- Open Access
Complete genome sequence of Dehalobacter restrictus PER-K23T
Standards in Genomic Sciences volume 8, pages 375–388 (2013)
Dehalobacter restrictus strain PER-K23 (DSM 9455) is the type strain of the species Dehalobacter restrictus. D. restrictus strain PER-K23 grows by organohalide respiration, coupling the oxidation of H2 to the reductive dechlorination of tetra- or trichloroethene. Growth has not been observed with any other electron donor or acceptor, nor has fermentative growth been shown. Here we introduce the first full genome of a pure culture within the genus Dehalobacter. The 2,943,336 bp long genome contains 2,826 protein coding and 82 RNA genes, including 5 16S rRNA genes. Interestingly, the genome contains 25 predicted reductive dehalogenase genes, the majority of which appear to be full length. The reductive dehalogenase genes are mainly located in two clusters, suggesting a much larger potential for organohalide respiration than previously anticipated.
Dehalobacter restrictus strain PER-K23 (DSM 9455), is the type strain of the species Dehalobacter restrictus . Currently two pure cultures of D. restrictus have been described, namely D. restrictus strains PER-K23 and TEA [1,2].
We publish here the first full genome of a pure culture within the genus Dehalobacter and a preliminary comparison with a previously obtained metagenome from a co-culture containing Dehalobacter sp. strain E1 and Sedimentibacter sp .
Organohalide respiration (OHR) is considered as a key process in bioremediation of sites contaminated with organohalides such as tetrachloroethene (PCE) and trichloroethene (TCE), leading to a great interest in understanding the physiology and metabolism of organohalide respiring bacteria (OHRB). Most OHRBs are facultative organohalide respirers, capable of dehalogenating a limited number of halogenated compounds, as part of a versatile metabolism. This group consists of several genera, including Desulfitobacterium, Geobacter and Sulfurospirillum. Other isolates are obligate OHRB, among which isolates and enrichments of different Dehalococcoides mccartyi strains are the best studied. They have been shown to degrade a large variety of halogenated compounds solely using H2 as the electron donor. Until recently, the genus Dehalobacter had been thought to encompass exclusively obligate OHRB, however, at least some members of this genus have been described as able to ferment dichloromethane [4,5]. D. restrictus strain PER-K23 is an obligate OHRB, and like Dehalococcoides mccartyi, uses H2 as a sole electron donor. These similarities in physiology and ecology are noteworthy since Dehalobacter spp. are phylogenetically closely related to the metabolically versatile Desulfitobacterium spp.
D. restrictus strain PER-K23 was isolated from a packed bed column containing sediment from the river Rhine collected near Wageningen, the Netherlands, and granular sludge from a sugar refinery. This column had been fed with PCE for a prolonged period, prior to isolation of D. restrictus strain PER-K23 .
D. restrictus strain PER-K23 was chosen for genome sequencing because it is the type strain of the Dehalobacter restrictus species. Studying the genome gives an improved insight into the physiology and evolution of the genus Dehalobacter and may ultimately lead to unlocking its full potential for bioremediation.
Classification and features
Dehalobacter restrictus is a member of the phylum Firmicutes, class Clostridia, order Clostridiales, and family Peptococcaceae ,(Table 1). D. restrictus is closely related to the newly sequenced Dehalobacter sp. strain E1 , but grows in pure culture. Both Dehalobacter spp. and Desulfitobacterium spp. belong to the family Peptococcaceae (Figure 1). All members of this family are anaerobes, constituting a diverse group with respect to their metabolism and morphology . D. restrictus strain PER-K23 is a rod-shaped bacterium with a single lateral flagellum and has not been reported to form spores. It stains Gram-negative, even though it phylogenetically belongs to the Gram-positive Firmicutes, and does not have an outer membrane, indicating that it should be considered a Gram-positive . D. restrictus strain PER-K23 grows by coupling the oxidation of H2 to the reduction of PCE or TCE, growth has not been observed with any other electron donor or acceptor, nor has fermentative growth been shown [1,6]. D. restrictus strain PER-K23 requires iron as a trace element, the vitamins thiamine and cyanocobalamin, and the amino acids arginine, histidine and threonine for growth .
