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Pseudomonas aeruginosa PfpI是一种甲基氧酶

Larson Grimm¹, Andre Wijaya¹, Isabel Askenasy¹

¹Department of Biochemistry, University of Cambridge, Cambridge, UK.

The Journal of biological chemistry

|March 5, 2025

概括

Pseudomonas aeruginosa PfpI被确定为甲基氧酶,而不是细胞内蛋白酶. 结构和生化数据证实了它的酶活性,揭示了它在病原体中的真正生物学作用.

科学领域:

微生物学微生物学
结构生物学结构生物学
酶学是一种酶学.

背景情况:

Pseudomonas aeruginosa 是一种与人类呼吸道感染有关的机会性病原体.
PfpI最初被注释为细胞内蛋白酶,基于其与Pyrococcus furiosus蛋白酶I的序列相似性.

研究的目的:

为了确定Pseudomonas aeruginosa PfpI.的实际酶功能.
阐明PfpI的结构和生化特征.
为了研究PfpI在Pseudomonas aeruginosa中的体内作用.

主要方法:

用X射线结晶学来确定蛋白质结构.
核磁共振 (NMR) 谱学以确认酶活性.
位点定向突变发生,以评估活性位点残留物.
对 ΔpfpI 删除突变的定量蛋白质组分析.
之前描述的突变体的全基因组测序.

主要成果:

证实PfpI是一种甲基环氧酶,将甲基环氧素转化为乳酸.
X射线晶体结构显示了类似于大肠杆菌YhbO.的保存活性部位残留物 (Cys112,His113).
动力分析显示kcat为102min-1和KM为369μM.
在Cys112和His113的突变取消了甲基氧酶活性.
对ΔpfpI突变体的蛋白质组分析显示了核糖体功能,C1代谢和谷氨代谢的干扰.
该ΔpfpI突变体没有表现出以前与pfpI::Tn突变体相关的表型,这些表型被归因于其他遗传变化.

结论:

在Pseudomonas aeruginosa中,PfpI作为一种谷氨独立的甲基氧酶起作用.
以前报告的pfpI::Tn突变的表型可能是由于混杂的基因突变.
这项研究澄清了PfpI的真正酶功能和生物相关性.

关键词:

伪omonas空气菌伪omonas空气菌这是一个ThiJ/DJ-1/PfpI超级家族.排毒排毒排毒排毒酶结构酶结构代谢代谢代谢代谢甲基格里奥克萨尔 (Methylglyoxal) 是一种微生物的新陈代谢一个突变的突变者.蛋白质组学蛋白质组学

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