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Pesticidal genes from brevibacillus and methods for their use

Inactive Publication Date: 2010-06-24
ATHENIX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]Compositions and methods for conferring insect resistance to bacteria, plants, plant cells, tissues and seeds are provided. Compositions include nucleic acid molecules encoding sequences for Brevibacillus-derived delta-endotoxin polypeptides, vectors comprising those nucleic acid molecules, and host cells comprising the vectors. Compositions also include the polypeptide sequences of the endotoxin, and antibodies to those polypep

Problems solved by technology

These results discouraged the use of B. laterosporus in biological control.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Identification of axmi-134 from Brevibacillus Strain ATX15530

[0098]The complete gene sequence was identified as follows:

[0099]Preparation of extrachromosomal DNA from the strain. Extrachromosomal DNA contains a mixture of some or all of the following: plasmids of various size; phage chromosomes; genomic DNA fragments not separated by the purification protocol; other uncharacterized extrachromosomal molecules.

[0100]Mechanical or enzymatic shearing of the extrachromosomal DNA to generate size-distributed fragments.

[0101]Sequencing of the fragmented DNA by high-throughput pyrosequencing methods. Identification of putative toxin genes via homology and / or other computational analyses.

[0102]When required, sequence finishing of the gene of interest by one of several PCR or cloning strategies (e.g. TAIL-PCR).

The sequence of the axmi-134 open reading frame is provided herein as SEQ ID NO:1 and encodes the AXMI-134 protein (SEQ ID NO: 2. Comparison of AXMI-134 vs protein databases identified ...

example 2

Heterologous Expression of AXMI-134

[0103]The complete ORF of axmi-134 (3.82 kb which encodes 1272 amino acid long protein) was amplified from Brevibacillus strain ATX15530 using appropriate primers. It was cloned into an E. coli expression vector based on pRSF1b (to give pAX5479) and a Bacillus vector based on pAX916 (to give pAX5481). The resulting clones were confirmed by restriction analysis and finally, by complete sequencing of the cloned gene. For expression in E. coli, BL21*DE3 was transformed with pAX5479. Single colony was inoculated in LB supplemented with kanamycin and grown overnight at 37° C. The following day, fresh medium was inoculated in duplicate with 1% of overnight culture and grown at 37° C. to logarithmic phase. Subsequently, cultures were induced with 1 mM IPTG for 3 hours at 37° C. or overnight at 20° C. Each cell pellet was suspended in 50 mM sodium carbonate buffer, pH 10.5 supplemented with 1 mM DTT and sonicated. Analysis by SDS-PAGE detected expression o...

example 3

Pesticidal Activity of AXMI-134

[0104]Soluble extracts containing Axmi134 were tested separately in insect assays with appropriate controls at an approximate concentration of 200 ng / ul. In this assay, a 5 day read of the plates showed AXMI-134 to have pesticidal activity on diamondback moth (DBM) and Colorado potato beetle (CPB) (see Table 2 below). Trypsin treatment of AXMI-134 resulted in strong mortality and stunting on DBM and CPB, (Table 2) respectively. Table 1 shows a description of the scoring assignments used herein

TABLE 1Description of Scoring SystemScoreDescription0no effect observed1mild non-uniform stunting2moderate non-uniform stunting3moderate to severe uniform stunting4mortality (5complete mortality

TABLE 2Activity of AXMI134 on Diamondback moth (Plutella xylostella)and Colorado potato beetle (Leptinotarsa decemlineata).PestAXMI134AXMI134 (Trypsin treated)Diamondback4 -Uniform stunt,4 - Uniform stunt,Moth60% mortality80% mortalityColorado3 - Light feeding on leaf5 - Li...

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Abstract

Compositions and methods for conferring insecticidal activity to bacteria, plants, plant cells, tissues and seeds are provided. Compositions including a coding sequence for a Brevibacillus-derived delta-endotoxin polypeptide are provided. The coding sequences can be used in DNA constructs or expression cassettes for transformation and expression in plants and bacteria. Compositions also include transformed bacteria, plants, plant cells, tissues, and seeds. In particular, isolated delta-endotoxin nucleic acid molecules are provided. Additionally, amino acid sequences corresponding to the polynucleotides are encompassed, and antibodies specifically binding to those amino acid sequences. In particular, the present invention provides for isolated nucleic acid molecules having nucleotide sequences encoding the amino acid sequence shown in SEQ ID NO:2, 4, 7, or 10, or the nucleotide sequence set forth in SEQ ID NO:1, 3, 5, 6, 8, 9, 11, 12, 13, 14, or 15, as well as variants and fragments thereof.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application claims the benefit of U.S. Provisional Application Ser. No. 61 / 139,947, filed Dec. 22, 2008, the contents of which are herein incorporated by reference in their entirety.REFERENCE TO SEQUENCE LISTING SUBMITTED AS A TEXT FILE VIA EFS-WEB[0002]The official copy of the sequence listing is submitted concurrently with the specification as an ASCII formatted text file via EFS-Web, with a file name of “383055_SequenceListing.txt”, a creation date of Dec. 16, 2009, and a size of 98 kilobytes. The sequence listing filed via EFS-Web is part of the specification and is hereby incorporated in its entirety by reference herein.FIELD OF THE INVENTION[0003]This invention relates to the field of molecular biology. Provided are novel genes that encode insecticidal proteins. These proteins and the nucleic acid sequences that encode them are useful in preparing insecticidal formulations and in the production of transgenic insect-resistant pla...

Claims

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Application Information

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IPC IPC(8): A01N37/44C07K14/195C07H21/04C12N15/63C12N1/21C12N5/04A01H5/00A01H5/10C07K16/12C12P21/02A01H1/00
CPCC07K14/345C12N15/8286Y02A40/162C07K14/325C07K14/195Y02A40/146
Inventor SAMPSON, KIMBERLY S.TOMSO, DANIEL J.GUO, RONG
Owner ATHENIX
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