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SPD_0410 负面调节囊多糖化合物合成和毒性在Streptococcus pneumoniae D39 中

Ye Tao¹, Li Lei¹, Shuhui Wang²

¹Department of Clinical Laboratory, Children's Hospital of Chongqing Medical University, National Clinical Research Center for Child Health and Disorders, Ministry of Education Key Laboratory of Child Development and Disorders and Chongqing Key Laboratory of Pediatric Metabolism and Inflammatory Diseases, Chongqing, China.

Frontiers in microbiology

|January 20, 2025

概括

一种假设的蛋白质,SPD_0410,在Streptococcus pneumoniae中起到囊多糖 (CPS) 合成的负调节作用. 删除 SPD_0410 增加了细菌的毒性和对细胞的抵抗力.

科学领域:

微生物学微生物学
分子生物学分子生物学
细菌病原体的产生

背景情况:

肺炎 estreptococcus 的囊多糖 (CPS) 是一个关键的毒性因素.
CPS合成部分通过转录进行调节.

研究的目的:

为了确定Streptococcus pneumoniae囊多糖化物 (CPS) 位的调节者.
调查假设蛋白质SPD_0410在CPS调节和细菌毒性中的作用.

主要方法:

电泳运动转移测试 (EMSA) 和DNA酶足迹测试,以确定蛋白质-DNA相互作用.
构建和分析D39Δspd0410突变菌株.
RNA测序 (RNAseq) 用于分析基因表达变化.
在体外细菌入侵和细胞耐药性测试.
系统性感染的体内小鼠模型.

主要成果:

SPD_0410被确定为cps位点的直接负调节器,与cps促进器上的特定位点结合.
D39Δspd0410突变体表现出明显升高的CPS水平,增加了细菌入侵,并增强了对细胞酶的抵抗力.
删除spd0410改变了葡萄糖代谢,这似乎影响了SPD_0410对CPS合成的调节功能.
在体内研究表明,D39Δspd0410突变与父菌株相比,在小鼠中引起更严重的疾病.

结论:

SPD_0410 负面调节了Streptococcus pneumoniae囊的合成.
SPD_0410通过调节CPS生产,直接影响肺炎球菌的毒性.
SPD_0410是治疗肺炎球菌感染的潜在目标.

关键词:

肺炎链球菌的肺炎链球菌.囊状的多糖化物.碳水化合物代谢的代谢转录规则转录规则转录规则毒性毒性是一种毒性.

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