Phosphorylation of glucocorticoid receptor tau1c transactivation domain enhances binding to CREB binding protein (CBP) TAZ2.

Phosphorylation of glucocorticoid receptor tau1c transactivation domain enhances binding to CREB binding protein (CBP) TAZ2.
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糖皮质激素受体 tau1c 反式激活结构域的磷酸化增强与 CREB ​​结合蛋白 (CBP) TAZ2 的结合。

DOI:
10.1016/j.bbrc.2014.12.021
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发表时间:
2015
影响因子:
3.1
通讯作者:
Webb,Paul
Webb,Paul
中科院分区:
生物学4区
文献类型:
--
作者:
Carruthers,CarlW;Suh,JiHo;Gustafsson,Jan-Ake;Webb,Paul

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糖皮质激素受体(GR) n端结构域(NTD)包含一个反激活结构域(激活功能1;AF-1)。GR AF-1被磷酸化,但这种修饰对AF-1活性和辅因子募集的影响尚不完全清楚。GR AF-1的活性主要局限于一个叫做tau1c的短非结构化结构域(氨基酸187-244),该结构域包含三个磷酸化位点,并结合促激活因子CREB结合蛋白(CBP)的短半胱氨酸富片段(CH3)。由于CH3结构域与CBP转录适配子锌结合(TAZ) 2结构域重叠,与其他非结构化转录因子结构域的磷酸化依赖性结合有关,因此我们开始研究GR是否与TAZ2相互作用,以及这种结合事件是否受到磷酸化的调节。我们发现GR tau1c对于增强培养细胞的GR功能和GR/CBP关联是绝对必需的。Tau1c与taz2在体外相互作用,肽图谱揭示了整个Tau1c中的CBP结合决定因素。GR Ser203位点的磷酸化,不参与反活化,不影响tau1c/TAZ2相互作用。然而,作为GR转录活性标记的Ser211和Ser226位点的磷酸化,以协同方式极大地增强了TAZ2的结合。我们认为GR tau1c磷酸化可以促进CBP的募集,增强AF-1的活性。
The glucocorticoid receptor (GR) N-terminal domain (NTD) contains a transactivation domain (activation function 1; AF-1). GR AF-1 is phosphorylated, but effects of this modification upon AF-1 activity and cofactor recruitment are not completely clear. GR AF-1 activity is mostly confined to a short unstructured domain called tau1c (amino acids 187–244) that contains three phosphorylation sites and binds a short cysteine rich fragment (CH3) of the coactivator CREB binding protein (CBP). Since the CH3 domain overlaps the CBP transcriptional adaptor zinc binding (TAZ) 2 domain, implicated in phosphorylation dependent binding to other unstructured transcription factor domains, we set out to investigate whether GR interacts with TAZ2 and whether this binding event is modulated by phosphorylation. We find that GR tau1c is absolutely required for enhancement of GR function and GR/CBP association in cultured cells. Tau1c interacts with TAZ2in vitroand peptide mapping reveals CBP binding determinants throughout tau1c. Phosphorylation at GR Ser203, not involved in transactivation, does not affect tau1c/TAZ2 interactions. However, phosphorylation at Ser211 and Ser226, markers of GR transcriptional activity, greatly enhances TAZ2 binding in a synergistic fashion. We propose that GR tau1c phosphorylation could promote CBP recruitment and enhance AF-1 activity.
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