聚亚丁酶PAPI是需要在致病性细菌中维护毒性等离子体的
Katherine Schubert1, Jessica Zhang2,3, Michele E Muscolo4,5
1Department of Molecular, Cell, and Developmental Biology, UC Santa Cruz, Santa Cruz, California, United States of America.
PLoS pathogens
|May 27, 2025
概括
染色体基因pcnB,编码多基酶PAP I,对于维持Yersinia和Shigella病原体中的毒性质粒至关重要. 这种基因稳定了等离子体,增强了抗生素耐药性,并增强了细菌的毒性.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
背景情况:
- 病原性细菌利用等离子体编码的毒性因子来感染,它们的表达通常与等离子体的复制和副本数量有关.
- 类型III分泌系统 (T3SS) 对于Yersinia毒性至关重要,编码在pYV毒性等离子体上,其表达受到温度和基因剂量的调节.
- 控制高等离子体拷贝数和在宿主温度下的稳定性的机制尚不清楚.
研究的目的:
- 调查染色体基因pcnB的作用,编码多基酶PAP I,在调节致病性等离子体的复制和稳定性在致病性细菌.
- 确定pcnB/PAP I对T3SS表达,细菌毒性和抗菌耐药性 (AMR) 质体的维持的影响.
- 探索pcnB/PAP I在细菌病原体中病毒性和AMR等离子体的传播和稳定方面的更广泛影响.
主要方法:
- 研究了pcnB基因及其编码的PAP I酶在Yersinia和Shigella物种中的功能.
- 评估了pcnB/PAP I对pYV等离子体拷贝数 (PCN) 和在不同温度下的稳定性的影响.
- 评估了pcnB/PAP I对T3SS基因表达的影响,小鼠模型中的细菌毒性,以及抗菌素耐药性等离子体的维持.
主要成果:
- 染色体基因pcnB/PAP I对于调节pYV等离子体拷贝数,维持pYV稳定性,强大的T3SS活性和Yersinia毒性至关重要.
- 对于Shigella flexneri中强大的T3SS表达和维持抗菌素耐药性等离子体,增加抗生素耐药性的十倍,pcnB/PAP I也是必需的.
- pcnB/PAP I促进了细菌病原体中sRNA调节的毒性和AMR等离子体的传播和稳定.
结论:
- 这种pcnB/PAP I酶在稳定病原细菌如Yersinia和Shigella的毒性和抗菌耐药性等质体中起着至关重要的作用.
- 这种稳定直接影响细菌的毒性和抗生素耐药性,通过确保等离子体编码特征的适当基因剂量.
- 在细菌物种中广泛识别pcnB/PAP I表明它在细菌病原和耐药性基因的传播中起着重要的,但被低估的作用.
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