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Draft genome sequence of Mycobacterium rufum JS14T, a polycyclic-aromatic-hydrocarbon-degrading bacterium from petroleum-contaminated soil in Hawaii

Standards in Genomic Sciences volume 11, Article number: 47 (2016) Cite this article

Abstract

Mycobacterium rufum JS14T (=ATCC BAA-1377T, CIP 109273T, JCM 16372T, DSM 45406T), a type strain of the species Mycobacterium rufum sp. . belonging to the family Mycobacteriaceae, was isolated from polycyclic aromatic hydrocarbon (PAH)-contaminated soil in Hilo (HI, USA) because it harbors the capability of degrading PAH. Here, we describe the first genome sequence of strain JS14T, with brief phenotypic characteristics. The genome is composed of 6,176,413 bp with 69.25 % G + C content and contains 5810 protein-coding genes with 54 RNA genes. The genome information on M. rufum JS14T will provide a better understanding of the complexity of bacterial catabolic pathways for degradation of specific chemicals.

Introduction

Polycyclic aromatic hydrocarbons, defined as organic molecules consisting of two or more fused aromatic rings in linear, angular, or cluster arrangement, mostly result from coke production, petroleum refining, fossil fuel combustion, and waste incineration [1]. Although the physical and chemical properties of PAHs vary depending on the number of rings, the characteristics such as hydrophobicity, recalcitrance, and mutagenic and carcinogenic potentials have been considered the main factors for the toxic effects on environmental ecosystems and human beings [1, 2].

For removal of PAHs from contaminated environments, the bioremediation process based on microbial activities has attracted interest and has been actively studied [3]. Various bacteria, such as Sphingomonas spp., Pseudomonas spp., Rhodococcus spp., Burkholderia spp., and Mycobacterium spp., have been investigated regarding whether they can metabolize PAHs. In particular, several Mycobacterium species have been reported to effectively degrade high-molecular-weight PAHs [4, 5]. Moreover, genomic studies on these bacterial species have contributed to the understanding of whole regulatory mechanisms of bacterial PAH degradation, for example for M. vanbaalenii PYR-1 [6], M. gilvum Spyr1 [7], and M. gilvum PYR-GCK [8] as well as the most recently reported M. aromaticivorans JS19b1T [9].

M. rufum JS14T (=ATCC BAA-1377 T, CIP 109273T , JCM 16372 T, DSM 45406 T) is the type strain of the species Mycobacterium rufum sp. nov. [10]. This bacterium was isolated from petroleum-contaminated soil at a former oil gasification company site in Hilo (HI, USA). The bacterium was identified because of PAH degradation activities, especially toward a four-ring-fused compound, fluoranthene [11]. Although the PAH-degrading ability has been demonstrated through metabolic and proteomic assays [12], genetic studies on the whole bacterial system with a PAH degradation pathway have not been conducted. Here, we present a brief summary of the characteristics of this strain and a genetic description of its genome sequence.

Organism information

Classification and features

The 16S ribosomal RNA gene sequence of M. rufum JS14T was compared with those from other Mycobacterium species using the BLAST software of NCBI [13]. The highest similarity was found with M. chlorophenolicum PCP-1 (99 % identity) [14, 15] followed by M. gilvum Spyr1 (99 % identity) [7], M. gilvum PYR-GCK (99 % identity) [8], M. vanbaalenii PYR-1 (98 % identity) [16], and M. fluoranthenivorans FA4T (97 % identity) [17]. Species identified by the BLAST search and represented by full-length 16S rRNA gene sequences were included in the phylogenetic analysis. The phylogenetic tree was generated by the neighbor-joining method [18], and bootstrapping was set to 1000 times for random replicate selections. The consensus phylogenetic neighborhood of M. rufum JS14T within the genus Mycobacterium is shown in Fig. 1.

