Two lactic acid bacteria (LAB) with high r-aminobutyric acid (GABA)-producing capacity were isolated from naturally aged cheese. Examination of the biochemical features using an API kit indicated that the two strains belonged to Lactobacillus. They were gram positive, rod-type bacteria, and fermented arabinose, melezitose, melibiose and xylose, but did not utilize cellobiose or trehalose. 16S rDNA sequencing analysis confirmed that they were Lactobacillus buchneri and Lactobacillus sp. They were accordingly named as Lactobacillus buchneri OPM-1 and Lactobacillus sp. OPM-2, and could produce GABA from MRS broth supplemented with 10 g/L of monosodium glutamate (MSG) at a productivity of 91.7 and 116.7 mg/L/hr, respectively. Cell extracts of L. buchneri OPM-1 and Lactobacillus sp. OPM-2 showed glutamate decarboxylase (GAD) activity, for which the optimum pH and temperature were 5.5 and 30℃, respectively.
목차
Abstract Introduction Materials and Methods Results and Discussion Acknowledgments References
키워드
cheeser-aminobutyric acid (GABA)Lactobacillus species
저자
Park, Ki-Bum [ Department of Life Science and Technology, Graduate School, Woosuk University ]
Oh, Suk-Heung [ Department of Medicinal Biotechnology, Woosuk University ]
Corresponding author