Mutational analysis of betaCOP (Sec26p) identifies an appendage domain critical for function.

Mutational analysis of betaCOP (Sec26p) identifies an appendage domain critical for function.
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BETACOP的突变分析(SEC26P)确定了一个对功能至关重要的附属域。

DOI:
10.1186/1471-2121-9-3
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发表时间:
2008-01-22
期刊:
影响因子:
--
通讯作者:
Collins, Ruth N.
Collins, Ruth N.
中科院分区:
生物3区
文献类型:
--
作者:
DeRegis, Carol J.;Rahl, Peter B.;Hoffman, Gregory R.;Cerione, Richard A.;Collins, Ruth N.

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COPI囊泡外壳的γCOP亚基的附件结构域与适配蛋白家族附件具有惊人的结构相似性,尽管一级序列同源性有限。γCOP的附属结构域和βCOP上的一个等价区域都含有FxxxW基序;该基序的保守性表明βCOP中存在功能性附属结构域。结合结构预测工具的序列比较表明,强烈预测的倍的COOH-末端的Sec 26 p密切模仿的适应素家族的附属物。Sec 26 p的附属结构域的缺失导致酵母中的失活,缺失构建体的过表达是显性阴性的,并且该区域的诱变鉴定了对功能至关重要的残基。ArfGAP Glo 3 p通过抑制筛选被鉴定为Sec 26 p的潜在下游调节剂,其方式独立于Glo 3 p差距活性,但需要存在COOH-末端ISS基序。总之,这些结果表明预测的βCOP附件的基本功能,并表明两个COPI附件执行生物活性调节作用,其结构与适应素家族附件结构域相关。
The appendage domain of the γCOP subunit of the COPI vesicle coat bears a striking structural resemblance to adaptin-family appendages despite limited primary sequence homology. Both the γCOP appendage domain and an equivalent region on βCOP contain the FxxxW motif; the conservation of this motif suggested the existence of a functional appendage domain in βCOP. Sequence comparisons in combination with structural prediction tools show that the fold of the COOH-terminus of Sec26p is strongly predicted to closely mimic that of adaptin-family appendages. Deletion of the appendage domain of Sec26p results in inviability in yeast, over-expression of the deletion construct is dominant negative and mutagenesis of this region identifies residues critical for function. The ArfGAP Glo3p was identified via suppression screening as a potential downstream modulator of Sec26p in a manner that is independent of the GAP activity of Glo3p but requires the presence of the COOH-terminal ISS motifs. Together, these results indicate an essential function for the predicted βCOP appendage and suggest that both COPI appendages perform a biologically active regulatory role with a structure related to adaptin-family appendage domains.
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