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• W1776013553 abstract "beta-Tubulin synthesis in eucaryotic cells is subject to control by an autoregulatory posttranscriptional mechanism in which the first four amino acids of the beta-tubulin polypeptide act either directly or indirectly to control the stability of beta-tubulin mRNA. To investigate the contribution of this amino-terminal domain to microtubule assembly and dynamics, we introduced a series of deletions encompassing amino acids 2 to 5 of a single mammalian beta-tubulin isotype, M beta 1. Constructs carrying such deletions were inserted into an expression vector, and the ability of the altered polypeptide to coassemble into microtubules was tested by using an anti-M beta 1-specific antibody. We show that the M beta 1 beta-tubulin polypeptide was competent for coassembly into microtubules in transient transfection experiments and in stably transfected cell lines when it lacked either amino acid 2 or amino acids 2 and 3. The capacity of these mutant beta-tubulins to coassemble into polymerized microtubules was only slightly diminished relative to that of unaltered beta-tubulin, and their expression did not influence the viability or growth properties of cell lines carrying these deletions. However, more extensive amino-terminal deletions either severely compromised or abolished the capacity for coassembly. In analogous experiments in which alterations were introduced into the amino-terminal domain of a mammalian alpha-tubulin isotype, M alpha 4, deletion of amino acid 2 did not affect the ability of the altered polypeptide to coassemble, although removal of additional amino-terminal residues essentially abolished the capacity for competent coassembly. The stability of the altered assembly-competent alpha- and beta-tubulin polypeptides was measured in pulse-chase experiments and found to be indistinguishable from the stability of the corresponding unaltered polypeptides. An assembly-competent M alpha 4 polypeptide carrying a deletion encompassing the 12 carboxy-terminal amino acids also had a half-life indistinguishable from that of the wild-type alpha-tubulin molecule. These data suggest that the universally conserved amino terminus of beta-tubulin acts largely in a regulatory role and that the carboxy-terminal domain of alpha-tubulin is not essential for coassembly in mammalian cells in vivo." @default.
• W1776013553 created "2016-06-24" @default.
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• W1776013553 date "1989-08-01" @default.
• W1776013553 modified "2023-10-17" @default.
• W1776013553 title "Assembly Properties of Altered β-Tubulin Polypeptides Containing Disrupted Autoregulatory Domains" @default.
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• W1776013553 doi "https://doi.org/10.1128/mcb.9.8.3418-3428.1989" @default.
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