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Holding the reins on Myosin V

机译:握住Myosin V的re绳

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摘要

Myosins comprise a diverse family of molecular motor enzymes that use the energy from cycles of ATP binding, hydrolysis, and product release to perform mechanical work along actin filaments. Although all characterized myosins share a conserved catalytic motor domain, referred to as "head," variations in enzymatic and structural properties allow different myosins to generate diverse types of motility. Muscle myosin is not processive; it tugs intermittently on actin filaments and remains dissociated much of the time so multiple myosins are needed to sustain constant movement. In contrast, myosin V is processive, and an individual two-headed motor molecule takes multiple ≈ 36-nm steps, each coupled to the consumption of a single ATP molecule, and walks unidirectionally along an actin filament for long distances without detaching.
机译:肌球蛋白包含多种分子运动酶家族,它们利用ATP结合,水解和产物释放等循环过程中产生的能量沿肌动蛋白丝进行机械加工。尽管所有特征化的肌球蛋白共享一个保守的催化运动域,称为“头部”,但酶和结构特性的变化允许不同的肌球蛋白产生不同类型的运动。肌肉肌球蛋白不进行。它间歇性地拖曳在肌动蛋白丝上,并在许多时间保持解离,因此需要多种肌球蛋白来维持恒定的运动。相比之下,肌球蛋白V具有持续性,单个的双头运动分子采取多个≈36 nm的步长,每个步长都与单个ATP分子的消耗有关,并且沿着肌动蛋白丝单向行走很长的距离而不会脱离。

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