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J Bacteriol. 1968 June; 95(6): 2117-2123
Copyright © 1968 American Society for Microbiology. All Rights Reserved.

New Procedures for Purification of L-Asparaginase with High Yield from Escherichia coli

^a Wadley Institutes of Molecular Medicine, Dallas, Texas 75235

ABSTRACT

L-Asparaginase is now known to be a potent antineoplastic agent in animals and has given complete remission in some human leukemias. Extensive clinical trials of this enzyme, however, were not possible in the past because of inadequate production of this substance. We have developed practical procedures for producing L-asparaginase in yields of sufficient quantity and purity for more extensive clinical evaluation. The nutritional requirements for optimal production of biologically active L-asparaginase by a strain of Escherichia coli have been ascertained. The highest yields of enzyme were obtained when cells were grown aerobically in a corn steep medium. Good enzyme production was associated with media containing L-glutamic acid, L-methionine, and lactic acid. The addition of glucose to the medium, however, resulted in depressed production of L-asparaginase. Sodium ion appeared to suppress L-asparaginase production. With the procedure described for isolation of biologically active L-asparaginase from E. coli, stable L-asparaginase preparations with a specific activity of 620 IU per mg of protein (1,240-fold purification with 40% total recovery) were obtained.

¹ Scholar of the Leukemia Society of America.

This article has been cited by other articles:

• Ho, P. P. K., Frank, B. H., Burck, P. J. (1969). Crystalline L-Asparaginase from Escherichia coli B. Science 165: 510-512 [Abstract]