Fig. 1
figure 1

A neighbor-joining phylogenetic tree depicting the position of M. rufum JS14T [10] (shown in boldface with an asterisk) relative to the other species within the genus Mycobacterium. In this genus, species carrying the full length of 16S rRNA gene sequence were selected from the NCBI database [45]. The collected nucleotide sequences were aligned using ClustalW [46], and the phylogenetic tree was constructed using software MEGA version 6 [47] by the neighbor-joining method with 1000 bootstrap replicates [18]. The generated bootstrap values for each species are presented at the nodes, and the scale bar indicates 0.005 nucleotide changes per nucleotide position. The strains under study and their corresponding GenBank accession numbers for 16S rRNA genes are as follows: M. chlorophenolicum PCP-I [14, 15] (NR_119093); M. gilvum Spyr1 [37, 48] (NR_074644); M. gilvum PYR-GCK [37, 48] (NR_074553); M. rhodesiae NBB3 [49] (NR_102870); M. vanbaalenii PYR-1 [16] (NR_074572); M. fluoranthenivorans FA4 [17, 50] (NR_042224); M. wolinskyi 700010 [51] (NR_119253); M. mageritense 938 [52] (NR_042265); M. smegmatis str. MC2 155 [37, 53] (NR_074726); M. flavescens ATCC 14474 [37, 54] (NR_044815); M. novocastrense 73 [55] (NR_029208); M. insubricum FI-06250 [56] (NR_125525); M. florentinum FI-93171 [57] (NR_042223); M. montefiorense ATCC BAA-256 [58, 59] (NR_028808); M. confluentis 1389/90 [60] (NR_042245); M. holsaticum 1406 [61] (NR_028945); M. elephantis DSM 44368 [62] (NR_025296); M. marinum M [37, 63] (NR_074864); M. ulcerans Agy99 [37, 64] (NR_074861); M. bovis BCG str. Pasteur 1173P2 [37, 65] (NR_074838); M. canettii CIPT 140010059 [66] (NR_074836); M. africanum GM041182 [37, 67] (NR_074835)

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M. rufum JS14T is a non-motile, aerobic, Gram-positive bacterium belonging to the family Mycobacteriaceae [10]. The cell shape is medium-to-long thin rods, and cell size is approximately 1.0–2.0 μm in length with the width of 0.4–0.6 μm as shown in Fig. 2. Generally, large, round, raised, smooth orange-pigmented colonies form within 7 days [10]. As one of the rapidly growing members of the genus Mycobacterium , the strain grows optimally at 28 °C, reduces nitrate, but does not tolerate salinity (over 2.5 % NaCl, w/v) [10]. Strain JS14T shows positive reactions in tests for catalase, α-glucosidase, aesculin hydrolysis, and urease, but negative reactions regarding β-glucuronidase, β-galactosidase, N-acetyl-β-glucosaminidase, gelatin hydrolysis, alkaline phosphatase, and pyrrolidonyl arylamidase activities [10]. Substrate oxidation was noticed for Tween 40, Tween 80, D-gluconic acid, D-glucose, D-fructose, D-xylose, D-mannose, D-psicose, trehalose, dextrin, glycogen, and D-mannitol, but not for α-/β-cyclodextrin, D-galactose, α-D-lactose, maltose, sucrose, mannan, or maltotriose [10]. When cultured in the minimal medium (per liter: 8.8 g of Na2HPO4°2H2O, 3.0 g of KH2PO4, 1.0 g of NH4Cl, 0.5 g of NaCl, 1.0 mL of 1 M MgSO4, and 2.5 mL of a trace element solution [per liter: 23 mg of MnCl2°2H2O, 30 mg of MnCl4∙H2O, 31 mg of H3BO3, 36 mg of CoCl2°6H2O, 10 mg of CuCl2°2H2O, 20 mg of NiCl2°6H2O, 30 mg of Na2MoO4°2H2O, and 50 mg of ZnCl2]) [11] supplemented with the four-aromatic ring-fused PAH compound fluoranthene (final concentration of 40 mg/L), M. rufum JS14T showed an effective degrading action on the added compound by utilizing it completely during 10 days as a sole source of carbon and energy [11].

Fig. 2
figure 2

A scanning electron micrograph of M. rufum JS14T. The image was taken using a Field Emission Scanning Electron Microscope (SU8220; Hitachi, Japan) at an operating voltage of 10.0 kV. The scale bar represents 5.0 μm

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Chemotaxonomic data

The main cellular fatty acids of M. rufum JS14T are C18:1ω9c (36.72 %), C16:0 (26.24 %), C16:1ω7c + C16:1ω6c (9.40 %), C17:1ω7c (8.44 %), C14:0 (5.27 %), C18:0 (3.14 %), and C17:0 (1.94 %), respectively [10]. The profile of whole-cell fatty acids showed a pattern similar to that of the other representative of Mycobacterium species [10, 19–21]. The strain showed bright red color under a microscope after acid-fast staining. A gas chromatogram of fatty acid methyl esters from the transmethylated cells of M. rufum JS14T revealed a major C24:0 peak and a trace of a C22:0 peak. The general characteristics of the strain are summarized in Table 1.

