通过利用互补的防御系统来加强Streptococcus thermophilus的菌体耐药性
Audrey Leprince1, Justine Lefrançois2, Anne M Millen3
1Département de biochimie, de microbiologie et de bio-informatique, Faculté des sciences et de génie, Université Laval, Québec City, QC, Canada. Institut de Biologie Intégrative et des Systèmes (IBIS), Pavillon Charles-Eugène-Marchand, Université Laval, Québec City, QC, Canada. audrey.leprince.1@ulaval.ca.
Nature communications
|August 4, 2025
概括
热杆菌 (Streptococcus thermophilus) 使用CRISPR-Cas和其他对菌体的防御系统. 研究人员确定了21种辅助抗菌体系统,增强了细菌的耐药性,特别是对具有抗CRISPR蛋白 (ACRs) 的菌体.
科学领域:
- 微生物学 微生物学
- 细菌学 细菌学是一门学科.
- 病毒学 病毒学
背景情况:
- 热杆菌 (Streptococcus thermophilus) 依赖于CRISPR-Cas和限制修饰系统进行菌体防御.
- 菌体使用抗CRISPR蛋白 (ACR) 和其他策略来逃避细菌免疫.
- 在S. thermophilus中,抗菌素系统的全谱仍然不完全理解.
研究的目的:
- 为了全面调查Streptococcus thermophilus中的辅助抗菌素防御系统.
- 识别超越CRISPR-Cas和限制修改系统的新型防御机制.
- 评估这些系统对各种菌体的有效性和潜在协同作用.
主要方法:
- 对263个S. thermophilus菌株的防御体进行生物信息分析.
- 使用14种不同的菌体对17种已识别的辅助防御系统进行实验验证.
- 评估与这些系统的染色体整合相关的健康成本.
主要成果:
- 在S. thermophilus中发现了21种辅助抗菌体系统,其中13种在此物种中以前未被描述.
- 证明了17个系统对五种病毒属的多样化的抗菌体活动,显示了广泛和狭窄的特异性.
- 在将CRISPR免疫与辅助防御系统相结合时观察到协同效应.
- 在实验室和工业条件下,没有发现集成附件系统的显著适应性成本.
结论:
- 辅助防御系统显著扩大了Streptococcus thermophilus的抗菌素谱.
- 这些系统提供了增强细菌耐药性的有希望的策略,特别是针对编码抗CRISPR蛋白 (ACRs) 的菌体.
- 缺乏适应性成本表明,改善工业菌株的实际适用性.
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