWプローブ半径: 1.4 Å / 溶媒モデル: BABINET MODEL WITH MASK