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Journal of Biotechnology journal homepage: www.elsevier.com/locate/jbiotec

Genome Announcement

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Complete genome sequence of Bacillus thuringiensis serovar galleriae strain HD-29, a typical strain of commercial biopesticide

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Lei Zhu, Jin-Shui Zheng, Qiu-Ling Gao, Yue-Ying Wang, Dong-Hai Peng, Li-Fang Ruan, Ming Sun ∗ State Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, Wuhan 430070, Hubei, People’s Republic of China

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a b s t r a c t

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Article history: Received 17 December 2014 Accepted 22 December 2014 Available online xxx

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Keywords: Bacillus thuringiensis Complete genome Bt biopesticide Lepidoptera

Bacillus thuringiensis serovar galleriae is highly toxic to Lepidoptera insect pests, and has been widely used as Bt biopesticide in many countries. Here we reported the complete genome of strain HD-29, a standard serotype strain in galleriae serovariety. More than previous work reported, it harbors ten plasmids, and three large ones carry eight insecticidal protein genes (cry1Aa, cry1Ac, cry1Ca, cry1Da, cry1Ia, cry2Ab, cry9Ea and vip3Aa) and an intact zwittermicin A biosynthetic gene cluster. © 2014 Published by Elsevier B.V.

Bacillus thuringiensis produces insecticidal parasporal crystal proteins and is ubiquitous in natural environment (Schnepf et al., 1998; van Frankenhuyzen, 2009). Thus, tens of thousands of strains were isolated to find the most highly insecticidal toxic ones for Bt biopesticide commercialization, using various insect pest control fields (Roh et al., 2007). B. thuringiensis serovar galleriae (serotype H5a, 5b, Btg) strains are used as successful Bt biopesticide in many countries for a long time, such as “Entobacterin” in China and Russia (Chen and Fan, 1989; Kozlov et al., 1975; Shvetsova, 1962) and “Spicturin” in India (Shah, 1999). It particularly targeted to American Bollworm (Hellicoverpa armigera), Pink bollworm (Pectinophera species), spotted bollworm (Erias insulana), diamond back moth (Plutela xylostella (Linnaeus)) and other vegetable pests such as Colorado potato beetle (Leptinotarsa decemlineota (Say)) and forest insects (http://www.ncipm.org.in/bacillus-thuringiensisgalleria.htm). Herein, we present on the complete genome sequence of B. thuringiensis serovar galleriae strain NRRL HD-29, isolated from Dendrolimus sibericus in Czechoslovakia. It is a standard serotype strain in this species with a toxicity to Lepidoptera insect larvae (Fagundes et al., 2011). The HD-29 genome sequence will provide valuable information which will contribute to deeper understanding of entomopathogenicity in B. thuringiensis. The genome sequencing of B. thuringiensis strain HD-29 was performed on an Illumina HiSeq2500 instrument, using a 500 bp

∗ Corresponding author. Tel.: +86 27 87283455; fax: +86 27 87280670. E-mail address: [email protected] (M. Sun).

paired-end genomic library and 150 nucleotide (nt) length reads. The de novo assembly was performed by ABySS alignment tool version 1.3.7 (Simpson et al., 2009). Based on 8,160,035 pairs of the filtered reads, a total 264 contigs (>500 bp) were obtained by preliminarily assembly and the coverage is 389 folds. After using the completed B. thuringiensis genomes released in NCBI as references to arrange the contigs, most of the gaps between the contigs were rapidly closed using reads analysis and confirmed by PCR amplification. The genome annotation was performed by NCBI Prokaryotic Genome Automatic Annotation Pipeline (PGAAP, http://www.ncbi.nlm.nih.gov/books/NBK174280/). And the insecticidal protein genes were predicted by BtToxin scanner reported in our previous work (Ye et al., 2012). The total length of the HD-29 genome is 6,742,233 bp, with 34.9% average G+C content. Interestingly, the previous work showed that strain HD-29 harbors four plasmids (Fagundes et al., 2011), however, the assembly result showed that it includes a circular chromosome and ten plasmids: pBMB426 (426,282 bp), pBMB267 (267,359 bp), pBMB126 (126,898 bp), pBMB71 (71,373 bp), pBMB55 (55,460 bp), pBMB47 (46,979 bp), pBMBLin15 (14,749 bp), pBMB12 (12,866 bp), pBMB10 (10,656 bp) and pBMB8 (8423 bp) (Table 1). The G+C contents of these plasmids are from 29.6% to 39.9%, respectively. The annotation showed that the genome of strain HD-29 totally contains 6904 genes. The chromosome harbors 5890 genes, 42 rRNA and 114 tRNA genes (Table 1). Plasmid encodes 1014 genes, a tRNA gene and eight insecticidal protein genes. The comparative genomics analysis showed that large plasmid pBMB426 encodes two insecticidal parasporal protein genes

http://dx.doi.org/10.1016/j.jbiotec.2014.12.021 0168-1656/© 2014 Published by Elsevier B.V.

