PMID: 2118141Sep 1, 1990Paper

Two Drosophila beta tubulin isoforms are not functionally equivalent

The Journal of Cell Biology
Henry D Hoyle, Elizabeth C Raff

Abstract

We have tested the functional capacity of different beta tubulin isoforms in vivo by expressing beta 3-tubulin either in place of or in addition to beta 2-tubulin in the male germ line of Drosophila melanogaster. The testes-specific isoform, beta 2, is conserved relative to major metazoan beta tubulins, while the developmentally regulated isoform, beta 3, is considerably divergent in sequence. beta 3-tubulin is normally expressed in discrete subsets of cells at specific times during development, but is not expressed in the male germ line. beta 2-Tubulin is normally expressed only in the postmitotic germ cells of the testis, and is required for all microtubule-based functions in these cells. The normal functions of beta 2-tubulin include assembly of meiotic spindles, axonemes, and at least two classes of cytoplasmic microtubules, including those associated with the differentiating mitochondrial derivatives. A hybrid gene was constructed in which 5' sequences from the beta 2 gene were joined to protein coding and 3' sequences of the beta 3 gene. Drosophila transformed with the hybrid gene express beta 3-tubulin in the postmitotic male germ cells. When expressed in the absence of the normal testis isoform, beta 3-tubulin supports ...Continue Reading

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Jan 1, 1997·Cell Motility and the Cytoskeleton·M C HartJ A Cooper
Mar 31, 1998·Cell Motility and the Cytoskeleton·Y BobinnecM Bornens
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