Abstract
KINESIN, a two-headed motor enzyme molecule, hydrolyses ATP to direct organelle transport along microtubules. As it moves along a microtubule, kinesin remains associated with, or 'tracks', micro-tubule protofilaments1,2. We have prepared truncated kinesin derivatives that contain either two mechanochemical head domains3 or only a single head. Unlike intact kinesin and the two-headed derivatives, the one-headed enzyme frequently fails to track protofilaments, suggesting that it detaches from microtubules during movement. In this way, the one-headed kinesin derivative is similar to the motor enzyme myosin, which frequently detaches from the actin filament during movement4. For myosin (which has two heads), the consequence of this detachment is that single molecules do not appear to drive continuous movement along the filament5. Our observations suggest that the ability of single two-headed kinesin molecules to drive continuous movement6,7 results from a 'hand-over-hand' mechanism6–8 in which one head remains bound to the microtubule while the other detaches and moves forwards.
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Berliner, E., Young, E., Anderson, K. et al. Failure of a single-headed kinesin to track parallel to microtubule protofilaments. Nature 373, 718–721 (1995). https://doi.org/10.1038/373718a0
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DOI: https://doi.org/10.1038/373718a0
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