Genome project history
Growth conditions and DNA isolation
Dehalobacter restrictus strain PER-K23, DSM9455, was cultivated anaerobically as previously described . DNA was extracted from bacterial pellets using the protocol recommended by the JGI. In brief, cell walls were digested with lysozyme before DNA was purified with hexadecyltrimethylammonium bromide, phenol and chloroform, and precipitated with isopropanol. Quality and quantity of the obtained DNA were checked by running aliquots on agarose gels using lambda phage DNA as mass standard and HindIII digested lambda phage DNA as a size marker.
Genome sequencing and assembly
The draft genome of Dehalobacter restrictus PER-K23 was generated at the DOE Joint genome Institute (JGI) using a combination of Illumina , and 454 technologies . For this, genome we constructed and sequenced an Illumina GAii shotgun library which generated 77,929,756 reads totaling 5,922.7 Mb, and 1 paired end 454 library with an average insert size of 10 kb which generated 318,117 reads totaling 59.3 Mb of 454 data. All general aspects of library construction and sequencing performed at the JGI can be found at the JGI website . The initial draft assembly contained 90 contigs in 1 scaffold. The 454 paired end data were assembled together with Newbler, version 2.3-PreRelease-6/30/2009. The Newbler consensus sequences were computationally shredded into 2 kb overlapping fake reads (shreds). Illumina sequencing data was assembled with VELVET, version 1.0.13 , and the consensus sequence were computationally shredded into 1.5 kb overlapping fake reads (shreds). We integrated the 454 Newbler consensus shreds, the Illumina VELVET consensus shreds and the read pairs in the 454 paired end library using parallel phrap, version SPS - 4.24 (High Performance Software, LLC). The software Consed [29–31] was used in the following finishing process. Illumina data was used to correct potential base errors and increase consensus quality using the software Polisher developed at JGI (Alla Lapidus, unpublished). Possible mis-assemblies were corrected using gapResolution (Cliff Han, unpublished), Dupfinisher , or sequencing cloned bridging PCR fragments with subcloning. Gaps between contigs were closed by editing in Consed, by PCR and by Bubble PCR (J-F Cheng, unpublished) primer walks. A total of 134 additional reactions were necessary to close gaps and to raise the quality of the finished sequence. The total size of the genome is 2,943,336 bp and the final assembly is based on 24.6 Mb of 454 draft data which provides an average 8.5× coverage of the genome and 348 Mb of Illumina draft data which provides an average 120× coverage of the genome.
Genes of D. restrictus strain PER-K23 were identified using Prodigal  as part of the Oak Ridge National Laboratory genome annotation pipeline, followed by a round of manual curation using the JGI GenePRIMP pipeline . 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. Non-coding DNA and miscellaneous features were predicted using tRNAscan-SE , RNAMMer , Rfam , TMHMM , and signalP .
The genome consists of a single chromosome with a total size of 2,943,336 bp with 45% G+C content. A total of 2,908 genes were predicted, 2,826 of which are protein-coding genes. Genes with putative function corresponded to 76.7% (2,168), of all protein coding sequences with the remaining annotated as hypothetical proteins. In addition, 1,174 protein coding genes belong to 356 paralogous families in this genome. The properties and the statistics of the genome are summarized in Tables 3,4 and 5.
Insights from genome sequencing
Reductive dehalogenase paralogs
The genome of D. restrictus contains 25 loci predicted to code for proteins with sequence homology to reductive dehalogenases (RDHs). Among these 25 genes, one is a partial sequence and four are truncated due to possible frame-shift mutations (Table 5). This high number is in contrast to those found to date for metabolically versatile organohalide respirers. These possess a limited number of RDHs typically in the range of 1 to7 [43,44]. The number of RDHs in D. restrictus lies in the same range as seen in specialized organohalide respirers, such as Dehalococcoides mccartyi strains and Dehalogenimonas lykanthroporepellens, which have been predicted to possess between 10 and up to 36 RDHs [45,46].
For D. restrictus however, this finding is intriguing since, PCE and TCE, currently, are the only electron acceptors known to be utilized by strain PER-K23 . The identification of a total of 25 rdhA genes suggests that D. restrictus possesses a much larger potential for OHR metabolism, than previously anticipated.
The majority of the rdhA genes are located in two clusters, one on each chromosome arm, with all but two RDHs being encoded on the leading strand. Cluster A is approximately 54 kb long, located on the right chromosome arm and contains 10 reductive dehalogenase genes including two truncated ones. Cluster B is approximately 61 kb long, located on the left chromosome arm and contains 11 reductive dehalogenase genes, of which two appear truncated (Table 5 & Figure 2).
