在Streptococcus sanguinis中发现了一种新的传染性内心炎毒性因子,与血液中的细菌存活相关的多个功能
Vysakh Anandan1, Liang Bao1, Zan Zhu1
1The Philips Institute for Oral Health Research, School of Dentistry, Virginia Commonwealth University, Richmond, VA.
bioRxiv : the preprint server for biology
|July 15, 2024
概括
一种假设的蛋白质SSA_0451对于S. sanguinis感染性内心炎的毒性至关重要. 它的缺失降低了对抗氧化应激的细菌生存率,这表明SSA_0451是药物点.
科学领域:
- 微生物学 微生物学
- 传染性疾病 传染性疾病
- 分子生物学分子生物学
背景情况:
- 传染性内心炎 (IE) 是一种严重的感染,通常是由Streptococcus sanguinis等细菌引起的.
- 了解细菌毒性因素是开发IE有效治疗的关键.
研究的目的:
- 研究保存的假设蛋白质SSA_0451在感染性内心炎期间S. sanguinis*毒性的作用.
- 阐明SSA_0451对细菌生存和致病性有所贡献的机制.
主要方法:
- 一种SSA_0451突变 (ΔSSA_0451) 和其补充菌株 (ΔSSA_0451C) 的构建和表征.
- 在体外全血杀死试验测试以评估细菌存活率.
- 在体内子内心炎模型来评估毒性.
- 基因表达分析专注于氧化和环境应激反应基因.
主要成果:
- 与野生型和补充菌株相比,DSSA_0451突变在体外和体内模型中显著降低了毒性.
- 在ΔSSA_0451突变体中观察到参与氧化应激反应的基因的下调.
- 血液中的细菌存活能力受损与压力存活基因的表达减少有关.
结论:
- SSA_0451被确定为感染性内心炎中*S. sanguinis*的新型毒性因子.
- 蛋白质在对抗氧化和环境压力的作用对于细菌的生存和IE病原性至关重要.
- SSA_0451代表了针对传染性内心炎的抗微生物药物发现的潜在新目标.
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