Systematic mutational analysis of the LytTR DNA binding domain of Staphylococcus aureus virulence gene transcription factor AgrA.

Systematic mutational analysis of the LytTR DNA binding domain of Staphylococcus aureus virulence gene transcription factor AgrA.
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DOI:
10.1093/nar/gku1015
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发表时间:
2014-11-10
影响因子:
14.9
通讯作者:
Wigneshweraraj S
Wigneshweraraj S
中科院分区:
生物学2区
文献类型:
--
作者:
Nicod SS;Weinzierl RO;Burchell L;Escalera-Maurer A;James EH;Wigneshweraraj S

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大多数 DNA 结合细菌转录因子通过其 DNA 结合域中的识别 α 螺旋接触 DNA。一类新兴的 DNA 结合转录因子主要存在于病原菌中,通过一种相对新颖的 DNA 结合结构域(称为 LytTR 结构域)与 DNA 相互作用,该结构域主要包含 β 链。尽管来自金黄色葡萄球菌的毒力基因转录因子 AgrA 的 LytTR 结构域与其同源 DNA 序列结合的晶体结构是已知的,但 AgrA 的 LytTR 结构域中的特定氨基酸残基对转录激活的贡献仍然难以捉摸。在这里,我们首次系统地研究了氨基酸残基在含有 LytTR 结构域的转录因子中转录激活中的作用。我们的分析涉及金黄色葡萄球菌 AgrA 的体内和体外分析以及分子动力学模拟,鉴定出高度保守的酪氨酸残基 Y229,作为 AgrA 最大程度激活转录的主要氨基酸决定因素,并为金黄色葡萄球菌 AgrA 的结构-功能关系提供了新的见解。
Most DNA-binding bacterial transcription factors contact DNA through a recognition α-helix in their DNA-binding domains. An emerging class of DNA-binding transcription factors, predominantly found in pathogenic bacteria interact with the DNA via a relatively novel type of DNA-binding domain, called the LytTR domain, which mainly comprises β strands. Even though the crystal structure of the LytTR domain of the virulence gene transcription factor AgrA from Staphylococcus aureus bound to its cognate DNA sequence is available, the contribution of specific amino acid residues in the LytTR domain of AgrA to transcription activation remains elusive. Here, for the first time, we have systematically investigated the role of amino acid residues in transcription activation in a LytTR domain-containing transcription factor. Our analysis, which involves in vivo and in vitro analyses and molecular dynamics simulations of S. aureus AgrA identifies a highly conserved tyrosine residue, Y229, as a major amino acid determinant for maximal activation of transcription by AgrA and provides novel insights into structure–function relationships in S. aureus AgrA.
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