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High quality permanent draft genome sequence of Chryseobacterium bovis DSM 19482T, isolated from raw cow milk


Chryseobacterium bovis DSM 19482T (Hantsis-Zacharov et al., Int J Syst Evol Microbiol 58:1024-1028, 2008) is a Gram-negative, rod shaped, non-motile, facultative anaerobe, chemoorganotroph bacterium. C. bovis is a member of the Flavobacteriaceae, a family within the phylum Bacteroidetes. It was isolated when psychrotolerant bacterial communities in raw milk and their proteolytic and lipolytic traits were studied. Here we describe the features of this organism, together with the draft genome sequence and annotation. The DNA G + C content is 38.19%. The chromosome length is 3,346,045 bp. It encodes 3236 proteins and 105 RNA genes. The C. bovis genome is part of the Genomic Encyclopedia of Type Strains, Phase I: the one thousand microbial genomes study.


Chryseobacterium bovis DSM 19482 T (=LMG 24227 T; CIP 110170 T), was isolated by Hantsis-Zacharov and Halpern [1] from raw cow milk when psychrotolerant bacterial communities in raw milk, and their proteolytic and lipolytic traits, were studied. This study revealed that 5% out of the culturable psychrotolerant bacterial communities belonged to the genus Chryseobacterium . Chryseobacterium bovis proliferates at low temperatures and produce heat-stable proteolytic and lipolytic enzymes which remain active after the milk pasteurization process. This may be a limiting factor in maintaining the flavor quality of fluid milk and its products [1]. Strain C. bovis H9T DSM 19482 T was isolated in April 2004 from a modern farm equipped with automated milking facilities in northern Israel [2]. Three novel psychrotolerant Chryseobacterium species were isolated and identified from raw milk in the same study [1]: C. bovis , C. haifense and C. oranimense [2,3,4]. The genus Chryseobacterium [5] is a member of the family Flavobacteriaceae and currently consists of about 100 species with Chryseobacterium gleum as the type species. Species belonging to this genus exist in diverse environments such as milk, water, sludge, soil, animals, insects, plants and human samples [2, 6].

Here we describe a summary classification and a set of the features of the species C. bovis , together with the permanent draft genome sequence description and annotation of the type strain (DSM 19482 T).

Organism information

Classification and features

C. bovis strain DSM 19482 T shares typical characteristics of Chryseobacterium such as Gram-negative staining, occurrence as chemoheterotrophic rods and positive catalase and oxidase reactions. The strain contains flexirubin-type pigments, which are also typical for Chryseobacterium [2] (Table 1). The phylogenetic tree based on the 16S rRNA, also supports the fact that strain DSM 19482 T belongs to Chryseobacterium genus (Fig. 1).

Table 1 Classification and general features of Chryseobacterium bovis DSM 19482T according to the MIGS recommendations [25], published by the Genome Standards Consortium [26] and the Names for Life database [27]
Fig. 1
figure 1

Phylogenetic tree highlighting the position of Chryseobacterium bovis relative to type species within the genus Chryseobacterium. Maximum likelihood (ML) tree inferred under the GTR + CAT model and rooted with Elizabethkingia. The branches are scaled in terms of the expected number of substitutions per site. The numbers above the branches are support values when larger than 60% from ML (left) and maximum parsimony (MP, right) bootstrapping. Phylogenies were inferred by the GGDC web server [34] available at ( using the DSMZ phylogenomics pipeline [35] adapted to single genes. A multiple sequence alignment was created with MUSCLE [36]. ML and MP trees were inferred from the alignment with RAxML [37] and TNT [38], respectively. For ML, rapid bootstrapping in conjunction with the autoMRE bootstopping criterion [39] and subsequent search for the best tree was used; for MP, 1000 bootstrapping replicates were used in conjunction with tree-bisection-and-reconnection branch swapping and ten random sequence addition replicates

Cells of C. bovis strain DSM 19482 T are non-motile rods, measuring 0.5–0.9 μm in width and 1.1–2.3 μm in length (Fig. 2). After 48 h incubation on standard plate-count agar (SPC) at 30 °C in the dark, colonies are circular with entire edges, opaque, smooth and cream-colored. When light is provided during growth, colonies are yellow-colored because of the production of carotenoid-type pigments (absorbance peaks at 454 and 481 nm). They also contain small amounts of flexirubin-type pigments [2,3,4].

