Metagenome-Assembled Genome Sequence of Sulfuricurvum sp. Strain IAE1, Isolated from a 4-Chlorophenol-Degrading Consortium

The draft genome sequence of Sulfuricurvum sp. strain IAE1 was assembled and annotated from the metagenome of an anaerobically grown 4-chlorophenol-degrading consortium. The draft genome size is 2,338,235 bp with a G+C content of 52.6%.

S ulfur-oxidizing bacteria, such as Sulfuricurvum, are abundant in various environments and have essential roles in global sulfur cycling (1,2). Some Sulfuricurvum strains are capable of degrading toxic organic compounds such as polycyclic aromatic hydrocarbons and polychlorinated biphenyl (3). A metagenome data set was generated to investigate the role of Sulfuricurvum spp. involved in anaerobic 4-chlorophenol (4-CP) degradation.
In June 2017, top-layer sediment samples at 1.2-m depth were grabbed from a location (latitude 41°39=46Љ, longitude 123°6=20Љ) at the Xi River (Shenyang, Liaoning, China) using shovels and sealable glass containers. All sampling apparatuses were autoclaved before use. The sediment temperature and pH were 20°C and 6.6, respectively, at the sampling time. The 4-CP-degrading consortia were grown in 160-ml serum bottles filled with 100 ml defined mineral medium (4) at 30°C in the dark. 4-CP and hydrogen were provided as the carbon substrate and electron donor, respectively. The consortia were transferred (1%, vol/vol) every 2 months using presterilized, one-timeuse syringes and needles. Approximately 8.4 g DNA was extracted from 100 mg biomass using the cetyltrimethylammonium bromide method (https://1ofdmq2n8tc 36m6i46scovo2e-wpengine.netdna-ssl.com/wp-content/uploads/2014/02/JGI-Bacterial -DNA-isolation-CTAB-Protocol-2012.pdf). The library was prepared using a NovaSeq 6000 S4 kit, and sequencing was performed on a NovaSeq 6000 sequencer (Illumina, Inc., San Diego, CA, USA). The sequencing yielded a total of 158,000,142 reads at a 2 ϫ 150-bp paired-end read length. Sequences were trimmed using Trimmomatic version 0.36 (5) with default settings to remove adaptors and filter out poor-quality reads. Qualityfiltered reads were assembled with MEGAHIT version 1.1.1 (6). The draft genome sequence of a Sulfuricurvum strain named Sulfuricurvum sp. strain IAE1 was binned and assembled at an average 109.9ϫ coverage using the Rapid Annotations using Subsystems Technology (RAST) Binning Service (RBS) developed by the PATRIC Bacterial Bioinformatics Resource Center (http://patricbrc.org) (7) and was evaluated for its completeness (98%) and contamination (4.9%) using CheckM version 1.0.8 (8). This draft genome consists of 2,338,235 bp on 65 contigs (52.6% GϩC content). The N 50 value is 232,115 bp, and the largest contig is 752,227 bp. Gene annotation was performed using the Comprehensive Genome Analysis Pipeline with default parameters provided by PATRIC (9).
BLASTn analysis indicated that strain IAE1's 16S rRNA gene is closely related to that of Sulfuricurvum kujiense strain DSM 16994 (GenBank accession number NR_074398) and an environmental Sulfuricurvum 16S rRNA gene clone, D2CL (EU498374), with sequence similarities of 97.8% and 99.9%, respectively (10). Strain IAE1's genome harbors a soxABXYZ gene cluster encoding the subunits of a thiosulfate-oxidizing multienzyme complex (11,12) and genes encoding the Ni/Fe hydrogenase metallocenter assembly proteins HypABCDEF and the HyaA and HyaB subunits of quinonereactive Ni/Fe-hydrogenases (11,13,14). A BLASTp search found that the gene products mentioned above share more than 71% similarity to their homologs in Sulfuricurvum sp. strain MLSB (JQGL00000000) and Sulfuricurvum kujiense strain DSM 16994 (CP002355). Arsenate reductase gene arsC, arsenite efflux gene arsB, and regulatory gene arsR, as well as genes encoding cobalt/zinc/cadmium resistance proteins CzcCD, were also annotated, and such features may enable strain IAE1 to tolerate and detoxify heavy metals.
Data availability. The draft genome sequence of Sulfuricurvum sp. strain IAE1 has been deposited under GenBank accession number SLTI00000000. The whole-genome shotgun sequencing project has been deposited at DDBJ/ENA/GenBank under BioSample accession number SAMN11066887 and BioProject accession number PRJNA525737. The raw sequences have been deposited in the Sequence Read Archive (SRA) under the accession number SRS4850623.

ACKNOWLEDGMENTS
This study was supported by the National Natural Science Foundation of China (grant number 41673126) and the Hundred-Talent Program of the Chinese Academy of Sciences.