具有发达的CRISPR-Cas系统的Pediococcus inopinatus在长期发酵的金中占主导地位,Mukeunji
So Yeong Mun1, Wooje Lee2, Soo-Young Lee3
1Research and Development Division, World Institute of Kimchi, 86 Kimchi-ro, Nam-gu, Gwangju, 61755, South Korea; Department of Food and Nutrition, Chosun University, 309 Pilmun-daero, Dong-gu, Gwangju, 61452, South Korea.
Food microbiology
|November 2, 2023
概括
由于其强大的CRISPR-Cas防御系统,Pediococcus inopinatus在长时间发酵的金中占主导地位. 这项研究揭示了这种微生物防御机制如何驱动乳酸细菌 (LAB) 在金发酵中的继承.
科学领域:
- 微生物学 微生物学
- 食品科学 食品科学 食品科学
- 基因组学就是基因组学.
背景情况:
- 金发酵涉及到一个复杂的,异构的微生物群体.
- 乳酸细菌 (LAB) 继承发生在金发酵过程中,随着时间的推移出现了主导物种.
- 长期发酵的金Mukeunji代表了这一过程的最后阶段.
研究的目的:
- 为了确定长期发酵金 (Mukeunji) 中的主导LAB.
- 调查特定LAB物种占主导地位的遗传基础.
- 为了阐明金发酵中的微生物继承机制.
主要方法:
- 对于LAB隔离和识别的文化依赖和独立分析.
- 分析元基因组以评估微生物群落的组成.
- 全基因组 de novo组装和对主导LAB进行比较基因组分析.
- 对CRISPR-Cas系统组件的基因表达分析.
主要成果:
- 在长期发酵的金奇中,Pediococcus inopinatus被确定为占主导地位的LAB物种.
- P. inopinatus 具有高度发达的聚类定期间隔的短平行体重复 (CRISPR) 系统,包括csa3基因的额外副本.
- 在P. inopinatus.中观察到cas1和cas2基因的高表达和多样化,活跃表达的间隔器.
- 强大的CRISPR-Cas系统被认为是使P. inopinatus占主导地位的关键因素.
结论:
- 一个发达的CRISPR-Cas系统使P. inopinatus在长期发酵的金奇的恶劣环境中获得了竞争优势.
- 该研究提出了kimchi中LAB继承的模型,强调了微生物防御系统的作用.
- 了解这些机制可以为控制金发酵和微生物社区动态的策略提供信息.
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