The human EKC/KEOPS complex is recruited to Cullin2 ubiquitin ligases by the human tumour antigen PRAME.

The human EKC/KEOPS complex is recruited to Cullin2 ubiquitin ligases by the human tumour antigen PRAME.
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DOI:
10.1371/journal.pone.0042822
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Stunnenberg HG
Stunnenberg HG
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Costessi A;Mahrour N;Sharma V;Stunnenberg R;Stoel MA;Tijchon E;Conaway JW;Conaway RC;Stunnenberg HG

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人肿瘤抗原PRAME(在黑色素瘤中优先表达的抗原)在肿瘤发生期间经常过表达,并且高PRAME水平与多种癌症中的不良临床结果相关。然而,PRAME涉及的分子途径还没有很好地理解。我们最近的特点PRAME作为一个Cullin 2为基础的E3泛素连接酶的BC盒亚基。在这项研究中,我们挖掘PRAME相互作用组更深层次,并确定了特定的相互作用与OSGEP和LAGE 3,这是人类的直系同源的古老的EKC/KEOPS复合体。通过生物化学特征的人EKC复合物及其与PRAME的相互作用,我们表明,PRAME招聘Cul 2泛素连接酶EKC。此外,EKC亚基与染色质上的PRAME靶位点相关。我们的数据揭示了癌蛋白PRAME和保守的EKC复合体之间的新联系,并支持这两种复合体在相同途径中的作用。
The human tumour antigen PRAME (preferentially expressed antigen in melanoma) is frequently overexpressed during oncogenesis, and high PRAME levels are associated with poor clinical outcome in a variety of cancers. However, the molecular pathways in which PRAME is implicated are not well understood. We recently characterized PRAME as a BC-box subunit of a Cullin2-based E3 ubiquitin ligase. In this study, we mined the PRAME interactome to a deeper level and identified specific interactions with OSGEP and LAGE3, which are human orthologues of the ancient EKC/KEOPS complex. By characterizing biochemically the human EKC complex and its interactions with PRAME, we show that PRAME recruits a Cul2 ubiquitin ligase to EKC. Moreover, EKC subunits associate with PRAME target sites on chromatin. Our data reveal a novel link between the oncoprotein PRAME and the conserved EKC complex and support a role for both complexes in the same pathways.
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