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High quality genome sequence and description of Enterobacter mori strain 5–4, isolated from a mixture of formation water and crude-oil


Enterobacter mori strain 5–4 is a Gram-negative, motile, rod shaped, and facultatively anaerobic bacterium, which was isolated from a mixture of formation water (also known as oil-reservior water) and crude-oil in Karamay oilfield, China. To date, there is only one E. mori genome has been sequenced and very little knowledge about the mechanism of E. mori adapted to the petroleum reservoir. Here, we report the second E. mori genome sequence and annotation, together with the description of features for this organism. The 4,621,281 bp assembly genome exhibits a G + C content of 56.24% and contains 4,317 protein-coding and 65 RNA genes, including 5 rRNA genes.


The genus Enterobacter was created by Hormaeche and Edwards in 1960 [1]. Members of the genus were isolated mostly from the environment, in particular from plants and recognized as notorious plant pathogens, but were also frequently isolated from hospitals, notably in healthcare associated infections and recognized as opportunistic pathogens [2, 3]. Twenty-nine validly published species and 2 subspecies have previously been recorded in the genus Enterobacter. However, 17 of the validly named species have been subsequently reclassified as members of 11 other genera. As of Oct 2014, this genus contains only 10 species and two subspecies [4]. As of Oct, 2014, a total of 116 Enterobacter strains have been sequenced and 29 genome sequences were published [512], however, only one genome of E. mori isolated from diseased mulberry roots has been sequenced [13]. E. mori strain 5–4 is a Gram-negative, motile, rod shaped, and facultatively anaerobic bacterium, isolated from a crude-oil well. It is worthy of note that E. mori strain 5–4 is capable of degrading petroleum (Additional file 1). In order to elucidate comprehensive alkane degradation pathways and adaption mechanism in E. mori strain 5–4, whole-genome sequence analysis was thus conducted. Here, we present a summary classification and a set of features for E. mori strain 5–4, together with the description of the genomic sequencing and annotation.

Classification and features

A formation water sample was collected from Karamay Oilfield, Xinjiang, China, in 2012. The water sample was preserved at -80°C immediately after collection and sent to the lab. E. mori strain 5–4 was isolated after cultivation on LB agar medium at 37°C. The optimum temperature for growth is 35°C, with a temperature range of 4-45°C (Table 1). Growth occurs under aerobic condition. Grows at pH 5.5-10.0, and optimally at pH 7.0. Cell morphology was examined by using scanning electron microscopy (Quanta 200, FEI Co., USA). Colonies are light yellow, smooth, circular with entire margins, with a diameter ranging 0.3-0.8 μm, and from 0.6 to 1.8 μm long (Figure 1). Themethyl red test is negative. H2S and indole are not produced. Casein and starch are not hydrolysed; gelatin is hydrolysed. Sorbitol, glycerol, tetradecane and hexadecane are utilized as the carbon source, while lactose, rhamnose, glucose, maltose, cellobiose, galactose, raffinose and sucrose are not utilized. Nitrite sodium and ammonium chloride are utilized, while nitrate sodium is not reduced. Antimicrobial susceptibility test showed that this strain is susceptible to ampicillin, tetracycline, erythromycin and gentamicin, and resistant to kanamycin.

Table 1 Classification and general features of Enterobacter mori strain 5–4 according to the MIGS recommendations [14]
Figure 1

Scanning electron micrograph of cells of Enterobacter mori strain 5–4 bar: 2.0 μm.

Figure 2

Phylogenetic tree highlighting the position of E. mori 54 relative to other type strains within the genus Enterobacter. The strains and their corresponding GenBank accession numbers for 16S rRNA genes are shown following the organism names. Bootstrap consensus trees were inferred from 100 replicates, only bootstrap values > 50% were indicated. Xenorhabdus poinarii DSM 4768T was used as anoutgroup. The scale bar, 0.0005 substitutions per nucleotide position.

