Suppression of resistance in insects to bacillus...

C - Chemistry – Metallurgy – 07 – K

Patent

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Details

C07K 14/325 (2006.01) A01H 5/00 (2006.01) C12N 15/32 (2006.01) C12N 15/70 (2006.01) C12N 15/75 (2006.01) C12N 15/82 (2006.01)

Patent

CA 2690188

The invention relates to a method for obtaining DNA constructions coding for Cry toxins with 3 domains (also known as Cry toxins, Bt toxins or .delta.-endotoxins), which lack helix .alpha.-1. Said DNA constructions were modified in order to encode proteins that can kill insects that are resistant to the corresponding non-modified Cry toxins. The invention relates to the DNA constructions of the genes of modified 3-domain Cry toxins and the modified 3-domain Cry proteins, together with methods, molecular vectors and host cells containing said constructions, as well as recombinant methods for producing the modified 3-domain Cry toxins. In addition, the invention relates to formulations containing the modified 3- domain Cry toxins. Resistance of insects to non-modified Cry toxins is due to a reduced binding of the toxin to the receptors in the insect's intestine. More specifically, the invention relates to the expression of the modified 3-domain Cry toxins, the methods for expressing said modified 3-domain Cry toxins, transformed microorganisms and transgenic plants with constructions that express the modified 3-domain Cry toxins and methods for suppressing resistance of pests to non-modified Cry toxins.

La presente invención provee un método para obtener construcciones de DNA que codifican para toxinas Cry de 3-dominios (también llamadas toxinas Cry, toxinas Bt, o d- endotoxinas) que carecen de la hélice a-1. Estas construcciones de DNA fueron modificadas para codificar proteínas capaces de matar insectos que presentan resistencia a las correspondientes toxinas Cry no-modificadas. Las construcciones de DNA de los genes de toxinas cry de 3 -Dominios Modificadas y las proteínas Cry de 3 -Dominios Modificadas se presentan junto con los métodos, los vectores moleculares y las células huésped que contienen estas construcciones, así como los métodos recombinantes para producir las Toxinas Cry de 3-Dominios Modificadas. Además, en esta invención se describen formulaciones conteniendo a las Toxinas Cry de 3 -Dominios Modificadas. La resistencia de los insectos a toxinas Cry no-modificadas se debe a una menor unión de la toxina a los receptores que se encuentran en el intestino del insecto. La presente invención provee la expresión de las construcciones de Toxinas Cry de 3 -Dominios Modificadas, los métodos de expresión de estas Toxinas Cry de 3 -Dominios Modificadas, los microorganismos transformados y las plantas transgénicas con construcciones que expresan las Toxinas Cry de 3 -Dominios Modificadas, y los métodos para suprimir la resistencia de insectos plaga hacia toxinas Cry no-modificadas.

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