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Draft genome sequence of a novel Rhodospirillaceae strain HT1-32 isolated from seawater
Korean J. Microbiol. 2019;55(4):465-467
Published online December 31, 2019
© 2019 The Microbiological Society of Korea.

Ji-Sung Oh and Dong-Hyun Roh*

Department of Microbiology, Chungbuk National University, Cheongju 28644, Republic of Korea
Correspondence to: *E-mail: dhroh@chungbuk.ac.kr;
Tel.: +82-43-261-3368; Fax: +82-43-264-9600
Received November 25, 2019; Revised December 6, 2019; Accepted December 16, 2019.
Abstract

Here we report the draft genome sequence of the bacterial strain HT1-32, isolated from coastal seawater of South Sea, Korea. As a result, the draft genome was comprised of a total length of approximately 4.42 Mbp with G + C content of 57.5%, and included a total of 4,042 protein-coding genes, 5 rRNA genes, 47 tRNA genes, 4 non-coding RNA genes, and 34 pseudo genes. Based on analysis of genome sequence and comparison of 16S rRNA gene sequence, strain HT1-32 is assumed to contribute nitrogen and sulfur cycling in seawater and to be a novel strain belonged to the family Rhodospirillaceae.

Keywords : draft genome sequence, family Rhodospirillaceae, Illumina HiSeq, strain HT1-32
Body

The family Rhodospirillaceae, the so-called purple non- sulfur bacteria, elonging to the order Rhodospirillales of the class Alphaproteobacteria, currently comprises 44 genera (List of Prokaryotic Names with Standing in Nomenclature; http:// www.bacterio.net). Members of the family Rhodospirillaceae were isolated from various habitats, including rhizosphere, sand soil, activated sludge, seawater, saline mud, salt mine, freshwater and wastewater. These members characterized as gram-negative, rod to spirillum-shaped bacteria possessing ubiquinones 9, 10, and 11 and/or menaquinone 10 as major respiratory lipoquinones and reported to have various metabolic and nutritional properties such as photoheterotrophs, photoautotrophs, and chemoheterotrophs (Baldani et al., 2014).

The seawater sample was collected from coastal seawater, Tongyeong of Korea, in July 2017. The strain HT1-32 was isolated from seawater, using a standard dilution plating method on marine agar 2216 (MA; Difco), and routinely cultured on MA or marine broth 2216 (MB; Difco) at 25°C for 5 days. The analysis of 16S rRNA gene sequence of strain HT1-32 showed that most closely related to Aliidongia dinghuensis 7M-Z19T, a member of the family Rhodospirillaceae, with 90.0% sequence identity (http://www.ezbiocloud.net/identify).

The genomic DNA of strain HT1-32 was extracted using MagAttract® HMW DNA kit (Qiagen) and the sequencing of the draft genome was performed on the Illumina Hiseq platform by Macrogen Inc. Quality checking of sequencing data was performed by FastQC (version 0.11.5) and the de novo assembly was performed by SPAdes (version 3.10.0). Genome estimated completeness and contamination were verified with CheckM (Version 1.0.18) (Parks et al., 2015). Genome annotation was conducted by the NCBI Prokaryotic Genome Annotation Pipeline (PGAP) (Tatusova et al., 2016). Additional gene prediction and functional roles were performed using RAST server with SEED database (Aziz et al., 2008) and BlastKOALA (Kanehisa et al., 2016).

The draft genome of strain HT1-32 consisted of 19 contigs with a total length of 4,423,878 bp. The sequencing depth of coverage was 147.7 X and the genomic DNA G + C content was 57.5 mol%. A total of 4,042 protein coding genes, 5 rRNA genes (3 of 5S rRNA, 1 of 16S rRNA, and 1 of 23S rRNA), 47 tRNA genes, 4 non-coding RNA and 34 pseudo genes were predicted (Table 1). The CheckM estimation for assessing the quality of genome revealed completeness at 100.0% with 1.0% contamination and no strain heterogeneity.

Genome features of strain HT1-32

Genome featuresValue
No. of contigs 19
Depth (X)147.7
Genome size (bp)4,423,878
G + C content (%)57.5
Protein-coding genes4,042
tRNA genes47
rRNA genes (5S, 16S, 23S)5 (3, 1, 1)
Non-coding RNA genes4
Pseudo genes34

The draft genome contained pathways related to carbohydrate metabolism such as glycolysis, gluconeogenesis, pyruvate oxidation, citrate cycle, pentose phosphate pathway, PRPP biosynthesis and Entner-Doudoroff pathway. The draft genome completely encoded ATP synthesis related genes such as NADH: quinone oxidoreductase, succinate dehydrogenase, fumarate reductase, cytochrome bc1 complex respiratory unit, cytochrome 981122c oxidase and F-type ATPase. The draft genome also contained sulfur-oxidizing protein SoxY/SoxZ, involved in sulfur oxidization pathway, and periplasmic nitrate reductase NapA and nitrous-oxide reductase NosZ, involved in denitrification. It also contained bacterial secretion system-related genes such as outer membrane protein TolC, hemolysin D HlyD, ATP-binding cassette HylB, preprotein translocase subunit SecA/ SecB/SecD/SecE/SecG/SecY/YajC, YidC/Oxa1 family membrane protein insertase YidC, fused signal recognition particle receptor FtsY/SRP54, and sec-independent protein translocase protein TatA/TatB/TatC. Comparison of genome sequences in the RAST server suggested that closest neighbors of strain HT1-32 are Rhodospirillum rubrum ATCC 11170 (score 517), followed by Magnetospirillum magneticum AMB-1 (score 431), Azospirillum sp. B510 (score 400), and Parvibaculum lavamentivorans DS-1 (score 386).

Nucleotide sequence accession numbers

The strain HT1-32 is available at JCM 33638. The draft genome sequence is accessible in GenBank under the accession number WJPL00000000. The version described in this paper is Version WJPL01000000.

적 요

본 연구에서 남해 연안 해수로부터 분리된 세균 HT1-32 균주의 유전체를 분석하였다. 그 결과, 유전체는 대략 4.42 Mbp의 길이 및 57.5%의 G + C 함량으로 구성되었고, 전체 4,042개의 단백질 암호 유전자, 5개의 rRNA 유전자, 47개의 tRNA 유전자, 4개의 non-coding RNA 유전자 및 34개의 위유전자(pseudo gene)가 확인되었다. 유전체 서열의 분석 과 16S rRNA 유전자 서열의 비교를 바탕으로, 균주 HT1-32는 해수에서 질소와 황의 순환에 기여할 것으로 추정되며, Rhodospirillaceae과에 속하는 새로운 종으로 추정된다.

Acknowledgements

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2017R1D1 A3B04033871).

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