- Open Access
Genome sequence of the pink to light reddish-pigmented Rubellimicrobium mesophilum type strain (DSM 19309T), a representative of the Roseobacter group isolated from soil, and emended description of the species
© The Author(s) 2014
Published: 15 June 2014
Rubellimicrobium mesophilum Dastager et al. 2008 is a mesophilic and light reddish-pigmented representative of the Roseobacter group within the alphaproteobacterial family Rhodobacteraceae. Representatives of the Roseobacter group play an important role in the marine biogeochemical cycles and were found in a broad variety of marine environments associated with algal blooms, different kinds of sediments, and surfaces of invertebrates and vertebrates. Roseobacters were shown to be widely distributed, especially within the total bacterial community found in coastal waters, as well as in mixed water layers of the open ocean. Here we describe the features of R. mesophilum strain MSL-20T together with its genome sequence and annotation generated from a culture of DSM 19309T. The 4,927,676 bp genome sequence consists of one chromosome and probably one extrachromosomal element. It contains 5,082 protein-coding genes and 56 RNA genes. As previously reported, the G+C content is significantly different from the actual genome sequence-based G+C content and as the type strain tests positively for oxidase, the species description is emended accordingly. The genome was sequenced as part of the activities of the Transregional Collaborative Research Centre 51 (TRR51) funded by the German Research Foundation (DFG).
Strain MSL-20T (= DSM 19309T = KCTC 22012T) is the type strain of the species Rubellimicrobium mesophilum , one of four species with validly published names in the genus Rubellimicrobium [2,3]; the other three species in the genus are R. thermophilum , R. aerolatum  and R. roseum . Rubellimicrobium belongs to the abundant marine Roseobacter group . The species epithet mesophilum refers to the Greek adjective mesos, middle, as well as from the Neo-Latin adjective ‘philus –a –um’, friend/loving , the middle (temperature-) loving. Strain MSL-20T was isolated from soil located at Bigeum Island, Republic of Korea , whereas the other type strains within the genus Rubellimicrobium were isolated from a paper mill (R. thermophilum ), air (R. aerolatum ) and forest soil (R. roseum ), which indicates rather diverse habitats for Rubellimicrobium. Current PubMed records do not indicate any follow-up research with strain MSL-20T since the initial description of R. mesophilum . Here we present a summary classification and a set of features for R. mesophilum MSL-20T, together with the description of the complete genomic sequencing and annotation.
Classification and features
16S rRNA gene analysis
The genomic 16S rRNA gene sequence of R. mesophilum DSM 19309T was compared with the Greengenes database for determining the weighted relative frequencies of taxa and (truncated) keywords as previously described . The most frequently occurring genera were Paracoccus (45.3%), Loktanella (30.3%), Rubellimicrobium (14.0%), Methylarcula (8.4%) and ‘Pararubellimicrobium’ (2.0%) (58 hits in total). Regarding the five hits to sequences from other members of the genus, the average identity within HSPs was 94.9%, whereas the average coverage by HSPs was 99.3%. Among all other species, the one yielding the highest score was ‘Pararubellimicrobium aerilata’ (EU338486), which corresponded to an identity of 96.3% and a HSP coverage of 98.0%. (Note that the Greengenes database uses the INSDC (=EMBL/NCBI/DDBJ) annotation, which is not an authoritative source for nomenclature or classification). The highest-scoring environmental sequence was JF417792 (Greengenes short name ‘microbial structures coalbeds located Eerduosi Basin China coalbed clone QQSB73’), which showed an identity of 98.7% and a HSP coverage of 99.6%. The most frequently occurring keywords within the labels of all environmental samples which yielded hits were ‘skin’ (10.6%), ‘fossa’ (5.9%), ‘poplit’ (4.2%), ‘forearm, volar’ (3.3%) and ‘sea’ (2.8%) (192 hits in total). Environmental samples which yielded hits of a higher score than the highest scoring species were not found, indicating that R. mesophilum has rarely been detected in the environment.
