来自Acinetobacter baumannii的双功能酶PaaY的机制和结构洞察力
Min Jiao1, Wenbo He1, Zhenlin Ouyang1
1Center for Microbiome Research of Med-X Institute, Shaanxi Provincial Key Laboratory of Sepsis in Critical Care Medicine, The First Affiliated Hospital, Xi'an Jiaotong University, Xi'an 710061, China.
Acinetobacter baumannii PaaY是一种具有铁酶和碳酸酶活性的双功能酶. 这种酶对细菌生长,生物膜形成和对过氧化的抗性至关重要.
科学领域:
- 生物化学 生物化学
- 微生物学 微生物学
- 结构生物学 结构生物学
背景情况:
- PaaY是一种参与细菌中通过酸 (PA) 途径降解有毒代谢物的化酶.
- 在Acinetobacter baumannii基因FQU82_01591编码的PaaY酶.
研究的目的:
- 描述Acinetobacter baumannii PaaY.的酶活性和结构特征.
- 研究AbPaaY在细菌生长,生物膜形成和抗压力方面的作用.
主要方法:
- 酶活性测定硫酶和碳酸无酶.
- 进行X射线晶体学以确定AbPaaY.Y的结构.
- 基因淘汰实验用于评估体内功能.
主要成果:
- AbPaaY既表现出化酶活性,偏好劳洛伊尔-CoA,也表现出γ-碳酸无水酶活性.
- 晶体结构显示出一个具有正规 γ-碳酸无水酶活性位点和独特的域互换 C-终端的同分离体.
- 域互换的C-终端增强了酶的稳定性,并影响了基质的特异性,而不会改变碳酸无水酶的活性.
- AbPaaY淘汰会对PA介质中的A. baumannii生长产生负面影响,减少生物膜的形成,并降低过氧化的抗性.
结论:
- AbPaaY是一种双功能酶,对A. baumannii的新陈代谢,生长和应激反应至关重要.
- 域互换C端的独特结构特征有助于酶的稳定性和功能.
- PaaY在A. baumannii的生存和毒性方面发挥着重要作用.
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