Table 1 Classification and general features of M. rufum JS14T [22]
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Genome sequencing information

Genome project history

Strain M. rufum JS14T was selected for sequencing because of its effective ability to degrade PAH, as a model organism for a recalcitrant organic-pollutant-degrading bacterium. The genome sequencing was performed in September, 2014, and the Whole Genome Shotgun project was deposited in the DDBJ/EMBL/GenBank databases under the accession number JROA00000000. The version described in this study is the first version, labeled JROA00000000.1. The sequencing project information and its association with the Minimum Information about a Genome Sequence version 2.0 compliance [22] are described in Table 2.

Table 2 Project information
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Growth conditions and genomic DNA preparation

M. rufum JS14T from Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH (strain accession number DSM 45406 T) was used for preparation of genomic DNA. The strain was cultured aerobically in a 250-mL Erlenmeyer flask containing 50 mL of tryptic soy broth (Difco Laboratories Inc., Detroit, MI), on a rotary shaker at 200 rpm and 30 °C. Genomic DNA was isolated from 50 mL of culture using the QIAamp® DNA Mini Kit (Qiagen, Valencia, CA) following the standard protocol recommended by the manufacturer. The quantity and purity of the extracted genomic DNA were assessed with a Picodrop Microliter UV/Vis Spectrophotometer (Thermo Fisher Scientific Inc., Waltham, MA) and Qubit® 2.0 Fluorometer (Fisher Scientific Inc.), respectively. Finally, a DNA concentration of 780.0 ng/μL and OD 260/OD 280 of 1.87 was determined.

Genome sequencing and assembly

The genome of M. rufum JS14T was sequenced using the single-molecule real-time DNA sequencing platform on the Pacific Biosciences RS II sequencer with P5 polymerase - C3 sequencing chemistry (Pacific Biosciences, Menlo Park, CA) [23]. A 20-kb insert SMRT-bell library was prepared from the sheared genomic DNA and loaded onto two SMRT cells. During the single 180-min run-time, 1,020,750,498 read bases were generated with 300,584 reads. Reads of less than 100 bp or with low accuracy (below 0.8) were removed. In total, 111,515 reads produced 823,795,879 bases with a read quality of 0.831.

All post-filtered reads were assembled de novo using the RS hierarchical genome assembly process, version 3.3 in SMRT analysis software, version 2.2.0 (Pacific Biosciences) [24] and resulted in 4 contigs corresponding to 4 scaffolds, with 113.03-fold coverage. The maximal contig length and N50 contig length had the same size of 5,760,162 bp. The whole genome was found to be 6,176,413 bp long.

Genome annotation

The protein-coding sequences were predicted by Prokaryotic Genome Annotation Pipeline, version 2.8, on the NCBI website (rev. 447580) [25]. Additional gene prediction and functional annotation were performed in the Rapid Annotation using Subsystems Technology server [26] and Integrated Microbial Genomes-Expert Review pipeline [27], respectively.

Genome properties

The genome size of M. rufum JS14T was found to be 6,176,413 bp with the average G + C content of 69.25 %. The genome was predicted to contain a total of 5864 genes, which include 5810 protein-coding genes with 54 RNA genes (6 rRNAs, 47 tRNAs, and 1 ncRNA). Of these, 4498 genes were assigned to putative functions, and 3669 genes (approximately 62.57 %) were assigned to the COG functional categories. The genome statistics are presented in Table 3 and Fig. 3, respectively. The gene distribution within the COG functional categories is presented in Table 4.

Table 3 Genome statistics
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Fig. 3
figure 3

A graphical circular map of the M. rufum JS14T genome. The circular map was generated using the BLAST Ring Image Generator software [68]. From the inner circle to the outer circle: Genetic regions; GC content (black), and GC skew (purple/green), respectively

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

Regarding the specific degradation capability toward the four-aromatic-ring-fused compound, fluoranthene [10–12], the genome of M. rufum JS14T was found to contain corresponding genes encoding proteins for the aromatic-compound degradation.

