Inhibitory effects of nitrite and sulfite/peroxymonosulfate on bacteria are mediated respectively through respiration and intracellular GSH homeostasis

IF 6.1 1区 生物学 Q1 MICROBIOLOGY Microbiological research Pub Date : 2024-10-31 DOI:10.1016/j.micres.2024.127962
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Abstract

As nitrite, sulfite has been used in food preservation for centuries but how it inhibits bacterial growth remains underexplored. To address this issue, in this study, we set out to test if cytochrome (cyt) c proteins protect bacteria from the damage of certain reactive sulfur species (RSS) because they do so in the case of reactive nitrogen species (RNS). We show that some reactive sulfur species, such as sulfite and peroxymonosulfate (PMS), inhibit growth of bacterial strains devoid of cytochrome (cyt) c proteins. Subsequent investigations link the inhibition of sulfite/PMS to activity of cbb3-type heme-copper oxidase (cbb3-HCO). However, in vitro comparative analysis rules out that either cbb3-HCO or cyt bd oxidase is the primary target of sulfite/PMS. Instead, we found that sulfite/PMS and the cbb3-HCO loss regulate intracellular redox status in a similar manner, by affecting GSH/GSSG homeostasis. The link between the GSH/GSSG homeostasis and sulfite/PMS is further substantiated by using the mutants with enhanced GSSG generation. Furthermore, we present the data to show that inhibitory effects of nitrite and sulfite/PMS are additive although the overall effects may vary depending on species. Our results open an avenue to control bacteria by developing more robust agents that modulating intracellular redox status, which may be used in combination with nitrite as a promising antimicrobial strategy.
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亚硝酸盐和亚硫酸盐/过氧单硫酸盐对细菌的抑制作用分别通过呼吸作用和细胞内 GSH 平衡来介导。
作为亚硝酸盐,亚硫酸盐在食品保鲜中的应用已有数百年历史,但它是如何抑制细菌生长的仍未得到充分研究。为了解决这个问题,在本研究中,我们着手测试细胞色素(cyt)c 蛋白是否能保护细菌免受某些活性硫物种(RSS)的损害,因为它们在活性氮物种(RNS)的情况下也能做到这一点。我们的研究表明,亚硫酸盐和过氧化单硫酸盐(PMS)等某些活性硫会抑制不含细胞色素(cyt)c 蛋白的细菌菌株的生长。随后的研究将亚硫酸盐/PMS 的抑制作用与 cbb3 型血红素铜氧化酶(cbb3-HCO)的活性联系起来。然而,体外比较分析排除了 cbb3-HCO 或细胞 bd 氧化酶是亚硫酸盐/PMS 的主要靶标的可能性。相反,我们发现亚硫酸盐/PMS 和 cbb3-HCO 损失通过影响 GSH/GSSG 平衡,以类似的方式调节细胞内氧化还原状态。通过使用 GSSG 生成增强的突变体,我们进一步证实了 GSH/GSSG 平衡与亚硫酸盐/PMS 之间的联系。此外,我们提供的数据表明,亚硝酸盐和亚硫酸盐/PMS 的抑制作用是相加的,但总体效果可能因物种而异。我们的研究结果为通过开发能调节细胞内氧化还原状态的更强效制剂来控制细菌开辟了一条途径,这种制剂可与亚硝酸盐结合使用,作为一种很有前景的抗菌策略。
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来源期刊
Microbiological research
Microbiological research 生物-微生物学
CiteScore
10.90
自引率
6.00%
发文量
249
审稿时长
29 days
期刊介绍: Microbiological Research is devoted to publishing reports on prokaryotic and eukaryotic microorganisms such as yeasts, fungi, bacteria, archaea, and protozoa. Research on interactions between pathogenic microorganisms and their environment or hosts are also covered.
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