Functional characterization of protein 4.1 homolog in amphioxus: defining a cryptic spectrin-actin-binding site.

Functional characterization of protein 4.1 homolog in amphioxus: defining a cryptic spectrin-actin-binding site.
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文昌鱼中蛋白质 4.1 同源物的功能表征:定义一个神秘的血影蛋白-肌动蛋白结合位点

DOI:
10.1038/srep02873
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发表时间:
2013-10-07
期刊:
影响因子:
4.6
通讯作者:
Zhang S
Zhang S
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Wang L;Wang Y;Li Z;Gao Z;Zhang S

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脊椎动物4.1蛋白具有一个光影蛋白-肌动蛋白结合(SAB)结构域,这是目前已鉴定的所有无脊椎动物4.1蛋白中所缺少的,因此有人认为SAB结构域是随着脊椎动物的进化而出现的。在这里,我们首次证明了文昌鱼(一种无脊椎动物脊索动物)蛋白4.1,尽管缺乏可识别的SAB,但能够与幽灵蛋白和肌动蛋白结合,结合能力与人类蛋白4.1相当。详细的构效关系分析表明,独特的结构域U2/3是一个新发现的SAB样结构域,能够与幽灵蛋白和肌动蛋白相互作用,这表明文昌鱼4.1蛋白中存在一个“隐蔽的”SAB结构域。文昌鱼4.1蛋白基因是脊椎动物4.1蛋白基因的共同祖先,4.1R、4.1N、4.1G和4.1B基因起源于文昌鱼4.1蛋白基因。这项工作将促进无脊椎动物4.1蛋白及其相互作用蛋白结构活性的进一步研究。
Vertebrate 4.1 proteins have a spectrin-actin-binding (SAB) domain, which is lacking in all the invertebrate 4.1 proteins indentified so far and it was therefore proposed that the SAB domain emerged with the advent of vertebrates during evolution. Here we demonstrated for the first time that amphioxus (an invertebrate chordate) protein 4.1, though lacking a recognizable SAB, was able to bind both spectrin and actin, with a binding capacity comparable to that of human protein 4.1. Detailed structure-activity analyses revealed that the unique domain U2/3 was a newly identified SAB-like domain capable of interacting with spectrin and actin, suggesting the presence of a “cryptic” SAB domain in amphioxus 4.1 protein. We also showed that amphioxus 4.1 protein gene was the common ancestor of vertebrate 4.1 protein genes, from which 4.1R, 4.1N, 4.1G and 4.1B genes originated. This work will encourage further study on the structure-activity of invertebrate 4.1 protein and its interacting proteins.
DOI: 10.1016/j.tracli.2010.06.008
发表时间: 2010-09-01
影响因子: 1.7
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通讯作者: Baines, A. J.
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发表时间: 2009-12-01
期刊: BIOSCIENCE REPORTS
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影响因子: 4
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