WO2004074462A2 - Delta-endotoxin genes and methods for their use - Google Patents
Delta-endotoxin genes and methods for their use Download PDFInfo
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- WO2004074462A2 WO2004074462A2 PCT/US2004/005829 US2004005829W WO2004074462A2 WO 2004074462 A2 WO2004074462 A2 WO 2004074462A2 US 2004005829 W US2004005829 W US 2004005829W WO 2004074462 A2 WO2004074462 A2 WO 2004074462A2
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
- C12N15/79—Vectors or expression systems specially adapted for eukaryotic hosts
- C12N15/82—Vectors or expression systems specially adapted for eukaryotic hosts for plant cells, e.g. plant artificial chromosomes (PACs)
- C12N15/8241—Phenotypically and genetically modified plants via recombinant DNA technology
- C12N15/8261—Phenotypically and genetically modified plants via recombinant DNA technology with agronomic (input) traits, e.g. crop yield
- C12N15/8271—Phenotypically and genetically modified plants via recombinant DNA technology with agronomic (input) traits, e.g. crop yield for stress resistance, e.g. heavy metal resistance
- C12N15/8279—Phenotypically and genetically modified plants via recombinant DNA technology with agronomic (input) traits, e.g. crop yield for stress resistance, e.g. heavy metal resistance for biotic stress resistance, pathogen resistance, disease resistance
- C12N15/8286—Phenotypically and genetically modified plants via recombinant DNA technology with agronomic (input) traits, e.g. crop yield for stress resistance, e.g. heavy metal resistance for biotic stress resistance, pathogen resistance, disease resistance for insect resistance
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/195—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from bacteria
- C07K14/32—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from bacteria from Bacillus (G)
- C07K14/325—Bacillus thuringiensis crystal protein (delta-endotoxin)
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/146—Genetically Modified [GMO] plants, e.g. transgenic plants
Definitions
- This invention relates to the field of molecular biology. Provided are novel genes that encode pesticidal proteins. These proteins and the nucleic acid sequences that encode them are useful in preparing pesticidal formulations and in the production of transgenic pest-resistant plants.
- Bacillus thuringiensis is a Gram-positive spore forming soil bacterium characterized by its ability to produce crystalline inclusions that are specifically toxic to certain orders and species of insects, but are harmless to plants and other non- targeted organisms. For this reason, compositions including Bacillus thuringiensis strains or their insecticidal proteins can be used as environmentally acceptable insecticides to control agricultural insect pests or insect vectors for a variety of human or animal diseases. Crystal (Cry) proteins (delta-endotoxins) from Bacillus thuringiensis have potent insecticidal activity against predominantly Lepidopteran, Dipteran, and Coleopteran larvae.
- the major classes were Lepidoptera-specific (I), Lepidoptera- and Diptera-specific (II), Coleoptera-specific (III), Diptera-specific (IV), and nematode-specific (V) and (VI).
- the proteins were further classified into subfamilies; more highly related proteins within each family were assigned divisional letters such as Cryl A, CrylB, CrylC, etc. Even more closely related proteins within each division were given names such as CrylCl, CrylC2, etc.
- each toxin is assigned a unique name incorporating a primary rank (an Arabic number), a secondary rank (an uppercase letter), a tertiary rank (a lowercase letter), and a quaternary rank (another Arabic number).
- a primary rank an Arabic number
- a secondary rank an uppercase letter
- a tertiary rank a lowercase letter
- a quaternary rank another Arabic number.
- Roman numerals have been exchanged for Arabic numerals in the primary rank. Proteins with less than 45% sequence identity have different primary ranks, and the criteria for secondary and tertiary ranks are 78% and 95%, respectively.
- the crystal protein does not exhibit insecticidal activity until it has been ingested and solubilized in the insect midgut.
- the ingested protoxin is hydrolyzed by proteases in the insect digestive tract to an active toxic molecule. (H ⁇ fte and Whiteley (1989) Microbiol. Rev. 53 :242-255).
- This toxin binds to apical brush border receptors in the midgut of the target larvae and inserts into the apical membrane creating ion channels or pores, resulting in larval death.
- Delta-endotoxins generally have five conserved sequence domains, and three conserved structural domains (see, for example, de Maagd et al. (2001) Trends Genetics 17:193-199).
- the first conserved structural domain consists of seven alpha helices and is involved in membrane insertion and pore formation.
- Domain II consists of three beta-sheets arranged in a Greek key configuration, and domain III consists of two antiparallel beta-sheets in 'jelly-roll' formation (de Maagd et al. (2001) supra). Domains II and III are involved in receptor recognition and binding, and are therefore considered determinants of toxin specificity.
- compositions and methods for conferring pesticide resistance to bacteria, plants, plant cells, tissues, and seeds are provided.
- Compositions include isolated nucleic acid molecules encoding sequences for delta-endotoxin and delta-endotoxin- associated polypeptides, vectors comprising those nucleic acid molecules, and host cells comprising the vectors.
- Compositions also include isolated or recombinant polypeptide sequences of the endotoxin, compositions comprising these polypeptides, and antibodies to those polypeptides.
- the nucleotide sequences can be used in DNA constructs or expression cassettes for transformation and expression in organisms, including microorganisms and plants.
- nucleotide or amino acid sequences may be synthetic sequences that have been designed for optimum expression in an organism, including, but not limited to, a microorganism or a plant.
- Compositions also comprise transformed bacteria, plants, plant cells, tissues, and seeds.
- the present invention provides for isolated nucleic acid molecules comprising a nucleotide sequence encoding an amino acid sequence shown in SEQ ID NO:3, 5, 7, 9, 11, 14, 16, 18, 20, 22, 24, 27, or 29, or a nucleotide sequence set forth in SEQ LD NO:l, 2, 4, 6, 8, 10, 12, 13, 15, 17, 19, 21, 23, 25, 26, or 28, as well as variants and fragments thereof.
- Nucleotide sequences that are complementary to a nucleotide sequence of the invention, or that hybridize to a sequence of the invention, are also encompassed.
- compositions and methods of the invention are useful for the production of organisms with pesticide resistance, specifically bacteria and plants. These organisms and compositions derived from them are desirable for agricultural purposes.
- compositions of the invention are also useful for generating altered or improved delta-endotoxin or delta-endotoxin-associated proteins that have pesticidal activity, or for detecting the presence of delta-endotoxin or delta-endotoxin-associated proteins or nucleic acids in products or organisms.
- FIGURES Figure 1 shows an alignment of AXMI-004 (SEQ LD NO:3) with cry 1 Ac (SEQ ID NO:31), crylCa (SEQ LD NO:32), cry2Aa (SEQ ID NO:34), cry3Aal (SEQ LD NO:35), crylla (SEQ LD NO:33), and cry7Aa (SEQ LD NO:41).
- Toxins having C- terminal non-toxic domains were artificially truncated as shown.
- the alignment shows the most highly conserved amino acid residues highlighted in black, and highly conserved amino acid residues highlighted in gray. conserveed group 1 is found from about amino acid residue 174 to about 196 of SEQ LD NO: 3.
- conserveed group 2 is found from about amino acid residue 250 to about 292 of SEQ LD NO:3.
- conserveed group 3 is found from about amino acid residue 476 to about 521 of SEQ ID NO:3.
- conserveed group 4 is found from about amino acid residue 542 to about 552 of SEQ LD NO:3.
- conserveed group 5 is found from about amino acid residue 618 to about 628 of SEQ ID NO:3
- Figures 2A, B, and C show an alignment of AXMI-006 (SEQ LD NO:7) with cryl Aa (SEQ LD NO:30), cryl Ac (SEQ LD NO:31), crylla (SEQ LD NO:33), cry3Aal (SEQ LD NO:35), cry3Ba (SEQ LD NO:36), cry 4Aa (SEQ LD NO:38), cry6Aa (SEQ LD NO:40), cry7Aa (SEQ ID NO:41), cry8Aa (SEQ LD NO:42), crylOAa (SEQ ID
- cryl6Aa SEQ ID NO:44
- cryl9Ba SEQ ID NO:45
- cry24Aa SEQ LD NO:47.
- Toxins having C-terminal non-toxic domains were artificially truncated as shown.
- the alignment shows the most highly conserved amino acid residues highlighted in black, and highly conserved amino acid residues highlighted in gray.
- conserveed group 1 is found from about amino acid residue 218 to about 239 of SEQ LD NO:7.
- conserveed group 2 is found from about amino acid residue 300 to about 350 of SEQ LD NO:7.
- conserveed group 3 is found from about amino acid residue 547 to about 592 of SEQ LD NO:7.
- conserveed group 4 is found from about amino acid residue 611 to about 621 of SEQ LD NO:7.
- conserveed group 5 is found from about amino acid residue 694 to about 704 of SEQ LD NO:7.
- Figures 3 A, B, and C show an alignment of AXMI-007 (SEQ LD NO:9) with crylAa (SEQ LD NO:30), cryl Ac (SEQ LD NO:31), crylla (SEQ LD NO:33), cry3Aal (SEQ LD NO:35), cry3Ba (SEQ LD NO:36), cry 4Aa (SEQ LD NO:38), cry ⁇ Aa (SEQ LD NO:40), cry7Aa (SEQ ID NO:41), crySAa (SEQ LD NO:42), crylOAa (SEQ LD NO:9)
- cryl6Aa SEQ LD NO:44
- cryl9Ba SEQ LD NO:45
- cry24Aa SEQ LD NO:47
- Toxins having C-terminal non-toxic domains were artificially truncated as shown.
- the alignment shows the most highly conserved amino acid residues highlighted in black, and highly conserved amino acid residues highlighted in gray.
- conserveed group 1 is found from about amino acid residue 217 to about 238 of SEQ LD NO:9.
- conserveed group 2 is found from about amino acid residue 299 to about 347 of SEQ LD NO:9.
- conserveed group 3 is found from about amino acid residue 445 to about 590 of SEQ LD NO:9.
- conserveed group 4 is found from about amino acid residue 609 to about 619 of SEQ LD NO:9.
- conserveed group 5 is found from about amino acid residue 692 to about 702 of SEQ LD NO:9.
- Figures 4A, B, and C show an alignment of AXMI-008 (SEQ LD NO: 14) with crylAa (SEQ LD NO:30), cryl Ac (SEQ LD NO:31), crylla (SEQ LD NO:33), cry2Aa (SEQ LD NO:34), cry3Aal (SEQ ID NO:35), cry3Bb (SEQ LD NO:37), cry4Aa (SEQ ID NO:38), cry4Ba (SEQ LD NO:39), cry6Aa (SEQ ID NO:40), cry7Aa (SEQ ID NO:41), cry8Aa (SEQ ID NO:42), crylOAa (SEQ LD NO:43), cryl6Aa (SEQ ID NO:44), cryl9Ba (SEQ ID NO:45), cry24Aa (SEQ ID NO:47), cry25Aa (SEQ LD NO:48), cry39Aal (SEQ LD NO:49), and cry40Aal (SEQ ID NO:51
- Toxins having C-terminal non-toxic domains were artificially truncated as shown. The alignment shows the most highly conserved amino acid residues highlighted in black, and highly conserved amino acid residues highlighted in gray.
- conserveed group 1 is found from about amino acid residue 185 to about 206 of SEQ LD NO: 14.
- conserved group 2 is found from about amino acid residue 276 to about 318 of SEQ LD NO: 14.
- conserveed group 3 is found from about amino acid residue 497 to about 547 of SEQ ID NO: 14.
- conserveed group 4 is found from about amino acid residue 576 to about 586 of SEQ LD NO: 14.
- conserveed group 5 is found from about amino acid residue 657 to about 667 of SEQ LD NO:14.
- Figures 5A and B show an alignment of AXMI-008orf2 (SEQ LD NO: 18) with cryl9Aa-orf2 (SEQ LD NO:46), crybun2-orf2 (SEQ LD NO:50), crybun3-orf2 (SEQ LD NO:52), cry4Aa (SEQ LD NO:38), and cry4Ba (SEQ LD NO:39).
