Molecular evolution of threonine dehydratase in bacteria.

Molecular evolution of threonine dehydratase in bacteria.
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细菌中苏氨酸脱水酶的分子进化

DOI:
10.1371/journal.pone.0080750
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Wang X
Wang X
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Yu X;Li Y;Wang X

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苏氨酸脱水酶将l -苏氨酸转化为2-酮丁酸盐。细菌中存在几种苏氨酸脱水酶,但其起源和进化途径尚不清楚。在这里,我们分析了细菌中所有可用的苏氨酸脱水酶,并提出了一种进化途径,导致基因编码三种不同的苏氨酸脱水酶CTD, BTD1和BTD2。祖先苏氨酸脱水酶可能只包含一个催化结构域,但在进化过程中融合了一个或两个act样亚结构域,分别产生了BTD1和BTD2。水平基因转移、基因融合、基因复制和基因缺失可能发生在该酶的进化过程中。这些结果对于理解细菌中发现的各种苏氨酸脱水酶的功能具有重要意义。
Threonine dehydratase converts L-threonine to 2-ketobutyrate. Several threonine dehydratases exist in bacteria, but their origins and evolutionary pathway are unknown. Here we analyzed all the available threonine dehydratases in bacteria and proposed an evolutionary pathway leading to the genes encoding three different threonine dehydratases CTD, BTD1 and BTD2. The ancestral threonine dehydratase might contain only a catalytic domain, but one or two ACT-like subdomains were fused during the evolution, resulting BTD1 and BTD2, respectively. Horizontal gene transfer, gene fusion, gene duplication, and gene deletion may occur during the evolution of this enzyme. The results are important for understanding the functions of various threonine dehydratases found in bacteria.
DOI: 10.1016/j.resmic.2009.05.001
发表时间: 2009-09-01
影响因子: 2.6
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