Bt Cry毒素抗虫模拟物靶向创新设计  

Targeted innovative design of Bt Cry toxin insecticidal mimics

作　　者：徐重新[1] 刘媛[1] 张霄[1] 刘贤金[1] XU Chongxin;LIU Yuan;ZHANG Xiao;LIU Xianjin(Jiangsu Key Laboratory of Food Quality and Safety-Laboratory for Food Quality and Safety State Key Laboratory Cultivation Base of Ministry of Science and Technology,Institute of Food Safety and Nutrition,Jiangsu Academy of Agricultural Sciences,Nanjing 210014,Jiangsu,China)

机构地区：[1]江苏省农业科学院农产品质量安全与营养研究所/省部共建国家重点实验室培育基地-江苏省食品质量安全重点实验室,江苏南京210014

出　　处：《生物工程学报》2023年第2期446-458,共13页Chinese Journal of Biotechnology

基　　金：国家自然科学基金(31630061,31972292);国家重点基础研究发展计划(2012CB722505)。

摘　　要：Bt Cry毒素是当前研究最深入、应用最广的生物抗虫蛋白,对农业害虫的绿色防治发挥了重大作用。然而,随着其制剂和转基因抗虫作物的广泛应用,由此驱动诱发的靶标害虫抗药性及潜在生态安全风险等问题日益凸显。探寻具备模拟Bt Cry毒素杀虫功能的新型抗虫蛋白材料,不仅可为农作物持续健康生产保驾护航,也能在一定程度上缓解靶标害虫对Bt Cry毒素的抗药性压力。近年来,笔者团队以抗体“免疫网络学说(immune network theory)”中Ab2β类型抗独特型抗体(anti-idiotype antibody, Anti-Id)具备模拟抗原结构和功能的特性为理论依据,借助噬菌体展示抗体库及特异性抗体高通量筛选与鉴定技术,设计Bt Cry毒素抗体为包被靶点抗原,从噬菌体抗体库中靶向筛选到了一系列具备模拟Bt Cry毒素抗虫功能的Ab2β类型抗独特型抗体(即Bt Cry毒素抗虫模拟物),其中活性最强的Bt Cry毒素抗虫模拟物对靶标害虫的致死率接近相应原Bt Cry毒素的80%,初步实现了Bt Cry毒素抗虫模拟物的靶向设计。本文从理论依据、技术条件、研究现状等方面进行系统概述,并就相关技术发展趋势以及如何推进现有成果落地应用等展开深入探讨,旨在为绿色抗虫材料创新研发提供全新思路和实例参考。Bt Cry toxin is the mostly studied and widely used biological insect resistance protein, which plays a leading role in the green control of agricultural pests worldwide.However, with the wide application of its preparations and transgenic insecticidal crops, the resistance to target pests and potential ecological risks induced by the drive are increasingly prominent and attracting much attention. The researchers seek to explore new insecticidal protein materials that can simulate the insecticidal function of Bt Cry toxin. This will help to escort the sustainable and healthy production of crops, and relieve the pressure of target pests’ resistance to Bt Cry toxin to a certain extent. In recent years, the author’s team has proposed that Ab2β anti-idiotype antibody has the property of mimicking antigen structure and function based on the “Immune network theory” of antibody. With the help of phage display antibody library and specific antibody high-throughput screening and identification technology, Bt Cry toxin antibody was designed as the coating target antigen, and a series of Ab2β anti-idiotype antibodies(namely Bt Cry toxin insecticidal mimics) were screened from the phage antibody library. Among them, the lethality of Bt Cry toxin insecticidal mimics with the strongest activity was close to 80% of the corresponding original Bt Cry toxin, showing great promise for the targeted design of Bt Cry toxin insecticidal mimics. This paper systematically summarized the theoretical basis, technical conditions, research status, and discussed the development trend of relevant technologies and how to promote the application of existing achievements, aiming to facilitate the research and development of green insect-resistant materials.

关 键 词：Bt Cry毒素 抗独特型抗体 噬菌体展示抗体 抗虫蛋白 生物防治 

分 类 号：TQ450.1[化学工程—农药化工]