- the alignment shows the most highly conserved amino acid residues highlighted in black, and highly conserved amino acid residues highlighted in gray.
- Figures 6A, B, and C show an alignment of AXMI-009 (SEQ LD NO:20) with cryl Aa (SEQ LD NO:30), cryl Ac (SEQ LD NO:31), crylCa (SEQ LD NO:32), crylla (SEQ LD NO:33), cry3Aal (SEQ LD NO:35), cry3Ba (SEQ LD NO:36), cry3Bb (SEQ ID NO:37), cry4Aa (SEQ ID NO:38), cry6Aa (SEQ LD NO:40), cry7Aa (SEQ LD NO:41), cry ⁇ Aa (SEQ ID NO:42), crylOAa (SEQ LD NO:43), cryl6Aa (SEQ ID NO:44), cryl9Ba (SEQ LD NO:45), cry24Aa (SEQ LD NO:47), cry25Aa (SEQ ID NO:48), cry40Aal (SEQ LD NO:51).
- Toxins having C-terminal non-toxic domains were artificially truncated as shown. The alignment shows the most highly conserved amino acid residues highlighted in black, and highly conserved amino acid residues highlighted in gray.
- conserveed group 1 is found from about amino acid residue 196 to about 217 of SEQ LD NO:20.
- conserveed group 2 is found from about amino acid residue 269 to about 311 of SEQ LD NO:20.
- conserveed group 3 is found from about amino acid residue 514 to about 556 of SEQ LD NO:20.
- conserveed group 4 is found from about amino acid residue 574 to about 584 of SEQ LD NO:20.
- conserveed group 5 is found from about amino acid residue 651 to about 661 of SEQ LD NO:20.
- Figures 7A, B, and C show an alignment of AXMI-014 (SEQ LD NO:27) with crylAa (SEQ LD NO:30), cryl Ac (SEQ LD NO:31), crylla (SEQ LD NO:33), cry2Aa (SEQ LD NO:34), cry3Aal (SEQ LD NO:35), cry3Bb (SEQ LD NO:37), cry4Aa (SEQ ID NO:38), cry4Ba (SEQ LD NO:39), cry6Aa (SEQ LD NO:40), cry7Aa (SEQ LD NO:41), cry ⁇ Aa (SEQ ID NO:42), crylOAa (SEQ LD NO:43), cryl ⁇ Aa (SEQ LD NO:44), cryl9Ba (SEQ ID NO:45), cry24Aa (SEQ LD NO:47), cry25Aa (SEQ LD NO:48), cry39Aal (SEQ LD NO:49), and cry40Aal (SEQ
- Toxins having C-terminal non-toxic domains were artificially truncated as shown. The alignment shows the most highly conserved amino acid residues highlighted in black, and highly conserved amino acid residues highlighted in gray.
- conserveed group 1 is found from about amino acid residue 177 to about 188 of SEQ LD NO:27.
- conserveed group 2 is found from about amino acid residue 251 to about 293 of SEQ LD NO:27.
- conserveed group 3 is found from about amino acid residue 483 to about 533 of SEQ ID NO:27.
- conserveed group 4 is found from about amino acid residue 552 to about 562 of SEQ LD NO:27.
- Figure 8 shows a photograph of a 4-20% gradient SDS acrylamide gel. Lanes 1-4 contain various concentrations of sporulated Bacillus cell culture expressing 69 kD AXMI-004 protein. Lanes 5-8 contain various concentrations of BSA. Lane 9 contains a size marker. An arrow indicates the 69 kD band.
- the present invention is drawn to compositions and methods for regulating pest resistance in organisms, particularly plants or plant cells.
- the methods involve transforming organisms with a nucleotide sequence encoding a delta-endotoxin or delta-endotoxin-associated protein of the invention.
- the nucleotide sequences of the invention are useful for preparing plants and microorganisms that possess pesticidal activity.
- transformed bacteria, plants, plant cells, plant tissues and seeds are provided.
- Compositions are delta-endotoxin or delta-endotoxin- associated nucleic acids and proteins of Bacillus thuringiensis.
- sequences find use in the construction of expression vectors for subsequent transformation into organisms of interest, as probes for the isolation of other delta-endotoxin or delta- endotoxin-associated genes, and for the generation of altered pesticidal proteins by methods known in the art, such as domain swapping or DNA shuffling.
- the proteins find use in controlling or killing lepidopteran or coleopteran pest populations and for producing compositions with pesticidal activity.
- delta-endotoxin is intended a toxin from Bacillus thuringiensis that has toxic activity against one or more pests, including, but not limited to, members of the Lepidoptera, Diptera, and Coleoptera orders.
- delta-endotoxin proteins have been isolated from other organisms, including Clostridium bifermentans and Paenibacillus popilliae.
- Delta-endotoxin proteins include amino acid sequences deduced from the full-length nucleotide sequences disclosed herein, and amino acid sequences that are shorter than the full-length sequences, either due to the use of an alternate downstream start site, or due to processing that produces a shorter protein having pesticidal activity.
- Delta-endotoxins include proteins identified as cryl through cry43, cytl and cyt2, and Cyt-like toxin.
- Bacterial genes such as the AXMI genes of this invention, quite often possess multiple methionine initiation codons in proximity to the start of the open reading frame. Often, translation initiation at one or more of these start codons will lead to generation of a functional protein. These start codons can include ATG codons. However, bacteria such as Bacillus sp. also recognize the codon GTG as a start codon, and proteins that initiate translation at GTG codons contain a methionine at the first amino acid. Furthermore, it is not often determined a priori which of these codons are used naturally in the bacterium.
- an alternate start site for an AXMI-004 delta- endotoxin protein of the invention is at base pair 385 of SEQ LD NO: 1. Translation from this alternate start site results in the amino acid sequence found in SEQ LD NO:5.
- An alternate start site for an AXMI-007 delta-endotoxin protein of the invention may be at base pair 151 of SEQ LD NO:8. Translation from this alternate start site results in the amino acid sequence found in SEQ ID NO:l 1.
- An alternate start site for an AXMI-008 delta-endotoxin protein of the invention maybe at nucleotide 177 of SEQ ID NO: 12. Translation from this alternate start site results in the amino acid sequence found in SEQ LD NO: 16.
- An alternate start site for an AXMI-008 delta-endotoxin protein of the invention maybe at nucleotide 177 of SEQ ID NO: 12. Translation from this alternate start site results in the amino acid sequence found in SEQ LD NO: 16.
- AXMI-009 delta-endotoxin protein of the invention may be at nucleotide 34 of SEQ ID NO: 19. Translation from this alternate start site results in the amino acid sequence found in SEQ LD NO:22.
- An additional alternate start site for an AXMI-009 delta- endotoxin protein of the invention may be at nucleotide 64 of SEQ LD NO: 1. Translation from this alternate start site results in the amino acid sequence found in SEQ ID NO:24.
- An alternate start site for an AXMI-014 delta-endotoxin protein of the invention may be at base pair 136 of SEQ LD NO:25. Translation from this alternate start site results in the amino acid sequence found in SEQ LD NO:29.
- delta-endotoxin-associated protein is intended a protein encoded by a nucleotide sequence disclosed herein using an alternate open reading frame than that used by the delta-endotoxins of the present invention. Proteins such as these are known in the art as helper proteins, stabilizing sequences, or delta-endotoxin- associated proteins. These delta-endotoxin-associated proteins may have pesticidal activity, or maybe important in facilitating expression of delta-endotoxin proteins.
- delta-endotoxin-associated proteins are encompassed by the present invention, and may be used in the methods disclosed herein, either alone or in combination with known delta-endotoxin proteins.
- the delta-endotoxin-associated protein has the amino acid sequence found in SEQ ID NO: 18 and is encoded by the nucleotide sequence of SEQ LD NO:17.
- plant cell is intended all known forms of plant, including undifferentiated tissue (e.g. callus), suspension culture cells, protoplasts, leaf cells, root cells, phloem cells, plant seeds, pollen, propagules, embryos and the like.
- plant expression cassette is intended a DNA construct that is capable of resulting in the expression of a protein from an open reading frame in a plant cell. Typically these contain a promoter and a coding sequence. Often, such constructs will also contain a 3 ' untranslated region.
- Such constructs may contain a 'signal sequence' or 'leader sequence' to facilitate co-translational or post-translational transport of the peptide to certain intracellular structures such as the chloroplast (or other plastid), endoplasmic reticulum, or Golgi apparatus.
- signal sequence is intended a sequence that is known or suspected to result in cotranslational or post-translational peptide transport across the cell membrane. In eukaryotes, this typically involves secretion into the Golgi apparatus, with some resulting glycosylation.
- leader sequence is intended any sequence that when translated, results in an amino acid sequence sufficient to trigger cotranslational transport of the peptide chain to a sub-cellular organelle. Thus, this includes leader sequences targeting transport and/or glycosylation by passage into the endoplasmic reticulum, passage to vacuoles, plastids including chloroplasts, mitochondria, and the like.
- plant transformation vector is intended a DNA molecule that is necessary for efficient transformation of a plant cell.
- Such a molecule may consist of one or more plant expression cassettes, and may be organized into more than one 'vector' DNA molecule.
- binary vectors are plant transformation vectors that utilize two non-contiguous DNA vectors to encode all requisite cis- and transacting functions for transformation of plant cells (Hellens and Mullineaux (2000) Trends in Plant Science 5:446-451).
- Vector refers to a nucleic acid construct designed for transfer between different host cells.
- Expression vector refers to a vector that has ability to incorporate, integrate and express heterologous DNA sequences or fragments in a foreign cell.
- Transgenic plants or “transformed plants” or “stably transformed plants or cells or tissues” refers to plants that have incorporated or integrated exogenous nucleic acid sequences or DNA fragments into the plant cell. These nucleic acid sequences include those that are exogenous, or not present in the untransformed plant cell, as well as those that may be endogenous, or present in the untransformed plant cell.
- “Heterologous” generally refers to the nucleic acid sequences that are not endogenous to the cell or part of the native genome in which they are present, and have been added to the cell by infection, transfection, microinjection, electroporation, microprojection, or the like.
- Promoter refers to a nucleic acid sequence that functions to direct transcription of a downstream coding sequence.
- the promoter together with other transcriptional and translational regulatory nucleic acid sequences are necessary for the expression of a DNA sequence of interest.
- novel isolated nucleotide sequences that confer pesticidal activity.
- amino acid sequences for the delta-endotoxin and delta-endotoxin-associated proteins are also provided. The protein resulting from translation of this gene allows cells to control or kill pests that ingest it.
- nucleic acid molecule or protein is substantially free of other cellular material, or culture medium when produced by recombinant techniques, or substantially free of chemical precursors or other chemicals when chemically synthesized.
- an “isolated” nucleic acid is free of sequences (preferably protein encoding sequences) that naturally flank the nucleic acid (i.e., sequences located at the 5' and 3' ends of the nucleic acid) in the genomic DNA of the organism from which the nucleic acid is derived.
- isolated when used to refer to nucleic acid molecules excludes isolated chromosomes.
- the isolated delta-endotoxin or delta-endotoxin-associated-encoding nucleic acid molecule can contain less than about 5 kb, 4 kb, 3 kb, 2 kb, 1 kb, 0.5 kb, or 0.1 kb of nucleotide sequence that naturally flanks the nucleic acid molecule in genomic DNA of the cell from which the nucleic acid is derived.
- a delta-endotoxin or delta- endotoxin-associated protein that is substantially free of cellular material includes preparations of protein having less than about 30%, 20%, 10%, or 5% (by dry weight) of non-delta-endotoxin or non-delta-endotoxin-associated protein (also referred to herein as a "contaminating protein").
- contaminating protein also referred to herein as a "contaminating protein"
- nucleic acid molecules comprising nucleotide sequences encoding delta-endotoxin or delta-endotoxin- associated proteins and polypeptides or biologically active portions thereof, as well as nucleic acid molecules sufficient for use as hybridization probes to identify delta- endotoxin or delta-endotoxin-associated-encoding nucleic acids.
