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Effects of C/N ratio on the growth and lactate production in lactic acid bacteria
Kiyeop Kim,Dingyun Lee,Sejong Oh 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10
The MRS medium commonly used for cell production of lactobacilli which MRS medium has a CN ratio of 4/1. Because of MRS medium is an expensive, luxuriant medium with complicated components, it is not suitable for large-scale production of probiotics. The purpose of this study was to figure out the effect of carbon-nitrogen (C/N) ratios (4:1 and 10:1) culture medium (simplified-medium) on the growth and lactate production by the seven strains of lactic acid bacteria (LAB). The viable cells of tested-LAB were influence by the type of the carbon source (maltose and glucose), the nitrogen source (yeast extract and peptone), and the C/N ratios (4:1 and 10:1) in the medium. When maltose was used as a sole carbon source, tested LAB grew slowly. There was no difference in viable cells in the C/N ratios of simplified medium. However, when glucose was used as carbon source, tested LAB except L. delbruekii subsp bulgaricus showed higher growth in C/N (10:1) simplified-medium. D/L lactate production was affected by the growth of LAB, but there was no difference according to C/N ratios (4:1 and 10:1).
Complete genome sequences of Lactococcus lactis JNU 534, a potential food and feed preservative
류상돈,Kiyeop Kim,Dae-Yeon Cho,Young Hoon Kim,Sejong OH 한국축산학회 2022 한국축산학회지 Vol.64 No.3
A new bacteriocin-producing lactic acid bacteria isolated from kimchi was identified as Lactococcus lactis JNU 534, presenting preservative properties for foods of animal origin. In this study, we present the complete genome sequence of the bacterial strain JNU 534. The final complete genome assembly consists of one circular chromosome (2,443,687 bp [base pair]) with an overall GC (guanine-cytosine) content of 35.2%, one circular plasmid sequence (46,387 bp) with a GC content of 34.5%, and one circular contig sequence (7,666 bp) with a GC content of 36.2%.
김보근,Kiyeop Kim,Xiaoyue Xu,Hyunju Lee,Duleepa Pathiraja,Dong June Park,최인걸,오세종 한국축산학회 2023 한국축산학회지 Vol.65 No.6
In this study, we report the complete genome sequence of Lactiplantibacillus plantarum L55, a probiotic strain of lactic acid bacteria isolated from kimchi. The genome consists of one circular chromosome (2,077,416 base pair [bp]) with a guanine cytosine (GC) content of 44.5%, and two circular plasmid sequences (54,267 and 19,592 bp, respectively). We also conducted a comprehensive analysis of the genome, which identified the presence of functional genes, genomic islands, and antibiotic-resistance genes. The genome sequence data presented in this study provide insights into the genetic basis of L. plantarum L55, which could be beneficial for the future development of probiotic applications.
( Xing Wang ),( Dingyun Li ),( Ziyao Meng ),( Kiyeop Kim ),( Sejong Oh ) 한국미생물 · 생명공학회 2022 Journal of microbiology and biotechnology Vol.32 No.3
Recent studies have shown that probiotics have health-promoting effects, particularly intestinal immune modulation. In this study, we focused on the immunomodulatory properties of Latilactobacillus curvatus BYB3, formerly called Lactobacillus curvatus, isolated from kimchi. In a mouse model of 14-day dextran sulfate sodium (DSS)-induced colitis, treatment with L. curvatus BYB3 significantly decreased the disease activity index, colon length, and weight loss. Moreover, histological analyses showed that L. curvatus BYB3 protected the structural integrity of the intestinal epithelial layer and mucin-secreting goblet cells from DSS-induced damage, with only slight infiltration by immune cells. To evaluate the molecular mechanisms underlying L. curvatus BYB3-driven inhibition of interleukin 6 production, possible in vivo anti-inflammatory effects of L. curvatus BYB3 were examined in the same mouse model. In addition, significantly lower levels of IL-6 and tumor necrosis factor receptor 1 upregulation were seen in the DSS+BYB3 group (compared to that in the DSS group). These results indicate that L. curvatus BYB3 exhibits health-promoting effects via immune modulation; and therefore, it can be used to treat various inflammatory diseases.