Gliotoxin介导的细菌生长抑制是由特定的金属离子耗尽引起的
Shane G Downes1, Rebecca A Owens1, Kieran Walshe2
1Department of Biology, Maynooth University, Co. Kildare, Ireland.
Scientific reports
|September 27, 2023
概括
菌类代谢物gliotoxin (GT) 通过耗尽细胞内来抑制细菌生长. 添加或铜可以逆转这种效应,揭示了打击抗菌素耐药性的新机制.
科学领域:
- 微生物学 微生物学
- 生物化学 生化学
- 药物发现 药物发现 药物发现
背景情况:
- 抗微生物药物耐药性是全球主要的健康挑战.
- 菌代谢物,如质毒素 (GT),显示出新的抗菌策略的潜力.
- 对于GT的抗菌活性,其精确的机制在很大程度上是未知的.
研究的目的:
- 阐明通过质毒素 (GT) 抑制细菌生长的机制.
- 研究金属离子,特别是 (Zn2+) 和铜 (Cu2+) 在GT抗菌作用中的作用.
- 分析GT对细菌蛋白质组的影响.
主要方法:
- 使用GT和金属离子 (Zn2+,Cu2+) 的细菌生长抑制试验.
- 在体外金属化试验中测定减少的质毒素 (DTG).
- 高分辨率质谱测量以确认金属-GT合物.
- 对暴露于GT的*Enterococcus faecalis*进行无标签的定量蛋白质组分析.
主要成果:
- 通过添加 Zn 2+ 或 Cu 2+ 来逆转GT介导的细菌生长抑制.
- 证实DTG可以化Zn2+,Cu2+和Fe3+,形成稳定的复合物.
- 蛋白质组分析显示,在GT暴露后,E. faecalis的蛋白质表达发生了显著变化,包括改变的吸收系统.
- GT与万科胺素对*E. faecalis*产生协同作用,这种作用也被逆转.
结论:
- GT介导的细菌生长抑制可能涉及细胞内耗尽或生物可用性降低.
- 铜恒温也可能被GT调节.
- GT对细菌蛋白质组的影响,特别是与相关的通路,为其抗菌作用提供了新的见解.
- 这些发现表明,潜在的治疗策略是针对细菌中的金属离子稳态.
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