- nucleic acid molecule is intended to include DNA molecules (e.g., cDNA or genomic DNA) and RNA molecules (e.g., mRNA) and analogs of the DNA or RNA generated using nucleotide analogs.
- the nucleic acid molecule can be single-stranded or double-stranded, but preferably is double-stranded DNA.
- Nucleotide sequences encoding the proteins of the present invention include the sequences set forth in SEQ LD NOS:l, 2, 4, 6, 8, 10, 12, 13, 15, 17, 19, 21, 23, 25, 26, and 28, and complements thereof.
- complement is intended a nucleotide sequence that is sufficiently complementary to a given nucleotide sequence such that it can hybridize to the given nucleotide sequence to thereby form a stable duplex.
- Nucleic acid molecules that are fragments of these delta-endotoxin or delta- endotoxin-associated protein-encoding nucleotide sequences are also encompassed by the present invention.
- fragment is intended a portion of the nucleotide sequence encoding a delta-endotoxin protein or delta-endotoxin-associated protein.
- a fragment of a nucleotide sequence may encode a biologically active portion of a delta- endotoxin or delta-endotoxin-associated protein, or it may be a fragment that can be used as a hybridization probe or PCR primer using methods disclosed below.
- Nucleic acid molecules that are fragments of a delta-endotoxin or a delta-endotoxin-associated nucleotide sequence comprise at least about 15, 20, 50, 75, 100, 200, 300, 350, 400, 450, 500, 550, 600, 650, 700, 750, 800, 850, 900, 950, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, 1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500, 3000, 3500, 4000, 4500, 5000, 5500 nucleotides, or up to the number of nucleotides present in a full-length delta-endotoxin or delta-endotoxin-associated protein-encoding nucleotide sequence disclosed herein (for example, 2190 nucleotides for SEQ LD NO:l, 1890 for SEQ ID NO:2, etc.), depending upon the intended use.
- Fragments of the nucleotide sequences of the present invention will encode protein fragments that retain the biological activity of the delta endotoxin or delta- endotoxin-associated protein and, hence, retain pesticidal activity or delta-endotoxin- associated protein activity, respectively.
- delta-endotoxin activity is intended pesticidal activity.
- delta-endotoxin-associated protein activity is intended that the protein have pesticidal activity, or that the protein improves expression of a delta- endotoxin protein. This improvement in protein expression can happen by any mechanism.
- the fragment will have at least about 30%, preferably at least about 50%, more preferably at least about 70%, even more preferably at least about 80% of the activity of the delta-endotoxin or delta-endotoxin- associated protein.
- Methods are known in the art for determining the effects of delta- endotoxin-associated proteins on delta-endotoxin protein expression and crystal formation (see, for example, Park et al. (1999) FEMS Microbiol. Lett. 181:319-327; Ge et al. (1998) FEMS Microbiol. Lett. 165:35-41; Rosso and Delecluse (1997) Appl. Environ. Microbiol. 63:4449-4455).
- a fragment of a delta-endotoxin or delta-endotoxin-associated protein- encoding nucleotide sequence that encodes a biologically active portion of a protein of the invention will encode at least about 15, 25, 30, 50, 75, 100, 125, 150, 175, 200, 250, 300, 350, 400, 450, 500, 550, 600, or 650 contiguous amino acids, or up to the total number of amino acids present in a full-length delta-endotoxin or delta- endotoxin-associated protein of the invention (for example, 629 amino acids for SEQ LD NO:3, 601 amino acids for SEQ LD NO:5, etc.).
- Preferred delta-endotoxin or delta-endotoxin-associated proteins of the present invention are encoded by a nucleotide sequences sufficiently identical to the nucleotide sequences of in SEQ LD NO:3, 5, 7, 9, 11, 14, 16, 18, 20, 22, 24, 27, or 29.
- “sufficiently identical” is intended an amino acid or nucleotide sequence that has at least about 60% or 65% sequence identity, preferably about 70% or 75% sequence identity, more preferably about 80% or 85% sequence identity, most preferably about 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% sequence identity compared to a reference sequence using one of the alignment programs described herein using standard parameters.
- the determination of percent identity between two sequences can be accomplished using a mathematical algorithm.
- a nonlimiting example of a mathematical algorithm utilized for the comparison of two sequences is the algorithm of Karlin and Altschul (1990) Proc. Natl. Acad. Sci. USA 87:2264, modified as in Karlin and Altschul (1993) Proc. Natl. Acad. Sci. USA 90:5873-5877. Such an algorithm is incorporated into the BLASTN and BLASTX programs of Altschul et al. (1990) J. Mol. Biol. 215:403.
- Gapped BLAST can be utilized as described in Altschul et al. (1997) Nucleic Acids Res. 25:3389.
- PSI- Blast can be used to perform an iterated search that detects distant relationships between molecules.
- the ClustalW algorithm is used in several commercially available DNA/amino acid analysis software packages, such as the ALIGNX module of the vector NTi Program Suite (friformax, Inc). After alignment of amino acid sequences with ClustalW, the percent amino acid identity can be assessed.
- a non-limiting example of a software program useful for analysis of ClustalW alignments is GeneDocTM. GenedocTM (Karl Nicholas) allows assessment of amino acid (or DNA) similarity and identity between multiple proteins.
- Another non- limiting example of a mathematical algorithm utilized for the comparison of sequences is the algorithm of Myers and Miller (1988) CABIOS 4:11-17.
- ALIGN program version 2.0
- GCG sequence alignment software package available from Accelrys, Inc., 9865 Scranton Rd., San Diego, California, USA.
- the invention also encompasses variant nucleic acid molecules.
- "Variants" of the delta-endotoxin or delta-endotoxin-associated protein-encoding nucleotide sequences include those sequences that encode the delta-endotoxin or delta- endotoxin-associated proteins disclosed herein but that differ conservatively because of the degeneracy of the genetic code as well as those that are sufficiently identical as discussed above.
- Naturally occurring allelic variants can be identified with the use of well-known molecular biology techniques, such as polymerase chain reaction (PCR) and hybridization techniques as outlined below.
- PCR polymerase chain reaction
- Variant nucleotide sequences also include synthetically derived nucleotide sequences that have been generated, for example, by using site-directed mutagenesis but which still encode the delta- endotoxin or delta-endotoxin-associated proteins disclosed in the present invention as discussed below.
- Variant proteins encompassed by the present invention are biologically active, that is they continue to possess the desired biological activity of the native protein, that is, retaining pesticidal activity. By "retains activity” is intended that the variant will have at least about 30%, preferably at least about 50%, more preferably at least about 70%, even more preferably at least about 80% of the activity of the delta-endotoxin or delta-endotoxin-associated protein.
- the invention also encompasses variant nucleic acid molecules.
- "Variants" of the delta-endotoxin or delta-endotoxin-associated-encoding nucleotide sequences include those sequences that encode the delta-endotoxin or delta-endotoxin-associated proteins disclosed herein but that differ conservatively because of the degeneracy of the genetic code as well as those that are sufficiently identical as discussed above.
- Naturally occurring allelic variants can be identified with the use of well-known molecular biology techniques, such as polymerase chain reaction (PCR) and hybridization techniques as outlined below.
- PCR polymerase chain reaction
- Variant nucleotide sequences also include synthetically derived nucleotide sequences that have been generated, for example, by using site-directed mutagenesis but which still encode the delta- endotoxin or delta-endotoxin-associated proteins disclosed in the present invention as discussed below.
- variant isolated nucleic acid molecules can be created by introducing one or more nucleotide substitutions, additions, or deletions into the corresponding nucleotide sequence disclosed herein, such that one or more amino acid substitutions, additions or deletions are introduced into the encoded protein. Mutations can be introduced by standard techniques, such as site-directed mutagenesis and PCR-mediated mutagenesis. Such variant nucleotide sequences are also encompassed by the present invention.
- conservative amino acid substitutions may be made at one or more predicted, preferably nonessential amino acid residues.
- a "nonessential" amino acid residue is a residue that can be altered from the wild-type sequence of a delta-endotoxin or delta-endotoxin-associated protein without altering the biological activity, whereas an "essential" amino acid residue is required for biological activity.
- a “conservative amino acid substitution” is one in which the amino acid residue is replaced with an amino acid residue having a similar side chain. Families of amino acid residues having similar side chains have been defined in the art.
- amino acids with basic side chains e.g., lysine, arginine, histidine
- acidic side chains e.g., aspartic acid, glutamic acid
- uncharged polar side chains e.g., glycine, asparagine, glutamine, serine, threonine, tyrosine, cysteine
- nonpolar side chains e.g., alanine, valine, leucine, isoleucine, proline, phenylalanine, methionine, tryptophan
- beta-branched side chains e.g., threonine, valine, isoleucine
- aromatic side chains e.g., tyrosine, phenylalanine, tryptophan, histidine
- delta- endotoxins having these conserved regions may share a similar structure, consisting of three domains (Li et al. (1991) Nature 353: 815-821). Domain I has the highest similarity between delta-endotoxins (Bravo (1997) J Bacteriol. 179:2793-2801). Amino acid substitutions may be made in nonconserved regions that retain function. In general, such substitutions would not be made for conserved amino acid residues, or for amino acid residues residing within a conserved motif, where such residues are essential for protein activity.
- residues that are conserved and that may be essential for protein activity include, for example, residues that are identical between all proteins contained in the alignments provided.
- residues that are conserved but that may allow conservative amino acid substitutions and still retain activity include, for example, residues that have only conservative substitutions between all proteins contained in the alignments provided.
- residues that have only conservative substitutions between all proteins contained in the alignments provided include, for example, residues that have only conservative substitutions between all proteins contained in the alignments provided.
- one of skill in the art would understand that functional variants may have minor conserved or nonconserved alterations in the conserved residues.
- variant nucleotide sequences can be made by introducing mutations randomly along all or part of the coding sequence, such as by saturation mutagenesis, and the resultant mutants can be screened for ability to confer delta- endotoxin or delta-endotoxin-associated activity to identify mutants that retain activity.
- the encoded protein can be expressed recombinantly, and the activity of the protein can be determined using standard assay techniques.
- delta- endotoxin or delta-endotoxin-associated sequences can be identified, such sequences having substantial identity to the sequences of the invention. See, for example, Sambrook J., and Russell, D.W. (2001) Molecular Cloning: A Laboratory Manual. (Cold Spring Harbor Laboratory Press, Cold Spring Harbor, NY) and Innis, et al. (1990) PCR Protocols: A Guide to Methods and Applications (Academic Press, NY).
- all or part of the delta-endotoxin or delta- endotoxin-associated nucleotide sequence can be used to screen cDNA or genomic libraries.
- hybridization probes may be genomic DNA fragments, cDNA fragments, RNA fragments, or other oligonucleotides, and may be labeled with a detectable group such as 32 P, or any other detectable marker, such as other radioisotopes, a fluorescent compound, an enzyme, or an enzyme co-factor.
- Probes for hybridization can be made by labeling synthetic oligonucleotides based on the known delta-endotoxin or delta- endotoxin-associated-encoding nucleotide sequence disclosed herein.
- the probe typically comprises a region of nucleotide sequence that hybridizes under stringent conditions to at least about 12, preferably about 25, more preferably at least about 50, 75, 100, 125, 150, 175, 200, 250, 300, 350, or 400 consecutive nucleotides of delta-endotoxin or delta-endo toxin-associated-encoding nucleotide sequence of the invention or a fragment or variant thereof.
- Preparation of probes for hybridization is generally known in the art and is disclosed in Sambrook and Russell, 2001, herein incorporated by reference.
- hybridization techniques all or part of a known nucleotide sequence is used as a probe that selectively hybridizes to other corresponding nucleotide sequences present in a population of cloned genomic DNA fragments or cDNA fragments (i.e., genomic or cDNA libraries) from a chosen organism.
