Download MendeleyStructural model of microtubule dynamics inhibition by kinesin-4 from the crystal structure of KLP-12 -tubulin complex.
Taguchi, S., Nakano, J., Imasaki, T., Kita, T., Saijo-Hamano, Y., Sakai, N., Shigematsu, H., Okuma, H., Shimizu, T., Nitta, E., Kikkawa, S., Mizobuchi, S., Niwa, S., Nitta, R.(2022) Elife 11
- PubMed: 36065637
- DOI: https://doi.org/10.7554/eLife.77877
- Primary Citation of Related Structures:
7X4N - PubMed Abstract:
Kinesin superfamily proteins are microtubule-based molecular motors driven by the energy of ATP hydrolysis. Among them, the kinesin-4 family is a unique motor that inhibits microtubule dynamics. Although mutations of kinesin-4 cause several diseases, its molecular mechanism is unclear because of the difficulty of visualizing the high-resolution structure of kinesin-4 working at the microtubule plus-end. Here, we report that KLP-12, a C. elegans kinesin-4 ortholog of KIF21A and KIF21B, is essential for proper length control of C. elegans axons, and its motor domain represses microtubule polymerization in vitro. The crystal structure of the KLP-12 motor domain complexed with tubulin, which represents the high-resolution structural snapshot of the inhibition state of microtubule-end dynamics, revealed the bending effect of KLP-12 for tubulin. Comparison with the KIF5B-tubulin and KIF2C-tubulin complexes, which represent the elongation and shrinking forms of microtubule ends, respectively, showed the curvature of tubulin introduced by KLP-12 is in between them. Taken together, KLP-12 controls the proper length of axons by modulating the curvature of the microtubule ends to inhibit the microtubule dynamics.
Organizational Affiliation:
Division of Structural Medicine and Anatomy, Department of Physiology and Cell Biology, Kobe University Graduate School of Medicine, Kobe, Japan.
