一种性转糖酶将细菌的焦点粘附复合体与糖蛋白细胞壁连接起来
Carlos A Ramírez Carbó1,2,3, Olalekan G Faromiki1,3, Beiyan Nan1
1Department of Biology, Texas A&M University, College Station, TX 77843, USA.
bioRxiv : the preprint server for biology
|April 15, 2024
概括
Myxococcus xanthus使用AgmT将滑翔电机与糖细胞壁连接起来. 这种连接对于机械力传递和细菌滑动的运动性至关重要.
科学领域:
- 微生物学 微生物学
- 细胞生物学 细胞生物学
- 生物物理学的生物物理.
背景情况:
- Myxococcus xanthus是一种以其在表面上滑动的运动性而闻名的グラム阴性细菌.
- 滑翔涉及动态细菌聚焦粘附复合体 (bFACs),将质子动力转化为机械推进.
- 通过刚性甘 (PG) 细胞壁传递力的机制仍然不太清楚.
研究的目的:
- 调查糖 (PG) 转糖酶在调解细菌焦点粘附复合体 (bFAC) 与细胞壁之间的连接中的作用.
- 阐明一种机制,通过该机制将机械力传递到PG层,以实现细菌滑动的运动.
主要方法:
- 共同沉试验被用来确定蛋白质相互作用.
- 使用单粒子显微镜可视化bFACs的组装和功能.
- 在Myxococcus xanthus.hus中进行了包括异质基因表达在内的基因操纵.
主要成果:
- AgmT,一种性PG转糖酶,被确定为一个关键的蛋白质,将bFAC与PG合起来.
- 在没有活性AgmT的情况下,bFACs无法与PG连接,损害了滑翔运动.
- 大肠杆菌的异质表达 MltG 挽救了 AgmT 缺乏细胞中的 bFAC-PG 连接和滑动性.
结论:
- AgmT充当一个关键的,将bFAC连接到AgmT修饰的PG.
- 这种定机制对于在PG细胞壁上传递机械力至关重要,使Myxococcus xanthus. 的滑动性成为可能.
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