Biotechnology and Biological Sciences Research Council (BBSRC)
BB/L014211/1
英国
引用
ジャーナル: J Biol Chem / 年: 2021 タイトル: Cryo-EM structure of a microtubule-bound parasite kinesin motor and implications for its mechanism and inhibition. 著者: Alexander D Cook / Anthony J Roberts / Joseph Atherton / Rita Tewari / Maya Topf / Carolyn A Moores / 要旨: 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 ...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.
Asymmetric (C1) reconstruction of Plasmodium falciparum kinesin-5 motor domain without nucleotide, in complex with porcine 14 protofilament microtubules.
Symmetry expanded reconstruction of Plasmodium falciparum kinesin-5 motor without nucleotide, in complex with porcine 14 protofilament microtubules. After motor domain 3D classification.
凍結剤: ETHANE / チャンバー内湿度: 95 % / チャンバー内温度: 296 K / 装置: FEI VITROBOT MARK IV 詳細: 3.5 uM microtubules were incubated to the grid and incubated for 30 seconds. The grid was blotted, then 40 uM kinesin motor domain added and incubated for 30 seconds. The grid was again ...詳細: 3.5 uM microtubules were incubated to the grid and incubated for 30 seconds. The grid was blotted, then 40 uM kinesin motor domain added and incubated for 30 seconds. The grid was again blotted and 40 uM kinesin motor domain added for 30 seconds. Then the grid was blotted and plunge frozen..
詳細: 3JAT was pseudosymmetrised in into different microtubule protofilament numbers using EMDB entries 5191-6. Kinesin decorated references were created using 3JAT and 3HQD.