Suppression analysis reveals a functional difference between the serines in positions two and five in the consensus sequence of the C-terminal domain of yeast RNA polymerase II.

Suppression analysis reveals a functional difference between the serines in positions two and five in the consensus sequence of the C-terminal domain of yeast RNA polymerase II.
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抑制分析揭示了酵母 RNA 聚合酶 II C 端结构域共有序列中位置 2 和位置 5 的丝氨酸之间的功能差异。

DOI:
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发表时间:
1996
期刊:
影响因子:
3.3
通讯作者:
J. Corden
J. Corden
中科院分区:
生物学2区
文献类型:
--
作者:
A. Yuryev;J. Corden

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RNA聚合酶II的最大亚基含有由共有序列Tyr1Ser2Pro3Thr4Ser5Pro6Ser7的串联重复序列组成的重复C末端结构域(CTD)。在酿酒酵母CTD的位置2或5处的不可磷酸化氨基酸的取代是致命的。我们开发了一种选择系统,用于分离这种致死表型的抑制子,并克隆了一个基因,SCA1(CTD丙氨酸抑制子),它补充了致死性多取代突变的隐性抑制子。SCA1(sca1 delta::hisG)的部分缺失抑制CTD共有序列第2位的丙氨酸或谷氨酸取代,以及致死性CTD截短突变,但SCA1缺失不抑制第5位的丙氨酸或谷氨酸取代。SCA1与SRB9相同,SRB9是冷敏感性CTD截短突变的抑制因子。携带显性SRB突变的菌株具有与sca1 delta::hisG菌株相同的抑制特性。这些结果揭示了位置2和5的共识CTD七肽重复之间的功能差异。SCA1和SRB突变等位基因抑制CTD截短突变的能力表明,在位置2处的取代,而不是在位置5处,导致RNA聚合酶II功能的缺陷,类似于CTD截短所引入的缺陷。
The largest subunit of RNA polymerase II contains a repetitive C-terminal domain (CTD) consisting of tandem repeats of the consenus sequence Tyr1Ser2Pro3Thr4Ser5Pro6Ser7. Substitution of nonphosphorylatable amino acids at positions two or five of the Saccharomyces cerevisiae CTD is lethal. We developed a selection system for isolating suppressors of this lethal phenotype and cloned a gene, SCA1 (suppressor of CTD alanine), which complements recessive suppressors of lethal multiple-substitution mutations. A partial deletion of SCA1 (sca1 delta ::hisG) suppresses alanine or glutamate substitutions at position two of the consensus CTD sequence, and a lethal CTD truncation mutation, but SCA1 deletion does not suppress alanine or glutamate substitutions at position five. SCA1 is identical to SRB9, a suppressor of a cold-sensitive CTD truncation mutation. Strains carrying dominant SRB mutations have the same suppression properties as a sca1 delta ::hisG strain. These results reveal a functional difference between positions two and five of the consensus CTD heptapeptide repeat. The ability of SCA1 and SRB mutant alleles to suppress CTD truncation mutations suggest that substitutions at position two, but not at position five, cause a defect in RNA polymerase II function similar to that introduced by CTD truncation.
来自构巢曲霉的蛋白激酶,可磷酸化 RNA 聚合酶 II 最大亚基的羧基末端结构域。
DOI: --
发表时间: 1992
期刊: The Journal of biological chemistry
影响因子: --
作者:
Stone,N;Reinberg,D
通讯作者: Reinberg,D
哺乳动物细胞中信使 RNA 的合成由磷酸化形式的 RNA 聚合酶 II 催化。
DOI: --
发表时间: 1987
期刊: The Journal of biological chemistry
影响因子: --
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Cadena,DL;Dahmus,ME
通讯作者: Dahmus,ME
DOI: --
发表时间: 1989-12
期刊: Genetics
影响因子: 3.3
作者:
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通讯作者: M. Nonet;R. Young
DOI: 10.1073/pnas.92.24.10864
发表时间: 1995-11-21
影响因子: 11.1
作者:
LI, Y;BJORKLUND, S;KORNBERG, RD
通讯作者: KORNBERG, RD
DOI: 10.1073/pnas.82.23.7934
发表时间: 1985-01-01
影响因子: 11.1
作者:
CORDEN, JL;CADENA, DL;DAHMUS, ME
通讯作者: DAHMUS, ME