Draft Genome Sequence of the Type Strain Sphingopyxis bauzanensis DSM 22271.

We present here the draft genome sequence of Sphingopyxis bauzanensis DSM 22271. The assembly contains 4,258,005 bp in 28 scaffolds and has a GC content of 63.3%. A series of specific genes involved in the catabolism or transport of aromatic compounds was identified.

GENOME ANNOUNCEMENT

The members of the genus Sphingopyxis (family Sphingomonadaceae) have been isolated from chemically contaminated environments, mainly oil- and petrol-polluted soil and water (1, 2). Microorganisms from the family Sphingomonadaceae have the ability to use polycyclic aromatic hydrocarbons as a sole carbon source (3). Here, we present the draft genome sequence of Sphingopyxis bauzanensis type strain DSM 22271 (=BZ30, =CGMCC 1.8959, =CIP 110136), isolated from hydrocarbon-contaminated soil (4); this is the only representative genome of this species. Because it was collected from a contaminated environment, we were interested in genes encoding proteins responsible for hydrocarbon degradation.

Genomic DNA was isolated as previously described (5). Illumina paired-end (with an average insert size of 450 bp) and Nextera mate pair libraries (with an average insert size of 8 kb) were prepared according to the manufacturer’s protocols (a KAPA HTP DNA library preparation kit for Illumina sequencing and a Nextera mate pair sample prep kit, respectively). Whole-genome sequencing of S. bauzanensis strain DSM 22271T was performed using the Illumina MiSeq platform (2 × 300 bp) and resulted in 487,322 paired reads for the paired-end library and 2,039,112 paired reads for the mate pair library. Reads from the paired-end library were processed as follows: adapters were removed using the Cutadapt script (6), and then the reads were filtered by length (>50 bp) and quality (Q value >30) (7). The mate pair reads were processed with NxTrim (8). Assembly was done using SPAdes version 3.9.1 (9). Contigs longer than 1 kb were deposited in GenBank and annotated using NCBI PGAP (10). The assembly consists of 28 scaffolds containing 4,258,005 bp with a GC content of 63.3%. The DSM 22271T genome consists of 4,136 predicted genes, of which, 3,932 are protein-coding genes. The DSM 22271T genome has 52 RNA genes, 46 tRNAs, 3 rRNAs, and 3 noncoding RNAs (ncRNAs), and 204 pseudogenes.

Twenty-six dioxygenases were predicted in the analyzed genome sequence, of which 13 were encoded on a single scaffold, number 6. This scaffold contains 68 open reading frames encoding proteins thought to be associated with the catabolism or active transport of aromatic compounds. Scaffold 6 is flanked with integrase-encoding genes, suggesting that it is a part of a catabolic transposon. Deeper analysis of proteins encoded on scaffold 6 showed their high similarity to proteins from a catabolic module described already on plasmid pNL1 from Novosphingobium aromaticivorans F199 (formerly Sphingomonas aromaticivorans F199) (11). The genes associated with biphenyl, xylene, and naphthalene degradation identified in S. bauzanensis strain DSM 22271T were situated in a similar orientation to the pNL1 plasmid instead of in one major rearrangement. The genes bphD, bphE, and bphF, together with coenzyme A-transferase, were localized upstream of the bphB gene, separating the bphB sequence from xylA. Such gene rearrangements result in a concentration of the catabolic enzymes in the genome compared to pNL1.

Preliminary studies of the S. bauzanensis DSM 22271T genome sequence suggest that this strain is well adapted for degradation of high-molecular-weight polycyclic aromatic hydrocarbons and has potential in the bioremediation of polluted environments.

Accession number(s).

This whole-genome shotgun project has been deposited at DDBJ/ENA/GenBank under the accession no. NISK00000000. The version described in this paper is the first version NISK01000000.