- the hybridization probes may be genomic DNA fragments, cDNA fragments, RNA fragments, or other oligonucleotides, and may be labeled with a detectable group such as P, or any other detectable marker.
- probes for hybridization can be made by labeling synthetic oligonucleotides based on the delta-endotoxin or delta-endotoxin- associated sequence of the invention.
- the entire delta-endotoxin or delta-endotoxin-associated sequence disclosed herein, or one or more portions thereof, may be used as a probe capable of specifically hybridizing to corresponding delta-endotoxin or delta- endotoxin-associated-like sequences and messenger RNAs.
- probes include sequences that are unique and are preferably at least about 10 nucleotides in length, and most preferably at least about 20 nucleotides in length.
- Such probes may be used to amplify corresponding delta-endotoxin or delta-endotoxin-associated sequences from a chosen organism by PCR.
- Hybridization techniques include hybridization screening of plated DNA libraries (either plaques or colonies; see, for example, Sambrook et al. (1989) Molecular Cloning: A Laboratory Manual (2d ed., Cold Spring Harbor Laboratory Press, Plainview, New York). Hybridization of such sequences may be carried out under stringent conditions.
- stringent conditions or “stringent hybridization conditions” is intended conditions under which a probe will hybridize to its target sequence to a detectably greater degree than to other sequences (e.g., at least 2-fold over background). Stringent conditions are sequence-dependent and will be different in different circumstances.
- a probe is less than about 1000 nucleotides in length, preferably less than 500 nucleotides in length.
- stringent conditions will be those in which the salt concentration is less than about 1.5 M Na ion, typically about 0.01 to 1.0 M Na ion concentration (or other salts) at pH 7.0 to 8.3 and the temperature is at least about 30°C for short probes (e.g., 10 to 50 nucleotides) and at least about 60°C for long probes (e.g., greater than 50 nucleotides).
- Stringent conditions may also be achieved with the addition of destabilizing agents such as formamide.
- Exemplary moderate stringency conditions include hybridization in 40 to 45% formamide, 1.0 M NaCI, 1% SDS at 37°C, and a wash in 0.5X to IX SSC at 55 to 60°C.
- Exemplary high stringency conditions include hybridization in 50% formamide, 1 M NaCI, 1% SDS at 37°C, and a wash in 0.1X SSC at 60 to 65°C.
- wash buffers may comprise about 0.1% to about 1% SDS. Duration of hybridization is generally less than about 24 hours, usually about 4 to about 12 hours.
- T m 81.5°C + 16.6 (log M) + 0.41 (%GC) - 0.61 (% form) - 500/L; where M is the molarity of monovalent cations, %GC is the percentage of guanosine and cytosine nucleotides in the DNA, % form is the percentage of formamide in the hybridization solution, and L is the length of the hybrid in base pairs.
- the T m is the temperature (under defined ionic strength and pH) at which 50% of a complementary target sequence hybridizes to a perfectly matched probe. T m is reduced by about 1°C for each 1% of mismatching; thus, T m , hybridization, and/or wash conditions can be adjusted to hybridize to sequences of the desired identity. For example, if sequences with >90% identity are sought, the T m can be decreased 10°C. Generally, stringent conditions are selected to be about 5°C lower than the thermal melting point (T m ) for the specific sequence and its complement at a defined ionic strength and pH.
- Delta-endotoxin and delta-endotoxin-associated proteins are also encompassed within the present invention.
- delta-endotoxin protein is intended a protein having the amino acid sequence set forth in SEQ ID NO:3, 5, 7, 9, 11, 14, 16, 20, 22, 24, 27, or 29.
- delta-endotoxin-associated protein is intended a protein having the amino acid sequence set forth in SEQ LD NO: 18. Fragments, biologically active portions, and variants thereof are also provided, and may be used to practice the methods of the present invention.
- “Fragments” or “biologically active portions” include polypeptide fragments comprising a portion of an amino acid sequence encoding a delta-endotoxin or delta- endotoxin-associated protein as set forth in SEQ ID NO:3, 5, 7, 9, 11, 14, 16, 18, 20, 22, 24, 27, or 29, and that retain delta-endotoxin activity or delta-endotoxin- associated activity.
- a biologically active portion of a delta-endotoxin or delta- endotoxin-associated protein can be a polypeptide that is, for example, 10, 25, 50, 100 or more amino acids in length.
- Such biologically active portions can be prepared by recombinant techniques and evaluated for delta-endotoxin or delta-endotoxin- associated activity.
- a fragment comprises at least 8 contiguous amino acids SEQ LD NO:3, 5, 7, 9, 11, 14, 16, 18, 20, 22, 24, 27, or 29.
- the invention encompasses other fragments, however, such as any fragment in the protein greater than about 10, 20, 30, 50, 100, 150, 200, 250, 300, 350, 400, 450, 500, 550, 600, and 650 amino acids.
- variants proteins or polypeptides having an amino acid sequence that is at least about 60%, 65%, preferably about 70%, 75%, more preferably about 80%, 85%, most preferably about 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% identical to the amino acid sequence of SEQ LD NO:3, 5, 7, 9, 11, 14, 16, 18, 20, 22, 24, 27, or 29.
- variants also include polypeptides encoded by a nucleic acid molecule that hybridizes to the nucleic acid molecule of SEQ LD NO:l, 2, 4, 6, 8, 10, 12, 13, 15, 17, 19, 21, 23, 25, 26, or 28, or a complement thereof, under stringent conditions.
- variants generally retain delta-endotoxin or delta- endotoxm-associated activity.
- Variants include polypeptides that differ in amino acid sequence due to mutagenesis.
- Variant proteins encompassed by the present invention are biologically active, that is they continue to possess the desired biological activity of the native protein, that is, retaining pesticidal activity. Methods for measuring pesticidal activity are well known in the art. See, for example, Czapla and Lang (1990) J. Econ. Entomol. 83(6): 2480-2485; Andrews et al. (1988) Biochem. J. 252:199-206; Marrone et al. (1985) J. of Economic Entomology 78:290-293; and U.S. Patent No. 5,743,477, all of which are herein incorporated by reference in their entirety.
- DNA sequences of a delta-endotoxin or delta-endotoxin-associated protein may be altered by various methods, and that these alterations may result in DNA sequences encoding proteins with amino acid sequences different than that encoded by the delta-endotoxin or delta-endotoxin-associated protein of the present invention.
- This protein may be altered in various ways including amino acid substitutions, deletions, truncations, and insertions. Methods for such manipulations are generally known in the art.
- amino acid sequence variants of the delta-endotoxin or delta-endotoxin-associated protein can be prepared by mutations in the DNA. This may also be accomplished by one of several forms of mutagenesis and/or in directed evolution.
- the changes encoded in the amino acid sequence will not substantially affect the function of the protein. Such variants will possess the desired pesticidal activity.
- a delta-endotoxin or delta-endotoxin-associated protein may be improved by the use of such techniques upon the compositions of this invention. For example, one may express the delta-endotoxin or delta-endotoxin-associated protein in host cells that exhibit high rates of base misincorporation during DNA replication, such as XL-1 Red (Stratagene).
- the protein is mixed and used in feeding assays. See, for example Marrone et al. (1985) J. of Economic Entomology 78:290-293.
- Such assays can include contacting plants with one or more pests and determining the plant's ability to survive and/or cause the death of the pests. Examples of mutations that result in increased toxicity are found in Schnepf et al. (1998) Microbiol. Mol. Biol. Rev. 62:775-806.
- alterations may be made to the protein sequence of many proteins at the amino or carboxy terminus without substantially affecting activity.
- This can include insertions, deletions, or alterations introduced by modern molecular methods, such as PCR, including PCR amplifications that alter or extend the protein coding sequence by virtue of inclusion of amino acid encoding sequences in the oligonucleotides utilized in the PCR amplification.
- the protein sequences added can include entire protein-coding sequences, such as those used commonly in the art to generate protein fusions.
- Such fusion proteins are often used to (1) increase expression of a protein of interest (2) introduce a binding domain, enzymatic activity, or epitope to facilitate either protein purification, protein detection, or other experimental uses known in the art (3) target secretion or translation of a protein to a subcellular organelle, such as the periplasmic space of Gram-negative bacteria, or the endoplasmic reticulum of eukaryotic cells, the latter of which often results in glycosylation of the protein.
- a subcellular organelle such as the periplasmic space of Gram-negative bacteria, or the endoplasmic reticulum of eukaryotic cells, the latter of which often results in glycosylation of the protein.
- Variant nucleotide and amino acid sequences of the present invention also encompass sequences derived from mutagenic and recombinogenic procedures such as DNA shuffling. With such a procedure, one or more different delta-endotoxin or delta-endotoxin-associated protein coding regions can be used to create a new delta- endotoxin or delta-endotoxin-associated protein possessing the desired properties. In this manner, libraries of recombinant polynucleotides are generated from a population of related sequence polynucleotides comprising sequence regions that have substantial sequence identity and can be homologously recombined in vitro or in vivo.
- sequence motifs encoding a domain of interest may be shuffled between the delta-endotoxin or delta-endotoxin-associated gene of the invention and other known delta-endotoxin or delta-endotoxin-associated genes to obtain a new gene coding for a protein with an improved property of interest, such as an increased insecticidal activity.
- Strategies for such DNA shuffling are known in the art. See, for example, Stemmer (1994) Proc. Natl. Acad. Sci. USA 91:10747-10751; Stemmer (1994) Nature 370:389-391; Crameri et al. (1997) Nature Biotech. 15:436- 438; Moore et al. (1997) J.
- Domain swapping or shuffling is another mechanism for generating altered delta-endotoxin or delta-endotoxin-associated proteins. Domains II and III may be swapped between delta-endotoxin proteins, resulting in hybrid or chimeric toxins with improved pesticidal activity or target spectrum. Methods for generating recombinant proteins and testing them for pesticidal activity are well known in the art (see, for example, Naimov et al. (2001) Appl. Environ. Microbiol. 67:5328-5330; de Maagd et al. (1996) Appl. Environ. Microbiol. 62:1537-1543; Ge et al. (1991) J. Biol. Chem.
- Transformation of plant cells can be accomplished by one of several techniques known in the art.
- a construct that expresses such a protein would contain a promoter to drive transcription of the gene, as well as a 3 ' untranslated region to allow transcription termination and polyadenylation.
- the organization of such constructs is well known in the art.
- the gene can be engineered to contain a signal peptide to facilitate transfer of the peptide to the endoplasmic reticulum.
- This 'plant expression cassette' will be inserted into a 'plant transformation vector'.
- This plant transformation vector may be comprised of one or more DNA vectors needed for achieving plant transformation.
- DNA vectors needed for achieving plant transformation.
- Binary vectors as well as vectors with helper plasmids are most often used for Agrobacterium-mediated transformation, where the size and complexity of DNA segments needed to achieve efficient transformation is quite large, and it is advantageous to separate functions onto separate DNA molecules.
- Binary vectors typically contain a plasmid vector that contains the cis-acting sequences required for T-DNA transfer (such as left border and right border), a selectable marker that is engineered to be capable of expression in a plant cell, and a 'gene of interest' (a gene engineered to be capable of expression in a plant cell for which generation of transgenic plants is desired). Also present on this plasmid vector are sequences required for bacterial replication. The cis-acting sequences are arranged in a fashion to allow efficient transfer into plant cells and expression therein. For example, the selectable marker gene and the gene of interest are located between the left and right borders.
- a second plasmid vector contains the trans-acting factors that mediate T-DNA transfer from Agrobacterium to plant cells.
- This plasmid often contains the virulence functions (Vir genes) that allow infection of plant cells by Agrobacterium, and transfer of DNA by cleavage at border sequences and vir- mediated DNA transfer, as in understood in the art (Hellens and Mullineaux (2000) Trends in Plant Science, 5:446-451).
- Several types of Agrobacterium strains e.g. LBA4404, GV3101, EHA101, EHA105, etc.