Fig. 2
figure 2

Electron micrograph of negatively stained cells of Chryseobacterium bovis strain DSM 19482T. Cells are nonflagellated rods. Bar, 2 μm

Growth is observed under anaerobic conditions on SPC agar containing 0.1% (w/v) potassium nitrate but not on SPC agar with the addition of 0.5% glucose (indicating that glucose is not fermented) [2]. The strain grows at 7–37 °C (optimum, 30–32 °C), with 0–2.5% NaCl (optimum, 0–1.75%) and at pH 5.0–9.8 (optimum, pH 6.5–8.5) (Table 1). C. bovis does not grow on MacConkey or cetrimide agar. Casein, aesculin and tributyrin are hydrolysed. Glucose, mannose, maltose, arabinose, mannitol, N-acetylglucosamine, gluconate and adipic and malic acids are assimilated. Acid is produced from D-glucose, maltose, D-lactose and D-mannose. Acetoin is produced; gelatin is hydrolyzed; H2S and indole are not produced; urea is not hydrolyzed; citrate is not utilized; and arginine dihydrolase, lysine and ornithine decarboxylases and tryptophan deaminase activities are absent. Alkaline and acid phosphatases, esterase (C4), esterase lipase (C8), leucine arylamidase, valine arylamidase, naphthol-AS-BI-phosphohydrolase, α-glucosidase, ß-galactosidase and cystine arylamidase activities are present [2].

Chemotaxonomic data

The major fatty acids of the type strains are: iso-C15:0; antesio-C15:0 and iso-C17:0 3OH. Some strains in this species also possess iso-C17:0 ω9c as a major fatty acid [2].

Genome sequencing information

Genome project history

This organism was selected for sequencing based on its phylogenetic position [7] and is part of the study Genomic Encyclopedia of Type Strains, Phase I: the one thousand microbial genomes project [8]. The goal of the KMG-I study is to increase the coverage of sequenced reference microbial genomes [9]. The project is registered in the Genomes OnLine Database [10] and the permanent draft genome sequence is deposited in GenBank. Draft sequencing and assembly were performed at the DOE Joint Genome Institute ( using state of the art sequencing technology [11]. A summary of the project information is shown in Table 2.

Table 2 Genome sequencing project information

Growth conditions and genomic DNA preparation

A culture of DSM 19482 T was grown aerobically in DSMZ medium 381 [12] at 28 °C. Genomic DNA was isolated using a Jetflex Genomic DNA Purification Kit (GENOMED 600100) following the standard protocol provided by the manufacturer. DNA is available from the DSMZ through the DNA Bank Network [13].

Genome sequencing and assembly

The draft genome was generated at the DOE Joint genome Institute (JGI) using the Illumina technology [14]. An Illumina std shotgun library was constructed and sequenced using the Illumina HiSeq 2000 platform which generated 7,888,518 reads totaling 1183.3 Mb. All general aspects of library construction and sequencing performed at the JGI can be found at ( All raw Illumina sequence data was passed through DUK, a filtering program developed at JGI, which removes known Illumina sequencing and library preparation artifacts [15]. Following steps were then performed for assembly: (1) filtered Illumina reads were assembled using Velvet (version 1.2.07) [16], (2) 1–3 kb simulated paired end reads were created from Velvet contigs using wgsim (, (3) Illumina reads were assembled with simulated read pairs using Allpaths–LG (version r46652) [17]. Parameters for assembly steps were: (1) Velvet (velveth: 63 –shortPaired and velvetg: –very clean yes –exportFiltered yes –min contig lgth 500 –scaffolding no –cov cutoff 10) (2) wgsim (–e 0 –1 100 –2 100 –r 0 –R 0 –X 0) (3) Allpaths–LG (PrepareAllpathsInputs: PHRED 64 = 0 PLOIDY = 1 FRAG COVERAGE = 125 JUMP COVERAGE = 25 LONG JUMP COV = 50, RunAllpathsLG: THREADS = 8 RUN = std shredpairs TARGETS = standard VAPI WARN ONLY = True OVERWRITE = True). The final draft assembly contained 101 contigs in 96 scaffolds, totalling 3.3 Mb in size. The final assembly was based on 1152.3 Mb of Illumina data. 230.5X input read coverage was used for the final assembly.

