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.
复制标题
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。
作者:
A. Yuryev;J. Corden
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.
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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
DOI:
--
发表时间:
1987
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Cadena,DL;Dahmus,ME
通讯作者:
Dahmus,ME
影响因子:
3.3
作者:
M. Nonet;R. Young
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