通过Bacillus thuringiensis产生的杀虫孔形成毒素在膜插入时发生的结构变化
Sabino Pacheco1, Isabel Gómez1, Angel E Peláez-Aguilar1
1Departamento de Microbiología Molecular, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Cuernavaca, Morelos, Mexico.
Frontiers in insect science
|March 12, 2024
概括
甲杆菌 (Bt) 形成毛孔的毒素 (PFTs),包括Cry和Vip蛋白,对于昆虫害虫控制至关重要. 本综述详细介绍了它们的膜插入机制和毛孔形成,这对于杀虫活性至关重要.
科学领域:
- 微生物学 微生物学
- 生物化学 生物化学
- 结构生物学 结构生物学
背景情况:
- 硫杆菌 (Bt) 产生各种各样的孔形成毒素 (PFT),用于杀虫害虫害.
- 晶体 (Cry) 蛋白质是广泛使用的Bt毒素,但它们的孔隙结构仍然不完全理解.
- 了解Bt毒素机制对于提高疗效和管理昆虫耐药性至关重要.
研究的目的:
- 审查Cry毒素膜插入的拟议模型.
- 总结了最近在膜插入状态下对植物性杀虫蛋白 (Vips) 和杀虫毒素复合物 (Tcs) 的结构发现.
- 要突出在膜孔形成过程中Bt PFTs中常见的结构重组.
主要方法:
- 对Bt PFTs现有研究的文献综述.
- 对嵌入膜的Vips和Tcs.结构数据的分析.
- 各种Bt PFT之间的结构相似性和差异的比较.
主要成果:
- 讨论了Cry毒素膜插入的模型.
- 介绍了嵌入膜的Vips和Tcs的最新结构.
- 尽管有序列变异,但Vips和Cry蛋白具有结构上的相似性.
- 所有审查的PFT都经历了显著的结构变化,形成了膜孔.
结论:
- 包括Cry,Vip和Tc蛋白在内的Bt PFT经历了重大的结构重组,形成孔隙.
- 一个常见的机制涉及扩展α螺旋体的形成,这对于膜穿孔和杀虫活性至关重要.
- 对Bt PFT的进一步结构洞察将有助于制定更有效的害虫控制策略.
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