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High quality draft genome sequence and analysis of Pontibacter roseus type strain SRC-1T (DSM 17521T) isolated from muddy waters of a drainage system in Chandigarh, India

Standards in Genomic Sciences volume 10, Article number: 8 (2015) Cite this article

Abstract

Pontibacter roseus is a member of genus Pontibacter family Cytophagaceae, class Cytophagia. While the type species of the genus Pontibacter actiniarum was isolated in 2005 from a marine environment, subsequent species of the same genus have been found in different types of habitats ranging from seawater, sediment, desert soil, rhizosphere, contaminated sites, solar saltern and muddy water. Here we describe the features of Pontibacter roseus strain SRC-1T along with its complete genome sequence and annotation from a culture of DSM 17521T. The 4,581,480 bp long draft genome consists of 12 scaffolds with 4,003 protein-coding and 50 RNA genes and is a part of Genomic Encyclopedia of Type Strains: KMG-I project.

Introduction

The genus Pontibacter was first reported by Nedashkovskaya et al. [1] where they identified and described a menaquinone producing strain isolated from sea anemones. Several new species of the same genus have been reported in the literature since then. In addition to Pontibacter roseus, there are eighteen species with validly published names belonging to Pontibacter genus as of writing this manuscript. Members of genus Pontibacter including P. roseus, is of interest for genomic research due to their ability to synthesize and use menaquinone-7 (MK-7) as the primary respiratory quinone as well as to facilitate functional genomics studies within the group. Strain SRC-1T (= DSM 17521 = CCTCC AB 207222 = CIP 109903 = MTCC 7260) is the type strain of Pontibacter roseus, which was isolated from muddy water from an occasional drainage system of a residential area in Chandigarh, India [2]. P. roseus SRC-1T was initially reported to be Effluviibacter roseus SRC-1T primarily due to its non-motile nature and fatty acid composition [2]. However, subsequent analysis of its fatty acid profile was shown to be more ‘Pontibacter-like’ and gliding motility was observed to be variable in other Pontibacter species [3]. Further, its DNA G + C content, which was originally reported as 59 mol% [2], was also emended to be 52.0–52.3 mol% [3], a value more representative of members of the genus Pontibacter. As such, it was reclassified as Pontibacter roseus SRC-1T [3]. Here we present a summary classification and features for Pontibacter roseus SRC-1T, along with the genome sequence and annotation of DSM 17521T.

Organism information

Classification and features

P. roseus SRC-1T cells are non-motile, stain Gram-negative, do not form spores and are rod-shaped approximately 1.0–3.0 μm in length and 0.3–0.5 μm in width [2]. It is an obligate aerobe which can grow at a wide temperature range of 4–37°C with the optimum being 30°C (Table 1 and [2]). P. roseus SRC-1T is a halotolerant microbe, can tolerate up to 8% NaCl and can utilize a wide range of sugars such as D-fructose, D-galactose, D-glucose, lactose, raffinose and sucrose as the sole source of carbon (Table 1 and [2]).

Table 1 Classification and general features of Pontibacter roseus SRC-1T according to the MIGS recommendations [4], published by the Genomic Standards Consortium [5]
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A representative genomic 16S rRNA sequence of Pontibacter roseus SRC-1T was compared with the May 2013; release 13_5 of Greengenes database [14] using NCBI BLAST under default values. The top 250 hits with an alignment length cut-off of 1000 bp were retained among which genomes belonging to genus Pontibacter were the most abundant (45.6%) followed by Adhaeribacter (35.6%), those assigned to the family Cytophagaceae but without a defined genus name (16.4%) and Hymenobacter (2.4%). Among samples with available metadata, approximately 61% of the above hits were from a soil environment, 11% were isolated from skin and approximately 9% from aquatic samples. This distribution reflects the wide range of habitats commonly observed among members of the genus Pontibacter and its phylogenetic neighbors, ranging from forest soil to desert, contaminated aquatic and soil environments, sediments and seawater among others [15–18]. Figure 1 shows the phylogenetic neighborhood of Pontibacter roseus SRC-1T in a 16S rRNA based tree.

Figure 1
figure 1

Neighbour-joining phylogenetic tree based on 16S rRNA gene sequences, showing the relationships of Pontibacter roseus SRC-1T to other published Pontibacter type strains and representative type strains of the family Cytophagace ae with Salinibacter ruber M31 as the outgroup. The neighbor joining [19] tree was constructed using MEGA v5.2.2 [20] based on the p-distance model with bootstrap values >50 (expressed as percentages of 1,000 replicates) shown at branch points. Lineages with type strain genome sequencing projects registered in GOLD [21] are labeled with one asterisk, while those with a published genome sequence is marked with two asterisks [16, 22, 23].

