Troponin

Japanese: トロポニン(英語表記)troponin
Troponin
Troponin C is a protein that controls muscle contraction and consists of three components (C, T, and I). Troponin C is a calcium-binding protein (molecular weight 18,000) that binds to the actin filaments that make up muscle protein, and there are 24 troponin C molecules on one actin filament. Troponin T (molecular weight 37,000) binds to tropomyosin. Troponin I (molecular weight 24,000) inhibits the interaction between actin and myosin. When these three components bind and absorb calcium released from the endoplasmic reticulum, the actin and myosin contained in the myofibril react, causing muscle contraction, and when the endoplasmic reticulum reabsorbs calcium, the muscle becomes relaxed. It was discovered by Setsuro Ebashi in 1965.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:
筋収縮を制御する蛋白質で,3成分 (C,T,I) から成る。トロポニンCは,筋肉蛋白質を構成するアクチンフィラメントに結合しているカルシウム結合蛋白質 (分子量1万 8000) で,1本のアクチンフィラメント上に 24個が存在する。トロポニンT (分子量3万 7000) はトロポミオシンと結合している。トロポニンI (分子量2万 4000) はアクチンとミオシンの相互作用を阻害する。この3成分が結合して,小胞体の放出するカルシウムを吸収すると,筋原繊維に含まれるアクチンとミオシンが反応して筋の収縮が起り,小胞体がカルシウムを再吸収すると筋は弛緩状態になる。江橋節郎が 1965年に発見した。

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