Department of Food and Nutrition, Dongduk Women's University, Seoul 02748, Republic of Korea.
R&BD Center, Korea Yakult Co., Ltd., Yongin 17086, Republic of Korea.
J Microbiol Biotechnol. 2021 Feb 28;31(2):298-303. doi: 10.4014/jmb.2011.11022.
Comparative genomic analysis was performed on eight species of lactic acid bacteria (LAB)- (.) (.) , (.) , and -to assess their glutamic acid production pathways. Glutamic acid is important for umami taste in foods. The only genes for glutamic acid production identified in the eight LAB were for conversion from glutamine in and , and from glucose via citrate in . Thus, was considered to be potentially the best of the species for glutamic acid production. By biochemical analyses, HY7803 was selected for glutamic acid production from among 17 strains. Strain HY7803 produced 83.16 pmol/μl glutamic acid from glucose, and exogenous supplementation of citrate increased this to 108.42 pmol/μl. Including glutamic acid, strain HY7803 produced more of 10 free amino acids than reference strains IL1403 and ATCC 7962 in the presence of exogenous citrate. The differences in the amino acid profiles of the strains were illuminated by principal component analysis. Our results indicate that HY7803 may be a good starter strain for glutamic acid production.
对 8 种乳酸菌(LAB)——(。)(。)、(。)、(。)和——进行了比较基因组分析,以评估它们的谷氨酸生产途径。谷氨酸在食品中具有鲜味。在这 8 种 LAB 中鉴定出的唯一用于生产谷氨酸的基因是来自谷氨酰胺的 和 ,以及来自葡萄糖的柠檬酸 。因此,被认为是最有潜力生产谷氨酸的物种。通过生化分析,从 17 株菌中选择了 HY7803 用于从葡萄糖生产谷氨酸。菌株 HY7803 从葡萄糖中产生 83.16 pmol/μl 的谷氨酸,外源性补充柠檬酸将其增加到 108.42 pmol/μl。包括谷氨酸在内,菌株 HY7803 在添加外源柠檬酸时比参考菌株 IL1403 和 ATCC 7962 产生更多的 10 种游离氨基酸。主成分分析揭示了菌株氨基酸图谱的差异。我们的结果表明,HY7803 可能是一种生产谷氨酸的良好起始菌株。