The remaining three complete RDH genes and one partial RDH encoding gene are scattered throughout the genome (Table 5 & Figure 2). A similar pattern has previously been observed in the genomes of Dehalococcoides mccartyi strains, where the majority of the RDHs are located on each side of, and close to the origin of replication . These regions were described as high plasticity regions, where frequent events of rearrangement and horizontal gene transfer are thought to occur. It was suggested that these regions enable fast adaptation to dehalogenation of new organohalides, while at the same time protecting key metabolic functions from being disrupted by horizontal gene transfer events .
We identified transcriptional regulators of the CRP/FNR type being encoded by genes in the vicinity of most of the RDH encoding genes, with PceA (encoded by Dehre_2398) as a notable exception . A regulator of this type has been demonstrated to regulate the expression of the genes that code for chlorophenol reductive dehalogenase (cpr operon in Desulfitobacterium dehalogenans and Desulfitobacterium hafniense strain DCB-2 . The presence of transcriptional regulator genes close to almost all rdhA genes suggest that their transcription is regulated. This was confirmed by a recent study looking at transcription of rdh genes and the proteome of Dehalobacter restrictus strain PER-K23 growing in the presence of H2 and PCE. In this study we found that PceA (encoded by Dehre_2398) was highly present at both RNA and proteomic level, whereas the remaining RDHs and the corresponding transcripts were either not detected at all or at very low levels, suggesting that the RDH encoding genes are tightly regulated, and probably only expressed in the presence of their specific substrate .
Recently the draft genome of Dehalobacter sp. strain E1 was published . This genome contains nine potentially functional rdhA genes, and one pseudogene. Six of these are conserved between D. restrictus strain PER-K23 and strain E1 (Table 5). Two of the conserved rdhA genes are located at the edge of cluster A and one at the edge of cluster B. Interestingly all four rdhA genes present outside cluster A or B are conserved between the two strains, which may indicate that both cluster A and B represent high plasticity regions unique to D. restrictus (Table 5). Currently, pceA (encoded by Dehre_2398) is the only RDH-encoding gene from Dehalobacter restrictus to be characterized in detail. The corresponding gene product PceA has been shown to catalyze the reduction of PCE to TCE and TCE to cis-DCE, the only two electron acceptors demonstrated to support growth of D. restrictus [1,42]. The pceA gene belongs to a gene cluster, pceABCT (Dehre_2395-2398), which is highly similar to a gene cluster identified in a composite transposon structure identified in several Desulfitobacterium strains [50–52]. The transposon structure is not conserved in D. restrictus although the gene cluster is flanked by sequences resembling transposase genes in a late state of decay (Dehre_2394 and 2399). This combined with the fact that the pceABCT gene cluster including the cryptic transposases and the surrounding genomic context are conserved between D. restrictus and D. strain E1 (data not shown) suggest that the presence of pceABCT is the result of an ancient horizontal gene transfer event.
Corrinoid synthesis and uptake
Corrinoid is the key cofactor in characterized RD catalytic subunits. Dehalobacter restrictus strain PER-K23 requires vitamin B12 in the medium for growth .
Therefore it is noteworthy to report the presence of a full set of corrinoid biosynthesis genes in the genome of D. restrictus, although cbiH (Dehre_2856) encoding precorrin-3B C17-methyltransferase displays a frame-shift mutation, and consequently is annotated as a pseudogene. The vitamin B12 synthesis pathway is encoded by two distinct gene clusters in D. restrictus strain PER-K23, where Dehre_2848-2865 encode enzymes of the upper pathway, and Dehre_1606-1615 the lower pathway. One additional gene (Dehre_1488) belonging to the lower pathway is located elsewhere in the genome (Figure 2) . The genome encodes several gene clusters associated with corrinoid uptake and salvaging pathways. Preliminary studies of the proteome from cultures grown at standard conditions or with partial vitamin B12 depletion showed that gene products encoded by one of the salvaging pathways (Dehre_0281-0291) were much more abundant in the vitamin B12 starved cells than in the cells grown under standard concentrations (J. Maillard and T. Kruse unpublished data). These findings suggest that the de novo corrinoid synthesis pathway is not functional and that Dehalobacter restrictus strain PER-K23 is dependent on salvaging corrinoids from the environment.