- the second plasmid vector is not necessary for transforming the plants by other methods such as microprojection, microinjection, electroporation, polyethelene glycol, etc. hi general, plant transformation methods involve transferring heterologous
- target plant cells e.g. immature or mature embryos, suspension cultures, undifferentiated callus, protoplasts, etc.
- a maximum threshold level of appropriate selection depending on the selectable marker gene
- Explants are typically transferred to a fresh supply of the same medium and cultured routinely.
- the transformed cells are differentiated into shoots after placing on regeneration medium supplemented with a maximum threshold level of selecting agent.
- the shoots are then transferred to a selective rooting medium for recovering rooted shoot or plantlet.
- the transgenic plantlet then grows into a mature plant and produces fertile seeds (e.g. Hiei et al.
- Transgenic plants may be performed by one of several methods, including but not limited to introduction of heterologous DNA by Agrobacterium into plant cells (Agrobacterium-mediated transformation), bombardment of plant cells with heterologous foreign DNA adhered to particles, and various other non-particle direct-mediated methods (e.g. Hiei et al. (1994) The Plant Journal 6: 271-282; Ishida et al. (1996) Nature Biotechnology 14: 745-750; Ayres and Park (1994) Critical Reviews in Plant Science 13: 219-239; Bommineni and Jauhar (1997) Maydica 42: 107-120) to transfer DNA.
- Agrobacterium-mediated transformation introduction of heterologous DNA by Agrobacterium into plant cells
- bombardment of plant cells with heterologous foreign DNA adhered to particles and various other non-particle direct-mediated methods (e.g. Hiei et al. (1994) The Plant Journal 6: 271-282; Ishida et al. (1996) Nature Biotechnology 14: 745-750
- Transformation protocols as well as protocols for introducing nucleotide sequences into plants may vary depending on the type of plant or plant cell, i.e., monocot or dicot, targeted for transformation. Suitable methods of introducing nucleotide sequences into plant cells and subsequent insertion into the plant genome include microinjection (Crossway et al. (1986) Biotechniques 4:320-334), electroporation (Riggs et al. (1986) Proc. Natl. Acad. Sci. USA 83:5602-5606, Agrobacterium-m.cd.mted transformation (U.S. Patent No. 5,563,055; U.S. Patent No. 5,981,840), direct gene transfer (Paszkowski et al.
- heterologous foreign DNA Following integration of heterologous foreign DNA into plant cells, one then applies a maximum threshold level of appropriate selection in the medium to kill the untransformed cells and separate and proliferate the putatively transformed cells that survive from this selection treatment by transferring regularly to a fresh medium. By continuous passage and challenge with appropriate selection, one identifies and proliferates the cells that are transformed with the plasmid vector. Then molecular and biochemical methods will be used for confirming the presence of the integrated heterologous gene of interest in the genome of transgenic plant. The cells that have been transformed may be grown into plants in accordance with conventional ways. See, for example, McCormick et al. (1986) Plant Cell Reports 5:81-84.
- transformed seed also referred to as "transgenic seed” having a nucleotide construct of the invention, for example, an expression cassette of the invention, stably incorporated into their genome.
- the delta-endotoxin or delta-endotoxin-associated sequences of the invention may be provided in expression cassettes for expression in the plant of interest.
- the cassette will include 5' and 3' regulatory sequences operably linked to a sequence of the invention.
- operably linked is intended a functional linkage between a promoter and a second sequence, wherein the promoter sequence initiates and mediates transcription of the DNA sequence corresponding to the second sequence.
- operably linked means that the nucleic acid sequences being linked are contiguous and, where necessary to join two protein coding regions, contiguous and in the same reading frame.
- the cassette may additionally contain at least one additional gene to be cotransformed into the organism. Alternatively, the additional gene(s) can be provided on multiple expression cassettes.
- Such an expression cassette is provided with a plurality of restriction sites for insertion of the delta-endotoxin or delta-endotoxin-associated sequence to be under the transcriptional regulation of the regulatory regions.
- the expression cassette will include in the 5'-3' direction of transcription, a transcriptional and translational initiation region (i.e., a promoter), a DNA sequence of the invention, and a transcriptional and translational termination region (i.e., termination region) functional in plants.
- the promoter may be native or analogous, or foreign or heterologous, to the plant host and/or to the DNA sequence of the invention. Additionally, the promoter may be the natural sequence or alternatively a synthetic sequence. Where the promoter is "native" or "homologous" to the plant host, it is intended that the promoter is found in the native plant into which the promoter is introduced.
- the promoter is “foreign” or “heterologous” to the DNA sequence of the invention, it is intended that the promoter is not the native or naturally occurring promoter for the operably linked DNA sequence of the invention.
- the termination region may be native with the transcriptional initiation region, may be native with the operably-linked DNA sequence of interest, may be native with the plant host, or may be derived from another source (i.e., foreign or heterologous to the promoter, the DNA sequence of interest, the plant host, or any combination thereof).
- Convenient termination regions are available from the Ti-plasmid of A. tumefaciens, such as the octopine synthase and nopaline synthase termination regions. See also Guerineau et al. (1991) Mol.
- the gene(s) may be optimized for increased expression in the transformed host cell. That is, the genes can be synthesized using host cell- preferred codons for improved expression, or may be synthesized using codons at a host-preferred codon usage frequency. See, for example, Campbell and Gowri (1990) Plant Physiol. 92:1-11 for a discussion of host-preferred codon usage. Methods are known in the art for synthesizing plant-preferred genes. See, for example, U.S. Patent Nos. 6,320,100; 6,075,185; 5,380,831; and 5,436,391, U.S. Published Application Nos. 20040005600 and 20010003849, and Murray et al. (1989) Nucleic Acids Res.
- the nucleic acids of interest are targeted to the chloroplast for expression.
- the expression cassette will additionally contain a nucleic acid encoding a transit peptide to direct the gene product of interest to the chloroplasts.
- transit peptides are known in the art. See, for example, Von Heijne et al. (1991) Plant Mol. Biol. Rep. 9:104-126; Clark et al. (1989) J. Biol. Chem. 264:17544-17550; Della-Cioppa et ⁇ /. (1987) Plant Physiol. 84:965-968; Romer et al. (1993) Biochem. Biophys. Res. Commun. 196:1414-1421; and Shah et al. (1986) Science 233:478-481.
- plastid transformation can be accomplished by transactivation of a silent plastid-borne transgene by tissue-preferred expression of a nuclear-encoded and plastid-directed RNA polymerase.
- tissue-preferred expression of a nuclear-encoded and plastid-directed RNA polymerase.
- the nucleic acids of interest to be targeted to the chloroplast may be optimized for expression in the chloroplast to account for differences in codon usage between the plant nucleus and this organelle. In this manner, the nucleic acids of interest may be synthesized using chloroplast-preferred codons. See, for example, U.S. Patent No. 5,380,831, herein incorporated by reference.
- heterologous foreign DNA Following introduction of heterologous foreign DNA into plant cells, the transformation or integration of heterologous gene in the plant genome is confirmed by various methods such as analysis of nucleic acids, proteins and metabolites associated with the integrated gene.
- PCR analysis is a rapid method to screen transformed cells, tissue or shoots for the presence of incorporated gene at the earlier stage before transplanting into the soil (Sambrook and Russell, 2001). PCR is carried out using oligonucleotide primers specific to the gene of interest ox Agrobacterium vector background, etc.
- Southern Analysis Plant transformation is confirmed by Southern blot analysis of genomic DNA (Sambrook and Russell, 2001). In general, total DNA is extracted from the transformant, digested with appropriate restriction enzymes, fractionated in an agarose gel and transferred to a nitrocellulose or nylon membrane. The membrane or "blot" then is probed with, for example, radiolabeled 32 P target DNA fragment to confirm the integration of introduced gene in the plant genome according to standard techniques (Sambrook and Russell, 2001. Molecular Cloning: A Laboratory Manual. Cold Spring Harbor Laboratory Press, Cold Spring Harbor, NY).
- RNA is isolated from specific tissues of transformant, fractionated in a formaldehyde agarose gel, blotted onto a nylon filter according to standard procedures that are routinely used in the art (Sambrook, J., and Russell, D.W. 2001. Molecular Cloning: A Laboratory Manual, Cold Spring Harbor Laboratory Press, Cold Spring Harbor, NY). Expression of RNA encoded by the delta-endotoxin or delta-endotoxin-associated is then tested by hybridizing the filter to a radioactive probe derived from a delta-endotoxin or delta-endotoxin-associated protein , by methods known in the art (Sambrook and Russell, 2001).
- Western blot and Biochemical assays may be carried out on the transgenic plants to confirm the presence of protein encoded by the delta-endotoxin or delta-endotoxin-associated gene by standard procedures (Sambrook, J., and Russell, D.W. 2001. Molecular Cloning: A Laboratory Manual, Cold Spring Harbor Laboratory Press, Cold Spring Harbor, NY) using antibodies that bind to one or more epitopes present on the delta-endotoxin or delta- endotoxin-associated protein.
- Methods described above by way of example may be utilized to generate transgenic plants, but the manner in which the transgenic plant cells are generated is not critical to this invention. Methods known or described in the art such as Agrobacterium-mediated transformation, aerosol beam, biolistic transformation, and non-particle-mediated methods may be used at the discretion of the experimenter.
- Plants expressing delta-endotoxin or delta-endotoxin-associated proteins may be isolated by common methods described in the art, for example by transformation of callus, selection of transformed callus, and regeneration of fertile plants from such transgenic callus. In such process, one may use any gene as a selectable marker so long as its expression in plant cells confers ability to identify or select for transformed cells.
- markers have been developed for use with plant cells, such as resistance to chloramphenicol, the aminoglycoside G418, hygromycin, or the like.
- Other genes that encode a product involved in chloroplast metabolism may also be used as selectable markers.
- genes that provide resistance to plant herbicides such as glyphosate, bromoxynil, or imidazolinone may find particular use.
- Such genes have been reported (Stalker et ⁇ l. (1985) J. Biol. Chem. 263:6310-6314 (bromoxynil resistance nitrilase gene); and Sathasivan et ⁇ l. (1990) Nucl. Acids Res. 18:2188 (AHAS imidazolinone resistance gene).
- Fertile plants expressing a delta-endotoxin or a delta-endotoxin-associated protein may be tested for pesticidal activity, and the plants showing optimal activity selected for further breeding. Methods are available in the art to assay for pest activity. Generally, the protein is mixed and used in feeding assays. See, for example Marrone et al. (1985) J of Economic Entomology 78:290-293.
- Bacillus strains of the invention or the microorganisms which have been genetically altered to contain the pesticidal gene and protein may be used for protecting agricultural crops and products from pests.
- whole, i.e., unlysed, cells of a toxin (pesticide)-producing organism are treated with reagents that prolong the activity of the toxin produced in the cell when the cell is applied to the environment of target pest(s).
- the pesticide is produced by introducing a heterologous gene into a cellular host. Expression of the heterologous gene results, directly or indirectly, in the intracellular production and maintenance of the pesticide.
- these cells are then treated under conditions that prolong the activity of the toxin produced in the cell when the cell is applied to the environment of target pest(s). The resulting product retains the toxicity of the toxin.
- These naturally encapsulated pesticides may then be formulated in accordance with conventional techniques for application to the environment hosting a target pest, e.g., soil, water, and foliage of plants. See, for example EPA 0192319, and the references cited therein.
- the active ingredients of the present invention are normally applied in the form of compositions and can be applied to the crop area or plant to be treated, simultaneously or in succession, with other compounds.
- These compounds can be fertilizers, weed killers, cryoprotectants, surfactants, detergents, pesticidal soaps, dormant oils, polymers, and/or time-release or biodegradable carrier formulations that permit long-term dosing of a target area following a single application of the formulation.
- Suitable carriers and adjuvants can be solid or liquid and correspond to the substances ordinarily employed in formulation technology, e.g. natural or regenerated mineral substances, solvents, dispersants, wetting agents, tackifiers, binders or fertilizers.
- the formulations may be prepared into edible "baits” or fashioned into pest "traps” to pennit feeding or ingestion by a target pest of the pesticidal formulation.
