Download MendeleyThe kinesin-5 tail and bipolar miniflament domains are the origin of its microtubule crosslinking and sliding activity.
Nithianantham, S., Iwanski, M.K., Gaska, I., Pandey, H., Bodrug, T., Inagaki, S., Major, J., Brouhard, G.J., Gheber, L., Rosenfeld, S.S., Forth, S., Hendricks, A.G., Al-Bassam, J.(2023) Mol Biol Cell : mbcE23070287-mbcE23070287
- PubMed: 37610838
- DOI: https://doi.org/10.1091/mbc.E23-07-0287
- Primary Citation of Related Structures:
7S5U - PubMed Abstract:
Kinesin-5 crosslinks and slides apart microtubules to assemble, elongate, and maintain the mitotic spindle. Kinesin-5 is a tetramer, where two N-terminal motor domains are positioned at each end of the motor, and the coiled-coil stalk domains are organized into a tetrameric bundle through the bipolar assembly (BASS) domain. To dissect the function of the individual structural elements of the motor, we constructed a minimal kinesin-5 tetramer (mini-tetramer). We determined the x-ray structure of the extended, 34-nm BASS domain. Guided by these structural studies, we generated active bipolar kinesin-5 mini-tetramer motors from Drosophila melanogastor and human orthologues which are half the length of native kinesin-5. We then used these kinesin-5 mini-tetramers to examine the role of two unique structural adaptations of kinesin-5: 1) the length and flexibility of the tetramer, and 2) the C-terminal tails which interact with the motor domains to coordinate their ATPase activity. The C-terminal domain causes frequent pausing and clustering of kinesin-5. By comparing microtubule crosslinking and sliding by mini-tetramer and full-length kinesin-5, we find that both the length and flexibility of kinesin-5 and the C-terminal tails govern its ability to crosslink microtubules. Once crosslinked, stiffer mini-tetramers slide antiparallel microtubules more efficiently than full-length motors.
Organizational Affiliation:
Department of Molecular and Cellular Biology, University of California, Davis, CA 95616.
