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http://dx.doi.org/10.5352/JLS.2017.27.10.1145

An Efficient Method for the Release of Recombinant Penicillin G Amidase from the Escherichia coli Periplasm  

Lee, Sang-Mahn (Department of Life Science, Cheongju University)
Publication Information
Journal of Life Science / v.27, no.10, 2017 , pp. 1145-1151 More about this Journal
Abstract
In this study, we report on a simple, efficient method for obtaining penicillin G amidase (PGA) from recombinant Escherichia coli using a formulation mixed with detergent and lysozyme. Research was conducted on the extraction efficiency of PGA from the periplasmic space in cells in terms of the type of detergent, detergent concentration, pH, reaction time, and temperature of permeabilization. The extraction yield of PGA in the formulated surfactant/lysozyme treatment was increased by approximately (55-65 U/ml) in comparison with that in the single surfactant treatment. The released PGA solution was concentrated and exchanged with buffer using an ultrafiltration (U/F) system. The yields of diatomite filtration, membrane filtration (M/F), and U/F were 69.7%, 93.8%, and 77.3%, respectively. A total of 212 KU of PGA was recovered. At the 25-L culture scale, the overall yield of extraction using the mixed surfactant/lysozyme method was 49.2%. The specific activity of extracted PGA was 11 U/mg in protein. The concentrated PGA solution was immobilized on microporous silica beads without further purification of PGA. The total immobilization yield of PGA on the resin was 48.7%, while the enzyme activity was 101 U/g. The immobilized PGA was successfully used to produce 6-APA from penicillin G. Our results indicated that a simple extraction method from periplasmic space in E. coli may be used for the commercial scale production of ${\beta}-lactam$ antibiotics using immobilized PGA.
Keywords
Detergent; immobilization; lysozyme; penicillin G amidase; permeabilization;
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