Mechanochemical tuning of a kinesin motor essential for malaria parasite transmission.
Mechanochemical tuning of a kinesin motor essential for malaria parasite transmission.
复制标题
疟疾寄生虫传播必不可少的驱动蛋白电动机的机械化学调节。
DOI:
10.1038/s41467-022-34710-x
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发表时间:
2022-11-16
影响因子:
16.6
通讯作者:
Moores, Carolyn A.
中科院分区:
文献类型:
--
作者:
Liu, Tianyang;Shilliday, Fiona;Cook, Alexander D.;Zeeshan, Mohammad;Brady, Declan;Tewari, Rita;Sutherland, Colin J.;Roberts, Anthony J.;Moores, Carolyn A.
Plasmodium species cause malaria and kill hundreds of thousands annually. The microtubule-based motor kinesin-8B is required for development of the flagellated Plasmodium male 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 from P. berghei and P. 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 which Plasmodium-distinct sequences at the microtubule-kinesin interface influence motor function. Intriguingly however, P. berghei kinesin-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 of Plasmodium kinesin-8Bs is functionally tuned to support flagella formation. Plasmodium kinesin-8B is essential for male gamete formation and its absence blocks parasite transmission. Using cryo-EM and TIRF, the authors report how kinesin-8B motor domains are tuned to support microtubule motility and depolymerase activity.
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