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Nucleotide-dependent angular change in kinesin motor domain bound to tubulin

Nature volume 376, pages 277–279 (1995)Cite this article

Abstract

KINESIN is a 'motor' molecule, consisting of two head domains, an α-helical coiled coil rod, and a tail part that binds to its cargo]. When expressed in a bacterial system, the head domain is functional3, and can bind to microtubules with the stoichiometry of one head per tubulin dimer. Kinesin moves along microtubules by means of a cyclic process of nucleotide binding, hydrolysis and product release4,5. We have used negative-stain electron microscopy and image analysis to study the structures of microtubules and tubulin sheets decorated with the motor domain (head) of kinesin in three states: in the presence of an unhydrolysable ATP analogue, 5″-adenylylimidodiphosphate (AMP-PNP); without nucleotides; and with adenosine 5″-diphosphate (ADP). A single kinesin head bound to a microtubule has a pear-shaped structure, with the broader end towards the 'plus' end of the microtubule under all conditions; the reverse motor, ncd, is similarly oriented. Three-dimensional maps reveal that kinesin heads have a spike that is assumed to form the attachment to the tail of a complete kinesin molecule. This spike is perpendicular to the microtubule axis in the presence of ADP, but points towards the plus end (~45á°) in the presence of AMP-PNP or absence of nucleotides. Our results provide direct evidence for a conformational change of the kinesin motor domain during the ATPase cycle.

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Authors and Affiliations

  1. MRC Laboratory of Molecular Biology, Hills Road, Cambridge, CB2 2QH, UK

    Keiko Hirose & Linda A. Amos

  2. Marie Curie Institute, The Chart, Oxted, Surrey, RH8 OTL, UK

    Andrew Lockhart & Robert A. Cross

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  1. Keiko Hirose
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  3. Robert A. Cross
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  4. Linda A. Amos
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Hirose, K., Lockhart, A., Cross, R. et al. Nucleotide-dependent angular change in kinesin motor domain bound to tubulin. Nature 376, 277–279 (1995). https://doi.org/10.1038/376277a0

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