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J Biol Chem. 2012 Jul 20;287(30):24894-904. doi: 10.1074/jbc.M112.376830. Epub 2012 May 27.

Microtubule capture by mitotic kinesin centromere protein E (CENP-E).

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1
Department of Biology and Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, New York 12180, USA.

Abstract

Centromere protein E, CENP-E, is a kinetochore-associated kinesin-7 that establishes the microtubule-chromosome linkage and transports monooriented chromosomes to the spindle equator along kinetochore fibers of already bioriented chromosomes. As a processive kinesin, CENP-E uses a hand-over-hand mechanism, yet a number of studies suggest that CENP-E exhibits mechanistic differences from other processive kinesins that may be important for its role in chromosome congression. The results reported here show that association of CENP-E with the microtubule is unusually slow at 0.08 μM(-1) s(-1) followed by slow ADP release at 0.9 s(-1). ATP binding and hydrolysis are fast with motor dissociation from the microtubule at 1.4 s(-1), suggesting that CENP-E head detachment from the microtubule, possibly controlled by phosphate release, determines the rate of stepping during a processive run because the rate of microtubule gliding corresponds to 1.4 steps/s. We hypothesize that the unusually slow CENP-E microtubule association step favors CENP-E binding of stable microtubules over dynamic ones, a mechanism that would bias CENP-E binding to kinetochore fibers.

PMID:
22637578
PMCID:
PMC3408146
DOI:
10.1074/jbc.M112.376830
[Indexed for MEDLINE]
Free PMC Article
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