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首页> 外文期刊>Molecular and Cellular Biology >Schizosaccharomyces pombe Ddb1 Recruits Substrate-Specific Adaptor Proteins through a Novel Protein Motif, the DDB-Box
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Schizosaccharomyces pombe Ddb1 Recruits Substrate-Specific Adaptor Proteins through a Novel Protein Motif, the DDB-Box

机译:Schizosaccharomyces pombe Ddb1通过新型蛋白基序DDB-Box募集底物特异性衔接蛋白

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DDB1 was isolated as a UV-damaged DNA-binding protein, but recent studies established that it plays a role as a component of cullin 4A ubiquitin ligases. Cullin-RING complexes are the largest known ubiquitin ligase family, with hundreds of substrate-specific adaptor subunits and which are defined by characteristic motifs. A common motif for DDB1/cullin 4 ubiquitin ligases, a WDXR motif, was recently reported. Here, we show that Schizosaccharomyces pombe Ddb1 associates with several WD40 repeat proteins that share a novel protein motif designated the DDB-box, a motif essential for interaction with Ddb1 and independent of WD40 repeats, unlike the WDXR motif. We also show that ddb1+ and the putative CSA homolog ckn1+ are involved in transcription-coupled nucleotide excision repair and that the DDB-box is essential for the ckn1+ function in vivo. These data indicate that the DDB-box is another common motif which defines adaptor proteins for DDB1/cullin 4 ubiquitin ligases.
机译:DDB1是作为紫外线损伤的DNA结合蛋白被分离出来的,但是最近的研究表明,它是cullin 4A泛素连接酶的组成部分。 Cullin-RING复合物是已知的最大泛素连接酶家族,具有数百个底物特异性衔接子亚基,并由特征性基序定义。最近报道了DDB1 / cullin 4泛素连接酶的常见基序,即WDXR基序。在这里,我们显示裂殖酵母(Schizosaccharomyces pombe) Ddb1与几个WD40重复蛋白相关联,这些WD40重复蛋白共享一个称为DDB-box的新型蛋白基序,该基序是与Ddb1相互作用且不依赖WD40重复的必不可少的基序,与WDXR基序。我们还表明,涉及到 ddb1 + 和推定的 CSA 同源物 ckn1 + 在转录偶联核苷酸切除修复中的作用,DDB-box对体内 ckn1 + 功能至关重要。这些数据表明,DDB-box是另一个常见的基序,它定义了DDB1 / cullin 4泛素连接酶的衔接蛋白。

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