Genome annotation

Genes were identified using Prodigal [18], as part of the DOE-JGI genome annotation pipeline [19]. The predicted CDSs were translated and used to search the National Center for Biotechnology Information (NCBI) nonredundant database, UniProt, TIGRFam, Pfam, KEGG, COG and InterPro databases. The tRNAScanSE tool [20] was used to find tRNA genes, whereas ribosomal RNA genes were found by searches against models of the ribosomal RNA genes built from SILVA [21]. Other non–coding RNAs such as the RNA components of the protein secretion complex and the RNase P were identified by searching the genome for the corresponding Rfam profiles using INFERNAL [22]. Additional gene prediction analysis and manual functional annotation was performed within the Integrated Microbial Genomes (IMG) platform [23] developed by the Joint Genome Institute, Walnut Creek, CA, USA.

Genome properties

The assembly of the draft genome sequence consists of 96 scaffolds amounting to 3,346,045 bp, and the G + C content is 38.19% (Table 3). Of the 3341 genes predicted, 3236 were protein-coding genes, and 105 RNAs. The majority of the protein-coding genes (69.95%) 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.

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

Insights from the genome sequence

C. bovis DSM 19482 T showed the ability to hydrolyze casein and tributyrin [2] and these traits can also be observed in its genome. The following protease genes were detected: Membrane-associated serine protease, rhomboid family; ATP-dependent Clp protease ATP-binding subunit ClpB; Do/DeqQ family serine protease; ATP-dependent Clp protease ATP-binding subunit ClpX and transglutaminase-like enzyme, putative cysteine protease; ATP-dependent Lon protease (Lon functions in the cytosol) and cell division protease FtsH. The lipolytic properties of C. bovis DSM 19482 T are evident from the presence of the following genes: phospholipase/carboxylesterase; esterase/lipase superfamily enzyme and GDSL-like lipase/acylhydrolase.

C. bovis DSM 19482 T is producing carotenoid-type pigments under light conditions. Indeed, genes which are part of the carotenoid biosynthesis are found in its genome: phytoene desaturase (lycopene-forming), phytoene desaturase (neurosporene-forming), phytoene desaturase (zeta-carotene-forming), all-trans-zeta-carotene desaturase and beta-carotene 3-hydroxylase.

C. bovis DSM 19482 T was able to grow under anaerobic conditions when nitrate was provided. This ability is supported by the presence of the following genes: MFS transporter, NNP family, nitrate/nitrite transporter (two genes) and assimilatory nitrate reductase catalytic subunit.

Gliding motility properties are reflected by the presence of the genes that are exclusive to the Bacteroidetes phylum such as gliding motility-associated lipoprotein GldK and gliding motility-associated lipoprotein GldH. Another gene that supports the motility feature is the chemotaxis protein MotB gene.

Among the genes found in C. bovis DSM 19482 T genome are genes for resistance to different components. For example a gene for multidrug resistance protein, MATE family. Members of the Multi-Antimicrobial Extrusion (MATE) family function as drug/sodium antiporters. These proteins mediate resistance to a wide range of cationic dyes, fluroquinolones, aminoglycosides and other structurally diverse antibodies and drugs. These proteins are predicted to have twelve alpha-helical transmembrane regions. The Strain DSM 19482 T genome, also possesses a gene for cobalt-zinc-cadmium resistance protein CzcA. CzcA has a low cation-transport activity for cobalt and is essential for the expression of cobalt, zinc and cadmium resistance. Another gene found in the genome is a tellurite resistance protein TerC. TerC has been implicated in resistance to tellurium, and may be involved in efflux of tellurium ions. The quaternary ammonium compound-resistance protein SugE gene that is found in C. bovis DSM 19482 T genome encodes an efflux pump which confers resistance to cetylpyridinium, cetyldimethylethyl ammonium and cetrimide cations.

