A WW-like module in the RAG1 N-terminal domain contributes to previously unidentified protein-protein interactions.

A WW-like module in the RAG1 N-terminal domain contributes to previously unidentified protein-protein interactions.
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DOI:
10.1093/nar/gkp192
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发表时间:
2009-06
影响因子:
14.9
通讯作者:
Sadofsky MJ
Sadofsky MJ
中科院分区:
生物学2区
文献类型:
--
作者:
Maitra R;Sadofsky MJ

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超过三分之一的RAG 1蛋白可以从N-末端截短,对体外或小鼠中的V(D)J重组产物只有轻微的影响。那么,N端结构域的功能是什么呢?我们认为这是监管。几年前,我们确定了一个包含的RING基序可以作为泛素E3连接酶发挥作用。这种活性是否仅限于自动修饰,或者可能改变细胞中的其他蛋白质,仍然是一个悬而未决的问题。我们通过酵母双杂交试验重新讨论了RAG 1和其他蛋白质之间的额外蛋白质-蛋白质相互作用的问题。我们证实了KPNA 2/RCH 1/SRP 1 α之间的相互作用,并发现了另外两个相互作用--转录因子GMEB 1/PIF p96和剪接因子SF 3A 2/SF 3a 66。荧光素酶报告基因测定表明,含有RAG蛋白和转录因子的蛋白质复合物可以在细胞中组装。进一步的映射确定了类似WW基序的N-末端结构域内的区域。针对WW基序中保守残基的点突变消除了与其中一个伴侣的结合。系统发育分析表明,该蛋白具有高度保守性。该模块有助于蛋白质-蛋白质相互作用,这也可能影响RAG 1如何结合DNA靶标。
More than one-third of the RAG1 protein can be truncated from the N-terminus with only subtle effects on the products of V(D)J recombination in vitro or in a mouse. What, then, is the function of the N-terminal domain? We believe it to be regulatory. We determined, several years ago, that an included RING motif could function as an ubiquitin E3 ligase. Whether this activity is limited to automodification, or may alter other proteins in the cell, remains an open question. We revisited the issue of additional protein–protein interactions between RAG1 and other proteins by means of the yeast two-hybrid assay. We confirmed the interaction already described with KPNA2/RCH1/SRP1α and found two others—to the transcription factor GMEB1/PIF p96 and the splicing factor SF3A2/SF3a66. A luciferase reporter assay demonstrates that a protein complex containing RAG proteins and the transcription factor can assemble in cells. Further mapping identified a region within the N-terminal domain resembling a WW motif. Point mutation directed at residues conserved in WW motifs eliminated binding to one of the partners. Phylogenetic analysis shows the WW-like module to be highly conserved. The module contributes to protein–protein interactions that may also influence how RAG1 binds DNA targets.
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