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The predominant respiratory quinone for strain SRC-1T is menaquinone 7 (MK-7), consistent with other members of the Pontibacter genus. Short chain menaquinones with six or seven isoprene units are characteristic of the different genera within the aerobic members of the phylum Bacteroidetes. The primary whole-cell fatty acids are branched chain iso-C15 : 0 (14%), iso-C17 : 0 3-OH (14.7%) and summed feature 4 (34.9%, comprising of anteiso-C17 : 1 B and/or iso-C17 : 1 I, a pair of fatty acids that are grouped together for the purpose of evaluation by the Microbial Identification System(MIDI) as described earlier [24]) [2, 3]. 2-OH Fatty acids are absent. The original paper describing P. roseus SRC-1T (as Effluviibacter roseus) [2] lists the polar lipids in strain SRC-1T being phosphatidylglycerol, diphosphatidylglycerol and an unknown phospholipid. This is in stark contrast to the known lipid profile of this evolutionary group where phosphatidylethanolamine is usually the sole major digylceride based phospholipid and other non-phosphate based lipids make up a significant proportion of the polar lipids. Accordingly, while genes for phosphatidylserine synthase and a decarboxylase to convert the serine to phosphatidylethanolamine could be detected, we did not find any evidence in P. roseus DSM 17521T genome to indicate that it produces the corresponding enzymes involved in the synthesis of phosphatidylglycerol or diphosphatidylglycerol. We therefore conclude that the original report on the lipid composition of strain SRC-1T is probably in error. It should be noted that the original publication did not provide images of the TLC plates allowing others to examine these data set [2].

Genome sequencing and annotation

Genome project history

This organism was selected for sequencing on the basis of its phylogenetic position [25, 26]. It is a part of the Genomic Encyclopedia of Type Strains, KMG-I project [27], a follow-up of the GEBA project [28], which aims to increase the sequencing coverage of key reference microbial genomes and to generate a large genomic basis for the discovery of genes encoding novel enzymes [29]. KMG-I is a Genomic Standards Consortium project [30]. The genome project is deposited in the Genomes OnLine Database [21], the annotated genome is publicly available from the IMG Database [31] under the accession 2515154084, and the permanent draft genome sequence has been deposited at GenBank under accession number ARDO00000000. Sequencing, finishing and annotation were performed by the DOE Joint Genome Institute (JGI) using state of the art technology [32]. The project information is briefly summarized in Table 2.

Table 2 Project information
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Growth conditions and DNA isolation

Pontibacter roseus DSM 17521T, was grown aerobically in DSMZ medium 948 (Oxoid nutrient broth) [33] at 30°C. Genomic DNA was isolated using a Jetflex Genomic DNA Purification Kit (GENOMED 600100) following the standard protocol provided by the manufacturer with the following modifications: an additional incubation (60 min, 37°C) with 50 μl proteinase K and finally adding 200 μl protein precipitation buffer (PPT). DNA is available through the DNA Bank Network [34].

Genome sequencing and assembly

The draft genome of Pontibacter roseus DSM 17521T was generated at the DOE-JGI using the Illumina technology [35]. An Illumina Std shotgun library was constructed and sequenced using the Illumina HiSeq 2000 platform which generated 12,071,874 reads totaling 1,810.8 Mbp. All general aspects of library construction and sequencing performed at the JGI is publicly available [36]. All raw Illumina sequence data was passed through DUK, a filtering program developed at JGI, which removes known Illumina sequencing and library preparation artifacts. Following steps were then performed for assembly: (1) filtered Illumina reads were assembled using Velvet (version 1.1.04) [37], (2) 1–3 Kbp simulated paired end reads were created from Velvet contigs using wgsim [38], (3) Illumina reads were assembled with simulated read pairs using Allpaths–LG (version r41043) [39]. Parameters for assembly steps were: 1) Velvet (velveth: 63 –shortPaired and velvetg: -very clean yes –export- Filtered yes –min_contig_lgth 500 –scaffolding no –cov_cutoff 10) 2) wgsim (-e 0 –1 100 –2 100 –r 0 –R 0 –X 0) 3) Allpaths–LG (PrepareAllpathsInputs: PHRED_64 = 1 PLOIDY = 1 FRAG_COVERAGE = 125 JUMP_COVERAGE = 25 LONG_JUMP_COV = 50, RunAllpathsLG: THREADS = 8 RUN = std_shredpairs TARGETS = standard VAPI_WARN_ONLY = True.

OVERWRITE = True). The final draft assembly contained 12 scaffolds. The total size of the genome is 4.6 Mbp and the final assembly is based on 562.0 Mbp of Illumina data, which provides an average 122.8 × coverage of the genome. Additional information about the organism and its genome sequence and their associated MIGS record is provided in Additional file 1.

