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GABA (γ-aminobutyric acid) Bioconversion by Genetically Engineered Escherichia coli

첫 페이지 보기
  • 발행기관
    한국생물공학회 바로가기
  • 간행물
    한국생물공학회 학술대회 바로가기
  • 통권
    2011년도 한국생물공학회 춘계학술발표대회 (2011.04)바로가기
  • 페이지
    pp.194-194
  • 저자
    Jiseun KO, Le Tam VO DINH, Soon Ho HONG
  • 언어
    영어(ENG)
  • URL
    https://www.earticle.net/Article/A144717

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원문정보

초록

영어
Gamma-aminobutyric acid (GABA), a non-essential amino acid, is formed by decarboxylation of L-glutamate with the catalysis of glutamate decarboxylase (GAD, EC 4.1.1.15), a pyridoxal 5′-phosphate (PLP) dependent enzyme. In Escherichia coli, glutamate decarboxylase (GadB), together with GadC, a putative glutamate/GABA antiporter located downstream of gadB and cotranscribed with gadB, constitutes the gad acid resistance system, which controls the acidification of the cytosolic environment by decarboxylating an acidic substrate (glutamate) into a neutral compound (GABA) which would then be exported into the extracellular medium through the GadC. GadB has another isoform (GadA), which is 2100 kb away from GadB in the E.coli chromosome. In this study, GadA, GadB (52.7 kDa), GadC (55 kDa) were overexpressed in XL1-Blue by constructing four expression vectors containing GadA, GadB, GadA and GadC (GadA-GadC), GadB and GadC (GadB-GadC) respectively. In glutamate metabolic pathway of Escherichia coli, there is a gene called gabT coding for γ-aminobutyrate aminotransferase (2.6.1.19) which converts GABA into succinate semialdehyde and then reduces GABA concentration in the extracellular medium. Hence, this gene was knockouted to enhance GABA bioconversion efficiency in this work. The results show GABA concentrations in the extracellular medium containing MSG (monosodium glutamate) in cases of overexpression of GadA and GadC (GadA-GadC), GadB and GadC (GadB-GadC) are higher than the concentrations in cases of overexpression of only GadA and GadB respectively (about 84% GABA bioconversion rate after 48 hours under controlled conditions for GadA-GadC overexpression compared to 54% for GadA overexpression). Likewise, GABA concentrations in cases of mutated XL1-Blues are higher than the concentrations in the wild type (about 77% GABA bioconversion rate for GadA overexpression in mutated strain compared to 54% in the same overexpression manner in the wild type XL1-Blue). Therefore, by overexpression of GadA, GadB, GadC, and making mutated strains, the wild type XB1-Blues have been genetically engineered to perform conversion with high GABA levels in the extracellular medium from glutamate.

키워드

GABA bioconversion Gad system Engineered E. coli Gamma amino butyric acid production

저자

  • Jiseun KO [ School of Chemical Engineering &Bioengineering, University of Ulsan, Ulsan, 680-749. ]
  • Le Tam VO DINH [ School of Chemical Engineering &Bioengineering, University of Ulsan, Ulsan, 680-749. ]
  • Soon Ho HONG [ School of Chemical Engineering &Bioengineering, University of Ulsan, Ulsan, 680-749. ]

참고문헌

자료제공 : 네이버학술정보

간행물 정보

발행기관

  • 발행기관명
    한국생물공학회 [The Korean Society for Biotechnology and Bioengineering]
  • 설립연도
    1984
  • 분야
    공학>생물공학
  • 소개
    이 법인은 생물 공학의 발전과 보급에 이바지하고, 회원 상호 간의 연구 협력과 친목을 도모함을 목적으로 한다 1. 생물공학 분야의 발전을 위한 연구 협력 2. 생물공학의 실용화를 촉진시키기 위한 산학 협동 3. 학술연구 발표회, 강연회, 연수회 등 학술활동의 개최 4. 국,영문 학술지,소식지,학술회의 Proceedings 및 학술도서의 발간 5. 생물공학 발전을 위한 정책 건의 6. 기타 국제 교류 등 본 학회의 목적 달성을 위한 제반 활동

간행물

  • 간행물명
    한국생물공학회 학술대회
  • 간기
    반년간
  • 수록기간
    1985~2013
  • 십진분류
    KDC 476 DDC 576

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