Morphology and physiology
Species Rubellimicrobium mesophilum
carbohydrates, amino acids
Bigeum island (Republic of Korea)
Sample collection time
The principal cellular fatty acids of strain MSL-20T are C16:0 (36.9%), C18:1 ω7c (36.5%), 11-methyl C18:1 ω7c (12.4%), C18:0 (3.6%), C10:0 (1.3%), C12:0 (1.3%) and C17:0 (1.2%) and differ significantly from those detected in R. thermophilum. The major respiratory lipoquinone is ubiquinone Q-10, which is a common feature of alphaproteobacterial representatives (all data from ).
Genome sequencing and annotation
Genome project history
The genome of strain R. mesophilum DSM 19309T was first selected for genome sequencing in phase I of the one thousand microbial genomes (KMG-I) project , an extension of the Genomic Encyclopaedia of Bacteria and Archaea (GEBA) , but ultimately sequenced within the DFG funded project “Ecology, Physiology and Molecular Biology of the Roseobacter clade: Towards a Systems Biology Understanding of a globally Important Clade of Marine Bacteria”. The strain was chosen for genome sequencing according to a phylogeny-driven target selection procedure for large scale genome-sequencing (and other) projects as routinely used for the KMG-I project [20,22].
Genome sequencing project information
Two genomic libraries: one Illumina PE library (420 bp insert size), one 454 PE library (3 kb insert size)
Illumina GA II×, Illumina MiSeq, 454 GS-FLX+Titanium
Velvet version 1.1.36, Newbler version 2.3, Consed 20.0
Gene calling method
GenBank Date of Release
NCBI project ID
Source material identifier
Tree of Life, biodiversity
Growth conditions and DNA isolation
A culture of DSM 19309T was grown aerobically in DSMZ medium 830 (R2A medium)  at 28°C. Genomic DNA was isolated using Jetflex Genomic DNA Purification Kit (GENOMED 600100) following the standard protocol provided by the manufacturer, but modified by an incubation time of 60 min, an overnight incubation on ice on a shaker, the use of additional 50 µl proteinase K, and the addition of 100 µl protein precipitation buffer. DNA is available from DSMZ through the DNA Bank Network .
Genome sequencing and assembly
The genome was sequenced using a combination of two libraries (Table 2). The paired-end library contained inserts of an average of 420 bp in length. Illumina sequencing was performed on a GA IIx platform with 150 cycles. The first run on the Illumina GA IIx platform delivered 3.6 million reads. In order to increase the sequencing depth, a second Illumina run was performed, providing another 7.0 million reads. Error correction and clipping were performed by fastq-mcf  and quake . The data was assembled using Velvet . The first draft assembly from 5,400,234 filtered reads (median read length of 132 nt) resulted in more than 143 unordered contigs. To gain information about the contig arrangement an additional 454 run was performed. The paired-end jumping library of 3 kb insert size was sequenced on 1/8 of a lane. Pyrosequencing resulted in 102,695 reads with an average read length of 199 bp, assembled with Newbler (Roche Diagnostics). The resulting assembly consisted of 261 scaffolds. Both draft assemblies (Illumina and 454 sequences) were fractionated into artificial Sanger reads of 1,000 nt in length plus 75 bp overlap on each site. These artificial reads served as an input for the phred/phrap/consed package . By manual editing, 138 contigs could be assembled on 127 scaffolds. The combined sequences provided a 129× coverage of the genome.
Genes were identified using Prodigal  as part of the JGI genome annotation pipeline. The predicted CDSs were translated and used to search the National Center for Biotechnology Information (NCBI) non-redundant database, UniProt, TIGR-Fam, Pfam, PRIAM, KEGG, COG, and InterPro databases. Identification of RNA genes was carried out by using HMMER 3.0rc1  (rRNAs) and tRNAscan-SE 1.23  (tRNAs). Other non-coding genes were predicted using INFERNAL 1.0.2 . Additional gene prediction analysis and functional annotation was performed within the Integrated Microbial Genomes - Expert Review (IMG-ER) platform . CRISPR elements were detected using CRT  and PILER-CR .
