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The ATPase cycle of the mitotic motor CENP-E.

ABSTRACT: We have previously shown that the mitotic motor centrosome protein E (CENP-E) is capable of walking for more than 250 steps on its microtubule track without dissociating. We have examined the kinetics of this molecular motor to see if its enzymology explains this remarkable degree of processivity. We find that like the highly processive transport motor kinesin 1, the enzymatic cycle of CENP-E is characterized by rapid ATP binding, multiple enzymatic turnovers per diffusive encounter, and gating of nucleotide binding. These features endow CENP-E with a high duty cycle, a prerequisite for processivity. However, unlike kinesin 1, neck linker docking in CENP-E is slow, occurring at a rate closer to that for Eg5, a mitotic kinesin that takes only 5-10 steps per processive run. These results suggest that like kinesin 1, features outside of the catalytic domain of CENP-E may also play a role in regulating the processive behavior of this motor.

SUBMITTER: Rosenfeld SS

PROVIDER: S-EPMC2781702 | biostudies-literature | 2009 Nov

REPOSITORIES: biostudies-literature

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The ATPase cycle of the mitotic motor CENP-E.

Rosenfeld Steven S SS van Duffelen Marilyn M Behnke-Parks William M WM Beadle Christopher C Corrreia John J Xing Jun J

The Journal of biological chemistry 20090916 47

We have previously shown that the mitotic motor centrosome protein E (CENP-E) is capable of walking for more than 250 steps on its microtubule track without dissociating. We have examined the kinetics of this molecular motor to see if its enzymology explains this remarkable degree of processivity. We find that like the highly processive transport motor kinesin 1, the enzymatic cycle of CENP-E is characterized by rapid ATP binding, multiple enzymatic turnovers per diffusive encounter, and gating ...[more]

PMID: 19759394

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