Please cite this article in press as: Zhu, L., et al., Complete genome sequence of Bacillus thuringiensis serovar galleriae strain HD-29, a typical strain of commercial biopesticide. J. Biotechnol. (2014), http://dx.doi.org/10.1016/j.jbiotec.2014.12.021

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2 Table 1 Genome features of Bacillus thuringiensis HD-29. Features

Length (bp)

G+C content (%)

No. of genes

No. of tRNAs

No. of rRNAs

No. of insecticidal protein genes

Accession numbers

Chromosome Plasmid pBMB426 Plasmid pBMB267 Plasmid pBMB126 Plasmid pBMB71 Plasmid pBMB55 Plasmid pBMB47 Plasmid pBMBLin15 Plasmid pBMB12 Plasmid pBMB10 Plasmid pBMB8

5,701,188 426,282 267,359 126,898 71,373 55,460 46,979 14,749 12,866 10,656 8423

35.3 32.9 33.2 31.7 32.2 34.9 35.4 39.9 31.6 33.8 29.6

5890 354 244 139 85 57 68 24 20 13 10

114 1 – – – – – – – – –

42 – – – – – – – – – –

– 2 5 1 – – – – – – –

CP010089 CP010090 CP010091 CP010092 CP010093 CP010094 CP010095 CP010096 CP010097 CP010098 CP010099

Total

6,742,233

34.9

6904

115

42

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(cry1Ca and cry1Da), and a intact zwittermicin A biosynthetic gene cluster, which was proved to have the ability to potentiate the insecticidal activity of the protein toxins produced by B. thuringiensis and a broad-spectrum antimicrobial activity (Broderick et al., 2000; Luo et al., 2011). Plasmid pBMB267 showed 99% homology with the large plasmid pCT281 in strain CT-43 (He et al., 2011) and encodes five insecticidal protein genes (cry1Aa, cry1Ia, cry2Ab, cry9Ea and vip3Aa). Plasmid pBMB126 encodes an insecticidal protein gene cry1Ac. And pBMB47 showed 99% homology with Bacillus phage Waukesha92 (Sauder et al., 2014). According to the insecticidal activity of B. thuringiensis crystal proteins (van Frankenhuyzen, 2009), besides the larvaes of Lepidoptera, the Cry proteins from HD-29 also are active to Coleoptera, Diptera (Cry1Aa, Cry1Ac, Cry1Ca, Cry1Da and Cry1Ia) and Hemiptera (Cry2Ab). All these toxins bring a wide insecticidal spectrum to strain HD-29. The availability of the HD-29 genome facilitates the understanding of toxin gene diversity and regulation, and is helpful for better usage and modification of this commercial strain in the insect pest control.

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Nucleotide sequence accession number

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This complete genome has been deposited at DDBJ/EMBL/ GenBank under the accession number CP010089–CP010099. The strain is available from the U.S. Department of Agriculture’s Agricultural Research Service (ARS) in Peoria under accession HD-29, Bacillus Genetic Stock Center (Columbus, USA) under accession 4G5, or Prof. Ming Sun (State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, PR China).

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Acknowledgements

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We thank Dr. D. Zeigler in BGSC provide the B. thuringiensis strain HD-29. This work was supported by grants from the 106 Q3 National High Technology Research and Development Program 107 (863) of China (2011AA10A203), China 948 Program of Ministry of 105

Agriculture (G25), the National Basic Research Program (973) of China (2009CB118902), the National Natural Science Foundation of China (31170047 and 31171901).

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Please cite this article in press as: Zhu, L., et al., Complete genome sequence of Bacillus thuringiensis serovar galleriae strain HD-29, a typical strain of commercial biopesticide. J. Biotechnol. (2014), http://dx.doi.org/10.1016/j.jbiotec.2014.12.021

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Complete genome sequence of Bacillus thuringiensis serovar galleriae strain HD-29, a typical strain of commercial biopesticide.

Bacillus thuringiensis serovar galleriae is highly toxic to Lepidoptera insect pests, and has been widely used as Bt biopesticide in many countries. H...
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