与新陈代谢相关的甲基毒素传感器负责Methylobacterium aquaticum22A菌株的植物殖民
Akio Tani1, Sachiko Masuda1,2, Yoshiko Fujitani1
1Institute of Plant Science and Resources, Okayama University, Kurashiki, Japan.
Frontiers in microbiology
|October 30, 2023
概括
科学家在Methylobacterium aquaticum中发现了三个关键传感器 (MtpA,MtpB,MtpC),它们负责甲醇出租车,对植物殖民至关重要. 这种甲基毒性使细菌能够有效地殖民植物,支持植物健康.
科学领域:
- 微生物生态学 微生物生态学
- 植物与微生物的相互作用
- 细菌化学反应 (Bacterial Chemotaxis) 是一种
背景情况:
- 移动细菌在植入植物表面时获得竞争优势,建立有利的关联,促进植物健康.
- 植物排泄物作为细菌的生长基质和化学毒素吸引剂.
- 虽然已知许多植物性化合物及其化学反应传感器,但细菌中的甲醇传感器仍然未被确定.
研究的目的:
- 在促进植物生长的细菌Methylobacterium aquaticum菌株22A中识别负责甲醇化学毒性 (甲基毒性) 的特定传感器.
- 阐明这些传感器调解甲基毒性作用并影响细菌植入植物表面的机制.
- 了解甲醇新陈代谢相关的化学反应在启动植物-甲基杆菌共生中的作用.
主要方法:
- 基因组分析以识别甲基接受化学反应蛋白 (MCP).
- 为已识别的MCP (MtpA,MtpB,MtpC) 和甲醇脱酶 (MDHs:MxaFI,XoxF) 构建多个基因淘汰.
- 在野生型和突变菌株中评估细菌化学反应,细胞局部化,基因表达和植物殖民效率.
主要成果:
- 三个MCP (MtpA,MtpB,MtpC) 被确定为负责M. aquaticum 22A.中的甲基毒性.
- 缺乏这些MCP的三重突变体没有甲基毒性,对植物组织的吸引力降低,植物殖民效率较低.
- MtpA感知到甲,MtpB的活性取决于胺调节的XoxF MDHs和La3+诱导,MtpC需要MxaFI活动.
结论:
- 在M. aquaticum中,甲醇出租车由三个不同的MCP介导,整合了甲醇氧化途径的信号.
- 两个传感器监测着化物调节的甲醇脱酶,而一个传感器则检测出一种常见的氧化产物甲化物.
- 与甲醇代谢相关的化学反应是Methylobacterium物种有效殖民植物的关键因素,启动有益的共生.
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