Genome annotation

Genes were identified using Prodigal [40] as part of the JGI genome annotation pipeline [41], followed by a round of manual curation using the JGI GenePRIMP pipeline [42]. The predicted CDSs were translated and used to search the NCBI nonredundant database, UniProt, TIGRFam, Pfam, PRIAM, KEGG, COG, and InterPro databases. These data sources were combined to assert a product description for each predicted protein. Non-coding genes and miscellaneous features were predicted using tRNAscan-SE [43], RNAMMer [44], Rfam [45], TMHMM [46], SignalP [47] and CRT [48]. Additional gene functional annotation and comparative analysis were performed within the IMG platform [49].

Genome properties

The assembly of the draft genome sequence consists of 12 scaffolds amounting to a 4,581,480 bp long chromosome with a GC content of approximately 53% (Table 3 and Figure 2). Of the 4,053 genes predicted, 4,003 were protein-coding genes along with 50 RNAs. The majority of protein-coding genes (69.4%) were assigned with a putative function while the remaining ones were annotated as hypothetical proteins.

Table 3 Genome statistics
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Figure 2
figure 2

The graphical map of the largest scaffold of the genome. From bottom to the top: Genes on forward strand (color by COG categories), Genes on reverse strand (color by COG categories), RNA genes (tRNA green, rRNA red, other RNAs black), GC content, GC skew (purple/olive).

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The functional distribution of genes assigned to COGs is shown in Table 4. A large percentage of the genes do not have an assigned COG category, are unknown or fall into general function prediction, which is typical for a newly sequenced organism that has not been well characterized yet.

Table 4 Number of genes associated with the 25 general COG functional categories
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Insights from the genome sequence

Menaquinone biosynthesis

Respiratory lipoquinones such as ubiquinone and menaquinone are essential components of the electron transfer pathway in bacteria and archaea. While ubiquinones are limited to members of Alphaproteobacteria, Gammaproteobacteria and Betaproteobacteria [50], menaquinones have been found to be more widespread among prokaryotes [51, 52], occurring in both aerobes and anaerobes. Menaquinone is a non-protein lipid-soluble redox component of the electron transport chain, which plays an important role in mediating electron transfer between membrane-bound protein complexes. The classical menaquinone biosynthesis pathway was studied primarily in Escherichia coli; more recently, an alternate pathway was identified in Streptomyces coelicolor A3(2) as well as in pathogens such as Helicobacter pylori and Campylobacter jejuni [53, 54], aspects of which remain to be fully elucidated.

All identified species of the genus Pontibacter are known to possess menaquinone – 7 [16] which is the primary respiratory quinone in Pontibacter roseus SRC-1T [2]. Biosynthesis of menaquinone in this organism appears to occur via the classical pathway. Using comparative genomics we identified the genes possibly involved in menaquinone biosynthesis in P. roseus DSM 17521T (Table 5). Menaquinone biosynthesis genes have been extensively studied in E. coli where they are organized in an operon and in B. subtilis where gene neighborhood was helpful in identifying menC and menH genes [61]. However, the P. roseus genes seem to be spread across its chromosome. It is well known that conservation of gene order in bacteria can be disrupted during the course of evolution [62]. For example, isolated genes belonging to the menaquinone biosynthesis pathway leading to phylloquinione biosynthesis were identified in Synechocystis sp. PCC 6803 through sequence similarity with E. coli followed by transposon mutagenesis [63, 64]. As more genomes become available, these aspects can be investigated in greater detail.

Table 5 Predicted menaquinone biosynthesis genes in Pontibacter roseus DSM 17521 T
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An o-succinylbenzoate synthase that is part of the menaquinone biosynthetic pathway encoded by the menC gene in E. coli and B. subtilis is missing from the Pontibacter roseus genome. A gene annotated as muconate cycloisomerase in Pontibacter roseus DSM 17521T (IMG geneID 2515480441) may perform this function. It contains conserved domains belonging to Muconate Lactonizing Enzyme subgroup of the enolase superfamily. Sequence similarity between different members of the enolase superfamily is typically less than 25% [65]. Even though they possess similar structural scaffolds, they are known to have evolved significantly such that their functional role cannot be easily assigned through sequence similarity alone [66]. For example, B. subtilis menC was initially annotated as ‘similar to muconate cycloisomerase of Pseudomonas putida’ and ‘N-acylamino acid racemase’ but was later corrected to be OSBS [61]. The P. roseus gene shares protein level identity of 48% with muconate cycloisomerase 1 of Pseudomonas putida [60] and approximately 23% and 17% with E. coli and B. subtilis MenC respectively [61, 67]. Multiple sequence alignment (Figure 3) of the above three genes reveal conservation of Asp161, Glu190, Asp213 and Lys235 (boxes in Figure 3) which have been predicted to be essential for OSBS in E. coli and other members of the enzyme family [65]. We thereby propose that IMG 2515480441 performs the function of MenC in P. roseus DSM 17521T.

