首页> 外文期刊>The Journal of biological chemistry >A Tandem SH2 Domain in Transcription Elongation Factor Spt6 Binds the Phosphorylated RNA Polymerase II C-terminal Repeat Domain (CTD)
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A Tandem SH2 Domain in Transcription Elongation Factor Spt6 Binds the Phosphorylated RNA Polymerase II C-terminal Repeat Domain (CTD)

机译:转录伸长因子SPT6中的串联SH2结构域结合磷酸化的RNA聚合酶II C-末端重复域(CTD)

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Spt6 is an essential transcription elongation factor and histone chaperone that binds the C-terminal repeat domain (CTD) of RNA polymerase II. We show here that Spt6 contains a tandem SH2 domain with a novel structure and CTD-binding mode. The tandem SH2 domain binds to a serine 2-phosphorylated CTD peptide in vitro, whereas its N-terminal SH2 subdomain, which we previously characterized, does not. CTD binding requires a positively charged crevice in the C-terminal SH2 subdomain, which lacks the canonical phospho-binding pocket of SH2 domains and had previously escaped detection. The tandem SH2 domain is apparently required for transcription elongation in vivo as its deletion in cells is lethal in the presence of 6-azauracil.
机译:SPT6是结合RNA聚合酶II的C末端重复域(CTD)的基本转录伸长率因子和组蛋白伴侣。我们在这里展示SPT6包含具有新颖结构和CTD结合模式的串联SH2域。串联SH2结构域在体外与丝氨酸2-磷酸化的CTD肽结合,而我们以前表征的N-末端SH2子域则不结合。 CTD结合需要在C末端SH2子域中具有带正电荷的缝隙,其缺乏SH2结构域的规范磷光袋,并且先前脱落了检测。串联SH2结构域显然需要体内转录伸长率,因为它在细胞中的缺失在6-αzauracil存在下是致命的。

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