Imitation of Phosphoenolpyruvate to Oxaloacetate Pathway Regulation of Rumen Bacteria in Enteric Escherichia coli and Effect on C4 Metabolism

반추위 미생물이 가진 Phosphoenolpyruvate에서 Oxaloacetate 경로 조절기작의 대장균에서의 모사와 C4대사의 영향

  • Kwon Yeong-Deok (Department of Life Science, The Catholic University of Korea) ;
  • Kwon Oh-Hee (Department of Biotechnology, The Catholic University of Korea) ;
  • Lee Heung-Shick (Department of Biotechnology, Korea University) ;
  • Kim Pil (Department of Biotechnology, The Catholic University of Korea)
  • 권영덕 (가톨릭대학교 생명과학과) ;
  • 권오희 (가톨릭대학교 생명공학과) ;
  • 이흥식 (고려대학교 생명정보공학과) ;
  • 김필 (가톨릭대학교 생명공학과)
  • Published : 2006.03.01


One of the fermentative metabolism of enteric Escherichia coli was imitated after rumen bacteria, which have high C4 metabolism. E. coli expresses phosphenolpyruvate carboxylase (PPC) for the pathway between phosphoenolpyruvate (PEP) and oxaloacetate (OAA) during glycolytic condition while expresses phosphoenolpyruvate carboxykinase (PCK) during gluconeogenic condition. In contrast to enteric E. coli, rumen bacteria express the PEP-OAA pathway only by PCK. To verify the effect of the regulation imitation on the C4 metabolism of E. coli, PPC-deficient E. coli strain with PCK expression in glycolytic condition was constructed. The PEP-OAA regulation modified E. coli strain increased 2.5-folds higher C4 metabolite than the wild type strain. The potential use of C4 metabolism by regulation control is discussed.


Phosphoenolpyruvate (PEP);oxaloacetate (OAA);phosphoenolpyruvate carboxykinase (PCK);phosphoenolpyruvate carboxylase (PPC);Escherichia coli physiology;regulation


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