Cryo-EM structure of a microtubule-bound parasite kinesin motor and implications for its mechanism and inhibition.

Cryo-EM structure of a microtubule-bound parasite kinesin motor and implications for its mechanism and inhibition.
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DOI:
10.1016/j.jbc.2021.101063
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发表时间:
2021-11
期刊:
The Journal of biological chemistry
影响因子:
--
通讯作者:
Moores CA
Moores CA
中科院分区:
其他
文献类型:
--
作者:
Cook AD;Roberts AJ;Atherton J;Tewari R;Topf M;Moores CA

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Plasmodium parasites cause malaria and are responsible annually for hundreds of thousands of deaths. Kinesins are a superfamily of microtubule-dependent ATPases that play important roles in the parasite replicative machinery, which is a potential target for antiparasite drugs. Kinesin-5, a molecular motor that cross-links microtubules, is an established antimitotic target in other disease contexts, but its mechanism in Plasmodium falciparum is unclear. Here, we characterized P. falciparum kinesin-5 (PfK5) using cryo-EM to determine the motor's nucleotide-dependent microtubule-bound structure and introduced 3D classification of individual motors into our microtubule image processing pipeline to maximize our structural insights. Despite sequence divergence in PfK5, the motor exhibits classical kinesin mechanochemistry, including ATP-induced subdomain rearrangement and cover neck bundle formation, consistent with its plus-ended directed motility. We also observed that an insertion in loop5 of the PfK5 motor domain creates a different environment in the well-characterized human kinesin-5 drug-binding site. Our data reveal the possibility for selective inhibition of PfK5 and can be used to inform future exploration of Plasmodium kinesins as antiparasite targets.
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