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Two functional alpha-tubulin genes of the yeast Saccharomyces cerevisiae encode divergent proteins.

机译:酵母酿酒酵母的两个功能性α-微管蛋白基因编码不同的蛋白质。

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Two alpha-tubulin genes from the budding yeast Saccharomyces cerevisiae were identified and cloned by cross-species DNA homology. Nucleotide sequencing studies revealed that the two genes, named TUB1 and TUB3, encoded gene products of 447 and 445 amino acids, respectively, that are highly homologous to alpha-tubulins from other species. Comparison of the sequences of the two genes revealed a 19% divergence between the nucleotide sequences and a 10% divergence between the amino acid sequences. Each gene had a single intervening sequence, located at an identical position in codon 9. Cell fractionation studies showed that both gene products were present in yeast microtubules. These two genes, along with the TUB2 beta-tubulin gene, probably encode the entire complement of tubulin in budding yeast cells.
机译:通过种间DNA同源性鉴定并克隆了来自萌芽的酿酒酵母中的两个α-微管蛋白基因。核苷酸测序研究表明,两个基因分别命名为TUB1和TUB3,分别编码447和445个氨基酸的基因产物,与其他物种的α-微管蛋白高度同源。比较两个基因的序列,发现核苷酸序列之间有19%的差异,氨基酸序列之间有10%的差异。每个基因都有一个插入序列,位于密码子9的相同位置。细胞分级研究表明,两种基因产物都存在于酵母微管中。这两个基因与TUB2β-微管蛋白基因一起,可能编码出芽酵母细胞中微管蛋白的整个补体。

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