Effect of culture conditions on synthesis of L-asparaginase by Escherichia coli A-1.
The nutritional requirements and culture conditions affecting biosynthesis of L-asparaginase in a mutant of Escherichia coli HAP designated strain A-1 were studied. Asparaginase activity was increased by the addition of L-glutamic acid, L-glutamine, or commercial-grade monosodium glutamate. The rate of enzyme synthesis was dependent on the interaction between the pH of the culture and the amount of oxygen dissolved in the medium. A critical oxygen transfer rate essential for asparaginase formation was identified, and a fermentation procedure is described in which enzyme synthesis is controlled by aeration rate. Enhancement of L-asparaginase activity by monosodium glutamate was inhibited by the presence of glucose, culture pH, chloramphenicol, and oxygen dissolved in the fermentation medium.[1]References
- Effect of culture conditions on synthesis of L-asparaginase by Escherichia coli A-1. Barnes, W.R., Dorn, G.L., Vela, G.R. Appl. Environ. Microbiol. (1977) [Pubmed]
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