Bt toxin modification for enhanced efficacy.

Bt toxin modification for enhanced efficacy.
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DOI:
10.3390/toxins6103005
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发表时间:
2014-10-22
期刊:
影响因子:
4.2
通讯作者:
Bonning BC
Bonning BC
中科院分区:
医学2区
文献类型:
--
作者:
Deist BR;Rausch MA;Fernandez-Luna MT;Adang MJ;Bonning BC

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源自苏云金芽孢杆菌 (Bt) 的昆虫特异性毒素为抑制害虫提供了宝贵的资源。在此,我们回顾了用于增强针对特定目标物种(包括那些已进化出 Bt 抗性的物种)的毒性或改变 Bt 晶体 (Cry) 和细胞溶解 (Cyt) 毒素的宿主范围的不同策略。这些策略包括毒素截断、蛋白酶切割位点修饰、结构域交换、定点诱变、肽添加以及噬菌体展示筛选活性增强的突变毒素。毒素优化提供了一种有用的方法来扩展这些蛋白质的效用,以抑制对天然 Bt 毒素表现出低敏感性的害虫,并克服田间抗性。
Insect-specific toxins derived from Bacillus thuringiensis (Bt) provide a valuable resource for pest suppression. Here we review the different strategies that have been employed to enhance toxicity against specific target species including those that have evolved resistance to Bt, or to modify the host range of Bt crystal (Cry) and cytolytic (Cyt) toxins. These strategies include toxin truncation, modification of protease cleavage sites, domain swapping, site-directed mutagenesis, peptide addition, and phage display screens for mutated toxins with enhanced activity. Toxin optimization provides a useful approach to extend the utility of these proteins for suppression of pests that exhibit low susceptibility to native Bt toxins, and to overcome field resistance.
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