CyaY和Tusa调节ISC和SUF介导的l-氨酸脱硫酶活动
Paolo Olivieri1, Jason C Crack2, Angelika Lehmann1
1Institute of Biochemistry and Biology, Department of Molecular Enzymology, University of Potsdam D-14476 Potsdam Germany sleim@uni-potsdam.de +49-331-977-5128 +49-331-977-5603.
RSC chemical biology
|October 7, 2024
概括
CyaY通过与IscS和SufS的相互作用来调节铁硫集群的硫供应. TusA从IscS中取代CyaY,将硫转向其他途径.
科学领域:
- 分子生物学分子生物学
- 生物化学 生物化学
- 微生物学 微生物学
背景情况:
- 在大肠杆菌中的弗拉塔克辛同类物CyaY对于铁硫 (ISC) 组装至关重要.
- 囊脱硫酶IscS调节ISC组装的硫供应以及其他途径,如Moco和化tRNA生物合成.
- 蛋白质与蛋白质的相互作用,如IscU和TusA竞争IscS结合,是平衡硫分布的关键.
研究的目的:
- 调查CyaY在E. coli中硫供应调节中的作用.
- 阐明涉及CyaY,IscS,Tusa和SUF路径组件SufS和SufE的交互网络.
- 了解TusA如何通过与IscS-CyaY复合体相互作用来影响硫的分布.
主要方法:
- 使用原生质谱学研究了蛋白质与蛋白质相互作用.
- 在实验室中评估了CyaY对SufSE脱硫酶活性的影响.
- 研究了CyaY过度表达对细胞脱硫酶活性和野生型和突变大肠杆菌菌株Fe-S集群组合的影响.
主要成果:
- TusA可以从IscS中取代CyaY,与IscS,CyaY和TusA形成异质复合体.
- CyaY与SufSE复合体结合,可能与SufE竞争,并在体外显著抑制SufSE活性.
- 过度表达CyaY会损害细胞脱硫酶活性和Fe-S集群组合,特别是在依赖SufS.
结论:
- CyaY在调节大肠杆菌中IscS和SufS的脱硫酶活性方面发挥着生理作用.
- TusA从IscS中取代CyaY,这有助于将硫转移到替代途径.
- 这些发现揭示了硫分布的调节机制,这对于铁硫生物发生和细胞功能至关重要.
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