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一种类型VI分泌系统效应剂TseG的Pantoea ananatis涉及毒性和抗菌活性
Xiaozhen Zhao1, Lu Gao1, Qurban Ali1
1Key Laboratory of Monitoring and Management of Crop Disease and Pest Insects, College of Plant Protection, Nanjing Agricultural University, Ministry of Education, Nanjing, China.
Molecular plant pathology
|March 13, 2024
概括
潘托亚 ananatis 使用其第六类分泌系统1 (T6SS-1) 来输送新型效应剂 TseG. 这种效应因子增强了植物中的毒性,并有助于细菌在对抗大肠杆菌的竞争.
科学领域:
- 微生物学 微生物学
- 细菌病原体的产生
- 分子生物学分子生物学
背景情况:
- 六型分泌系统 (T6SS) 对阴性细菌至关重要,它可以将效应体注入目标细胞.
- 虽然已知T6SS在病原和细菌间竞争中的功能,但许多效应因子仍然未被描述.
- 植物相关的多功能细菌Pantoea ananatis拥有多个T6SS基因集群.
研究的目的:
- 为了研究Pantoea ananatis DZ-12中的T6SS基因集群.
- 识别和描述涉及毒性和竞争的新型T6SS-1分泌效应物.
- 阐明已识别的效应因子的传递机制和功能.
主要方法:
- 对Pantoea ananatis DZ-12进行基因组分析,以确定T6SS基因群.
- 对T6SS-1系统功能进行实验性调查.
- 使用伴侣TecG (DUF2169域) 识别T6SS-1分泌的效应体TseG.
- 测试以确定TseG与伴侣TecG和免疫蛋白TsiG的相互作用.
- 在玉米,马和洋中进行病毒性测试,以及对大肠杆菌的竞争性测试.
主要成果:
- 潘托亚 ananatis DZ-12 含有三个 T6SS 基因集群 (T6SS-1,T6SS-2,T6SS-3),其中 T6SS-1 对病原性和竞争至关重要.
- 发现了一种新型的T6SS-1效应体,TseG,它依赖伴侣TecG进行分泌.
- TseG与TecG进行交付,与TsiG进行自身免疫.
- TseG 在潘托亚中保存,并在多种植物宿主中促进毒性.
- TseG 赋予了对大肠杆菌的竞争优势.
结论:
- 这项研究报告了来自Pantoea ananatis的第一个T6SS-1分泌效应剂TseG.
- TseG在各种植物病理系统中对P. ananatis的毒性起着重要作用.
- 鉴定TseG扩大了对T6SS效应因子多样性和格拉姆阴性细菌功能的理解.
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