Insecticidal polypeptides having broad spectrum activity and uses thereof
The disclosure provides nucleic acids, and variants and fragments thereof, obtained from strains of Bacillus thuringiensis encoding polypeptides having pesticidal activity against insect pests, including Lepidopteran and Coleopteran. Particular embodiments of the disclosure provide isolated nucleic acids encoding pesticidal proteins, pesticidal compositions, DNA constructs, and transformed microorganisms and plants comprising a nucleic acid of the embodiments. These compositions find use in methods for controlling pests, especially plant pests.
1. A variant Cry1J polypeptide comprising an amino acid sequence selected from SEQ ID NO: 4 and SEQ ID NO: 8 having a Valine substitution at position 578 compared to the native Cry1J polypeptide of SEQ ID NO: 2, wherein the variant Cry1J polypeptide has insecticidal activity against European corn borer, corn earworm, black cutworm, fall armyworm, Soybean looper and Velvet bean caterpillar, and increased stability against proteolytic degradation compared to the Cry1J polypeptide of SEQ ID NO: 2.
2. A variant Cry1J polypeptide comprising an amino acid sequence selected from SEQ ID NO: 4 and SEQ ID NO: 8 having a Valine substitution at position 578 compared to the native Cry1J polypeptide of SEQ ID NO: 2, wherein the variant Cry1J polypeptide has insecticidal activity against European corn borer, corn earworm, black cutworm, fall armyworm, Soybean looper and Velvet bean caterpillar, and increased stability against proteolytic degradation as measured in a Simulated Gastric Fluid (SGF) assay.
3. A recombinant nucleic acid molecule encoding the variant Cry1J polypeptide of claim 1 .
4. The recombinant nucleic acid molecule of claim 3 , wherein the nucleic acid sequence has been optimized for expression in a plant.
5. The recombinant nucleic acid molecule of claim 4 , wherein the nucleic acid sequence is a synthetic nucleotide sequence having plant preferred codons that have been designed for expression in a plant.
6. The recombinant nucleic acid molecule of claim 3 wherein the nucleic acid sequence has been optimized for expression in soybean.
7. The recombinant nucleic acid molecule of claim 3 , wherein the nucleic acid is selected from SEQ ID NO: 3, and SEQ ID NO: 7.
8. A DNA construct comprising the nucleic acid molecule of claim 3 and a heterologous regulatory element operably linked to the nucleic acid molecule.
9. A host cell comprising the DNA construct of claim 8 .
10. The host cell of claim 9 , wherein the host cell is a bacterial cell.
11. The host cell of claim 9 , wherein the host cell is a plant cell.
12. The host cell of claim 9 , wherein the host cell is a soybean cell.
13. A transgenic plant comprising the host cell of claim 9 .
14. The transgenic plant of claim 13 , wherein said plant is selected from the group consisting of maize, sorghum, wheat, cabbage, sunflower, tomato, a crucifer species, a pepper species, potato, cotton, rice, soybean, sugar beet, sugarcane, tobacco, barley, and oilseed rape.
15. A seed comprising the DNA construct of claim 8 .
16. A composition comprising the variant Cry1J polypeptide of claim 1 .
17. The composition of claim 16 , wherein the composition comprises from 1% to 99% by weight of the variant Cry1J polypeptide.
18. A method for controlling a Lepidopteran pest population comprising contacting said population with a pesticidally-effective amount of the variant Cry1J polypeptide of claim 1 .
19. A method for killing a Lepidopteran pest comprising contacting said pest with, or feeding to said pest, a pesticidally-effective amount of the variant Cry1J polypeptide of claim 1 .
20. A method for producing a polypeptide with pesticidal activity, comprising culturing the host cell of claim 9 under conditions in which the nucleic acid molecule encoding the variant Cry1J polypeptide is expressed.
21. A plant or plant cell having stably incorporated into its genome the DNA construct of claim 8 .
22. A method of protecting a plant from an insect pest, comprising introducing into said plant the DNA construct of claim 7 .
23. The method of claim 19 , wherein the insect pest is Soybean Looper ( Chrysodeixis includens ).