Serine-7 of the RNA polymerase II CTD is specifically required for snRNA gene expression.

Serine-7 of the RNA polymerase II CTD is specifically required for snRNA gene expression.
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DOI:
10.1126/science.1145989
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发表时间:
2007-12-14
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Murphy S
Murphy S
中科院分区:
其他
文献类型:
--
作者:
Egloff S;O'Reilly D;Chapman RD;Taylor A;Tanzhaus K;Pitts L;Eick D;Murphy S

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RNA聚合酶II (pol II)转录编码蛋白质和非编码小核RNA的基因。哺乳动物RNA聚合酶II (pol II)最大亚基的羧基末端结构域(CTD),包括七肽共识tyr1ser2pro3thr4ser5pro6ser7的串联重复序列,是两种基因类型表达所必需的。在这里,我们发现ser7到丙氨酸的突变导致snRNA基因表达的特定缺陷。我们还提供证据表明,ser7的磷酸化促进了与snRNA基因特异性整合子复合物的相互作用。这些发现赋予该氨基酸一种生物学功能,并强调了CTD七肽内残基的基因类型特异性要求,支持CTD编码的存在。
RNA polymerase II (pol II) transcribes genes encoding proteins and non-coding small nuclear (sn)RNAs. The carboxy-terminal domain (CTD) of the largest subunit of mammalian RNA polymerase II (pol II), comprising tandem repeats of the heptapeptide consensus tyr1ser2pro3thr4ser5pro6ser7, is required for expression of both gene types. Here, we show that mutation of ser7 to alanine causes a specific defect in snRNA gene expression. We also present evidence that phosphorylation of ser7 facilitates interaction with the snRNA gene-specific Integrator complex. These findings asign a biological function to this amino acid and highlight a gene type-specific requirement for a residue within the CTD heptapeptide, supporting the existence of a CTD code.
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