细胞壁分类信号残余的定位及其与传感器激酶的相互作用
Jeffrey W Hall1, Bruno P Lima1, Karen F Johnstone1
1Department of Diagnostic and Biological Sciences, Division of Basic Sciences, School of Dentistry, University of Minnesota, Minneapolis, MN, USA.
Methods in molecular biology (Clifton, N.J.)
|October 10, 2023
概括
格拉姆阳性细菌的一种新型信号通路涉及细胞壁蛋白片段 (C-pep) 与膜蛋白 (SraS) 相互作用,以调节基因表达,揭示索尔塔酶A的处理忠实度.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 索尔塔酶是必要的格拉姆阳性细菌酶,参与表面蛋白质的细胞壁定.
- 排列酶A特别分裂含有LPXTG动机的蛋白质,促进它们与二醇糖的共价交联.
- 细胞膜内的索尔塔酶加工的功能在很大程度上仍未被探索.
研究的目的:
- 为了研究一种由附着素SspA.衍生出的分类酶A分裂 (C-pep) 的体内功能.
- 为了阐明C-pep与膜内传感器胺激酶 SraS. SraS. 之间的相互作用.
- 了解SraSR两组件系统在信号分类处理忠实性和宿主-病原体相互作用中的作用.
主要方法:
- 使用结构化照明显微镜 (SIM) 在体内可视化细菌细胞膜内的C-pep间隔.
- 使用分裂黄色光蛋白 (YFP) 的双分子光补充试验被用来证明C-pep和SraS复合体的形成.
- 这项研究的重点是链球菌细胞膜动力学和蛋白质-蛋白质相互作用.
主要成果:
- 观察到SspA的C终端 (C-pep) 插入细胞膜.
- 已经证明,C-pep与细胞膜内的 SraS 传感器基因酶直接相互作用.
- 这种相互作用激活SraR反应调节器,信号排序酶A处理事件并影响转录反应.
结论:
- 在细菌细胞膜内,C-pep充当信号分子,调解细胞壁处理和细胞内调节通路之间的通信.
- SraSR系统提供了一种机制来监测A类活动,并可能适应宿主环境.
- 这项研究揭示了一种新的膜内信号级联,对细菌细胞包膜恒温和毒性至关重要.
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