侵入性Staphylococcus epidermidis使用一种独特的过程性墙体 - - 铁酸甘转移酶来逃避免疫识别
Yinglan Guo1,2, Xin Du2,3,4, Janes Krusche2,3,4
1Interfaculty Institute of Biochemistry, University of Tübingen, Tübingen, Germany.
Science advances
|November 24, 2023
概括
医疗保健相关的甲素耐药葡萄球菌 (HA-MRSE) 使用TarM(Se) 将葡萄糖添加到利比托酸盐 (RboP) 壁 teichoic 酸 (WTA). 这种修改有助于HA-MRSE逃避免疫检测,促进感染.
科学领域:
- 微生物学 微生物学
- 结构生物学 结构生物学
- 免疫学 免疫学 免疫学
背景情况:
- 葡萄球菌表皮菌,特别是与医疗保健相关的甲素耐药菌株 (HA-MRSE),可以产生利比托酸盐 (RboP) 壁 teichoic 酸 (WTA).
- 这种RboP-WTA类似于黄金葡萄球菌中发现的RboP-WTA,并且与血液感染中HA-MRSE持久性和毒性增加有关.
研究的目的:
- 研究HA-MRSE (TarM(Se)) 中的TarM酶对RboP-WTA的糖化机制.
- 了解Staphylococcus aureus中TarM(Se) 与TarM(Sa) 的区别以及这些差异对免疫逃避的功能意义.
主要方法:
- 确定了TarM(Se) 与UDP-葡萄糖,UDP和糖化聚合物 (RboP) 复合的晶体结构.
- 分析了TarM(Se) 的结合方式和糖化机制.
- 将TarM(Se) 的糖结合与TarM(Sa) 的糖结合比较.
主要成果:
- TarM(Se) 将RboP-WTA与葡萄糖一起糖化,而TarM(Sa) 使用N-乙葡萄糖胺 (GlcNAc).
- 这种RboP-WTA上的葡萄糖修饰会损害人体免疫球蛋白G的检测,可能有助于免疫逃避.
- TarM(Se) 作为一个过程性壁 teichoic 酸葡萄糖转移酶.
结论:
- 通过TarM(Se) 进行的明显的糖化,有助于侵入性Staphylococcus epidermidis的免疫逃避策略.
- 对TarM(Se) 的结构性见解可以指导针对HA-MRSE的向抑制剂,疫苗和菌体疗法的开发.
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