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Standards in Genomic Sciences

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Genome sequence of the orange-pigmented seawater bacterium Owenweeksia hongkongensis type strain (UST20020801T)

  • Thomas Riedel1, 5,
  • Brittany Held2, 3, 5,
  • Matt Nolan2, 5,
  • Susan Lucas2, 5,
  • Alla Lapidus2, 5,
  • Hope Tice2, 5,
  • Tijana Glavina Del Rio2, 5,
  • Jan-Fang Cheng2, 5,
  • Cliff Han2, 3, 5,
  • Roxanne Tapia2, 3, 5,
  • Lynne A. Goodwin2, 3, 5,
  • Sam Pitluck2, 5,
  • Konstantinos Liolios2, 5,
  • Konstantinos Mavromatis2, 5,
  • Ioanna Pagani2, 5,
  • Natalia Ivanova2, 5,
  • Natalia Mikhailova2, 5,
  • Amrita Pati2, 5,
  • Amy Chen4, 5,
  • Krishna Palaniappan4, 5,
  • Manfred Rohde1, 5,
  • Brian J. Tindall5, 6,
  • John C. Detter2, 3, 5,
  • Markus Göker5, 6,
  • Tanja Woyke2, 5,
  • James Bristow2, 5,
  • Jonathan A. Eisen2, 5, 7,
  • Victor Markowitz4, 5,
  • Philip Hugenholtz2, 5, 8,
  • Hans-Peter Klenk5, 6Email author and
  • Nikos C. Kyrpides2, 5
Standards in Genomic Sciences20127:7010120

Published: 10 October 2012


Owenweeksia hongkongensis Lau et al. 2005 is the sole member of the monospecific genus Owenweeksia in the family Cryomorphaceae, a poorly characterized family at the genome level thus far. This family comprises seven genera within the class Flavobacteria. Family members are known to be psychrotolerant, rod-shaped and orange pigmented (β-carotene), typical for Flavobacteria. For growth, seawater and complex organic nutrients are necessary. The genome of O. hongkongensis UST20020801T is only the second genome of a member of the family Cryomorphaceae whose sequence has been deciphered. Here we describe the features of this organism, together with the complete genome sequence and annotation. The 4,000,057 bp long chromosome with its 3,518 protein-coding and 45 RNA genes is a part of the Genomic Encyclopedia of Bacteria and Archaea project.


aerobicmotilerod-shapedmesophilicnon-fermentativeGram-negativeorange-pigmented sea water Bacteroidetes Flavobacteria Cryomorphaceae GEBA


Strain UST20020801T (= DSM 17368 = NRRL B-23963 = JCM 12287) is the type strain of the species Owenweeksia hongkongensis [1] in the monotypic genus Owenweeksia [1]. The genus was named after Owen B. Weeks for his work on Flavobacterium and Cytophaga during the 1950s to 1970s [1]. The species epithet points to Hong Kong, P. R. China, the place where the stain was isolated [1]. Strain UST20020801T was first isolated in August 2002 from seawater samples collected from Port Shelter in Hong Kong during a study of the bacterial diversity in Hong Kong coastal sea water. Members of the phylum Bacteroidetes are widely distributed in marine and freshwater ecosystems. Compared to free-living bacteria, they were more frequently attached to aggregates [2,3] and occurred during algae blooms [4,5]. Representatives of the phylum Bacteroidetes, especially of the class Flavobacteria, are well-known to efficiently degrade and consume high-molecular-mass organic matter [611]. Recently, the family Cryomorphaceae was proposed to constitute a branch within the phylum Bacteroidetes [12]. This family encompasses the marine genera Brumimicrobium, Cryomorpha, Crocinitomix [12], Owenweeksia [1], Lishizhenia [13], Wandonia [14], and “Phaeocystidibacter” [15] as well as the freshwater-living genus Fluviicola [16]. Here we present a summary classification and a set of features for O. hongkongensis UST20020801T, together with the description of the genomic sequencing and annotation.

