FliH和FliI帮助FlhA在沙门氏菌中严格规范鞭毛蛋白质出口
Miki Kinoshita1, Tohru Minamino2, Takayuki Uchihashi3
1Graduate School of Frontier Biosciences, Osaka University, 1-3 Yamadaoka, Suita, Osaka, 565-0871, Japan.
Communications biology
|March 27, 2024
概括
鞭毛类型III分泌系统 (fT3SS) 使用FlhA蛋白.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- 鞭毛III型分泌系统 (fT3SS) 协调鞭毛组合的蛋白质出口.
- FlhA的C端域 (FlhA_C) 形成了一个环,对基质识别和特异性切换至关重要.
- 众所周知,FlhA_C中保存的GYXLI图案可以诱导动态运动,以实现高效的出口.
研究的目的:
- 调查FlhA_C中保存的GYXLI图案在fT3SS.fT3SS的订购蛋白质出口中的作用.
- 为了确定GYXLI图案是否对于纠正鞭毛组装过程中基质识别错误至关重要.
主要方法:
- 对两个GYXLI突变的分析:flhA(GAAAA) 和flhA(GGGGG).
- 研究GYXLI基因与鞭毛ATPase复合体之间的相互作用.
- 评估GYXLI突变对FlhA_C环结构和基质特异性切换的影响.
主要成果:
- GYXLI图案对于鞭毛ATPase复合体重塑FlhA_C环结构至关重要.
- 在GYXLI基因的突变损害了fT3SS的转换基质特异性的能力.
- 有证据表明,GYXLI图案与ATPase复合物一起,可以在组装过程中纠正基质识别错误.
结论:
- 在FlhA_C中的GYXLI图案对于fT3SS中高效的基质特异性切换和错误纠正至关重要.
- 鞭毛ATPase复合体在重塑FlhA_C和通过GYXLI动机确保精确的蛋白质出口方面发挥着双重作用.
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