Insecticidal proteins and methods for their use
Compositions and methods for controlling pests are provided. The methods involve transforming organisms with a nucleic acid sequence encoding an insecticidal protein. In particular, the nucleic acid sequences are useful for preparing plants and microorganisms that possess insecticidal activity. Thus, transformed bacteria, plants, plant cells, plant tissues and seeds are provided. Compositions are insecticidal nucleic acids and proteins of bacterial species. The sequences find use in the construction of expression vectors for subsequent transformation into organisms of interest including plants, as probes for the isolation of other homologous (or partially homologous) genes. The pesticidal proteins find use in controlling, inhibiting growth or killing Lepidopteran, Coleopteran, Dipteran, fungal, Hemipteran and nematode pest populations and for producing compositions with insecticidal activity.
1. A polypeptide comprising a heterologous signal sequence or transit peptide operably linked to the PtIP-83 polypeptide of SEQ ID NO: 1.
2. The polypeptide of claim 1 , wherein the PtIP-83 polypeptide has insecticidal activity against Corn Earworm ( Helicoverpa zea ).
3. The polypeptide of claim 1 , wherein the PtIP-83 polypeptide specifically binds to a brush border membrane vesicle isolated from a Lepidoptera.
4. The polypeptide of claim 1 , wherein the PtIP-83 polypeptide disrupts the ionic balance across a brush border membrane vesicle isolated from a Lepidoptera.
5. A recombinant polynucleotide encoding the PtIP-83 polypeptide of SEQ ID NO: 1, wherein the polynucleotide is operably linked to a heterologous regulatory element.
6. The recombinant polynucleotide of claim 5 , wherein the polynucleotide is a non-genomic polynucleotide.
7. The recombinant polynucleotide of claim 6 , wherein the polynucleotide is a cDNA, a synthetic polynucleotide or has codons optimized for expression in an agriculturally important crop.
8. A transgenic plant comprising the polynucleotide of claim 5 .
9. A DNA construct comprising the polynucleotide of claim 5 operably linked to a heterologous regulatory element.
10. A transgenic plant or plant cell comprising the DNA construct of claim 9 .
11. An agricultural composition comprising an insecticidal effective dose of the PtIP-83 polypeptide of claim 1 .
12. The agricultural composition of claim 11 further comprising at least one agriculturally acceptable carrier.
13. A method for controlling an insect pest population, comprising contacting the insect pest population with the polypeptide of claim 1 .
14. A method of inhibiting growth or killing an insect pest, comprising contacting the insect pest with a composition comprising the polypeptide of claim 1 .
15. A method of controlling Lepidoptera and/or Coleoptera insect infestation in a transgenic plant and providing insect resistance management, comprising expressing in the plant the polynucleotide of claim 5 .
16. A method for controlling an insect pest population, comprising contacting the insect pest population with the transgenic plant or plant cell of claim 10 .
17. A method of inhibiting growth or killing an insect pest, comprising contacting the insect pest with the transgenic plant or plant cell of claim 10 .
18. The method of any one of claim 13 , 14 , 15 , 16 or 17 , wherein the insect or insect population is resistant to at least one Bt toxin.
19. The recombinant polynucleotide of claim 5 , wherein the polynucleotide comprises the sequence of SEQ ID NO: 2.