- Preferred methods of applying an active ingredient of the present invention or an agrochemical composition of the present invention which contains at least one of the pesticidal proteins produced by the bacterial strains of the present invention are leaf application, seed coating and soil application. The number of applications and the rate of application depend on the intensity of infestation by the corresponding pest.
- the composition may be formulated as a powder, dust, pellet, granule, spray, emulsion, colloid, solution, or such like, and may be preparable by such conventional means as desiccation, lyophilization, homogenation, extraction, filtration, centrifugation, sedimentation, or concentration of a culture of cells comprising the polypeptide.
- the polypeptide may be present in a concentration of from about 1% to about 99% by weight.
- Lepidopteran or coleopteran pests may be killed or reduced in numbers in a given area by the methods of the invention, or may be prophylactically applied to an environmental area to prevent infestation by a susceptible pest.
- a pesticidally-effective amount is intended an amount of the pesticide that is able to bring about death to at least one pest, or to noticeably reduce pest growth, feeding, or normal physiological development.
- the formulations may also vary with respect to climatic conditions, environmental considerations, and/or frequency of application and or severity of pest infestation.
- the pesticide compositions described may be made by formulating either the bacterial cell, crystal and/or spore suspension, or isolated protein component with the desired agriculturally-acceptable carrier.
- the compositions may be formulated prior to administration in an appropriate means such as lyophilized, freeze-dried, desiccated, or in an aqueous carrier, medium or suitable diluent, such as saline or other buffer.
- the formulated compositions may be in the form of a dust or granular material, or a suspension in oil (vegetable or mineral), or water or oil/water emulsions, or as a wettable powder, or in combination with any other carrier material suitable for agricultural application.
- Suitable agricultural carriers can be solid or liquid and are well known in the art.
- agriculturally-acceptable carrier covers all adjuvants, inert components, dispersants, surfactants, tackifiers, binders, etc. that are ordinarily used in pesticide formulation technology; these are well known to those skilled in pesticide formulation.
- the formulations may be mixed with one or more solid or liquid adjuvants and prepared by various means, e.g., by homogeneously mixing, blending and/or grinding the pesticidal composition with suitable adjuvants using conventional formulation techniques. Suitable formulations and application methods are described in U.S. Patent No. 6,468,523, herein incorporated by reference.
- “Pest” includes but is not limited to, insects, fungi, bacteria, nematodes, mites, ticks, and the like.
- Insect pests include insects selected from the orders Coleoptera, Diptera, Hymenoptera, Lepidoptera, Mallophaga, Homoptera, Hemiptera, Orthroptera, Thysanoptera, Dermaptera, Isoptera, Anoplura, Siphonaptera, Trichoptera, etc., particularly Coleoptera, Lepidoptera, and Diptera.
- Insect pests include insects selected from the orders Coleoptera, Diptera, Hymenoptera, Lepidoptera, Mallophaga, Homoptera, Hemiptera, Orthoptera, Thysanoptera, Dermaptera, Isoptera, Anoplura, Siphonaptera, Trichoptera, etc., particularly Coleoptera and Lepidoptera.
- Insect pests of the invention for the major crops include: Maize: Ostrinia nubilalis, European corn borer; Agrotis ipsilon, black cutworm; Helicoverpa zea, corn earworm; Spodoptera frugiperda, fall armyworm; Diatraea grandiose ⁇ la, southwestern corn borer; Elasmopalpus lignosellus, lesser cornstalk borer; Diatraea saccharalis, surgarcane borer; Diabrotica virgifera, western co rootworm; Diabrotica longicornis barberi, northern com rootworm; Diabrotica undecirnpunctata howardi, southern com rootworm; Melanotus spp., wireworms; Cyclocephala borealis, northern masked chafer (white grab); Cyclocephala immaculata, southern masked chafer (white grab); Popilliajaponica, Japanese beetle; Chaetocnema pulicaria
- Nematodes include parasitic nematodes such as root-knot, cyst, and lesion nematodes, including Heterodera spp., Meloidogyne spp., and Globodera spp.; particularly members of the cyst nematodes, including, but not limited to, Heterodera glycines (soybean cyst nematode); Heterodera schachtii (beet cyst nematode); Heterodera avenae (cereal cyst nematode); and Globodera rostochiensis and Globodera pailida (potato cyst nematodes).
- Lesion nematodes include Pratylenchus spp.
- Plasmid DNA from strains ATX 13026 or ATX 13002 were prepared in the following way. A pure culture of strain ATX13026 or strain ATX13002 was grown in large quantities of rich media. The culture was centrifuged to harvest the cell pellet. The cell pellet was then prepared by treatment with SDS by methods known in the art, resulting in breakage of the cell wall and release of DNA. Proteins and large genomic DNA was then precipitated by a high salt concentration. The plasmid DNA was precipitated by standard ethanol precipitation. The plasmid DNA was separated from any remaining cliromosomal DNA by high-speed centrifugation through a cesium chloride gradient. The DNA was visualized in the gradient by UV light and the band of lower density (i.e. the lower band) was extracted using a syringe. This band contained the plasmid DNA from the strain (either ATX 13026 or ATX 13002) The quality of the DNA was checked by visualization on an agarose gel by methods known in the art.
- the purified plasmid DNA was sheared into 5-10 kb sized fragments and the 5 ' and 3 ' single stranded overhangs repaired using T4 DNA polymerase and Klenow fragment in the presence of all four dNTPs, as known in the art. Phosphates were then attached to the 5 ' ends by treatment with T4 polynucleotide kinase, as known in the art.
- the repaired DNA fragments were ligated overnight into a standard high copy vector (i.e. pBluescript SK+), suitably prepared to accept the inserts as known in the art (for example by digestion with a restriction enzyme producing blunt ends).
- the libraries prepared by the methods above were plated onto rich media containing the appropriate antibiotic to maintain the plasmids clones, and colonies were individually picked into 96- well blocks containing 2 mis of media containing the appropriate antibiotic. These blocks were grown overnight at 37°C at a shaking speed of 350 rpm. The blocks were centrifuged to harvest the cells to the bottom of the block. Plasmid DNA was isolated from these cultures by standard alkaline lysis prep in a high throughput format. The end sequences of clones from this library were determined for a large number of clones from each block in the following way: The DNA sequence of each clone chosen for analysis was determined using the fluorescent dye terminator sequencing technique (Applied Biosystems) and standard primers flanking each side of the cloning site.
- the DNA was precipitated using standard ethanol precipitation.
- the DNA was resuspended in water and loaded onto a capillary sequencing machine. Each library plate of DNA was sequenced from either end of the cloning site, yielding two reads per plate over each insert.
- DNA sequences obtained were compiled into an assembly project and aligned together to form contigs. This can be done efficiently using a computer program, such as Vector NTi, or alternatively by using the Pred/Phrap suite of DNA alignment and analysis programs. These contigs, along with any individual read that may not have been added to a contig, were compared to a compiled database of all classes of known pesticidal genes. Contigs or individual reads identified as having identity to a known endotoxin or pesticidal gene were analyzed further.
- clones pAX004, pAX006, pAX007, pAX008, pAX009, and pAX014 contained DNA identified as having homology to known endotoxin genes. Therefore, these clones were selected for further sequencing.
- Example 5 Sequencing and Identification of Delta-Endotoxin Genes
- Primers were designed to anneal to sequences with homology to endotoxin genes, in a manner such that DNA sequences generated from such primers would overlap existing DNA sequence of the clone(s).
- This process known as "oligo walking," is well known in the art. This process was utilized to determine the entire DNA sequence of the region exhibiting homology to a known endotoxin gene. In the case of the clones mentioned above, this process was used to dete ⁇ nine the DNA sequence of the entire clone, resulting in a single nucleotide sequence for each gene. The completed DNA sequence was then placed back into the original large assembly for further validation. This allowed incorporation of more DNA sequence reads into the contig, resulting in multiple reads of coverage over the entire region.
- the open reading frame identified from pAX004 is designated as AXMI-004.
- the open reading frame identified from pAX006 is designated AXMI- 006.
- the open reading frame identified from pAX007 is designated AXMI-007.
- the open reading frame identified from pAX008 is designated AXMI-008.
- the open reading frame identified from pAX009 is designated AXMI-009.
- the open reading frame identified from pAX014 is designated AXMI-014.
- the DNA sequence of AXMI-004 is provided as SEQ LD NOS:l and 2, and the amino acid sequence of the predicted AMXI-004 protein is provided as SEQ ID NO:3.
- An alternate start site for AXMI-004 at nucleotide 385 of SEQ LD NO:l generates the amino acid sequence provided as SEQ LD NO:5.
- the DNA sequence of AXMI-006 is provided as SEQ LD NO:6, and the amino acid sequence of the predicted AMXI-006 protein is provided in SEQ LD NO:7.
- the DNA sequence of AXMI-007 is provided as SEQ LD NO:8, and the amino acid sequence of the predicted AMXI-007 protein is provided in SEQ ID NO:9.
- An alternate start site for AXMI-007 at nucleotide 151 of SEQ LD NO:8 generates the amino acid sequence provided as SEQ ID NO: 11.
- the DNA sequence of AXMI-008 is provided as SEQ LD NOS: 12 and 13, and the amino acid sequence of the predicted AMXI-008 protein is provided in SEQ LD NO: 14.
- An alternate start site for AXMI-008 at nucleotide 177 of SEQ LD NO: 12 generates the amino acid sequence provided as SEQ LD NO: 16. Further analysis identified an open reading frame immediately 3 ' to the end of the AXMI-008 open reading frame.
- AXMI-008orf2 This predicted amino acid sequence of this orf, referred to herein as AXMI-008orf2, is provided in SEQ JD NO:18.
- the DNA sequence of AXMI-009 is provided as SEQ ID NO:19, and the amino acid sequence of the predicted AMXI-009 protein is provided in SEQ LD NO:20.
- An alternate start site for AXMI-009 at nucleotide 34 of SEQ LD NO: 19 generates the amino acid sequence provided as SEQ LD NO:22.
- Another alternate start site for AXMI-009 at nucleotide 64 of SEQ LD NO: 19 generates the amino acid sequence provided as SEQ LD NO:24.
- AXMI-014 is provided as SEQ LD NOS:25 and 26, and the amino acid sequence of the predicted AMXI-008 protein is provided as SEQ LD NO:27.
- An alternate start site for AXMI-014 at nucleotide 136 of SEQ ID NO:25 generates the amino acid sequence provided as SEQ LD NO:29.
- Figure 1 shows an alignment of AXMI-004 with several endotoxins. Blast searches identify crylCa as having the strongest block of homology, with an overall sequence identity in the toxic domain of 43% (see Table 1).
- FIG. 2 shows an alignment of AXMI-006 with several endotoxins.
- Blast searches identify cry4Aa as having the strongest block of homology, though alignment of AMXI-006 protein (SEQ ID NO: 7) to a large set of endotoxin proteins shows that the most homologous protein is crylOAa.
- the overall amino acid identity of crylOAa to AXMI-006 is 25% (see Table 2).
- Inspection of the amino acid sequence of AXMI-006 suggests that it does not contain a C-terminal non-toxic domain as is present in several endotoxin families.
- the alignment reflects the amino acid identity present solely in the toxin domains (see Table 2, column three). This 'trimmed' alignment is shown in Figure 2.
- AXMI-007 though alignment of AMXI-007 protein (SEQ ID NO:9) to a large set of endotoxin proteins shows that the most homologous protein is crylOAa.
- the overall amino acid identity of crylOAa to AXMI-007 is 25% (see Table 3).
- Inspection of the amino acid sequence of AXMI-007 suggests that it does not contain a C-terminal non- toxic domain as is present in several endotoxin families.
- the alignment reflects the amino acid identify present solely in the toxin domains (see Table 3, column three). This 'trimmed' alignment is shown in Figure 3.
