在大肠中识别降解素的初始体
Youxian Li1,2,3, Eiichiro Watanabe1,2,4, Yusuke Kawashima1,5
1RIKEN Center for Integrative Medical Sciences, Yokohama, Japan.
Nature
|September 7, 2022
概括
某些肠道细菌降解素, 这是一种与肠道疾病有关的蛋白酶. 这种细菌作用促进了肠道健康,并防止病毒感染和病原体入侵.
科学领域:
- 微生物学
- 胃肠病学
- 免疫学
背景情况:
- 肠道中蛋白质酶水平升高与疾病有关.
- 调节肠道光蛋白酶的具体机制和微生物参与者在很大程度上是未知的.
研究的目的:
- 鉴定肠道膜中参与素调节的微生物.
- 阐明肠道共生物调节素活性的机制.
- 调查素降解性食源对肠道病原体和感染的保护作用.
主要方法:
- 从人类便样本中分离和鉴定Paraprevotella菌株.
- 使用细菌表面蛋白质分析和第九类分泌系统研究对素降解机制的研究.
- 对IgA稳定性,口服疫苗对Citrobacter rodentium的有效性以及对小鼠肝炎病毒-2感染的易感性进行评估.
- 与SARS-CoV-2感染严重程度有关的肠道微生物组基因的相关性分析.
主要成果:
- 鉴定出Paraprevotella菌株是强大的素降解者.
- 通过IX型分泌系统依赖的多糖定蛋白来招募素到其表面,促进素自分解.
- 用Paraprevotella殖民保护IgA免受降解,并提高了口服疫苗的有效性.
- 菌殖民抑制了致命的小鼠肝炎病毒-2 感染.
- 肠道微生物组基因与SARS-CoV-2患者的腹严重程度降低相关.
结论:
- 降解素的开始性细菌,如Paraprevotella,在维持肠道平衡中起着重要作用.
- 这些共生物提供对依赖宿主蛋白酶的病毒感染的保护,并增强口服疫苗的疗效.
- 针对肠道微生物群中的素降解途径可能为肠道疾病和感染提供治疗策略.
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