A comparative taxonomic analysis was conducted based on the 16S rRNA nucleotide sequence. The representative 16S rRNA nucleotide sequence of Enterobacter mori strain 5–4 was compared against the most recent release of the EzTaxon-e database [26]. CLUSTAL W was used to generate alignments with comparative sequences collected from EzTaxon-e database [27]. The alignments were trimmed and converted to the MEGA 6.06 format before phylogenetic analysis. Phylogenetic inferences were made using Neighbor-joining method based on Tamura-Nei model within the MEGA 6.06 [28]. Phylogenetic tree indicated the taxonomic status of strain 5–2, clearly classified into the same branch with species E. mori type strain LMG 25706T (Figure 2).

Genome sequencing information

Genome project history

E. mori strain 5–4 was selected for whole genome sequencing on the consideration of its potential relevance to microbial enhanced oil recovery (MEOR). The genome project is deposited in the Genome On Line Database and the draft genome sequence is deposited in GenBank under the accession JFHW00000000 and consists of 36 contigs. A summary of the project information and its association with MIGS version 2.0 compliance are shown in Table 2[14].

Table 2 Project information

Growth conditions and DNA isolation

E. mori strain 5–4 was x-Bertani Broth. Cells in late-log-phase growth were harvested and lysed by EDTA, lysozyme, and detergent treatment, followed by proteinase K and RNase digestion. Genomic DNA was extracted using the DNeasy blood and tissue kit (Qiagen, Germany), according to the manufacturer’s recommended protocol. The quantity of DNA was measured by the NanoDrop Spectrophotometer and Cubit. Then 10 μg of DNA was sent to BGI (Shenzhen, China) for sequencing on a Hiseq2000 (Illumina, CA) sequencer.

Genome sequencing and assembly

Genomic DNA sequencing of E. mori strain 5–4 was performed using Solexa paired-end sequencing technology (HiSeq2000 system, Illumina). One DNA library was generated (450 bp insert size, with Illumina adapter at both end, detected by Agilent DNA analyzer 2100), then sequencing was performed with a 2 x 100 bp pair end sequencing strategy. Finally, a total of 6,652.30 M bp data was produced and quality control was performed with the following criteria: 1) Reads linkaged to adapters at both end were considered as sequencing artifacts then removed. 2) Bases with quality index lower than Q20 at both end was trimmed. 3) Reads with ambiguous bases (N) were removed. 4) Single qualified reads were discarded (In this situation, one read is qualified but its mate is not). Filtered 687.39 M clean reads were assembled into scaffolds using the Velvet version 1.2.07 with parameters “-scaffolds no” [29], then we use a PAGIT flow [30] to prolong the initial contigs and correct sequencing errors to arrive at a set of improved scaffolds.

Genome annotation

Predict genes were identified using Glimmer version 3.0 [31], tRNAscan-SE version 1.21 [32] was used to find tRNA genes, whereas ribosomal RNAs were found by using RNAmmer version 1.2 [33]. To annotate predict genes, we used HMMER version 3.0 [34] to align genes against Pfam version 27.0 [35] (only pfam-A was used) to find genes with conserved domains. KAAS server [36] was used to assign translated amino acids into KEGG Orthology [37] with SBH (single-directional best hit) method. Translated genes were aligned with COG database [38, 39] using NCBI blastp (hits should have scores no less than 60, e value is no more than 1e-6). To find genes with hypothetical or putative function, we aligned genes against NCBI nucleotide sequence database database (nt database was downloaded at Sep 20, 2013 ) by using NCBI blastn, only if hits have identity no less than 0.95, coverage no less than 0.9 , and reference gene had annotation of putative or hypothetical. To define genes with singnal peptide, we use SignaIP version 4.1 [40] to identify genes with signal peptide with default parameters. TMHMM 2.0 [41] was used to identify genes with transmembrane helices.

