对Sf-SR-C MAM域和Sf-FGFR Ectodomain到Vip3Aa的绑定分析
Chenghai Wang1, Min Li2, Xiling Chen2
1School of Biomedical Sciences, Hunan University, Changsha 410082, China.
Insects
|June 26, 2024
概括
细菌 thuringiensis Vip3Aa 的杀虫活性需要一个特定的细胞受体. 这项研究发现,无论是Scavenger Receptor-C的Sf-MAM域还是Spodoptera frugiperda的Sf-FGFRectodomain都不与Vip3Aa结合,因此需要进一步识别受体.
科学领域:
- 分子生物学分子生物学
- 昆虫毒理学 昆虫毒理学
- 生物化学 生物化学
背景情况:
- 突菌 (Bacillus thuringiensis Vip3Aa) 对于转基因作物的昆虫耐药性至关重要.
- 此前曾提出Sf-SR-C和纤维细胞生长因子受体 (Sf-FGFR) 作为Vip3Aa受体.
- Vip3Aa及其昆虫细胞受体之间的精确相互作用机制仍然未被阐明.
研究的目的:
- 研究Vip3Aa与潜在的受体Sf-SR-C和Sf-FGFR之间的结合相互作用.
- 为了确定Sf-SR-C的Sf-MAM域或Sf-FGFRectodomain是否直接结合Vip3Aa.
主要方法:
- 净化Sf-MAM域和Sf-FGFRectodomain. 清除Sf-MAM域和Sf-FGFRectodomain. 清除Sf-MAM域和Sf-FGFRectodomain. 清除Sf-MAM域和Sf-FGFRectodomain. 清除Sf-MAM域和Sf-FGFRectodomain. 清除Sf-MAM域和Sf-FGFRectodomain. 清除Sf-FGFRectodomain. 清除Sf-MAM域和Sf-FGFRectodomain. 清除Sf-FGFRectodomain.
- 确定Sf-MAM域的晶体结构.
- 基于Sf-MAM和Vip3Aa C端域 (CTD) 的基于结构的对接分析.
- 表面等离子体共振 (SPR) 测试以评估结合动力学.
主要成果:
- 结构对接分析排除了Sf-MAM和Vip3Aa CTD之间的直接结合.
- SPR测定证实Sf-MAM,Sf-FGFR外主体和Vip3Aa之间没有结合.
- 之前识别的受体Sf-SR-C和Sf-FGFR似乎没有直接结合Vip3Aa.
结论:
- 这些发现挑战了Sf-SR-C和Sf-FGFR作为直接Vip3Aa受体的既定作用.
- 迫切需要确定负责Vip3Aa结合和Spodoptera frugiperda中毒性的实际细胞受体.
- 这项研究突出了了解Vip3Aa作用模式的差距.
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