Resistance to antibiotics is revealed by the following genes: glycopeptide antibiotics resistance protein (plays a role in resistance to glycopeptide antibiotics such as vancomycin); MFS transporter, DHA1 family; tetracycline resistance protein gene; and Fusaric acid resistance protein-like gene, which is involved in the resistance (detoxification) of the fungal toxin Fusaric acid.

A gene for putative auto-transporter adhesin head GIN domain demonstrates the function of cell adhesion. Two genes indicate the possibility of C. bovis DSM 19482 T to produce a capsule, capsular exopolysaccharide family protein and polysaccharide export outer membrane protein.


In the current study we characterized the genome of C. bovis strain DSM 19482 T that was isolated from raw cow milk [2]. C. bovis is a psychrotolerant bacterium which can grow at 7 °C, although its optimal growth temperature is higher (30–32 °C). After milk collection, the milk is kept in cold storage, and psychrotolerants dominate the bacterial flora. These bacteria possess extracellular enzymes, mainly proteases and lipases which contribute to the spoilage of dairy products, as their enzymes can resist pasteurization [1]. The C. bovis DSM 19482 T genome demonstrates that indeed, this genome encodes proteases and lipases which may play a role in milk products spoilage.

C. bovis strain DSM 19482 T produces a carotenoid pigment, a feature that was also observed for C. haifense [3], but not for other species in this genus. This trait could be used for the commercial production of carotene.

C. bovis DSM 19482 T genome demonstrated the strains' potential to produce a multidrug-resistance protein, resistance to cobalt, zinc, cadmium, tellurite, cetylpyridinium, cetyldimethylethyl ammonium and cetrimide cations as well as resistance to glycopeptide antibiotics, tetracycline and resistance to the fungal toxin fusaric acid. The whole-genome sequence of C. oranimense G311, a strain that was isolated from a cystic fibrosis patient, also demonstrated multi-drug resistance [24]. Indication for a capsule-forming ability was apparent in both C. bovis DSM 19482 T and C. oranimense G311. Sharma et al. [24] suggested that the resistance of C. oranimense G311 to colistin maybe due to the production of capsular polysaccharides.



Genomic encyclopedia of Bacteria and Archaea


One thousand microbial genomes


Minimum information about a genome sequence






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This project has been supported by the Community Sequencing Program of the U.S. Department of Energy’s Joint Genome Institute. The sequencing, assembly and automated genome analysis work at the DOE-JGI was supported by the Office of Science of the U.S. Department of Energy under contract no. DE-AC02-05CH11231. This work was also supported in part by a grant from the German Research Foundation (DFG, the Deutsche Forschungsgemeinschaft, GZ: HO 930/5-1 and 930/5-2.; Prof. Malka Halpern). We are grateful to Andrea Schütze for growing cells and to Meike Döppner for preparing gDNA (both at DSMZ).

Authors’ contributions

MH isolated and characterized strain DSM 19482T SL, MG, NCK, HPK and MH drafted the manuscript. MG, MH, AC, MP, KP, NV, NM, DS, TBK, CD, NS, VM, NI, TW and NCK sequenced, assembled and annotated the genome. All authors read and approved the final manuscript.

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The authors declare that they have no competing interests.

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Correspondence to Malka Halpern.

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Laviad-Shitrit, S., Göker, M., Huntemann, M. et al. High quality permanent draft genome sequence of Chryseobacterium bovis DSM 19482T, isolated from raw cow milk. Stand in Genomic Sci 12, 31 (2017).

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  • Flavobacteriaceae
  • Psychrotolerant
  • Proteolysis
  • Lipolysis
  • Beta-carotene