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在细菌病原体中,Scs系统将铜和氧化还原稳态连接起来

Andrea A E Méndez¹, José M Argüello², Fernando C Soncini¹

¹Instituto de Biología Molecular y Celular de Rosario, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Consejo Nacional de Investigaciones Científicas y Técnicas, Rosario, Argentina.

The Journal of biological chemistry

|February 3, 2024

概括

沙门氏菌细菌拥有独特的Scs系统来管理铜和氧化应激,补充标准的DSB系统. 这种适应对于宿主-病原体相互作用期间的生存至关重要.

科学领域:

微生物学微生物学
细菌病原体的产生
转毒生物学转毒生物学

背景情况:

细菌外对于细胞功能,新陈代谢和防御环境压力因素至关重要.
宿主-病原体相互作用可以破坏包膜恒温,特别是通过活性氧物种和过多的铜的氧化损伤.
氧化应激,特别是来自铜,可以通过硫醇氧化导致蛋白质损伤,从而危及细菌的生存.

研究的目的:

为了研究沙门氏菌特异性Scs (沙门氏菌铜应力) 系统,一种结合铜的氧化还原酶系统.
了解ScsABCD复合体在管理细菌外内的铜和氧化还原应激中的作用.
探索Scs系统在应对宿主-病原体接口需求时的进化获取.

主要方法:

描述ScsABCD复合体,包括其组成部分ScsC,ScsB,ScsD和ScsA.
对scsABCD位点及其融入监管途径的分析.
与正规的DSB (二硫化键) 系统进行比较分析.

主要成果:

该Scs系统包括Cu+结合蛋白 (ScsC/ScsB) 具有醇氧降解酶活性和膜结合的ScsD.
ScsA与过氧化物耐药性有关,这表明它在应激防御中扮演着多方面的角色.
获得Scs系统并集成到铜应力反应的全球监管途径中.

结论:

佳能DSB系统不足以满足在宿主-病原体相互作用期间的醇组保护需求.
沙门氏菌特有的Scs系统是为了应对铜和氧化还原应激而进化的,补充了DSb系统.
在具有挑战性的宿主环境中,ScsABCD复合体对于细菌的生存和适应至关重要,可能在其他病原体中也是如此.

关键词:

如何保持恒常状态 Cu homeostasis 格拉姆阴性细菌是一种细菌.主体-病原体相互作用周离子体周离子体.氧化还原应激的压力.醇氧化降解酶的作用

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