한국식품영양학회지 (The Korean Journal of Food And Nutrition)
- 제6권3호
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- Pages.169-177
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- 1993
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- 1225-4339(pISSN)
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- 2287-4992(eISSN)
Escherichia coli의 Glutamine Synthetase와 Acetate Kinase에 의한 Glutamine 생산
Production of Glutamine by Glutamine Synthetase and Acetate Kinase of Escherichia coli
초록
The conversion of glutamate by glutamine synthetase Is the endergonic reaction that demands ATP as its energy source. In order to supply efficiently ATP that is demanded in the conversion of glutamate to glutamine, the ATP- generating system by acetate kinase partially purified from Escherichia coli K-12 was coupled with glutamine synthetase partially purified 5. coli K-12 Pgln6. The optinum conditions of the coupled reaction were investigated. As the result, the highest conversion of glutamate to glutamine was shown In the reaction mixture containing 100mM glutamate, 100mM NHtCl, 50M acetyl phosphate, 5mM ADP, 40M MgCl2, 300mM potassium phosphate buffer (pH 7.5), 5mM MnCl2, Under this condition, the most effective concentrations of enzyme were 70unit/ml glutamine synthetase and 99unit/ml acetate kinase. Under the optinum conditions, 98% of 100mM glutamate was converted to glutamine within 6 hours.