- cry40Aa As having the strongest block of homology to AXMI-008, and alignment of AMXI-008 protein (SEQ LD NO: 14) to a large set of endotoxin proteins shows that the most homologous protein is cry40Aa.
- the overall amino acid identity of cry40Aa to AXMI-008 is 66% (see Table 4). Inspection of the amino acid sequence of AXMI-008 suggests that it does not contain a C-terminal non- toxic domain as is present in several endotoxin families. By removing this C-terminal protein of the toxins from the alignment, the alignment reflects the amino acid identify present solely in the toxin domains (see Table 4, column three). This 'trimmed' alignment is shown in Figure 4.
- the open reading frame immediately downstream (3 ⁇ to the AXMI-008 coding region has homology to known endotoxin-related proteins.
- Blast searches identify aybun3orf2 (the downstream orf of cry40Aa) as having the strongest block of homology.
- aybun3orf2 the downstream orf of cry40Aa
- Several other orf-2 like proteins are present in databases, and an alignment of AMXI-008-orf2 protein (SEQ ID NO:18) to a set of these proteins is shown in Figure 5. These proteins also share homology to the C-terminal non-toxic domain of cr ⁇ 4Aa and cr ⁇ 4Ba.
- the overall amino acid identity of AXMI-8-orf2 to cry40Aaorf2 is 86% (see Table 5).
- cryBAa As having the strongest block of homology to AXMI-009, and alignment of AMXI-009 protein (SEQ LD NO:20) to a large set of endotoxin proteins shows that the most homologous proteins are cry3Ba and cryl6Aa.
- the overall amino acid identity of cry3Ba and cryl6Aa to AXMI-009 is 26% (see Table 6).
- Inspection of the amino acid sequence of AXMI-009 suggests that it does not contain a C-terminal non-toxic domain as is present in several endotoxin families.
- the alignment reflects the amino acid identify present solely in the toxin domains (see Table 6, column three). This 'trimmed' alignment is shown in Figure 6.
- cry40Aa As having the strongest block of homology to AXMI-014, and alignment of AMXI-0014 protein (SEQ ID NO:27) to a large set of endotoxin proteins shows that the most homologous protein is cry40Aa.
- the overall amino acid identity of cry40Aa to AXMI-014 is 55% (see Table 7). Inspection of the amino acid sequence of AXMI-014 suggests that it does not contain a C-terminal non- toxic domain as is present in several endotoxin families. By removing this C-terminal protein of the toxins from the alignment, the alignment reflects the amino acid identify present solely in the toxin domains (see Table 7, column three). This 'trimmed' alignment is shown in Figure 7. Table 7. Amino Acid Identity of AXMI-014 with Exemplary Endotoxin
- the ability of a pesticidal protein to act as a pesticide upon a pest is often assessed in a number of ways.
- One way well known in the art is to perform a feeding assay, hi such a feeding assay, one exposes the pest to a sample containing either compounds to be tested, or control samples. Often this is performed by placing the material to be tested, or a suitable dilution of such material, onto a material that the pest will ingest, such as an artificial diet.
- the material to be tested may be composed of a liquid, solid, or slurry. The material to be tested may be placed upon the surface and then allowed to dry. Alternatively, the material to be tested may be mixed with a molten artificial diet, then dispensed into the assay chamber.
- the assay chamber may be, for example, a cup, a dish, or a well of a microtiter plate.
- Assays for sucking pests may involve separating the test material from the insect by a partition, ideally a portion that can be pierced by the sucking mouthparts of the sucking insect, to allow ingestion of the test material.
- the test material is mixed with a feeding stimulant, such as sucrose, to promote ingestion of the test compound.
- test material can include microinjection of the test material into the mouth, or gut of the pest, as well as development of transgenic plants, followed by test of the ability of the pest to feed upon the transgenic plant.
- Plant testing may involve isolation of the plant parts normally consumed, for example, small cages attached to a leaf, or isolation of entire plants in cages containing insects.
- AXMI-006 was cloned into a vector for E. coli expression as follows.
- pAX480 contains the kanamycin resistance gene for selection of transformants, and the tac promoter which is inducible by ff TG for regulated protein expression.
- pAX480 was modified by inserting a DNA segment encoding a 6xHis-tag region immediately upstream of the insert cloning region, such that resulting clones contain a 6xHis-tag at the N-terminus of the expressed protein.
- Methods for expressing proteins with 6xHis-tag fusions, and their use for purification and analysis of protein expression are well known in the art.
- the coding sequence for AXMI-006 was PCR-amplified using Pfu UltraTM
- a single colony of pAX906 in BL21 was inoculated into LB media supplemented with kanamycin and grown for several hours at 37°C with vigorous agitation. These cultures were grown to an OD 60 o ranging from 0.6-0.8; then protein production was induced by addition of 0.1 mM LPTG. Cultures were grown under inducing conditions for 3 hours, and then the cells were pelleted by centrifugation and resuspended in PBS. Cells were sonicated using a Misonix Sonicator 3000 for a total of 30 seconds using 10-second sonication intervals and incubation on ice for one minute.
- Bioassays of sonicated pAX906 cultures were performed using artificial diet (Multiple Species Diet, Southland Products, Lake Village, Arkansas). Bioassays were carried out by applying sonicated pAX906 cells, or cells of the E.coli strain as a control, to the diet surface and allowing the diet surface to dry. Bioassays were performed in 24-well tissue culture plates. The bioassays were held in the dark at 25° C and 65% relative humidity. Trays were sealed with Breathe Easy Sealing Tape (Diversified Biotech, Boston, MA). Results were recorded at 5 days. Table 8. Bioassay of AXMI-006 on Spodoptera frugiperda
- Stunting is defined reduced insect size, and severally reduced larval feeding. Stunted insects may also demonstrate avoidance of the treated diet compared to the untreated diet.
- Escherichia coli strains containing either pAX008, pAX009 or pAX-014, as well as a culture of untransformed Escherichia coli were grown in 2 ml of LB Broth (Luria-Bertani Broth, Becton Dickinson & Company, Sparks, Md.) for 24 hours at 37 c C with agitation at 250 rpm. Plasmid-containing strains were grown in grown in LB containing the appropriate antibiotic to select for maintenance of the plasmid in E. coli.
- Bioassays were performed using artificial diet (Multiple Species Diet, Southland Products, Lake Village, Arkansas) in 24 well tissue culture plates. Bioassays were carried out by applying the Escherichia coli culture containing pAX- 014 to the diet surface and allowing the diet surface to dry. The strains were applied as whole cultures to the diet at a concentration of 40 ⁇ l of culture per well. The bioassays were held in the dark at 25° C and 65 % relative humidity. Trays were sealed with Breathe Easy Sealing Tape (Diversified Biotech, Boston, MA). Results were recorded at 5 days. Table 10. Pesticidal Activity on T. ni
- Example 12 Expression of Delta-Endotoxin Genes in Bacillus AXMI-004, AXMI-006, AXMI-007, AXMI-008, and AXMI-009 were amplified by PCR from the clones from Example 4, and cloned into the Bacillus Expression vector pAX916 by methods well known in the art.
- AXMI-004 the resulting clone was designated pAX920.
- AXMI-006 the resulting clone was designated pAX921.
- AXMI-007 the resulting clone was designated pAX919.
- AXMI-008 the resulting clone was designated pAX922.
- the resulting clone was designated pAX917.
- the resulting clones expressed the relevant protein when transformed into cells of a cry(-) Bacillus thuringiensis strain.
- the Bacillus strains containing delta-endotoxin genes and expressing the delta-endotoxin proteins may be cultured on a variety of conventional growth media.
- a Bacillus strain containing the desired gene was grown in CYS media (10 g/1 Bacto-casitone; 3 g/1 yeast extract; 6 g/1 KH 2 PO 4 ; 14 g/1 K 2 HPO 4 ; 0.5 mM MgSO 4 ; 0.05 mM MnCl 2 ; 0.05 mM FeSO 4 ), until spomlation was evident by microscopic examination. Samples were prepared, and delta-endotoxin proteins were tested for insecticidal activity in bioassays against important insect pests.
- CYS media 10 g/1 Bacto-casitone; 3 g/1 yeast extract; 6 g/1 KH 2 PO 4 ; 14 g/1 K 2 HPO 4 ; 0.5 mM MgSO 4 ; 0.05 mM MnCl 2 ; 0.05 mM FeSO 4 .
- the CYS mix should be pH 7, if adjustment is necessary. NaOH or HCI are preferred.
- the media is then autoclaved and 100 ml of 10X filtered glucose is added after autoclaving. If the resultant solution is cloudy it can be stirred at room temperature to clear.
- Example 13 N-terminal Amino Acid Sequence of AXMI-004 Expressed in Bacillus
- AXMI-004 expressed in Bacillus showed that the protein product detected in these cultures may be reduced in size relative to the full-length AXMI-004 protein. Since many endotoxin proteins are cleaved at the N-te ⁇ ninus after expression in Bacillus, we determined the N-terminus of the AXMI-004 protein resulting from Bacillus expression. Protein samples from AXMI-004 were separated on PAGE gels, and the protein transferred to PVDF membrane by methods known in the art. The protein band corresponding to AXMI-004 was excised. The N-terminal amino acid sequence of this protein was determined by serial Edman degradation as known in the art. The sequence obtained was as follows:
- AXMI-004 (SEQ LD NO:3) demonstrates that this amino sequence results from internal cleavage of the AXMI-004 after expression in Bacillus, resulting in a protein with an N-terminus corresponding to amino acid 28 of SEQ LD NO:3 (disclosed as SEQ ID NO:5).
- Insecticidal activity of AXMI-004 was established utilizing accepted bioassay procedures using a sporulated Bacillus cell culture lysate expressing AXMI-004.
- the Bacillus culture was grown in 50 ml CYS media for both standard bioassay and LC 50 bioassays. The cultures were then grown for 2 to 3 days at 30°C, 250 rpm until the cells were sporulated. Spomlation was determined by examining microscopically for the presence of spores.
- AXMI-004 protein samples were prepared by centrifugation of the sporulated cultures at 12,000 x g for 10 min.
- the pellet was collected and resuspended in 4 ml 20 mM Tris-HCl, pH 8.0. The suspension was sonicated for 20 seconds (at top power using a micro probe) while placing the tube on ice.
- the protein concentration of the sample was determined by electrophoresis on an SDS 4-20% gradient acrylamide gel along with a known quantity of bovine serum albumin (BSA) ( Figure 8).
- BSA bovine serum albumin
- the concentration of AXMI-004 was determined to be 0.4 ⁇ g/ul.
- AXMI-004 insecticidal activity was tested using a surface treatment bioassay with artificial diet (Multiple Species diet, Southland Products, Lake Village, Arkansas) prepared as known in the art.
- Bioassays were carried out by applying the Bacillus culture expressing AXMI-004 to the diet surface and allowing the surface to air-dry. Standard bioassays utilized five eggs per well and LC50 bioassays utilized ten neonate insect larvae per well. The eggs or larvae were applied using a fine tip paintbrush. Standard surface bioassays were carried out in 24 well tissue culture plates. 40ul of each sample was applied to each well. Since each well has a surface area of 2 cm 2 (plate source), a 40 ⁇ l cell lysate sample contained approximately 0.4 ug/ul AXMI-004.
- Bioassays where the LC 5 o was determined were done in 48 well tissue culture plates, each well representing a surface area of 1 cm (source) using approximately 20ul of 0.4 ⁇ g/ul AXMI-004 per well. The final amount of AXMI-004 protein in each bioassay was approximately 8 ⁇ g/cm 2 .
- Bioassay trays were sealed with Breathe Easy Sealing Tape (Diversified Biotech, Boston MA). Control samples included media only samples, and wells that were not treated with samples. Bioassays were then held for five days in the dark at 25° C and 65% relative humidity and results recorded.
- AXMI-004 showed strong insecticidal activity (100%. mortality) against Ostrinia nubilalis and Heliothis virescens. AXMI-004 also showed insecticidal activity of 50-75% mortality against Pectinophora gossypiella. A concentration of 43 ⁇ g/cm 2 AXMI-004 gave 70% mortality against Pectinophora gossypiella. AXMI-004 severely stunted the growth of Agrotis ipsilon, Heliothis zea, and Spodoptera frugiperda.
