在格拉姆阴性和格拉姆阳性细菌中进行局部特定O-sialylation的平行多元组件系统的演变
Jovelyn Unay1, Nicolas Kint2, Patrick H Viollier1
1Department of Microbiology & Molecular Medicine and Geneva Center for Inflammation Research (GCIR), Faculty of Medicine, University of Geneva, 1211 Geneva, Switzerland.
Current biology : CB
|June 19, 2024
概括
研究人员确定了细菌鞭叶糖化过程的独特机制. 在Shewanella oneidensis MR-1中,两个Maf酶表现出不同的特异性,其中一个需要一个新的因子,GlfM,用于伪氨基酸 (Pse) 附着.
科学领域:
- 微生物学 微生物学
- 生物化学 生物化学
- 分子生物学分子生物学
背景情况:
- 细菌通常使用糖类如伪氨基酸 (Pse) 来糖化鞭毛素,这是运动性结构的关键组成部分.
- 保存的Maf类型的鞭甘转移酶 (fGT) 参与了这一过程,但其活性,特别是Pse-依赖性化,可能需要额外的组件.
研究的目的:
- 为了描述Shewanella oneidensis MR-1中的两个Maf类型.
- 在异质宿主中复制Pse-依赖的糖化.
- 阐明Maf介导的旗素O-糖基化过程的独特机制和特异性.
主要方法:
- 在Shewanella oneidensis MR-1中对Maf对应物进行表征.
- 在异种细菌宿主中复制Pse-依赖的糖化.
- 分析蛋白质与蛋白质相互作用和域功能 (例如,TPR域,GlfM).
主要成果:
- 两种Maf类型均表现出不同的鞭毛素受体决定因素和标特异性.
- Maf-1利用其C端四基重复 (TPR) 域进行特异性.
- Maf-2需要一个新的特异性因子,Maf (GlfM) 的糖化因子,以与鞭毛素形成一个功能三元复合体.
- GlfM与Maf-2共同编码,需要一个不变的阿斯巴酸盐来起作用.
结论:
- fGTs的融合进化导致了不同的鞭毛蛋白结合策略 (双边与三边系统).
- 这些不同的系统导致接受者血清残留的O-糖化偏好变化,其中Pse.
- 发现GlfM扩大了我们对控制细菌鞭毛蛋白修饰的分子机制的理解.
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