% of Total
Genome size (bp)
DNA coding region (bp)
DNA G+C content (bp)
Number of scaffolds MIGS-9
Extrachromosomal elements MIGS-10
Genes with function prediction (proteins)
Genes in paralog clusters
Genes assigned to COGs
Genes assigned Pfam domains
Genes with signal peptides
Genes with transmembrane helices
Number of genes associated with the general COG functional categories
Translation, ribosomal structure and biogenesis
RNA processing and modification
Replication, recombination and repair
Chromatin structure and dynamics
Cell cycle control, cell division, chromosome partitioning
Signal transduction mechanisms
Cell wall/membrane/envelope biogenesis
Intracellular trafficking and secretion, and vesicular transport
Posttranslational modification, protein turnover, chaperones
Energy production and conversion
Carbohydrate transport and metabolism
Amino acid transport and metabolism
Nucleotide transport and metabolism
Coenzyme transport and metabolism
Lipid transport and metabolism
Inorganic ion transport and metabolism
Secondary metabolites biosynthesis, transport and catabolism
General function prediction only
Not in COGs
Insights into the genome
General genomic location and features of the chromosomal and one extrachromosomal replicon from R. mesophilum strain DSM 19309T.
The 119 kb RepB type plasmid contains a post-segregational killing system (PSK) consisting of a typical operon with two small genes encoding a stable toxin and an unstable antitoxin (rumesco_01477/78 ;).
Phages are widely distributed and abundant in marine and freshwater environments [38–40] and are known to be horizontal gene transfer agents that drive bacterial diversity [40,41]. Temperate phage genomes can be integrated in the host genome as prophages and perform a symbiotic relationship with their hosts .
Several phage-associated gene sequences were detected in the genome sequence of strain DSM 19309T, particularly in “genomic islands” (e.g., rumeso_00405, rumeso_00407 rumeso_01586 to rumeso_01600).
Several Gram-negative bacteria produce and release chemical signal molecules called autoinducers. In correlation to the population density they detect those signal molecules and respond with an alteration of gene expression and therefore with diverse behaviors (e.g., luminescence, virulence, antibiotic resistance, changes in morphology and cell division) [43–46].
Genome analysis of strain DSM 19309T revealed the presence of gene-encoding sequences associated with the mechanism of quorum sensing e.g. N-homoserine-lactone synthetase, rumeso_02218 (LuxI homologue); probably involved in response and transcriptional regulators, rumeso_02217 (luxR homologue).
Unlike many representatives of the Roseobacter group , R. mesophilum DSM 19309T encodes no genes involved in the harvesting of light and photoheterotrophic growth, which reflect its occurrence in niches within soil that are characterized by the absence of light. Nevertheless, the annotated genome sequence reveals a high metabolic versatility that was not expected by the phenotypic characterization presented in the species description .
The genome encodes a large number of diverse ABC transporters facilitating the uptake of various substrates like carbohydrates (e.g., rumeso_04497 to 04500), polyamines (e.g., rumeso_04716 to 04719), peptides (e.g., rumeso_00087 to 00090), amino acids (e.g., rumeso_00231 to 00234) and sulfonates (e.g., rumeso_05058 to 05059). Sulfonates could represent unexpected but common substrates for this species. The organic sulfonates taurine and cysteic acid are widely distributed in animal tissue and can enter soil by feces. In some soil bacteria, these compounds are used as sole source of carbon, nitrogen and sulfur . Indeed, a complete degradation pathway for taurine was detected in the genome of strain DSM 19309T. Taurine is first converted by a taurine-pyruvate aminotransferase (rumeso_05057) to sulfoacetaldehyde, which in turn is cleaved by the enzyme sulfoacetaldehyde acetyltransferase (rumeso_03970) into sulfite and acetyl-phosphate. Acetyl-phosphate can be either converted to acetyl-CoA by a phosphotransacetylase (rumeso_03968) and funneled into the intermediary metabolism or is used for the generation of ATP by the enzyme acetate kinase (rumeso_03967). The potentially toxic compound sulfite can be oxidized to sulfate by various sulfite oxidases (e.g., rumeso_03951).
