Volume 271, Number 36, Issue of September 6, 1996 pp. 22117-22124
©1996 by The American Society for Biochemistry and Molecular Biology, Inc.

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Interaction of Kinesin Motor Domains with - and -Tubulin Subunits at a Tau-independent Binding Site
REGULATION BY POLYGLUTAMYLATION

(Received for publication, March 5, 1996, and in revised form, May 17, 1996)

From the Biochimie Cellulaire, CNRS UPR 9065 and the Université P. & M. Curie, Collège de France, 11 place Marcelin Berthelot, 75005 Paris, France

Interaction of rat kinesin and Drosophila nonclaret disjunctional motor domains with tubulin was studied by a blot overlay assay. Either plus-end or minus-end-directed motor domain binds at the same extent to both - and -tubulin subunits, suggesting that kinesin binding is an intrinsic property of each tubulin subunit and that motor directionality cannot be related to a preferential interaction with a given tubulin subunit. Binding features of dimeric versus monomeric rat kinesin heads suggest that dimerization could drive conformational changes to enhance binding to tubulin. Competition experiments have indicated that kinesin interacts with tubulin at a Tau-independent binding site. Complementary experiments have shown that kinesin does not interact with the same efficiency with the different tubulin isoforms. Masking the polyglutamyl chains with a specific monoclonal antibody leads to a complete inhibition of kinesin binding. These results are consistent with a model in which polyglutamylation of tubulin regulates kinesin binding through progressive conformational changes of the whole carboxyl-terminal domain of tubulin as a function of the polyglutamyl chain length, thus modulating the affinity of tubulin for kinesin and Tau as well. These results indicate that microtubules, through tubulin polymorphism, do have the ability to control microtubule-associated protein binding.

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