Figure 3
figure 3

Multiple sequence alignment of MenC from E. coli , B. subtilis and predicted MenC in P. roseus (IMG 2515480441) showing conserved amino acids predicted to be essential for proper functioning of the enzyme.

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Multidrug resistance (MDR) efflux pump

Resistance to antibiotic drugs is one of the major public health concerns of today as highlighted in the recent report by the CDC [68]. Among several other mechanisms, multidrug resistance efflux pumps play a very important role in conferring decreased susceptibility to antibiotics in bacteria by transporting drugs across the bacterial membrane and preventing intracellular accumulation [69]. AcrAB-TolC is one of the most studied MDR efflux systems in Gram-negative bacteria. It is comprised of an inner membrane efflux transporter (AcrB), a linker protein (AcrA) and an outer membrane protein (TolC), which interacts with AcrA and AcrB and forms a multifunctional channel that is essential to pump cellular products out of the cell [69, 70]. Previous reports have identified gene clusters predicted to confer antibiotic resistance in members of Pontibacter [16]. Applying comparative analysis with characterized proteins, we identified a set of genes (IMG ID 2515478940–43) that may function as a multi-drug resistance efflux pump in P. roseus DSM 17521T (Figure 4).

Figure 4
figure 4

Predicted MDR efflux system in P. roseus with AcrAB-TolC along with a transcriptional regulator.

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P. roseus 2515478940 is 37% identical to E. coli multidrug efflux pump subunit AcrB [71]; 2515478941 shares 28% identity to E. coli AcrA [72] while 2515478942 is 20% identical to E. coli outer membrane protein TolC [73]. Additionally, there is a transcriptional repressor (2515478943) upstream of TolC which shares 25% protein level identity to HTH-type transcriptional repressor Bm3R1 [74] from Bacillus megaterium and may act as a regulator of the MDR transport system in P. roseus DSM 17521T.

Conclusions

Members of the genus Pontibacter occupy a unique phylogenetic niche within the phylum Bacteroidetes. As of writing, this genome report is only the second for the entire genus. In addition to a detailed analysis of the P. roseus genome we highlight some of the key functional characteristics of the organism and summarize the genes encoding enzymes leading to the biosynthesis of menaquinone, the primary respiratory quinone for majority of the species of the genus.

Abbreviations

KMG:

One thousand microbial genomes

OSBS:

o-succinylbenzoate synthase

MDR:

Multi-Drug Resistance.

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Acknowledgements

The authors gratefully acknowledge the assistance of Andrea Schütze for growing P. roseus DSM 17521T cultures and Evelyne-Marie Brambilla for DNA extraction and quality control (both at the DSMZ). The work conducted by the U.S. Department of Energy Joint Genome Institute, a DOE Office of Science User Facility, is supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. A. L. was supported in part by Russian Ministry of Science Mega-grant no.11.G34.31.0068 (PI. Dr. Stephen J O’Brien).

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Authors and Affiliations

  1. DOE Joint Genome Institute, Walnut Creek, California, USA

    Supratim Mukherjee, Nicole Shapiro, Jan-Fang Cheng, James Han, TBK Reddy, Marcel Huntemann, Natalia Ivanova, Natalia Mikhailova, Tanja Woyke, Nikos C Kyrpides & Amrita Pati

  2. T. Dobzhansky Center for Genome Bionformatics, St. Petersburg State University, St. Petersburg, Russia

    Alla Lapidus

  3. Algorithmic Biology Lab, St. Petersburg Academic University, St. Petersburg, Russia

    Alla Lapidus

  4. Leibniz Institute DSMZ – German Collection of Microorganisms and Cell Cultures, Braunschweig, Germany

    Stefan Spring, Markus Göker, Brian J Tindall & Hans-Peter Klenk

  5. Biological Data Management and Technology Center, Lawrence Berkeley National Laboratory, Berkeley, California, USA

    Amy Chen, Krishna Palaniappan & Victor Markowitz

  6. King Abdulaziz University, Jeddah, Saudi Arabia

    Nikos C Kyrpides

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The authors declare that they have no competing interests.

Authors’ contributions

SM, BJT, SS, MG, HPK, NCK and AP drafted the manuscript. AL, NS, J-FC, JH, TBKR, MH, NI, NM, AC, KP and TW sequenced, assembled and annotated the genome. All authors read and approved the final manuscript.

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Mukherjee, S., Lapidus, A., Shapiro, N. et al. High quality draft genome sequence and analysis of Pontibacter roseus type strain SRC-1T (DSM 17521T) isolated from muddy waters of a drainage system in Chandigarh, India. Stand in Genomic Sci 10, 8 (2015). https://doi.org/10.1186/1944-3277-10-8

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Keywords

Environmental Microbiome

ISSN: 2524-6372