来自Bacillus thuringiensis的杀虫剂delta-endotoxin的晶体结构,分辨率为2.5 A
1Medical Research Council Laboratory of Molecular Biology, Cambridge, UK.
Nature
|October 31, 1991
概括
对于甲虫有毒的Bacillus thuringiensis delta-endotoxin的晶体结构显示出一个三域折叠. 这种结构为杀虫剂蛋白的功能和机制提供了洞察力.
科学领域:
- 结构生物学 结构生物学
- 分子生物学分子生物学
- 昆虫毒理学 昆虫毒理学
背景情况:
- 甲杆菌 (Bacillus thuringiensis) 的三角内毒素是具有杀虫功能的蛋白质.
- 特定的毒素针对不同的昆虫类,包括虫 (甲虫).
- 了解分子结构是阐明作用机制的关键.
研究的目的:
- 为了确定来自Bacillus thuringiensis亚种的三角洲内毒素的高分辨率晶体结构. 这是一个黑暗的世界. tenebrionis.
- 描述结构域及其在昆虫毒性的潜在功能.
- 为昆虫杀虫蛋白的一般折叠建立结构基础.
主要方法:
- 在X射线晶体学.
- 在2.5安格斯特罗姆分辨率下进行结构确定.
主要成果:
- 德尔塔-内毒素结构包括三个域:一个七螺旋束,一个三片域和一个β三明治.
- 该分子的核心由保存的细分构成,代表活跃的delta-endotoxins的一般折叠.
- 螺旋束涉及孔隙形成,而三叶域在受体结合中.
结论:
- 确定的结构代表了Bacillus thuringiensis杀虫蛋白的一般折叠.
- 结构特征表明,在杀虫机制中不同领域的特定作用.
- 这为了解和潜在地设计这些毒素提供了基础.
相关概念视频
01:18Production of Biopesticides
Biopesticides offer a sustainable alternative to chemical pesticides, utilizing microbial agents to control agricultural pests. Bacillus thuringiensis (Bt) is a widely employed bacterium known for its potent insecticidal activity. Bt biopesticides are favored for their specificity to insect pests, minimal environmental impact, and natural degradability.Mechanism of Bt Toxin Action Bt produces insecticidal crystal (Cry) proteins during its sporulation phase. These proteins form parasporal...
01:12Bacterial Toxins
Bacterial toxins are sophisticated virulence factors that enable pathogenic bacteria to interact with, invade, and damage host tissues. These toxins fall broadly into two types: protein exotoxins, which are secreted into the environment and target specific host receptors, and lipopolysaccharide endotoxins, which are structural components of the bacterial outer membrane released primarily during bacterial lysis or membrane shedding. Exotoxins generally act more selectively, binding to cell...