- the LC 50 of AXMI-004 protein on Ostrinia nubilalis and Heliothis virescens larvae were determined by testing a range of AXMI-004 protein concentrations in insect bioassays, and applying these protein samples to the surface of insect diet. Mortality was recorded at each protein concentration and analyzed using a Probit analysis program. Results were significant at the 95% confidence interval. Since assays were performed by surface contamination, LC 5 QS were determined assuming that the entire protein sample remained at the surface during the assay, with little diffusion below the level ingested by the insects. Thus, the values determined may somewhat underestimate the toxicity of the AXMI-004 protein on the tested insects.
- Example 16 Ouantitation of AXMI-004. AXMI-006. AXMI-007, and AXMI-009 Insecticidal Activity against Lygus lineolaris
- Bacterial lysates were prepared by growing the Bacillus in 50 ml of CYS media for 60 hours. The Bacillus culture was then centrifuged at 12,000 rpm for ten minutes and the supernatant discarded. The pellet was resuspended in 5 ml of 20 mM Tris HCl atpH 8.
- Bioassays were performed by cutting both the tip and the cap off an Eppendorf tube to form a feeding chamber.
- the insecticidal protein or control was presented to the insect in a solution that was poured into the cap and covered with parafilm (Pechiney Plastic Packaging, Chicago IL) that the insect could pierce upon feeding.
- the Eppendorf tube was placed back on the cap top down and 1 st or 2 nd instar Lygus nymphs were placed into the Eppendorf chamber with a fine tip brash.
- the cut Eppendorf tube tip was sealed with parafilm creating an assay chamber.
- the resultant assay chamber was incubated at ambient temperature cap side down.
- Insecticidal proteins were tested in a solution of 15% glucose at a concentration of 6.6 ug/ml. Table 14. Insecticidal Activity on Lygus lineolaris
- Samples of AXMI-008 were prepared from a culture of a Bacillus strain containing pAX 922.
- the bioassay sample was prepared by growing a culture in CYS media for 4 days, until spomlation. The sample was centrifuged at 10,000 rpm for 10 minutes and the supernatant discarded. The pellet was washed in 20mM Tris pH 8 and spun at 10,000 rpm for 10 minutes. The supernatant was discarded and the pellet resuspended in 3 mis of 50 mM Sodium Citrate and 25 mM Sodium Chloride with 2mM DTT at pH 4. The sample was incubated at 37° C for 1 hour. After incubation the sample was spun at 13,000 rpm for 10 minutes and the supernatant discarded. The pellet was resuspended in 50 mM Sodium Citrate and 25 mM Sodium Chloride at pH 4.
- Bioassays of samples on Tenebrio molitor were performed on an artificial diet (Southern Com Rootworm Diet, Bioserv, Frenchtown, NJ, #F9757B) in 24 well tissue culture plates.
- the sample was applied as a surface treatment with a concentration of Axmi008 at 8 ug/cm 2 and allowed to air dry.
- the insects were applied using a fine tip brash.
- Bioassay trays were sealed with Breathe Easy Sealing Tape (Diversified Biotech, Boston, MA) and incubated without light at 65% relative humidity, 25° C. for seven days and results recorded.
- Bioassays of AXMI-009 protein preparations were performed by pipetting 40 ⁇ l of insoluble fraction onto a 2 cm 2 diet surface for a final total protein concentration of 8 ⁇ g/cm 2 .
- Diabrotica virgifera virgifera and Diabrotica undecirnpunctata were tested using Southern Com Rootworm Diet (Bioserv, Frenchtown, NJ, #F9757B).
- Bioassays were carried out by applying the Bacillus culture expressing AXMI-009 to the diet surface and allowing the diet surface to dry. Bioassays were performed in 24 well tissue culture plates. Standard bioassays utilized 25 eggs per well. The eggs were applied in a solution containing 0.1% agar and 30 ug/ml nystatin.
- the delta-endotoxin coding region DNA is operably connected with appropriate promoter and terminator sequences for expression in plants.
- appropriate promoter and terminator sequences for expression in plants.
- Such sequences are well known in the art and may include the rice actin promoter or maize ubiquitin promoter for expression in monocots, the Arabidopsis UBQ3 promoter or CaMV 35S promoter for expression in dicots, and the nos or Pinll terminators.
- Techniques for producing and confirming promoter -. gene - tenninator constructs also are well known in the art.
- the plant expression cassettes described above are combined with an appropriate plant selectable marker to aid in the selections of transformed cells and tissues, and ligated into plant transfonnation vectors.
- These may include binary vectors from Agrobacterium-mediated transformation or simple plasmid vectors for aerosol or biolistic transformation.
- Maize ears are collected 8-12 days after pollination. Embryos are isolated from the ears, and those embryos 0.8-1.5 mm in size are used for transformation. Embryos are plated scutellum side-up on a suitable incubation media, such as
- DN62A5S media (3.98 g/L N6 Salts; 1 mL/L (of lOOOx Stock) N6 Vitamins; 800 mg/L L- Asparagine; 100 mg/L Myo-inositol; 1.4 g/L L-Proline; 100 mg/L Casaminoacids; 50 g/L sucrose; 1 mL/L (of 1 mg/mL Stock) 2,4-D), and incubated overnight at 25 °C in the dark.
- the resulting explants are transferred to mesh squares (30-40 per plate), transferred onto osmotic media for 30-45 minutes, then transferred to a beaming plate (see, for example, PCT Publication No. WO/0138514 and U.S. Patent No. 5,240,842).
- DNA constructs designed to express the delta-endotoxin in plant cells are accelerated into plant tissue using an aerosol beam accelerator, using conditions essentially as described in PCT Publication No. WO/0138514. After beaming, embryos are incubated for 30 min on osmotic media, then placed onto incubation media overnight at 25 °C in the dark. To avoid unduly damaging beamed explants, they are incubated for at least 24 hours prior to transfer to recovery media. Embryos are then spread onto recovery period media, for 5 days, 25°C in the dark, then transferred to a selection media. Explants are incubated in selection media for up to eight weeks, depending on the nature and characteristics of the particular selection utilized.
- the resulting callus is transferred to embryo maturation media, until the formation of mature somatic embryos is observed.
- the resulting mature somatic embryos are then placed under low light, and the process of regeneration is initiated by methods known in the art.
- the resulting shoots are allowed to root on rooting media, and the resulting plants are transferred to nursery pots and propagated as transgenic plants.
- Ears are collected 8-12 days after pollination. Embryos are isolated from the ears, and those embryos 0.8-1.5 mm in size are used for transformation. Embryos are plated scutellum side-up on a suitable incubation media, and incubated overnight at 25°C in the dark. However, it is not necessary per se to incubate the embryos overnight. Embryos are contacted with an Agrobacterium strain containing the appropriate vectors for Ti plasmid mediated transfer for 5-10 min, and then plated onto co-cultivation media for 3 days (25°C in the dark). After co-cultivation, explants are transferred to recovery period media for five days (at 25°C in the dark).
- Explants are incubated in selection media for up to eight weeks, depending on the nature and characteristics of the particular selection utilized. After the selection period, the resulting callus is transferred to embryo maturation media, until the formation of mature somatic embryos is observed. The resulting mature somatic embryos are then placed under low light, and the process of regeneration is initiated as known in the art. The resulting shoots are allowed to root on rooting media, and the resulting plants are transferred to nursery pots and propagated as transgenic plants.
- AXMI-004 has pesticidal activity against pests including Ostrinia nubilalis, Agrotis ipsilon, Heliothis zea, Spodoptera frugiperda, Heliothis virescens, Pectinophora gossypiella, Manduca Sexta, Trichoplasia ni, and Lygus lineolaris.
- AXMI-006 has pesticidal activity against pests including Heliothis virescens, Spodoptera frugiperda, and Lygus lineolaris.
- AXMI- 007 has pesticidal activity against pests including Lygus lineolaris.
- AXMI-008 has pesticidal activity against pests including Tenebrio molitor and Trichoplusia ni.
- AXMI-009 has pesticidal activity against pests including Lygus lineolaris, Trichoplusia ni, Diabrotica virgifera virgifera, and Diabrotica undecirnpunctata.
- AXMI-014 has pesticidal activity against pests including Trichoplusia ni.
Abstract
Description
Claims
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BRPI0407711-3A BRPI0407711A (en) | 2003-02-20 | 2004-02-20 | delta-endotoxin genes and their methods for their uses |
DE602004017282T DE602004017282D1 (en) | 2003-02-20 | 2004-02-20 | DELTA ENDOTOXIN GENE AND METHOD OF USE THEREOF |
CN2008101360920A CN101328484B (en) | 2003-02-20 | 2004-02-20 | Delta-endotoxin genes and methods for their use |
EP04713453A EP1594966B1 (en) | 2003-02-20 | 2004-02-20 | Delta-endotoxin genes and methods for their use |
CA2516349A CA2516349C (en) | 2003-02-20 | 2004-02-20 | Delta-endotoxin genes and methods for their use |
ES04713453T ES2316963T3 (en) | 2003-02-20 | 2004-02-20 | DELTA-ENTOTOXINE GENES AND METHODS FOR USE. |
CNB2004800075638A CN100413966C (en) | 2003-02-20 | 2004-02-20 | Delta-endotoxin genes and methods for their use |
AU2004213873A AU2004213873C1 (en) | 2003-02-20 | 2004-02-20 | Delta-endotoxin genes and methods for their use |
NZ541929A NZ541929A (en) | 2003-02-20 | 2004-02-20 | Compositions for generating or detecting altered or improved delta-endotoxin or delta-endotoxin-associated proteins that have pesticidal activity in products or organisms |
AU2009201315A AU2009201315B2 (en) | 2003-02-20 | 2009-03-27 | Delta-endotoxin genes and methods for their use |
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US10/783,417 US20040216186A1 (en) | 2003-02-20 | 2004-02-19 | AXMI-006, a delta-endotoxin gene and methods for its use |
US10/782,141 | 2004-02-19 | ||
US10/782,570 | 2004-02-19 | ||
US10/783,417 | 2004-02-19 | ||
US10/782,096 | 2004-02-19 | ||
US10/782,570 US20040210965A1 (en) | 2003-02-20 | 2004-02-19 | AXMI-007, a delta-endotoxin gene and methods for its use |
US10/782,020 | 2004-02-19 | ||
US10/782,141 US20040197917A1 (en) | 2003-02-20 | 2004-02-19 | AXMI-014, delta-endotoxin gene and methods for its use |
US10/782,020 US7355099B2 (en) | 2003-02-20 | 2004-02-19 | AXMI-004, a delta-endotoxin gene and methods for its use |
US10/781,979 US7351881B2 (en) | 2003-02-20 | 2004-02-19 | AXMI-008, a delta-endotoxin gene and methods for its use |
US10/782,096 US20040210964A1 (en) | 2003-02-20 | 2004-02-19 | AXMI-009, a delta-endotoxin gene and methods for its use |
US10/781,979 | 2004-02-19 |
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AU2009201315B2 (en) | 2012-11-15 |
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CN1761753A (en) | 2006-04-19 |
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CN101328484A (en) | 2008-12-24 |
CA2843744A1 (en) | 2004-09-02 |
AU2004213873B2 (en) | 2009-02-12 |
CN100413966C (en) | 2008-08-27 |
WO2004074462A3 (en) | 2005-06-23 |
AU2009201315A1 (en) | 2009-04-23 |
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CN102586285A (en) | 2012-07-18 |
AU2004213873C1 (en) | 2009-08-13 |
CN101328484B (en) | 2012-08-08 |
NZ541929A (en) | 2008-04-30 |
EP1947184B1 (en) | 2011-03-30 |
EP1594966B1 (en) | 2008-10-22 |
NZ570682A (en) | 2009-08-28 |
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