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C25, an essential RNA polymerase III subunit related to the RNA polymerase II subunit RPB7.

机译:C25,一种与RNA聚合酶II亚基RPB7相关的必需RNA聚合酶III亚基。

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We identified a partially sequenced Saccharomyces cerevisiae gene which encodes a protein related to the S. cerevisiae RNA polymerase II subunit, RPB7. Several lines of evidence suggest that this related gene, YKL1, encodes the RNA polymerase III subunit C25. C25, like RPB7, is present in submolar ratios, easily dissociates from the enzyme, is essential for cell growth and viability, but is not required in certain transcription assays in vitro. YKL1 has ABF-1 and PAC upstream sequences often present in RNA polymerase subunit genes. The sodium dodecyl sulfate-polyacrylamide gel electrophoresis mobility of the YKL1 gene product is equivalent to that of the RNA polymerase III subunit C25. Finally, a C25 conditional mutant grown at the nonpermissive temperature synthesizes tRNA at reduced rates relative to 5.8S rRNA, a hallmark of all characterized RNA polymerase III mutants.
机译:我们鉴定了部分测序的酿酒酵母基因,该基因编码与酿酒酵母RNA聚合酶II亚基RPB7相关的蛋白质。几条证据表明,这一相关基因YKL1编码RNA聚合酶III亚基C25。 C25和RPB7一样,以亚摩尔比存在,很容易从酶上解离,对于细胞生长和生存能力至关重要,但在某些体外转录试验中并不需要。 YKL1具有经常出现在RNA聚合酶亚基基因中的ABF-1和PAC上游序列。 YKL1基因产物的十二烷基硫酸钠-聚丙烯酰胺凝胶电泳迁移率等同于RNA聚合酶III亚基C25的迁移率。最后,在非容许温度下生长的C25条件突变体以相对于5.8S rRNA降低的速率合成tRNA,5.8S rRNA是所有特征RNA聚合酶III突变体的标志。

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