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Prokaryotes

Draft Genome Sequences of Two Janthinobacterium lividum Strains, Isolated from Pristine Groundwater Collected from the Oak Ridge Field Research Center

Xiaoqin Wu, Adam M. Deutschbauer, Alexey E. Kazakov, Kelly M. Wetmore, Bryson A. Cwick, Robert M. Walker, Pavel S. Novichkov, Adam P. Arkin, Romy Chakraborty
Xiaoqin Wu
a Earth and Environmental Sciences, Lawrence Berkeley National Laboratory, Berkeley, California, USA
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Adam M. Deutschbauer
b Environmental Genomics and Systems Biology Division, Lawrence Berkeley National Laboratory, Berkeley, California, USA
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Alexey E. Kazakov
b Environmental Genomics and Systems Biology Division, Lawrence Berkeley National Laboratory, Berkeley, California, USA
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Kelly M. Wetmore
b Environmental Genomics and Systems Biology Division, Lawrence Berkeley National Laboratory, Berkeley, California, USA
c Program in Comparative Biochemistry, University of California, Berkeley, California, USA
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Bryson A. Cwick
a Earth and Environmental Sciences, Lawrence Berkeley National Laboratory, Berkeley, California, USA
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Robert M. Walker
a Earth and Environmental Sciences, Lawrence Berkeley National Laboratory, Berkeley, California, USA
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Pavel S. Novichkov
b Environmental Genomics and Systems Biology Division, Lawrence Berkeley National Laboratory, Berkeley, California, USA
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Adam P. Arkin
b Environmental Genomics and Systems Biology Division, Lawrence Berkeley National Laboratory, Berkeley, California, USA
d Department of Bioengineering, University of California, Berkeley, California, USA
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Romy Chakraborty
a Earth and Environmental Sciences, Lawrence Berkeley National Laboratory, Berkeley, California, USA
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DOI: 10.1128/genomeA.00582-17
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ABSTRACT

We present here the draft genome sequences of two Janthinobacterium lividum strains, GW456P and GW458P, isolated from groundwater samples collected from a background site at the Oak Ridge Field Research Center. Production of a purple pigment by these two strains was observed when grown on diluted (1/10) LB agar plates.

GENOME ANNOUNCEMENT

The genus Janthinobacterium includes rod-shaped, Gram-negative, motile, aerobic bacteria that are known to produce the water-insoluble purple pigment violacein (1, 2). Violacein has been known to have antimicrobial and antiviral properties (1, 3, 4), inhibiting the growth of bacteria (5, 6) and providing bacteria protection against predators (7, 8). To date, only a few environmental isolates of Janthinobacterium spp. have been sequenced (2), and these were isolated from lake sediments (9) and soils (10, 11), mostly in cold habitats (12–16). Until now, no sequenced representatives of Janthinobacterium spp. have been available from the subsurface aquatic environment. In this study, two violet-pigmented J. lividum strains were isolated on diluted (1/10) LB agar plates, from groundwater samples collected from two wells (GW456 and GW458) located at the background area of the Oak Ridge Field Research Center, Oak Ridge, Tennessee, USA.

Genomic DNA was extracted using the PureLink Genomic DNA mini kit (Invitrogen). Genomic sequencing libraries of the two J. lividum strains, GW456P and GW458P, were prepared using the NEBNext DNA library prep kit for Illumina (New England Biolabs). Briefly, 1 µg of genomic DNA was fragmented by ultrasonication to an average size of 800 bp with a Covaris S220 focused ultrasonicator. After end-repair, A-tailing, and ligation of the adapter, we size-selected 800-bp products with AMPure XP beads. The sequencing libraries were quantified on a bioanalyzer with a DNA1000 chip (Agilent). We performed paired-end sequencing (2 × 150 bp) on an Illumina MiSeq using a MiSeq version 2 reagent kit (300 cycles).

The raw reads were assembled using the A5 microbial assembly pipeline version 0.0.4 (17), implemented within the U.S. Department of Energy’s Systems Knowledge Database (Kbase; http://www.kbase.us ) (18). This pipeline automates the processes of read cleaning, error correction, contig assembly, crude scaffolding, misassembly correction, and final scaffolding with stringent parameters repairing previously broken contigs. The draft genome sequence of strain GW456P was 6.27 Mb in length, in 78 contigs, and the total G+C content was 62.89%. For strain GW458P, the genome size was 6.29 Mb, consisting of 156 contigs with a total G+C content of 63.29%.

Automated annotation for each genome was performed using the Joint Genome Institute’s Integrated Microbial Genomics (IMG) version 4.12.0 annotation pipeline (19). Proteins related to violacein biosynthesis were identified in both strains by comparison with the VioA, VioB, VioC, VioD, and VioE proteins from Janthinobacterium sp. HH01 (2) using the GenomeExplorer program (20). We also identified three genes known to regulate violacein biosynthesis (2): the sensor kinase jqsS, the response regulator jqsR, and the autoinducer synthase jqsA. Upstream regions of the vioABCDE operons in both strains contain the inverted repeat TTGATATTTATCAA, which coincides with the published JqsR binding motif (21). Thus, we propose that the expression of violacein biosynthesis operons in strains GW456P and GW458P is dependent on quorum sensing. These genomes are useful for exploring the physiology and regulation of violacein pigment production by these two J. lividum strains.

Accession number(s).Genomes of J. lividum strain GW456P and J. lividum strain GW458P have been deposited at DDBJ/ENA/GenBank under the accession numbers NEHB00000000 and NEGZ00000000 , respectively.

ACKNOWLEDGMENT

This material by ENIGMA-Ecosystems and Networks Integrated with Genes and Molecular Assemblies (http://enigma.lbl.gov ), a Scientific Focus Area Program at Lawrence Berkeley National Laboratory, is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Biological and Environmental Research under contract number DE-AC02-05CH11231.

FOOTNOTES

    • Received 4 May 2017.
    • Accepted 15 May 2017.
    • Published 29 June 2017.
  • Copyright © 2017 Wu et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International license .

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Draft Genome Sequences of Two Janthinobacterium lividum Strains, Isolated from Pristine Groundwater Collected from the Oak Ridge Field Research Center
Xiaoqin Wu, Adam M. Deutschbauer, Alexey E. Kazakov, Kelly M. Wetmore, Bryson A. Cwick, Robert M. Walker, Pavel S. Novichkov, Adam P. Arkin, Romy Chakraborty
Genome Announcements Jun 2017, 5 (26) e00582-17; DOI: 10.1128/genomeA.00582-17

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Draft Genome Sequences of Two Janthinobacterium lividum Strains, Isolated from Pristine Groundwater Collected from the Oak Ridge Field Research Center
Xiaoqin Wu, Adam M. Deutschbauer, Alexey E. Kazakov, Kelly M. Wetmore, Bryson A. Cwick, Robert M. Walker, Pavel S. Novichkov, Adam P. Arkin, Romy Chakraborty
Genome Announcements Jun 2017, 5 (26) e00582-17; DOI: 10.1128/genomeA.00582-17
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