Open access
15 June 2017

Draft Genome Sequence of Pseudoruegeria sp. SK021, a Representative of the Marine Roseobacter Group, Isolated from North Sea Sediment


Pseudoruegeria sp. SK021 is a member of the Roseobacter group, isolated under aerobic conditions from North Sea sediment. The draft genome comprises 3.95 Mb and contains 3,747 protein-coding sequences. Although the strain is nonmotile under laboratory conditions, the entire set of genes for the formation of a flagellar apparatus was found.


The Roseobacter group is globally distributed in the marine environment and represents a significant part of pelagic and benthic microbial communities (13). Their broad metabolic versatility make roseobacters successful in a variety of habitats (4, 5). In coastal sediments, roseobacters can constitute up to 10% of all cells (6). Although 28% of all described species in this group are of benthic origin (7), the metabolic properties of roseobacters in sediments are poorly understood. Pseudoruegeria sp. SK021, analyzed in this study, was isolated from surface sediment of the North Sea (7.1667 E, 57.8145 N) at a water depth of 181 m below sea level (8). It is closely related to P. aestuarii and represents a new benthic member of this genus.
Pseudoruegeria sp. SK021 was grown on marine broth agar (Difco) amended with dimethyl sulfide (100 µM) and lactate (5 mM) at 20°C. DNA was extracted using the innuPREP DNA mini kit (Analytik Jena) and a sequencing library was prepared using the Nextera XT kit (Illumina). Genome sequencing was performed using the Illumina MiSeq platform with the MiSeq reagent kit version 3 and generated approximately 3.8 million reads, representing ~0.98 Gb of data (fastq-stats version 1.01, ). Reads were trimmed and adapters removed using Trimmomatic version 0.36 (9) with the following parameters: CROP:288, HEADCROP:19, SLIDINGWINDOW:4:20, MINLEN:100, ILLUMINACLIP:bbmap/adapters.fa:2:40:15. Paired reads were assembled with SPAdes version 3.9.1 (10) using “--careful” and multiple k-mer sizes (-k 21, 33, 55, 77, 99, 127). Only contigs with a G+C content of 40 to 68%, an average read coverage > 7.5×, and a minimum size of 200 bp were retained to eliminate potential contamination. After decontamination, the assembled draft genome of Pseudoruegeria sp. SK021 had a total length of 3,948,746 bp, 128 contigs (>500 bp), and approximately 245-fold coverage. The average G+C content was 60.17% and the N50 length was 94,596 bp, as determined by QUAST version 4.3 (11). Genome completeness was 99.27%, estimated by CheckM version 1.0.7 (12) using marker genes for the family Rhodobacteraceae. Annotation by Prokka version 1.12-beta (13), on the basis of three published and annotated genomes of Pseudoruegeria spp., identified 3,747 protein-coding sequences, 3 rRNA-encoding sequences (5S, 16S, 23S rRNA), and 48 tRNAs. Even though Pseudorugeria sp. SK021 is nonmotile, genes for the formation of the complete flagellar apparatus were found in the annotated genome, including genes for the motor switch (e.g., FliG, FliM, MotA), the basal body (e.g., FlgB, FlgC), the different rings (FliF, FlgH, FlgI), the flagellar hook (e.g., FlgE, FlgK, FlgL), and the flagella itself (flagellin). Although motility is not essential in sediments, the presence of flagellar genes shows that the strain might be motile under specific conditions.

Accession number(s).

The genome was uploaded to IMG under Genome ID 2711768631. Furthermore, this whole-genome shotgun project has been deposited at DDBJ/ENA/GenBank under the accession number MTBG00000000 . The version described in this paper is the first version, MTBG01000000.


We acknowledge Saranya Kanukollu and Jana Schmidt (both University of Oldenburg), for isolating the strain and for providing support during the cultivation, and Britta Poulsen (Aarhus University) for performing the Illumina MiSeq sequencing. This study was funded by the Deutsche Forschungsgemeinschaft (DFG) within the Transregional Collaborative Research Center TRR51 and the Graduate School of Science and Technology, University of Oldenburg. Furthermore, the Aarhus University Graduate School of Science and Technology, the Danish National Research Foundation (grant no. DNRF104), an ERC Advanced Grant MICROENERGY (grant no. 294200), and a Marie Curie IIF fellowship “ATP_adapt_low_energy” (both European Union Seventh Framework Programs) supported this work financially.


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Information & Contributors


Published In

cover image Genome Announcements
Genome Announcements
Volume 5Number 2415 June 2017
eLocator: 10.1128/genomea.00541-17


Received: 27 April 2017
Accepted: 2 May 2017
Published online: 15 June 2017



Marion Pohlner
Institute for Chemistry and Biology of the Marine Environment, University of Oldenburg, Oldenburg, Germany
Ian Marshall
Department of Bioscience, Center for Geomicrobiology, Aarhus University, Aarhus, Denmark
Lars Schreiber
Department of Bioscience, Center for Geomicrobiology, Aarhus University, Aarhus, Denmark
Heribert Cypionka
Institute for Chemistry and Biology of the Marine Environment, University of Oldenburg, Oldenburg, Germany
Bert Engelen
Institute for Chemistry and Biology of the Marine Environment, University of Oldenburg, Oldenburg, Germany


Address correspondence to Bert Engelen, [email protected].

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