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- W2133923024 endingPage "438" @default.
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- W2133923024 abstract "Penicillin amidases (PAs) from E. coli and A. faecalisare periplasmic enzymes that contain one tightly bound Ca2+ per molecule that does not directly participate in the enzymatic function. This ion may, however, be required for the maturation of the pre-pro-enzyme. The pro-enzyme of homologous PAs are translocated through the Tat-(E. coli PAEC) and Sec- (A. faecalis PAAF) transport systems, respectively. Cell fractionation, electrophoresis, immunoblotting, and activity staining demonstrated that Ca2+ binding is required for the membrane transport and maturation of the pro-enzyme to active enzyme. Pro-enzyme without Ca2+ was targeted to the membrane but not translocated. Influence of Ca2+ in medium and feed was studied for high cell density cultivations of E. coli expressing these enzymes. Without Ca2+ in the feed the synthesis of the pre-pro-enzyme was hardly influenced. At optimal Ca2+ content in the feed the active enzyme amount could be increased by 2 orders of magnitude up to 0.9 g/L (PAEC) and 2.3 g/L (PAAF) or 4% (PAEC) and 8% (PAAF) of the cell dry weight. The corresponding specific activities are 1700 U (PAEC) and 14000 U (PAAF) per gram cell dry weight, respectively. These values are higher than those published previously. Thus, for optimal yields of the studied and other extra- and periplasmic enzymes that require Ca2+ or other ions as cofactors for membrane transport and maturation, sufficient cofactor must be added in the feed." @default.
- W2133923024 created "2016-06-24" @default.
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- W2133923024 date "2008-09-05" @default.
- W2133923024 modified "2023-10-18" @default.
- W2133923024 title "Ca2+ Is a Cofactor Required for Membrane Transport and Maturation and Is a Yield-Determining Factor in High Cell Density Penicillin Amidase Production" @default.
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- W2133923024 doi "https://doi.org/10.1021/bp049636a" @default.
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