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논문 상세정보

전통발효식품 유래 Enterococcus faecium JK29에 의한 γ-aminobutyric acid의 생산 최적화

Optimization of γ-Aminobutyric Acid Production by Enterococcus faecium JK29 Isolated from a Traditional Fermented Foods

초록

${\gamma}$-Aminobutyric acid(GABA)를 생산하는 희귀 젖산균을 분리하기 위하여 전통발효식품으로부터 총 147개의 젖산균을 확보한 후 1% 글루탐산 나트륨(L-monosodium glutamate, MSG)를 사용하여 GABA를 생산하는 23개의 균주를 1차 분리하였다. 2차 분리를 위하여 글루탐산 탈탄산효소(glutamate decarboxylase)와 16S rRNA 유전자의 염기서열 분석을 통해 기본 MRS 배지에서 48시간 배양 후 1.56 mM의 GABA를 생산하는 Enterococcus faecium JK29를 최종 분리하였다. E. faecium JK29에 의한 GABA의 생산을 향상시키기 위하여 배양 조건을 최적화하였으며 그 결과 0.5% 자당(sucrose), 2% 효모 추출물(yeast extract), 0.5% 글루탐산 나트륨이 포함된 최적화 MRS 배지를 개발하였다. 최적화 MRS 배지를 활용하여 $30^{\circ}C$, pH 7.5에서 48시간 배양을 한 결과 E. faecium JK29이 14.86 mM의 GABA를 생산하는 것을 확인하였다.

Abstract

Dominant lactic acid bacteria (LAB) strains were isolated from traditional fermented foods to obtain rare ${\gamma}$-aminobutyric acid (GABA)-producing LAB. Out of 147 isolates, 23 strains that could produce GABA with 1% (w/v) L-monosodium glutamate (MSG) were first isolated. After further screening of these rare GABA-producing LAB by analysis of the glutamate decarboxylase and 16S rRNA gene sequences, Enterococcus faecium JK29 was isolated, and 1.56 mM of GABA was produced after 48 h cultivation in basic de Man, Rogosa, and Sharpe (MRS) medium. To enhance GABA production by E. faecium JK29, the culture conditions were optimized. When E. faecium JK29 was cultivated in optimized MRS medium containing 0.5% (w/v) sucrose and 2% (w/v) yeast extract with 0.5% (w/v) MSG, GABA production reached 14.86 mM after 48 h cultivation at initial conditions of pH 7.5 and $30^{\circ}C$.

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