Classification and features

A representative genomic 16S rRNA sequence of O. hongkongensis UST20020801T was compared using NCBI BLAST [17,18] under default settings (e.g., considering only the high-scoring segment pairs (HSPs) from the best 250 hits) with the most recent release of the Greengenes database [19]. The relative frequencies of taxa and keywords (reduced to their stem [20]) were determined, weighted by BLAST scores. The only named genus in the list was Owenweeksia (1 hit in total). Regarding the single hit to a sequence from members of the species, the average identity within HSPs was 99.9%, whereas the average coverage by HSPs was 99.8%. No hits to sequences with other species names were found. (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 EU328017 (‘dynamics during bioremediation crude oil contaminated moderate saline soil clone B76’), which showed an identity of 93.2% and an HSP coverage of 99.9%. The most frequently occurring keywords within the labels of all environmental samples which yielded hits were ‘marine’ (3.0%), ‘lake’ (2.9%), ‘depth’ (2.7%), ‘water’ (2.6%) and ‘zone’ (2.5%) (249 hits in total) and corresponded with the habitat from which strain UST20020801T was isolated.

Figure 1 shows the phylogenetic neighborhood of O. hongkongensis in a 16S rRNA based tree. The sequences of the two identical 16S rRNA gene copies in the genome do not differ from the previously published 16S rRNA sequence (AB125062).
Figure 1.

Phylogenetic tree highlighting the position of O. hongkongensis relative to the type strains of the other species within the family Cryomorphaceae. The tree was inferred from 1,409 aligned characters [21,22] of the 16S rRNA gene sequence under the maximum likelihood (ML) criterion [23]. Rooting was done initially using the midpoint method [24] and then checked for its agreement with the current classification (Table 1). The branches are scaled in terms of the expected number of substitutions per site. Numbers adjacent to the branches are support values from 400 ML bootstrap replicates [25] (left) and from 1,000 maximum-parsimony bootstrap replicates [26] (right) if larger than 60%. Lineages with type strain genome sequencing projects registered in GOLD [27] are labeled with one asterisk, those also listed as ‘Complete and Published’ with two asterisks [28].

O. hongkongensis UST20020801T is a Gram-negative, halophilic, non-flagellated, motile, and rod-shaped bacterium (Figure 2) [1]. Colonies are orange, convex, smooth, glistening and translucent with an entire margin [1]. Cells are 0.3–0.5 µm in width and 0.5–4.0 µm in length [1]. The strain does not sporulate [1]. Cells are strictly aerobic heterotrophs requiring Na+, Mg2+, sea salts and yeast extract or peptone for growth [1]. Growth occurs between 4°C and 37°C with an optimum at 25°C-33°C [1]. The pH range for growth is 5.2–9.0 with an optimum at pH 6.0–8.0 [1]. The salinity range for growth is 1.0–7.5% NaCl as well as 15–100% sea-water [1]. Yeast extract, peptone or starch is required for growth [1]. Ampicillin (10 µg), chloramphenicol (30 µg), erythromycin (10 µg), penicillin G (2U), rifampicin (10 µg), streptomycin (10 µg), tetracycline (30 µg) and polymyxin B (300 U) inhibited growth whereas cells were resistant to kanamycin (10 µg), gentamycin sulphate (10 µg) and spectinomycin (10 µg) [1]. Cells contain oxidase, catalase and alkaline phosphatase [1].
Figure 2.

Scanning electron micrograph of O. hongkongensis UST20020801T


The fatty-acid profile of strain UST20020801T differs significantly from those of other members of the Cryomorphaceae [1]. The principal cellular fatty acids of strain UST20020801T were the following saturated branched-chain fatty acids: iso-C15:0 G (28.0%), iso-C15:0 (18.7%), iso-C17:0 3-OH (18.1%), iso-C17:1 ω9c (7.3%), iso-C15:0 3-OH (4.9%), and a summed feature containing iso-C15:0 2-OH and/or C16:1ω7c (10.0%) [1]. Strain UST20020801T had the highest level of iso-C17:0 3-OH within Cryomorphaceae. Compared with other members of the Cryomorphaceae, the strain most similar to strain UST20020801T with respect to the content of straight-chain fatty acids and branched-chain hydroxy fatty acids is Cryomorpha ignava 1–22T [1]. In addition to phosphatidylethanolamine as major polar lipid, six unidentified lipids, one unidentified aminolipid, one unidentified aminophospholipid and one unidentified glycolipid were found in strain UST20020801T [15]. MK-6 was detected as a major respiratory quinone in strain UST20020801T [1].

