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Draft genome sequence of Lactiplantibacillus plantarum GD00040 isolated from Korean cucumber kimchi
Korean J. Microbiol. 2021;57(3):213-215
Published online September 30, 2021
© 2021 The Microbiological Society of Korea.

Seojin Choi1 and Eun Bae Kim1,2*

1Department of Applied Animal Science, College of Animal Life Sciences, Kangwon National University, Chuncheon 24341, Republic of Korea
2Institute of Animal Life Science, Kangwon National University, Chuncheon 24341, Republic of Korea
Correspondence to: E-mail: itanimal@kangwon.ac.kr; Tel.: +82-33-250-8642; Fax: +82-33-259-5574
Received June 4, 2021; Revised August 9, 2021; Accepted August 17, 2021.
Abstract
Lactiplantibacillus plantarum is a beneficial probiotic for humans and commonly used as a feed additive for animals. We sequenced the genome of Lpb. plantarum GD00040 isolated from Korean cucumber kimchi using the MGIseq system. The total length of the draft genome was 3,392,132 bp, and its G + C content was 44.2% in 122 contigs (length ≥ 500 bp). Lactiplantibacillus plantarum contained a plasmid of length 3,962 bp, with G + C content of 35.9%.
Keywords : Lactiplantibacillus plantarum, genome sequencing, hybrid assembly, probiotics
Body

Lactiplantibacillus spp. are Gram-positive aerotolerant anaerobic bacteria (Zheng et al., 2020). They are used as feed additives in the livestock industry (Jeong et al., 2017). Lactiplantibacillus plantarum is generally found in numerous fermented vegetable foods, especially fermented kimchi (Garcia-Gonzalez et al., 2021). Previously, there is no Lpb. plantarum strains have been isolated from cucumber kimchi. Here, we isolated Lpb. plantarum GD00040 from Korean cucumber kimchi. A single colony of Lpb. plantarum GD00040 that was cultured on de Man, Rogosa, and Sharpe agar (MRS, MB cell) was inoculated into the MRS broth and incubated at 37°C for 24 h. Cells were recovered by centrifugation at 13,000 × g for 1 min. The genomic DNA (gDNA) was extracted using the G-spinTM For Bacteria Genomic DNA Extraction Kit (iNtRON Biotechnology) and subjected to 16S ribosomal RNA sequencing using the 27F and 1492R primer sets (Weisburg et al., 1991) and identified using NCBI BLAST. A DNA library was prepared using the MGIEasy DNA Library Kit (MGI) according to the manufacturer’s instructions.

The fragmented gDNA size-selected by AMPure XP magnetic beads were end-repaired and a-tailed at 37°C for 30 min followed by 65°C for 15 min. The ends of the DNA fragments were ligated to the indexing adapter at 23°C for 60 min. After organizing the adapter-ligated DNA, PCR was performed to enrich the DNA fragments with adapter molecules. The thermocycling conditions were as follows: 95°C for 3 min; seven cycles of 98°C for 20 sec, 60°C for 15 sec, and 72°C for 30 sec; and a final extension at 72°C for 10 min. The double-stranded DNA library was quantified using the QauntiFluor ONE dsDNA System (Promega). After construction of the library, the circularized product was purified at 37°C for 30 min and digested at 37°C for 30 min. To obtain a DNA nanoball (DNB), the library was incubated at 30°C for 25 min using DNB enzyme. Finally, the library was quantified using the QuantiFluor ssDNA System (Promega). Sequencing of the prepared DNB was performed using the MGIseq system (MGI) with 150 bp paired-end reads. After sequencing, the adapted sequences were detached using an in-house Perl script code. Before assembly, the sequences were filtered according to the following conditions: accuracy > 95%, cut-off < 64 bp and over 95 bp. In addition, paired-end reads were randomly selected to lower sequence depth using seqtk (number of reads: 16,934,989; sequence depth: 776× changed from number of reads: 3,390,000: sequence depth: 96×). Filtered paired-end reads were assembled de novo using SPAdes (version 3.15.1). Finally, the genome size of Lpb. plantarum GD00040 was determined to be 3,392,132 bp, which was assembled with 122 contigs (contig length ≥ 500 bp; G + C content, 44.2%) and a circular plasmid of size 3,962 bp (G + C content, 35.9%) (Table 1). A total of 3,199 coding sequences and 62 RNA genes were predicted using the Rapid Annotation Using Subsystems Technology web server (Aziz et al., 2008). Genes encoding bacteriocins (plantaricin J and pediocin) were predicted using the web server BAGEL4 (de Jong et al., 2006). Pediocin is an active peptide with a highly specific inhibitory activity against Listeria monocytogenes (Espitia et al., 2016). In addition, plantaricin J (encoded by plnJ) inhibits the growth of Escherichia coli (Pal and Srivastava, 2014). Further studies are needed to elucidate the antibacterial effects of these genes. No known antibiotic resistance genes were identified in the draft genome following analysis using the Comprehensive Antibiotic Resistance Database (McArthur et al., 2013). According to annotation results, there is a gene to product L-arabinose isomerase. L-Arabinose is a sugar in plant-specific. This isomerase catalyses the conversion of L-arabinose to L-ribulose (Kotake et al., 2016). The draft genome sequence of Lpb. plantarum GD00040 (KCCM 43412) will enable a better understanding of Lpb. plantarum strains isolated from fermented kimchi.

Overview for Lpb. plantarum GD00040 (KCCM 43412) and plasmid

Features Chromosome Plasmid
Genome size (bp) 3,392,132 3,962
No. of contigs (≥ 500 bp) 122 1
GC content (%) 44.2 35.9
No. of RNA genes 62 0
No. of protein-coding genes 3,199 6


Nucleotide sequence accession numbers

The draft genome sequence of Lpb. plantarum GD00040 (KCCM 43412) has been deposited in GenBank under accession number JAGJWY000000000. The Lpb. plantarum GD00040 (KCCM 43412) strain has been deposited in the Korea Culture Center of Microorganisms, Seoul, Korea under accession number KCCM 43412.

적 요

이 연구에서 사용한 Lactiplantibacillus plantarum GD00040 (KCCM 43412) 균주는 한국 전통 발효식품인 오이김치에서 분리되었다. 우리는 이 균주에 대하여 WGS를 진행하였다. 유전체 초안의 크기는 3,392,132 bp, G + C 함량(%)는 44.2%이고 500 bp 이상의 contig 122개로 조립되었다. 그리고 원형의 플라스미드 3,962 bp, G + C 함량(%)이 35.9%가 발견되었다. 유전체 초안에서 항균활성물질(Bacteriocin)인 Plantaricin과 Pediocin 유전자가 확인되었다. 또한 알려진 항생제 저항성 유전자는 발견되지 않았다.

Acknowledgments

This study was supported by the National Research Foundation of Korea (NRF-2019R1A2C1009406) and 2018 Research Grant (PoINT) from Kangwon National University.

Conflict of Interest

The authors have no conflict of interest to report.

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