Abstract
Microtubules are dynamic polymers that move stochastically between periods of growth and shrinkage, a property known as dynamic instability. Here, to investigate the mechanisms regulating microtubule dynamics in Xenopus egg extracts, we have cloned the complementary DNA encoding the microtubule-associated protein XMAP215 and investigated the function of the XMAP215 protein. Immunodepletion of XMAP215 indicated that it is a major microtubule-stabilizing factor in Xenopus egg extracts. During interphase, XMAP215 stabilizes microtubules primarily by opposing the activity of the destabilizing factor XKCM1, a member of the kinesin superfamily. These results indicate that microtubule dynamics in Xenopus egg extracts are regulated by a balance between a stabilizing factor, XMAP215, and a destabilizing factor, XKCM1.
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Acknowledgements
We thank F. Senger for cell culture; D. Drechsel for help during protein purification; A. Shevchenko and A. Shevchenko for mass spectrometry analysis; A. Desai for stimulating discussions and advice; and A. Desai, I. Sassoon, P. Gönczy, K. Oegema, M. Rathman, M. Mavris and C. Gonzalez for critical reading of the manuscript. A.P. was supported by an EMBO long-term and an HSFPO long-term fellowship. K.K. was supported by an HFSPO long-term fellowship.
Correspondence and requests for materials should be addressed to A.A.H. The XMAP215 cDNA sequence has been submitted to EMBL Nucleotide Sequence Database under accession number AJ251130.
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Tournebize, R., Popov, A., Kinoshita, K. et al. Control of microtubule dynamics by the antagonistic activities of XMAP215 and XKCM1 in Xenopus egg extracts. Nat Cell Biol 2, 13–19 (2000). https://doi.org/10.1038/71330
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DOI: https://doi.org/10.1038/71330
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