Generally, it is known that an initial step of the bacterial degradation of PAHs is mainly catalyzed by multicomponent dioxygenases that produce dihydrodiols [28, 29]. In the genome, multiple genes encoding various dioxygenases such as aromatic-ring-hydroxylating dioxygenase (EU78_28655, 28730, 29130), extradiol dioxygenase (EU78_24090, 26390), protocatechuate 3,4-dioxygenase alpha subunit (EU78_29035), protocatechuate 3,4-dioxygenase beta subunit (EU78_29030), phthalate 3,4-dioxygenase ferredoxin reductase subunit (EU78_29090), and extradiol ring-cleavage dioxygenase (EU78_16970, 28720) were predicted. In addition, the genes coding for such enzymes as cytochrome P450 (EU78_02320, 09230, 14085, 14465, 20055, 26160), methyltransferase (EU78_01005), flavin-dependent oxidoreductase (EU78_19900), and 3,4-dihydroxyphthalate decarboxylase (EU78_28715) were also identified as functional genes on the Kyoto Encyclopedia of Genes and Genomes map [30] for the PAH degradation. Nonetheless, when compared with the complete genome sequences of PAH-degrading organisms [6–9], several genes coding for representative functional enzymes with relevance to PAH degradation such as nidA (PAH dioxygenase large subunit), nidB (PAH dioxygenase small subunit), phtAa (phthalate 3,4-dioxygenase alpha subunit), phtAb (phthalate 3,4-dioxygenase beta subunit), phtB (phthalate 3,4-cis-dihydrodiol dehydrogenase), phdE (cis-3,4-dihydrophenanthrene-3,4,-diol dehydrogenase), and phdK (2-formylbenzoate dehydrogenase) were not identified (shown in Table 5).

Table 5 Comparison of the functional gene counts in the function profile of genome sequences
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Generally, research on bacteria degrading PAHs holds great promise for biotechnological applications to decontamination of pollutants [10]. In this regard, understanding of PAH degradation by indigenous microbes is important for evaluation of ecological effects of these microbes [31]. On Hawaiian islands, PAH contamination has occurred through various activities such as the petroleum industry, waste incineration, and fossil fuel combustion, even via natural causes such as volcanic activity [10]. Mycobacterium is a well-known genus capable of mineralizing PAHs [12]. Considering the Hawaiian delicate island ecosystem, several native bacteria belonging to the genus Mycobacterium were isolated, M. rufum JS14T is one of them [10].

One of native isolates from the petroleum-contaminated Hawaiian soil in Hilo (HI, USA), M. aromaticivorans JS19b1T [10], is known to have rapid degrading capabilities toward various PAHs such as fluorene, phenanthrene, pyrene, and fluoranthene [10, 11, 29]. Similarly, M. rufum JS14T was found as an effective degrader of a four-aromatic-ring-fused compound, fluoranthene, not showing degrading capacity toward other high-molecular-weight PAHs (e.g., pyrene, benzo[a]pyrene) or toward low-molecular-weight PAHs (e.g., fluorene, phenanthrene) [11, 12]. The gene annotation profiles for the genome of M. rufum JS14T may provide important clues to the identity of the whole metabolic pathway for fluoranthene degradation. Just as a recent study on the functional pan-genome analysis of the genus Mycobacterium capable of degrading PAHs [32], our data can also help to explain the complexity of bacterial catabolic pathways for degradation of specific chemicals, from the standpoint of microbial ecology.

Conclusions

M. rufum JS14T was isolated from PAH-contaminated soil of a former oil gasification company site in Hilo (HI, USA) and was designated as a novel species that was named Mycobacterium rufum (ru’fum. L. neut. adj. rufum ruddy or red, pertaining to the colony pigmentation of the type strain) [10]. In this study, we presented the genome sequence of the strain. This genetic information may provide new insights that will help to extend the application potential of bacterial bioremediation of various toxic compounds and to elucidate the features of metabolic degradation pathways for PAHs.

Abbreviations

PAHs:

polycyclic aromatic hydrocarbons

SMRT:

single-molecule real-time

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Acknowledgements

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (NRF-2015R1C1A2A01055308).

Authors’ contributions

QXL isolated and characterized the M. rufum JS14T and drafted the manuscript. YK and JHS performed all the experiments on the genome sequencing and drafted the manuscript. All authors read and approved the final manuscript.

Competing interests

The authors declare that they have no competing interests.

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Authors and Affiliations

  1. School of Applied Biosciences, College of Agriculture and Life Sciences, Kyungpook National University, Daegu, 702-701, Republic of Korea

    Yunyoung Kwak & Jae-Ho Shin

  2. Department of Molecular Biosciences and Bioengineering, University of Hawaii, Honolulu, HI, 96822, USA

    Qing X. Li

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  1. Yunyoung Kwak
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Correspondence to Jae-Ho Shin.

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Kwak, Y., Li, Q.X. & Shin, JH. Draft genome sequence of Mycobacterium rufum JS14T, a polycyclic-aromatic-hydrocarbon-degrading bacterium from petroleum-contaminated soil in Hawaii. Stand in Genomic Sci 11, 47 (2016). https://doi.org/10.1186/s40793-016-0167-5

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Keywords

Environmental Microbiome

ISSN: 2524-6372