Competition of Bacillus thuringiensis Cry1 toxins for midgut binding sites: a basis for the development and management of transgenic tropical maize resistant to several stemborers.
Binding and competition of five Bacillus thuringiensis toxins--Cry1Ab, Cry1Ac, Cry1Ba, Cry1Ca, and Cry1Ea--for midgut binding sites from three pests, Spodoptera frugiperda, Diatraea saccharalis, and Diatraea grandiosella, were investigated as part of a strategy to develop tropical transgenic maize resistant to several stemborers. On S. frugiperda, Cry1Ab and Cry1Ac compete for the same binding site; Cry1Ba and Cry1Ca compete for a second binding site. Cry1Ea recognizes a third specific binding site in S. frugiperda and does not compete with any of the other toxins. On D. grandiosella and D. saccharalis, Cry1Ac competes with Cry1Ab and not with Cry1Ba and Cry1Ca. Cry1Ba and Cry1Ca recognize each a specific binding site and do not compete with any of the other four toxins. Cry1Ea does not recognize any binding site on Diatraea species. Combinations of toxins are proposed to develop transgenic maize resistant to the three stemborers while allowing resistance management.
Cirad, TA40/PS1, Boulevard de la Lironde, 34398, Montpellier 05, France.
Cécile
C
Rang
David
D
Bergvingson
Natasha
N
Bohorova
David
D
Hoisington
Roger
R
Frutos
D000818:Animals; D001413:Bacillus thuringiensis / Q000235:genetics / Q000378:metabolism*; D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins / Q000378:metabolism / Q000494:pharmacology*; D001427:Bacterial Toxins / Q000378:metabolism / Q000494:pharmacology*; D001665:Binding Sites; D001667:Binding, Competitive; D004731:Endotoxins / Q000378:metabolism / Q000494:pharmacology*; D006460:Hemolysin Proteins; D007814:Larva / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D007915:Lepidoptera / Q000187:drug effects / Q000378:metabolism / Q000382:microbiology*; D010572:Pest Control, Biological; D030821:Plants, Genetically Modified; D003313:Zea mays / Q000469:parasitology*
D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins; D001427:Bacterial Toxins; D004731:Endotoxins; D006460:Hemolysin Proteins; C030956:insecticidal crystal protein, Bacillus Thuringiensis