Kinetic Adaptations of Myosins for Their Diverse Cellular Functions.

Kinetic Adaptations of Myosins for Their Diverse Cellular Functions.
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DOI:
10.1111/tra.12388
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发表时间:
2016-08
期刊:
Traffic (Copenhagen, Denmark)
影响因子:
--
通讯作者:
Sellers JR
Sellers JR
中科院分区:
其他
文献类型:
--
作者:
Heissler SM;Sellers JR

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肌球蛋白超家族成员参与真核生物生命的各个方面。它们的功能从细胞器和货物的运输到膜张力的产生以及肌肉的收缩不等。鉴于所有具有酶活性的肌球蛋白都遵循一个保守的机械酶循环,在这个循环中,ATP水解为ADP和无机磷酸与基于肌动蛋白的运输或将肌动蛋白束缚到特定的细胞区室相偶联,其生理功能的多样性是显著的。肌球蛋白的动力学能力和局限性由肌动蛋白加速ATP水解以及水解产物释放的程度决定,并且与其生理任务不可分割地联系在一起。这篇综述聚焦于动力学能力,这些能力与结构适应性一起,造就了具有针对其多样细胞功能的独特机械酶特性的肌球蛋白。
Members of the myosin superfamily are involved in all aspects of eukaryotic life. Their function ranges from the transport of organelles and cargos to the generation of membrane tension, and the contraction of muscle. The diversity of physiological functions is remarkable, given that all enzymatically active myosins follow a conserved mechanoenzymatic cycle in which the hydrolysis of ATP to ADP and inorganic phosphate is coupled to either actin-based transport or tethering of actin to defined cellular compartments. Kinetic capacities and limitations of a myosin are determined by the extent to with actin can accelerate the hydrolysis of ATP and the release of the hydrolysis products and are indispensably linked to its physiological tasks. This review focuses on kinetic competencies that – together with structural adaptations – result in myosins with unique mechanoenzymatic properties targeted to their diverse cellular function.
肌球蛋白18A与非肌肉肌球蛋白2结合形成混合的双极丝。
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