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Journal of Biotechnology journal homepage: www.elsevier.com/locate/jbiotec
Genome announcement
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Draft genome sequence of Pantoea agglomerans R190, a producer of antibiotics against phytopathogens and foodborne pathogens
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Jeong-A Lim a , Dong Hwan Lee a , Byoung-Young Kim b , Sunggi Heu a,∗ a b
Microbial Safety Division, National Academy of Agricultural Science, Rural Development Administration, Suwon 441-707, Republic of Korea Business Planning Dept, CHUNLAB INC, Gwanak-gu, Seoul 151-742, Republic of Korea
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Article history: Received 17 July 2014 Accepted 24 July 2014 Available online xxx
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Keywords: Pantoea agglomerans Biocontrol agent Genome analysis
Pantoea agglomerans R190, isolated from an apple orchard, showed antibacterial activity against various spoilage bacteria, including Pectobacterium carotovorum subsp. carotovorum, and foodborne pathogens such as Escherichia coli O157:H7. Here, we report the genome sequence of P. agglomerans R190. This report will raise the value of P. agglomerans as an agent for biocontrol of disease. © 2014 Published by Elsevier B.V.
Pantoea agglomerans (formerly Enterobacter agglomerans, Erwinia herbicola, and Erwinia milletiae) is a Gram-negative bacterium belonging to the Enterobacteriaceae (Rezzonico et al., 2009). The saprophyte P. agglomerans has long been known to be an opportunistic pathogen of plants and humans, however, P. agglomerans has also been focused on as a beneficial bacterium due to its metabolic capabilities including the production of antibiotics such as phenazine, pantocin, herbicolin, and dapdiamide antibiotics (Giddens et al., 2002; Jin et al., 2003; Kamber et al., 2012; Mavrodi et al., 2010; Smith et al., 2013). With these antibacterial activities, several strains of P. agglomerans are being sold commercially to control the pathogenic bacterium Erwinia amylovora, which causes fire blight on apple trees (Johnson and Stockwell, 1998). P. agglomerans R190 (KACC 91765P) was isolated from an apple orchard in Chuncheon, Korea. The strain showed strong antibacterial activity against various spoilage bacteria, including Clavibacter michiganensis, Burkholderia andropogonis, Chryseobacterium balustinum, Dickeya zeae, Pectobacterium carotovorum, and Pseudomonas putida, and against foodborne pathogens such as Salmonella enterica and Escherichia coli O157:H7. The human pathogens Klebsiella pneumoniae and Yersinia enterocolitica have also been controlled by treatment with P. agglomerans R190. Since it has been suggested that P. agglomerans R190 carries a wide range of antibacterial substances, full genome sequencing has been
∗ Corresponding author. Tel.: +82 31 290 0455; fax: +82 31 290 0407. E-mail addresses:
[email protected],
[email protected] (S. Heu).
conducted. Here, we report the genome sequence of P. agglomerans R190. The genomic library of P. agglomerans R190 was sequenced using GS-FLX pyrosequencing, Illumina HiSeq, and PacBio platforms. The generated paired-end sequencing reads (229,894 reads, 12,051,218 reads, and 48,640 reads, respectively) were assembled using the CLC genomics workbench 6.5.1 (CLC bio, Denmark). The contigs and PCR-based long reads were combined through manual curation using CodonCode Aligner 3.7.1 (CodonCode Corp., Dedham, MA, USA). To check errors and dubious regions, the final genome sequence was corrected by remapping with raw reads. The coding sequences (CDSs) were predicted by Glimmer 3.02 (Delcher et al., 2007). tRNAs and rRNAs were identified by tRNA-Scan-SE (Lowe and Eddy, 1997), and HMMER with EzTaxon-e rRNA profiles (Eddy, 1998; Kim et al., 2012). The predicted CDSs were compared to catalytic families (catFams) and National Center for Biotechnology Information (NCBI) clusters of orthologous groups (COGs) by rpsBLAST, and to NCBI reference sequences (RefSeq) and SEED databases by BLASTP for functional annotation (Overbeek et al., 2005; Pruitt et al., 2009; Tatusov et al., 2000; Yu et al., 2009). The draft genome sequence of P. agglomerans R190 comprised 5 contigs. The genome size was 5,002,566 bp at 309× coverage, with an N50 of 3,393,498 bp. The G + C content was 55.05%. There were 4,778 predicted open reading frames, 23 rRNA genes, and 77 tRNA genes. The total number of ORFs with predicted functions was 3,636. Among the five contigs, three (contigs 3, 4, and 5) were predicted plasmids. Contig 4 contained a gene cluster for a phenazine antibiotic. The gene cluster consisted of 16 total genes and the gene products play roles in phenazine core biosynthesis (ehpA,
http://dx.doi.org/10.1016/j.jbiotec.2014.07.440 0168-1656/© 2014 Published by Elsevier B.V.
Please cite this article in press as: Lim, J.-A., et al., Draft genome sequence of Pantoea agglomerans R190, a producer of antibiotics against phytopathogens and foodborne pathogens. J. Biotechnol. (2014), http://dx.doi.org/10.1016/j.jbiotec.2014.07.440
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2 Table 1 Genome features of P. agglomerans R190. Genome Information
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Contig 1
Genome size (bp) GC ratio (%) Protein coding genes (CDS) tRNA genes rRNA genes
5,002,566 55.05 4,778 77 23
3,393,498 55.49 3,213 60 13
ehpB, ehpC, ehpD, and ehpE), phenazine modification (ehpF, ehpG, ehpH, ehpI, ehpK, ehpL, ehpM, ehpN, and ehpO), transport (ehpJ), and producer resistance (ehpR) (Yu et al., 2011). Genes related to 76 other antibiotics known to be produced by P. agglomerans, such 77 as pantocin or herbicolin, were not predicted, thus it is possible 78 that all antibiotic activity of P. agglomerans strain R190 comes from 79 80Q2 phenazine antibiotics (Table 1). Nucleotide sequence accession number: This Whole Genome 81 Shotgun project has been deposited in GenBank under the acces82 sion number JNGC00000000. The version described in this paper is 83 version JNGC01000000. 84 74 75
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Acknowledgments
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This work was supported by the Rural Development Administration (RDA) fund (PJ008751) and the postdoctoral fellowships of J.L. and D.L.
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References
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Please cite this article in press as: Lim, J.-A., et al., Draft genome sequence of Pantoea agglomerans R190, a producer of antibiotics against phytopathogens and foodborne pathogens. J. Biotechnol. (2014), http://dx.doi.org/10.1016/j.jbiotec.2014.07.440
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