7NB8
Plasmodium falciparum kinesin-5 motor domain without nucleotide, complexed with 14 protofilament microtubule.
Summary for 7NB8
| Entry DOI | 10.2210/pdb7nb8/pdb |
| EMDB information | 12257 |
| Descriptor | Tubulin alpha-1B chain, Tubulin beta chain, Kinesin-5, ... (6 entities in total) |
| Functional Keywords | cytoskeleton, motor protein, mitosis |
| Biological source | Plasmodium falciparum (isolate 3D7) More |
| Total number of polymer chains | 3 |
| Total formula weight | 148115.33 |
| Authors | Cook, A.D.,Roberts, A.,Atherton, J.,Tewari, R.,Topf, M.,Moores, C.A. (deposition date: 2021-01-25, release date: 2021-10-13, Last modification date: 2024-07-10) |
| Primary citation | Cook, A.D.,Roberts, A.J.,Atherton, J.,Tewari, R.,Topf, M.,Moores, C.A. Cryo-EM structure of a microtubule-bound parasite kinesin motor and implications for its mechanism and inhibition. J.Biol.Chem., 297:101063-101063, 2021 Cited by PubMed Abstract: 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. PubMed: 34375637DOI: 10.1016/j.jbc.2021.101063 PDB entries with the same primary citation |
| Experimental method | ELECTRON MICROSCOPY (4.4 Å) |
Structure validation
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