Display Settings:

Format

Send to:

Choose Destination
Philos Trans R Soc Lond B Biol Sci. 2000 Apr 29;355(1396):449-57.

Searching for kinesin's mechanical amplifier.

Author information

  • 1Howard Hughes Medical Institute, and Department of Cellular and Molecular Pharmacology, University of California, San Francisco 94143, USA. vale@phy.ucsf.edu

Abstract

Kinesin, a microtubule-based motor, and myosin, an actin-based motor, share a similar core structure, indicating that they arose from a common ancestor. However, kinesin lacks the long lever-arm domain that is believed to drive the myosin power stroke. Here, we present evidence that a much smaller region of ca. 10-40 amino acids serves as a mechanical element for kinesin motor proteins. These 'neck regions' are class conserved and have distinct structures in plus-end and minus-end-directed kinesin motors. Mutagenesis studies also indicate that the neck regions are involved in coupling ATP hydrolysis and energy into directional motion along the microtubule. We suggest that the kinesin necks drive motion by undergoing a conformational change in which they detach and re-dock onto the catalytic core during the ATPase cycle. Thus, kinesin and myosin have evolved unique mechanical elements that amplify small, nucleotide-dependent conformational changes that occur in their similar catalytic cores.

PMID:
10836498
[PubMed - indexed for MEDLINE]
PMCID:
PMC1692751
Free PMC Article
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for HighWire Icon for PubMed Central
    Loading ...
    Write to the Help Desk