Journal
STRUCTURE
Volume 22, Issue 8, Pages 1173-1183Publisher
CELL PRESS
DOI: 10.1016/j.str.2014.06.010
Keywords
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Funding
- National Sciences and Engineering Council of Canada
- Alberta Innovates Health Solutions (AIHS) through an Alberta Cancer Foundation grant
- Senior Scientist Award from AIHS
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Members of the kinesin-13 subfamily use motor domains in an unconventional fashion to initiate microtubule MT) depolymerization at MT ends, suggesting unique conformational transitions for lattice engagement, end adaptation, or both. Using hydrogen-deuterium exchange and electron microscopy, we explored conformational changes in free dimeric mitotic centromere-associated kinesin MCAK) and when bound to a depolymerization intermediate. ATP hydrolysis relaxes the conformation of the dimer, notably in the neck and N-terminal domain. Exchanging ADP in dimeric MCAK with ATP at the MT plus end induces outward curvature in alpha/beta-tubulin, accompanied by a restructuring of the MCAK neck and N terminus, as it returns to a closed state. Reestablishing a closed dimer induces lateral separation of paired tubulin dimers, which may assist in depolymerization. Thus, full-length ADP-MCAK transitions from an open diffusion-competent configuration to a closed state upon plus end-mediated nucleotide exchange, which is mediated by conformational changes in the N-terminal domains of the dimer.
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