Mechanochemical tuning of a kinesin motor essential for malaria parasite transmission

Mechanochemical tuning of a kinesin motor essential for malaria parasite transmission
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疟疾寄生虫传播所必需的驱动蛋白马达的机械化学调节

DOI:
10.1101/2022.02.11.480087
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发表时间:
2022
期刊:
--
影响因子:
--
通讯作者:
Liu T
Liu T
中科院分区:
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文献类型:
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作者:
Liu T

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疟原虫引起疟疾,每年杀死数十万人。基于微管的运动驱动蛋白-8B是疟原虫雄配子发育所必需的,它的缺失完全阻断了疟原虫的传播。为了理解驱动蛋白-8B的基本作用的分子基础,我们表征了来自P.伯格海和P.恶性疟原虫。这两种马达驱动ATP依赖性微管滑动,但也催化ATP依赖性微管解聚。我们使用冷冻电子显微镜确定了这些马达的微管结合结构,显示了非常相似的微管相互作用模式,其中微管-驱动蛋白界面处的疟原虫不同序列影响马达功能。然而,有趣的是,伯氏毕赤酵母激酶-8B对ATP类似物结合表现出非典型的结构响应,使得不诱导颈接头对接。然而,颈连接区是这些马达的运动性和解聚活性所必需的。这些数据表明,机械化学ofPlasmodiumkinesin-8Bs的功能调整,以支持鞭毛的形成。
Plasmodiumspecies cause malaria and kill hundreds of thousands annually. The microtubule-based motor kinesin-8B is required for development of the flagellatedPlasmodiummale gamete, and its absence completely blocks parasite transmission. To understand the molecular basis of kinesin-8B’s essential role, we characterised the in vitro properties of kinesin-8B motor domains fromP. bergheiandP. falciparum. Both motors drive ATP-dependent microtubule gliding, but also catalyse ATP-dependent microtubule depolymerisation. We determined these motors’ microtubule-bound structures using cryo-electron microscopy, which showed very similar modes of microtubule interaction in whichPlasmodium-distinct sequences at the microtubule-kinesin interface influence motor function. Intriguingly however,P. bergheikinesin-8B exhibits a non-canonical structural response to ATP analogue binding such that neck linker docking is not induced. Nevertheless, the neck linker region is required for motility and depolymerisation activities of these motors. These data suggest that the mechanochemistry ofPlasmodiumkinesin-8Bs is functionally tuned to support flagella formation.
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