Genome sequencing and annotation

Genome project history

This organism was selected for sequencing on the basis of its phylogenetic position [41], and is part of the Genomic Encyclopedia of Bacteria and Archaea project [42]. The genome project is deposited in the Genomes On Line Database [27] and the complete genome sequence is deposited in GenBank. Sequencing, finishing and annotation were performed by the DOE Joint Genome Institute (JGI). A summary of the project information is shown in Table 2.
Table 1.

Classification and general features of O. hongkongensis UST20020801T according to the MIGS recommendations [29] and NamesforLife [30].




Evidence code


Current classification

Domain Bacteria

TAS [31]


Phylum Bacteroidetes

TAs [32,33]


Class Flavobacteria

TAS [3436]


Order Flavobacteriales

TAS [33,37,38]


Family Cryomorphaceae

TAS [12]


Genus Owenweeksia

TAS [1]


Species Owenweeksia hongkongensis

TAS [1]


Strain UST20020801

TAS [1]


Gram stain


TAS [1]


Cell shape


TAS [1]




TAS [1]




TAS [1]


Temperature range

mesophile, 4–37°C

TAS [1]


Optimum temperature


TAS [1]



1.0–7.5% NaCl (w/v), 0–100% sea water

TAS [1]


Oxygen requirement


TAS [1]


Carbon source

yeast extract, peptone, starch

TAS [1]


Energy metabolism


TAS [1]




TAS [1]


Biotic relationship


TAS [1]






Biosafety level


TAS [39]



sea water (sand-filtered)

TAS [1]


Geographic location

Port Shelter, Hong Kong, China

TAS [1]


Sample collection time

August 2002

TAS [1]











5 m

TAS [1]



not reported


Evidence codes - TAS: Traceable Author Statement (i.e., a direct report exists in the literature); NAS: Non-traceable Author Statement (i.e., not directly observed for the living, isolated sample, but based on a generally accepted property for the species, or anecdotal evidence). Evidence codes are from the Gene Ontology project [40].

Table 2.

Genome sequencing project information





Finishing quality



Libraries used

Three genomic libraries: one 454 pyrosequence standard library, one 454 PE library (8.5 kb insert size), one Illumina library


Sequencing platforms

Illumina GAii, 454 GS FLX Titanium


Sequencing coverage

300.0 × Illumina; 8.6 × pyrosequence



Newbler version 2.3-PreRelease-6/30/2009, Velvet 1.0.13, phrap version SPS - 4.24


Gene calling method






GenBank Date of Release

June 15, 2012





NCBI project ID



Database: IMG-GEBA



Source material identifier

DSM 17368


Project relevance

Tree of Life, GEBA

Growth conditions and DNA isolation

O. hongkongensis strain UST20020801T, DSM 17368, was grown in DSMZ medium 1168 (YPS medium) [43] at 30°C. DNA was isolated from 0.5–1 g of cell paste using Jetflex Genomic DNA Purification kit (GENOMED 600100) following the standard protocol as recommended by the manufacturer with an extended cell-lysis procedure, i.e. incubation with additional 80 µl protease K for one hour at 58°C. DNA is available through the DNA Bank Network [44].

Genome sequencing and assembly

The genome was sequenced using a combination of Illumina and 454 sequencing platforms. All general aspects of library construction and sequencing can be found at the JGI website [45]. Pyrosequencing reads were assembled using the Newbler assembler (Roche). The initial Newbler assembly, consisting of 39 contigs in one scaffold, was converted into a phrap [46] assembly by making fake reads from the consensus to collect the read pairs in the 454 paired end library. Illumina GAii sequencing data (5,738.3 Mb) was assembled with Velvet [47] and the consensus sequences were shredded into 1.5 kb overlapped fake reads and assembled together with the 454 data. The 454 draft assembly was based on 81.1 Mb 454 draft data and all of the 454 paired end data. Newbler parameters are -consed -a 50 -l 350 -g -m -ml 20. The Phred/Phrap/Consed software package [46] was used for sequence assembly and quality assessment in the subsequent finishing process. After the shotgun stage, reads were assembled with parallel phrap (High Performance Software, LLC). Possible mis-assemblies were corrected with gapResolution [45], Dupfinisher [48], or sequencing cloned bridging PCR fragments with subcloning. Gaps between contigs were closed by editing in Consed, by PCR and by Bubble PCR primer walks (J.-F. Chang, unpublished). A total of 58 additional reactions were necessary to close gaps and to raise the quality of the finished sequence. Illumina reads were also used to correct potential base errors and increase consensus quality using the software Polisher developed at JGI [49]. The error rate of the completed genome sequence is less than 1 in 100,000. Together, the combination of the Illumina and 454 sequencing platforms provided 308.6 x coverage of the genome. The final assembly contained 291,505 pyrosequence and 75,503,620 Illumina reads.

