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Tubulin isotypes and their interaction with microtubule associated proteins

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Summary

To assay the functional significance of the multiple but closely related α- and β-tubulin polypeptides (termed isotypes) that are expressed in mammalian cells, we have generated a number of sera that uniquely discriminate among these isotypes. These sera have been used to demonstrate that there is no subcellular sorting of either α- or β-tubulin isotypes among microtubules of diverse function, either in cells growing in culture or in tissues consisting of cell types that contain specialized kinds of microtubule. In spite of this failure to segregate between functionally distinct kinds of microtubule, the fact that isotype-specific amino acid sequences have been strictly conserved over extensive periods of evolutionary time argues persuasively for a functional role for the different tubulin gene products. One possibility is that they are required for specific interactions with microtubule associated proteins (MAPs), and that tubulin isotypes have coevolved with different cell type-specific MAPs with which they must interact. We have tested this hypothesis by examining the distribution of β-tubulin isotypes in mammalian cerebellum in relationship to the known patterns of expression of a number of MAPs, and find that these patterns correlate in the case of Mβ 2 and MAP 3, and Mβ 6 and MAP 1 a. These data, plus emerging data based on a structural analysis of tau, MAP 1 b and MAP 2 obtained via sequence determination of cloned cDNAs, are discussed in terms of the possible functional significance of tubulin isotype/MAP interactionsin vivo.

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Authors and Affiliations

  1. Department of Biochemistry, NYU Medical Center, New York

    N. J. Cowan, Sally A. Lewis & Wei Gu

  2. Department of Physiology, University of Liverpool, Liverpool

    R. D. Burgoyne

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  1. N. J. Cowan
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  2. Sally A. Lewis
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  3. Wei Gu
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  4. R. D. Burgoyne
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Cowan, N.J., Lewis, S.A., Gu, W. et al. Tubulin isotypes and their interaction with microtubule associated proteins. Protoplasma 145, 106–111 (1988). https://doi.org/10.1007/BF01349346

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