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Triggering of contraction in striated muscles involves a conformational transition in the N-terminal domain of troponin C, the calcium-binding component of thin filaments. We have designed a mutant troponin C in which the key conformational transition and the calcium-regulatory activity are reversibly blocked by the formation of a disulphide bridge. Our results may be applicable to other proteins of the same family of calcium-binding proteins. 相似文献