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基于增强Vip3A分泌的新策略来提高Bacillus thuringiensis超的毒性
Yizhuo Zhang1, Ziqi Wang1, Cheng Qian1
1Department of Microbiology, College of Life Sciences, Nankai University, Tianjin 300071, China.
Pesticide biochemistry and physiology
|July 31, 2025
概括
增强Bacillus thuringiensis中植物性杀虫蛋白 (Vip3) 的分泌包括操纵细胞壁水解酶 (CWHs). 过度表达像MltE这样的特定CWH会显著增加Vip3分泌和杀虫活性.
科学领域:
- 微生物学 微生物学
- 生物化学 生化学
- 分子生物学分子生物学
背景情况:
- 植物杀虫蛋白 (Vip3) 对于控制虫害至关重要,但其从Bacillus thuringiensis分泌的效率低下.
- 目前的Vip3A表达策略产生高的细胞内水平,具有有限的细胞外分泌.
- 了解Vip3A分泌机制对于提高其疗效至关重要.
研究的目的:
- 研究细胞壁水解酶 (CWHs) 在调节Bacillus thuringiensis中的Vip3A分泌中的作用.
- 确定可以增强Vip3A分泌和整体杀虫活性的特定CWH.
- 探索CWHs对细菌膜囊泡 (MV) 形成和释放的影响.
主要方法:
- 分析不同CWHs (MltE,BioL,EnvC) 的过度表达对Vip3A分泌水平的影响.
- 在工程菌株中量化Vip3A,其他分泌的蛋白质和膜囊泡的产生.
- 评估来自改性菌株的发酵的杀虫活性.
主要成果:
- 丰富的MltE和BioL表达 (作用于糖键) 显著增加了Vip3A的分泌.
- 过度表达EnvC (作用于胺键) 减少了Vip3A的分泌.
- MltE过度表达增强了MV的产生和其他蛋白质的分泌,导致12小时内产生强大的杀虫活性.
结论:
- 细胞壁水解酶在控制细菌MV形成和释放方面发挥合作作用.
- 通过CWH操纵破坏细胞壁稳态可以导致大量的MV释放,增强Vip3A分泌.
- 这些发现为改善Vip3A生产和分泌其他MV相关蛋白质的新策略提供了新的机会.
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