We measured the force-velocity curves of single kinesin molecules attached to silica beads moving in an in vitro motility assay. Optical trapping interferometry was used to track movement with subnanometer precision and to apply calibrated, pN-sized forces to the beads. Velocity decreased linearly with increasing force, and kinesin molecules moved against applied loads of up to 56 pN. Comparison of force-velocity curves at limiting and saturating ATP concentrations suggests that the load-dependent diminution in kinesin velocity may be due to a decrease in the net displacement per molecule of ATP hydrolyzed, not simply to a slowing of the ATP turnover rate; kinesin would therefore appear to be a loosely coupled motor.
Description
Cell - Force and velocity measured for single kinesin molecules
%0 Journal Article
%1 kinesin
%A Svoboda, K
%A Block, S M
%D 1994
%I Cell Press
%J Cell
%K phage
%N 5
%P 773--784
%T Force and velocity measured for single kinesin molecules
%U http://linkinghub.elsevier.com/retrieve/pii/0092867494900604
%V 77
%X We measured the force-velocity curves of single kinesin molecules attached to silica beads moving in an in vitro motility assay. Optical trapping interferometry was used to track movement with subnanometer precision and to apply calibrated, pN-sized forces to the beads. Velocity decreased linearly with increasing force, and kinesin molecules moved against applied loads of up to 56 pN. Comparison of force-velocity curves at limiting and saturating ATP concentrations suggests that the load-dependent diminution in kinesin velocity may be due to a decrease in the net displacement per molecule of ATP hydrolyzed, not simply to a slowing of the ATP turnover rate; kinesin would therefore appear to be a loosely coupled motor.
@article{kinesin,
abstract = {We measured the force-velocity curves of single kinesin molecules attached to silica beads moving in an in vitro motility assay. Optical trapping interferometry was used to track movement with subnanometer precision and to apply calibrated, pN-sized forces to the beads. Velocity decreased linearly with increasing force, and kinesin molecules moved against applied loads of up to 56 pN. Comparison of force-velocity curves at limiting and saturating ATP concentrations suggests that the load-dependent diminution in kinesin velocity may be due to a decrease in the net displacement per molecule of ATP hydrolyzed, not simply to a slowing of the ATP turnover rate; kinesin would therefore appear to be a loosely coupled motor.},
added-at = {2014-02-23T12:04:53.000+0100},
author = {Svoboda, K and Block, S M},
biburl = {https://www.bibsonomy.org/bibtex/282426d0c9096ff7b5445f3bd7ac1b571/ross_mck},
description = {Cell - Force and velocity measured for single kinesin molecules},
interhash = {894e91d1dc3b20f2b2463dffb56e2d12},
intrahash = {82426d0c9096ff7b5445f3bd7ac1b571},
issn = {00928674},
journal = {Cell},
keywords = {phage},
month = jun,
number = 5,
pages = {773--784},
publisher = {Cell Press},
refid = {0092-8674(94)90060-4 DOI -},
timestamp = {2014-02-23T12:11:28.000+0100},
title = {Force and velocity measured for single kinesin molecules},
url = {http://linkinghub.elsevier.com/retrieve/pii/0092867494900604},
volume = 77,
year = 1994
}