Genome properties

The draft genome sequence of E. mori strain 5–4 was assembled into 36 scaffolds with a assembly genome size of 4,621,281 bp and a G + C content of 56.2% (N 50 is 358,174 bp). These scaffolds contain 4317 coding sequences (CDSs), 60 tRNAs (excluding 0 Pseudo tRNAs) and incomplete rRNA operons (3 small subunit rRNA and 2 large subunit rRNAs). A total of 980 protein-coding genes were assigned as putative function or hypothetical proteins. 3625 genes were categorized into COGs functional groups (including putative or hypothetical genes). The properties and the statistics of the genome are summarized in Table 3 and Table 4.

Table 3 Genome statistics
Table 4 Number of genes associated with the general COG functional categories

Genome comparison

Genome alignment between E. mori 5–4 (JFHW00000000) and E. mori type strain LMG 25706 T (AEXB00000000) was performed by using Mauve [42]. Orthology identification was carried out by a modified method introduced by Lerat [43]. Genome alignment showed that some functional regions are highly homologous between these two assemblies. The alignment also reveals some discrepancies between them, some short stretches of LMG 25706 T genome absent from the contigs in 5–4 (Figure 3A). However, two alkane 1-monooxygenase, one alkanesulfonate monooxygenase, one putative alkanesulfonate transporter, one putative sulfate permease and one alkanesulfonate transporter permease subunit were identified in the genome. Alkane 1-monooxygenase was found as one of the key enzymes responsible for the aerobic transformation of n-alkanes [44]. Moreover, alkanesulfonate monooxygenase and alkanesulfonate transporter may be responsible for organosulfur compound degradation [45]. Comparison of these two strains revealed the presence of a large core-genome (Figure 3B). They shared 3555 CDS in the genome. In addition, 759 CDS from the 5–4 genome were classified as unique, while 1097 CDS from the LMG 25706 T genome were classified as unique. Our genomic data will provide an excellent platform for further improvement of this organism for potential application in bioremediation.

Figure 3

Genome comparison between E. mori 5–4 and E. mori LMG 25706 T . (A). Alignment is represented as local colinear blocks (colored) filled with a similarity plot. Height of the similarity plot indicates nucleotide identity of both assemblies; (B). Numbers inside the Venn diagrams indicate the number of genes found to be shared among the indicated genomes.


Here, we report the second draft genome sequence and description of E. mori, which was isolated from a mixture of formation water and crude-oil. The genome revealed two alkane 1-monooxygenase, one alkanesulfonate monooxygenase, one putative alkanesulfonate transporter, one putative sulfate permease and one alkanesulfonate transporter permease subunit. Our genomic data of strain 5-4 provide a vast pool of genes involved in hydrocarbon degradation and an excellent platform for further improvement of this organism for potential application in bioremediation of oil-contaminated environments. And further comparative genomic study between stain 5-4 and other Enterobacter strains will give us a better understanding of the evolution of environmental bacteria towards industrial application.


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This study was sponsored by the National Natural Science Foundation of China (Grant No. 81301461 and No. 51474034), 863 Program (Grant No. 2013AA064402) of the Ministry of Science and Technology, Zhejiang Provincial Natural Science Foundation of China (Grant No. LQ13H190002) and the Scientific Research Foundation of Zhejiang Provincial Health Bureau (Grant No. 2012KYB083).

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Correspondence to Fan Zhang or Sanbao Su or Beiwen Zheng or Yuehui She.

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The authors declare that they have no competing interests.

Authors’ contributions

FZ, SBS, GMY, FCS and BWZ performed the microbiology and molecular biology studies; FZ, BWZ, HD, and ZLW performed the sequencing, annotation and genomic analysis; BWZ, YHS, ZZZ and TSX wrote the manuscript. All authors read and approved the final manuscript.

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Zhang, F., Su, S., Yu, G. et al. High quality genome sequence and description of Enterobacter mori strain 5–4, isolated from a mixture of formation water and crude-oil. Stand in Genomic Sci 10, 9 (2015).

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  • Enterobacter mori strain 5–4
  • Formation water
  • Hydrocarbon degradation
  • Genome