Structure of Microtubule-Trapped Human Kinesin-5 and Its Mechanism of Inhibition Revealed Using Cryoelectron Microscopy.Pena, A., Sweeney, A., Cook, A.D., Topf, M., Moores, C.A.
(2020) Structure 28: 450-457.e5
- PubMed: 32084356
- DOI: 10.1016/j.str.2020.01.013
- Primary Citation of Related Structures:
6TA4, 6TA3, 6TIW
- PubMed Abstract:
- Mechanism of microtubule-trapped human kinesin-5 inhibition revealed using cryo-EM
Pena, A.P., Sweeney, A.
() To be published --: --
Kinesin-5 motors are vital mitotic spindle components, and disruption of their function perturbs cell division. We investigated the molecular mechanism of the human kinesin-5 inhibitor GSK-1, which allosterically promotes tight microtubule binding. G ...
Kinesin-5 motors are vital mitotic spindle components, and disruption of their function perturbs cell division. We investigated the molecular mechanism of the human kinesin-5 inhibitor GSK-1, which allosterically promotes tight microtubule binding. GSK-1 inhibits monomeric human kinesin-5 ATPase and microtubule gliding activities, and promotes the motor's microtubule stabilization activity. Using cryoelectron microscopy, we determined the 3D structure of the microtubule-bound motor-GSK-1 at 3.8 Å overall resolution. The structure reveals that GSK-1 stabilizes the microtubule binding surface of the motor in an ATP-like conformation, while destabilizing regions of the motor around the empty nucleotide binding pocket. Density corresponding to GSK-1 is located between helix-α4 and helix-α6 in the motor domain at its interface with the microtubule. Using a combination of difference mapping and protein-ligand docking, we characterized the kinesin-5-GSK-1 interaction and further validated this binding site using mutagenesis. This work opens up new avenues of investigation of kinesin inhibition and spindle perturbation.
Institute of Structural and Molecular Biology, Birkbeck College, London WC1E 7HX, UK. Electronic address: email@example.com.