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首页> 外文期刊>Journal of Cell Science >Structure and function analysis of the C-elegans aminophospholipid translocase TAT-1
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Structure and function analysis of the C-elegans aminophospholipid translocase TAT-1

机译:C-elegans氨基磷脂旋流酶TAT-1的结构和功能分析

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The Caenorhabditis elegans aminophospholipid translocase TAT-1 maintains phosphatidylserine (PS) asymmetry in the plasma membrane and regulates endocytic transport. Despite these important functions, the structure-function relationship of this protein is poorly understood. Taking advantage of the tat-1 mutations identified by the C. elegans million mutation project, we investigated the effects of 16 single amino acid substitutions on the two functions of the TAT-1 protein. Two substitutions that alter a highly conserved PISL motif in the fourth transmembrane domain and a highly conserved DKTGT phosphorylation motif, respectively, disrupt both functions of TAT-1, leading to a vesicular gut defect and ectopic PS exposure on the cell surface, whereas most other substitutions across the TAT-1 protein, often predicted to be deleterious by bioinformatics programs, do not affect the functions of TAT-1. These results provide in vivo evidence for the importance of the PISL and DKTGT motifs in P4-type ATPases and improve our understanding of the structure-function relationship of TAT-1. Our study also provides an example of how the C. elegans million mutation project helps decipher the structure, functions, and mechanisms of action of important genes.
机译:Caenorhabditis elegans氨磷脂磷脂易位酶TAT-1在质膜中维持磷脂酰丝氨酸(PS)不对称性,并调节内织种转运。尽管有这些重要的功能,但这种蛋白质的结构功能关系尚未理解。利用由C.兆瓦升百万突变项目鉴定的TAT-1突变,我们研究了16个单氨基酸取代对TAT-1蛋白的两种功能的影响。在第四跨膜结构域中改变高度保守的PISL基序和高度保守的DKTGT磷酸化基序的两种取代,破坏TAT-1的两种功能,导致细胞表面上的凹凸肠缺损和异位PS暴露,而大多数其他通过生物信息学计划,常常预测替换TAT-1蛋白的替代,不会影响TAT-1的功能。这些结果为P4型ATP制定的PISL和DKTGT主题的重要性提供了体内证据,并改善了我们对TAT-1结构功能关系的理解。我们的研究还提供了C.埃贝罗斯百万突变项目如何有助于破译重要基因的结构,功能和机制的一个例子。

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