MECHANISM OF ACTION OF BACILLUS-THURINGIENSIS TOXINS

被引:14
|
作者
GILL, SS [1 ]
机构
[1] UNIV CALIF RIVERSIDE, ENVIRONM TOXICOL GRAD PROGRAM, RIVERSIDE, CA 92521 USA
来源
MEMORIAS DO INSTITUTO OSWALDO CRUZ | 1995年 / 90卷 / 01期
关键词
BACILLUS THURINGIENSIS; RECEPTORS; PORE FORMATION; SYNERGISM;
D O I
10.1590/S0074-02761995000100016
中图分类号
R38 [医学寄生虫学]; Q [生物科学];
学科分类号
07 ; 0710 ; 09 ; 100103 ;
摘要
The selectivity of Bacillus thuringiensis toxins is determined both by the toxin structure and by factors inherent to the insect. These toxins contain distinct domains that appear to be functionally important in toxin binding to protein receptors in the midgut of susceptible insects, and the subsequent formation of a pore in the insect midgut epithelium. In this article features necessary for the insecticidal activity of these toxins are discussed. These include toxin structure, toxin processing in the insect midgut, the identification of toxin receptors in susceptible insects, and toxin pore formation in midgut cells. in addition a number of B. thuringiensis toxins act synergistically to exert their full insecticidal activity. This synergistic action is critical not only for expressing the insecticidal activity of these toxins, but could also play a role in delaying the onset of insect resistance.
引用
收藏
页码:69 / 74
页数:6
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