来自植物病原菌Xanthomonas euvesicatoria的VirB/VirD4和ICM/Dot IV型分泌系统的功能性表征
Sabine Drehkopf1, Felix Scheibner1, Daniela Büttner1
1Institute for Biology, Department of Genetics, Martin-Luther University Halle-Wittenberg, Halle (Saale), Germany.
Frontiers in cellular and infection microbiology
|August 18, 2023
概括
植物Xanthomonas euvesicatoria具有两种IV型分泌 (T4S) 系统,即VirB/VirD4和ICM/Dot,它们是功能性的,但对植物相互作用并不重要. 这些系统促进了等离子体转移和基质向,尽管涉及新的机制.
科学领域:
- 微生物学 微生物学
- 植物病理学 植物病理学
- 细菌遗传学 细菌遗传学
背景情况:
- 格拉姆阴性细菌利用IV型分泌 (T4S) 系统进行细胞间传输.
- T4S系统分为最小化 (VirB/VirD4) 或扩展 (Icm/Dot) 的类别.
- 克桑托莫纳斯 (Xanthomonas euvesicatoria) 是独特的,它拥有两种T4S系统类型,并在胡和番茄中引起细菌斑点疾病.
研究的目的:
- 为了研究VirB/VirD4和ICM/Dot T4S系统在Xanthomonas euvesicatoria中的表达和功能.
- 确定这些T4S系统在宿主植物相互作用和细菌结合中的作用.
- 识别基板,并了解T4S系统在X. euvesicatoria中的准机制.
主要方法:
- 对T4S组件的基因表达分析.
- 寡头复杂组合的评估.
- 对于宿主相互作用和细菌溶解的功能测试.
- 等离子体转移实验.
- 基质鉴定和与T4S合蛋白的相互作用研究.
主要成果:
- 这两种T4S系统都表达并形成功能复合体.
- 对于宿主植物相互作用和细菌溶解,T4S系统是不可缺少的.
- 塑局部化的VirB/VirD4系统是功能性的,并调解塑转移.
- 放松酶TraI被确定为T4S基质.
- 候选基质与VirD4相互作用,但C端结合点对T4S不足,这表明了新的向机制.
结论:
- 克桑托蒙纳斯水区 (Xanthomonas euvesicatoria) 拥有两个截然不同的功能性T4S系统.
- 这些T4S系统在等离子体转移中起作用,而不是这种病原体的毒性.
- 针对两种T4S系统的基质向涉及已知VirD4结合部位之外的机制.
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