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The Human Candidate Tumor Suppressor Gene HIC1 Recruits CtBP through a Degenerate GLDLSKK Motif

机译:人类候选肿瘤抑制基因HIC1通过简并的GLDLSKK基序招募CtBP

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HIC1 (hypermethylated in cancer) and its close relative HRG22 (HIC1-related gene on chromosome 22) encode transcriptional repressors with five C2H2 zinc fingers and an N-terminal BTB/POZ autonomous transcriptional repression domain that is unable to recruit histone deacetylases (HDACs). Alignment of the HIC1 and HRG22 proteins from various species highlighted a perfectly conserved GLDLSKK/R motif highly related to the consensus CtBP interaction motif (PXDLSXK/R), except for the replacement of the virtually invariant proline by a glycine. HIC1 strongly interacts with mCtBP1 both in vivo and in vitro through this conserved GLDLSKK motif, thus extending the CtBP consensus binding site. The BTB/POZ domain does not interact with mCtBP1, but the dimerization of HIC1 through this domain is required for the interaction with mCtBP1. When tethered to DNA by fusion with the Gal4 DNA-binding domain, the HIC1 central region represses transcription through interactions with CtBP in a trichostatin A-sensitive manner. In conclusion, our results demonstrate that HIC1 mediates transcriptional repression by both HDAC-independent and HDAC-dependent mechanisms and show that CtBP is a HIC1 corepressor that is recruited via a variant binding site.
机译: HIC1 (在癌症中发生甲基化)及其近亲 HRG22 (22号染色体上的 HIC1 相关基因)编码具有5个C 的转录阻遏物2 H 2 锌指和一个N端BTB / POZ自主转录抑制域,该域不能募集组蛋白脱乙酰基酶(HDAC)。来自各种物种的HIC1和HRG22蛋白的比对突出了与保守CtBP相互作用基序(PXDLSXK / R)高度相关的完美保守的GLDLSKK / R基序,除了甘氨酸替代了几乎不变的脯氨酸。 HIC1通过这种保守的GLDLSKK基序在体内和体外均与mCtBP1强烈相互作用,从而扩展了CtBP共有结合位点。 BTB / POZ域不与mCtBP1相互作用,但是HIC1通过该域的二聚化是与mCtBP1相互作用所必需的。当通过与Gal4 DNA结合结构域融合而束缚在DNA上时,HIC1中央区域通过对曲古菌素A敏感的方式通过与CtBP的相互作用抑制转录。总之,我们的结果表明,HIC1通过HDAC独立和HDAC依赖机制介导转录抑制,并显示CtBP是通过变异结合位点募集的HIC1核心抑制剂。

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