Genome annotation

Genes were identified using Prodigal [50] as part of the Oak Ridge National Laboratory genome-annotation pipeline, followed by a round of manual curation using the JGI GenePRIMP pipeline [51]. The predicted CDSs were translated and used to search the National Center for Biotechnology Information (NCBI) non-redundant database, UniProt, TIGRFam, Pfam, PRIAM, KEGG, COG, and InterPro databases. These data sources were combined to assert a product description for each predicted protein. Additional gene prediction analysis and functional annotation was performed within the Integrated Microbial Genomes - Expert Review (IMG-ER) platform [52].

Genome properties

The genome consists of a 4,000,057 bp long circular chromosome with a G+C content of 40.2% (Figure 3 and Table 3). Of the 3,563 genes predicted, 3,518 were protein-coding genes, and 45 RNAs; 33 pseudogenes were also identified. The majority of the protein-coding genes (67.9%) were assigned a putative function while the remaining ones were annotated as hypothetical proteins. The distribution of genes into COGs functional categories is presented in Table 4.
Figure 3.

Graphical map of the chromosome. From outside to center: Genes on forward strand (colored by COG categories), Genes on reverse strand (colored by COG categories), RNA genes (tRNAs green, rRNAs red, other RNAs black), GC content (black), GC skew (purple/olive).

Table 3.

Genome Statistics



% of Total

Genome size (bp)



DNA coding region (bp)



DNA G+C content (bp)



Number of replicons



Extrachromosomal elements



Total genes



RNA genes



rRNA operons



tRNA genes



Protein-coding genes



Pseudo genes



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



CRISPR repeats


Table 4.

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




Nuclear structure




Defense mechanisms




Signal transduction mechanisms




Cell wall/membrane biogenesis




Cell motility








Extracellular structures




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




Function unknown




Not in COGs

Insights into the genome sequence

Genome analysis of strain UST20020801T revealed the presence of genes encoding an arylsulfatase A family protein (Oweho_0043), a bacteriophytochrome (light-regulated signal transduction histidine kinase (Oweho_0350), a cytochrome c2 and a cytochrome c oxidase cbb3 type (Oweho_2085)). Additional gene sequences of interest encode a homogenisate 1,2-dioxigenase (Oweho_2010), a haloacid dehalogenase superfamily protein (Oweho_2094) as well as a 2-haloalkanoic acid dehalogenase type II (Oweho_2503). The presence of these genes could indicate that strain UST20020801T plays a role in the respiratory degradation of recalcitrant compounds in its ecological niche. Further, a light-dependent regulation of metabolic activities using bacteriophytochrome as a sensor seems to be possible.



The authors would like to gratefully acknowledge the help of Helga Pomrenke for growing O. hongkongensis cultures and Evelyne-Marie Brambilla for DNA extraction and quality control (both at DSMZ). This work was performed under the auspices of the US Department of Energy Office of Science, Biological and Environmental Research Program, and by the University of California, Lawrence Berkeley National Laboratory under contract No. DE-AC02-05CH11231, Lawrence Livermore National Laboratory under Contract No. DE-AC52-07NA27344, and Los Alamos National Laboratory under contract No. DE-AC02-06NA25396, UT-Battelle and Oak Ridge National Laboratory under contract DE-AC05-00OR22725, as well as German Research Foundation (DFG) INST 599/1-2 and Transregio-SFB 51 Roseobacter.

Authors’ Affiliations

HZI - Helmholtz Centre for Infection Research, Braunschweig, Germany
DOE Joint Genome Institute, Walnut Creek, USA
Bioscience Division, Los Alamos National Laboratory, Los Alamos, USA
Biological Data Management and Technology Center, Lawrence Berkeley National Laboratory, Berkeley, USA
Oak Ridge National Laboratory, Oak Ridge, USA
Leibniz Institute DSMZ - German Collection of Microorganisms and Cell Cultures, Braunschweig, Germany
University of California Davis Genome Center, Davis, USA
Australian Centre for Ecogenomics, School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Australia


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