In addition, the utilization of electron acceptors seems to be variable and not restricted to oxygen. Genes encoding at least two predicted cytochrome c oxidases, one of the cbb3-type (rumeso_00470 to 00472) and the other of the aa3-type (rumeso_02204 to 02206), which terminate the electron transport chain with oxygen, were detected. However, according to the species description strain MSL-20T should be oxidase negative , we have found that the oxidase test for this strain is positive, which is in line with the results of the genome analysis.
Under periodic anoxic conditions that frequently occur in wet soils, nitrate could be used as alternative electron acceptor. According to the genome sequence, the denitrification pathway of this strain is probably incomplete and terminates with the greenhouse gas nitrous oxide (N2O), as has been previously demonstrated for Ottowia thiooxydans . Only genes encoding a respiratory nitrate reductase (rumeso_02471 to 02474), nitrite reductase (rumeso_02669) and nitric oxide reductase (rumeso_00142 to 00145) were detected, whereas no genes for the terminal nitrous oxide reductase were found.
Comparison of Rubellimicrobium genomes
Recently the genome sequence of the type strain for second representative of the genus Rubellimicrobium, R. thermophilum DSM 16684T became available . Lifestyle, habitat and preferred temperature range of R. thermophilum differ significantly from the ones of R. mesophilum . The genome sequences of both strains were compared using the digital DNA-DNA hybridization (dDDH) tool GGDC server version 2.0, an online tool provided through the DSMZ web pages . The resulting dDDH value of 19.3 ± 2.3% according to distance formula 2 (as described in ), confirmed that both strains belong to independent species.
Although both genomes differ significantly in size (3.2 Mbp for R. mesophilum and 4.9 Mbp for R. thermophilum), the proportions of genes per COG category is very similar (Table 3 and ). The IMG Abundance Profile  demonstrated some differences, however. Enzymes for transport and utilization of amino acids and polyamines (COG1173, COG0747, COG3842) were present in higher abundance in R. thermophilum, which is in agreement with the results from wet-lab substrate tests [1,3]. Huge differences in the abundance of proteins can be found within the class of transposases (COG2801, COG 3436, COG2936, COG0665, COG0404). While R. thermophilum codes for two transposases, more than 30 tranposase genes were identified in R. mesophilum. Combined with the presence of the site-specific recombinase XerD (involved in the recombination of plasmids ) this indicates a high level of genetic recombination within R. mesophilum. Furthermore, 23 genes coding for RTX toxins and Ca+-binding proteins (COG 2931) were found. These proteins are structurally diverse, playing an important role in the colonization of various habitats and surfaces . Additionally, 14 proteins of the xenobiotic-degrading glutathion-S-transferases were present in R. mesophilum. The occurrence of these proteins may enable the bacteria to grow in polluted areas.
The G +C content of the genomic DNA of strain MSL-20T is given in the species description as 72.3 mol% , which represents a discrepancy of more than 2% from the value of 69.7 mol% deduced from the genome sequence. In addition to the deviant oxidase test this calls for an emendation of the species description according to the proposal of Meier-Kolthoff et al. .
Emended description of the species Rubellimicrobium mesophilum Dastager et al. 2008
The description of the species Rubellimicrobium mesophilum is the one given by Dastager et al. 2008 , with the following modifications.
Oxidase test is positive. The G+C content, rounded to zero decimal places, is 70%.
The authors gratefully acknowledge Evelyne Brambilla (DSMZ) for DNA extraction and quality control. This work was performed under the auspices of the German Research Foundation (DFG) Transregio-SFB 51 Roseobacter grant.
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