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Essential 'ankle' in the myosin lever arm

机译:肌球蛋白杠杆臂中的基本“脚踝”

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摘要

Cellular motors are fascinating machines that function by undergoing successive conforma-tional changes that require joints in their structure. Where these are located is particularly critical for molecular motors that produce force with relatively rigid lever arms, such as myosins (1). A long-standing paradox in myosin function may finally be understood from structural insights provided by Cohen and colleagues in PNAS (2). Although highly flexible joints are necessary to turn off their activity, these molecular motors have evolved to control such compliance in active heads to produce force under various strain. The structure of the light chain-binding domain (LCD) of scallop catch muscle myosin Ⅱ (2) describes a unique hinge in this lever arm that could be essential for the regulation of the motor and might also help explain how strain can promote the attachment of the second head of the myosin molecule to the actin filament in isometric contraction (3) and the efficient increase of the resistance of active muscle to stretch (4).
机译:蜂窝电动机是一种引人入胜的机器,通过进行连续的构形变化(这些结构需要在其结构中接合)来发挥作用。这些位置对于使用相对刚性的杠杆臂(例如肌球蛋白(1))产生力的分子电动机而言尤其重要。 Cohen及其同事在PNAS中提供的结构见解最终可以理解肌球蛋白功能的长期矛盾(2)。尽管必须使用高度柔性的接头来关闭其活动,但这些分子马达已经发展为控制主动头中的这种顺应性,以在各种应变下产生力。扇贝抓肌肌球蛋白Ⅱ的轻链结合域(LCD)的结构描述了此杠杆臂中的独特铰链,这对于调节马达至关重要,也可能有助于解释应变如何促进附着力肌球蛋白分子第二个头部在等距收缩中对肌动蛋白丝的收缩(3)和有效肌肉对拉伸的抵抗力的有效增加(4)。

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    Structural Motility, Institut Curie, Centre National de la Recherche Scientifique, Unite Mixte de Recherche 144, 75248 Paris Cedex 05, France;

    Structural Motility, Institut Curie, Centre National de la Recherche Scientifique, Unite Mixte de Recherche 144, 75248 Paris Cedex 05, France;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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