Another interesting feature is the presence of genes predicted to code for eight different hydrogenases. These include three periplasmic membrane-bound Ni/Fe uptake hydrogenases, consisting of three subunits: a catalytic unit, an Fe/S cluster protein and a membrane-bound b-type cytochrome (Dehre_551-553, 1061–1063 and 2405–2007), two six-subunits membrane-bound energy-conserving Ni/Fe hydrogenases (Dehre_1568-1573 and 1645–1650), and three Fe-only hydrogenases (Dehre_1739-1741, 2317–2320 and 2372–2374). The Fe-only hydrogenases consist of the catalytic subunit and two to three putative electron transferring subunits.
The presence of multiple uptake hydrogenases has also been observed in Desulfitobacterium spp., whereas Dehalococcoides mccartyi strains only have one uptake hydrogenase [43,44,53]. The two six-subunits Ni/Fe resemble the Hyc and Ech complexes found in Dehalococcoides mccartyi strain 195 , as well as the Hyc complex found in Desulfitobacterium spp [43,44,55].
Disrupting either one uptake hydrogenase or the six-subunits energy-conserving hydrogenase in Desulfitobacterium dehalogenans led to loss of the ability to grow using lactate or formate as electron donor and 3-chloro-4-hydroxyphenylacetate as electron acceptor, indicating that hydrogenases may play an important role in the electron transport chain to RD catalytic subunits, even when hydrogen is not used as the initial electron donor .
The role of the six-subunit hydrogenase complexes are still poorly understood. It has been speculated that they play a role in generating low potential electrons for OHR by reverse electron flow. However, this was considered as unlikely in one study where Dehalococcoides mccartyi strain 195 was cultivated in the presence of varying concentrations of hydrogen . The exact role of the different hydrogenases in Dehalobacter restrictus strain PER-K23 still needs further studies.
The genome also encodes an intact Wood-Ljungdahl pathway (Dehre_0130-0155 and 2348–2351). The presence of a whole or partial Wood-Ljungdahl pathway has been observed in other OHRB. The closely related Desulfitobacterium hafniense strains Y51 and DCB-2 both contain genes predicted to encode a full Wood-Ljungdahl pathway, and strain DCB-2 has been shown to fix CO2 [43,44]. The more distantly related Dehalococcoides mccartyi strains have been shown to contain partial Wood-Ljungdahl pathways, but its exact role in the metabolism of these organisms remains unclear [57,58].
The genome of D. restrictus contains 72 genes annotated as encoding transposases or inactive derivatives thereof, whereas it only contains few phage-associated genes despite the lack of a CRISPR phage immunity system.
Cells of Dehalobacter restrictus strain PER-K23 are motile . The genome contains genes for synthesis of flagella and several genes predicted to be involved in chemotaxis. The role of chemotaxis in OHRB is currently understudied. Chemotactic behavior towards metals has been described for Geobacter, some members of this genus have been shown to be OHRB. Chemotactic behavior towards organohalides has, however, not been described for Geobacter spp [59–61].
The presence of an unexpectedly large number of putative RDH encoding genes suggests a far larger potential for use in bioremediation than previously anticipated, especially if Dehalobacter restrictus strain PER-K23 is attracted by organohalides in a chemotactic manner. The complete genome sequence of Dehalobacter restrictus strain PER-K23, the type strain of the genus Dehalobacter, represents a significant leap towards understanding the physiology, ecology and evolution of this specialized organohalide respiring group of bacteria. Current work focuses on obtaining a deeper understanding of the expression and regulation of the RDH genes, and thereby expanding the known organohalide substrate range of this organism. Shot-gun proteome analysis will aid in deciphering the metabolism of D. restrictus strain PER-K23 and allow generation of refined genome scale metabolic models of these dedicated degraders.
organohalide respiring bacteria
reductive dehalogenase homologue
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The work of Thomas Kruse and Hauke Smidt were supported by the Netherlands Genomics Initiative as well as the European Community’s Seventh Framework Programme (FP7/ 2007–2013) through the Ecogenomics program and the BACSIN and METAEXPLORE projects (grant agreements No. 211684 and 222625), respectively. The work conducted by the U.S. Department of Energy Joint Genome Institute is supported by the Office of Science of the U.S. Department of Energy under contract No. DE-AC02-05CH11231.
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Kruse, T., Maillard, J., Goodwin, L. et al. Complete genome sequence of Dehalobacter restrictus PER-K23T. Stand in Genomic Sci 8, 375–388 (2013). https://doi.org/10.4056/sigs.3787426
- Dehalobacter restrictus type strain
- organohalide respiration
- reductive dehalogenases