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

Journal Article

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.

Full Text

Duke Authors

Cited Authors

  • Hallen, MA; Liang, Z-Y; Endow, SA

Published Date

  • March 2011

Published In

Volume / Issue

  • 154 / 2-3

Start / End Page

  • 56 - 65

PubMed ID

  • 21288629

Electronic International Standard Serial Number (EISSN)

  • 1873-4200

Digital Object Identifier (DOI)

  • 10.1016/j.bpc.2011.01.001

Language

  • eng

Conference Location

  • Netherlands