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Biophys Chem. 2011 Mar;154(2-3):56-65. doi: 10.1016/j.bpc.2011.01.001. Epub 2011 Jan 13.

Two-state displacement by the kinesin-14 Ncd stalk.

Author information

1
Department of Cell Biology, Structural Biology & Biophysics Program, Duke University Medical Center, Durham, NC 27710, USA. mark.hallen@duke.edu

Abstract

The nonprocessive kinesin-14 Ncd motor binds to microtubules and hydrolyzes ATP, undergoing a single displacement before releasing the microtubule. A lever-like rotation of the coiled-coil stalk is thought to drive Ncd displacements or steps along microtubules. Crystal structures and cryoelectron microscopy reconstructions imply that stalk rotation is correlated with ADP release and microtubule binding by the motor. Here we report FRET assays showing that the end of the stalk is more than ~9nm from the microtubule when wild-type Ncd binds microtubules without added nucleotide, but the stalk is within ~6nm of the microtubule surface when the microtubule-bound motor binds an ATP analogue, matching the rotated state observed in crystal structures. We propose that the stalk rotation is initiated when the motor binds to microtubules and releases ADP, and is completed when ATP binds.

PMID:
21288629
PMCID:
PMC3080049
DOI:
10.1016/j.bpc.2011.01.001
[Indexed for MEDLINE]
Free PMC Article

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