在Streptococcus pneumoniae中,取决于碳源的囊厚度调节
Joel P Werren1,2, Nadja Mostacci1, Ilche Gjuroski3
1Institute for Infectious Diseases, Faculty of Medicine, University of Bern, Bern, Switzerland.
Frontiers in cellular and infection microbiology
|December 14, 2023
概括
肺炎链球菌的生长和囊生产因碳来源而异. 曼诺和N-乙葡萄糖胺 (GlcNAc) 减少了囊大小和改变了基因表达,影响了粘附潜力.
科学领域:
- 微生物学 微生物学
- 细菌病原体的产生
- 分子生物学分子生物学
背景情况:
- 肺炎链球菌的多糖囊对于毒性,粘附性和生存至关重要.
- 不同的碳来源,如银河糖,曼和N-乙葡萄糖胺 (GlcNAc) 在特定的人类中代谢 (鼻与血液).
- 了解碳源对肺炎球菌生长,囊生物合成和粘附的影响至关重要.
研究的目的:
- 研究各种碳来源对Streptococcus pneumoniae生长的影响.
- 分析碳来源对肺炎球菌囊生物合成和厚度的影响.
- 确定碳来源如何影响S. pneumoniae. 的粘附潜力.
主要方法:
- 培养的野生类型和囊淘汰S. pneumoniae菌株具有不同的碳来源 (银糖,GlcNAc,曼诺糖,葡萄糖).
- 使用FITC-dextran排除试验测量囊厚度.
- 通过31P-NMR量化囊前体 (UDP-葡萄糖,UDP-银糖) 和评估上皮粘附.
- 在临床分离物上进行了转录组分析 (RNA测序).
主要成果:
- 与葡萄糖相比,银河糖,曼诺糖和GlcNAc的增长减少了.
- 囊大小减少了曼诺和GlcNAc.
- 减少了UDP-葡萄糖和UDP-银糖前体的积累,观察到曼诺和GlcNAc.
- 当在曼诺斯与葡萄糖中生长时,观察到上皮质粘附度增加.
- 转录组分析揭示了菌株特异性和常见的碳源特异性基因表达模式.
结论:
- S. pneumoniae表现出基于不同人体中可用的单糖的适应性生活方式策略.
- 碳源的可用性显著影响肺炎球菌囊形成和粘附能力.
- 基因表达是由碳来源调节的,这有助于利基适应.
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