Analysis of the Nse3/MAGE-binding domain of the Nse4/EID family proteins.

Analysis of the Nse3/MAGE-binding domain of the Nse4/EID family proteins.
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DOI:
10.1371/journal.pone.0035813
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Palecek J
Palecek J
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Guerineau M;Kriz Z;Kozakova L;Bednarova K;Janos P;Palecek J

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Nse1、Nse3 和 Nse4 蛋白形成大 SMC5-6 蛋白复合物的紧密亚复合物。 hNSE3/MAGEG1 是 Nse3 的哺乳动物直系同源物,是 MAGE(黑色素瘤相关抗原)蛋白家族的创始成员,Nse4 kleisin 亚基与 EID(E1A 样分化抑制剂)蛋白家族相关。我们最近表明,人类 MAGE 蛋白可以通过其特有的保守疏水口袋与 NSE4/EID 蛋白相互作用。通过诱变和蛋白质-蛋白质相互作用分析,我们鉴定了 Nse4/EID 蛋白质的一个新的 Nse3/MAGE 结合域 (NMBD)。该短结构域位于 Nse4 N 末端 kleisin 基序旁边,在所有 NSE4/EID 蛋白中都是保守的。在酵母双杂交测定中,人 NSE4b/EID3 结构域的中心氨基酸残基对于其与 hNSE3/MAGEG1 的结合至关重要,表明它们形成了结合结构域的核心。 PEPSCAN ELISA 测量 MAGEC2 与 EID2 突变肽的结合亲和力表明,相似的核心残基有助于 EID2-MAGEC2 相互作用。此外,EID2结合域的N端延伸参与了EID2-MAGEC2相互作用。最后,对接和分子动力学模拟使我们能够生成EID2-MAGEC2的结构模型。我们的实验数据和结构模型的结合显示了 NSE4/EID 结构域的核心螺旋区域如何结合到 MAGE 蛋白家族的保守口袋特征中。我们鉴定了一个新的 Nse4/EID 保守结构域,并表征了其与 Nse3/MAGE 蛋白的结合。相互作用表面的保守性和结合表明 Nse4/EID 和 Nse3/MAGE 蛋白家族紧密的共同进化。
The Nse1, Nse3 and Nse4 proteins form a tight sub-complex of the large SMC5-6 protein complex. hNSE3/MAGEG1, the mammalian ortholog of Nse3, is the founding member of the MAGE (melanoma-associated antigen) protein family and the Nse4 kleisin subunit is related to the EID (E1A-like inhibitor of differentiation) family of proteins. We have recently shown that human MAGE proteins can interact with NSE4/EID proteins through their characteristic conserved hydrophobic pocket. Using mutagenesis and protein-protein interaction analyses, we have identified a new Nse3/MAGE-binding domain (NMBD) of the Nse4/EID proteins. This short domain is located next to the Nse4 N-terminal kleisin motif and is conserved in all NSE4/EID proteins. The central amino acid residues of the human NSE4b/EID3 domain were essential for its binding to hNSE3/MAGEG1 in yeast two-hybrid assays suggesting they form the core of the binding domain. PEPSCAN ELISA measurements of the MAGEC2 binding affinity to EID2 mutant peptides showed that similar core residues contribute to the EID2-MAGEC2 interaction. In addition, the N-terminal extension of the EID2 binding domain took part in the EID2-MAGEC2 interaction. Finally, docking and molecular dynamic simulations enabled us to generate a structure model for EID2-MAGEC2. Combination of our experimental data and the structure modeling showed how the core helical region of the NSE4/EID domain binds into the conserved pocket characteristic of the MAGE protein family. We have identified a new Nse4/EID conserved domain and characterized its binding to Nse3/MAGE proteins. The conservation and binding of the interacting surfaces suggest tight co-evolution of both Nse4/EID and Nse3/MAGE protein families.
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