J. Biochem, 1978, Vol. 83, No. 3 893-903
© 1978 Japanese Biochemical Society
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Purification and Characterization of Lysozyme Produced by Streptomyces erythraeus
Department of Chemistry, College of Science, Osaka University Toyonaka, Osaka 560
A species of lysozyme (SE lysozyme) was purified from culture filtrate of Streptomyces erythraeus. The enzyme has a molecular weight of 18,500 as determined by ultracentrifugation. Its isoelectric point is 9.5, and it shows optimal activity at pH 4.0 with an optimal ionic strength of 0.1. Investigation of the substrate specificity showed SE lysozyme to be an N-acetyl-muramidase. The simplest product in the digest of cell walls of Micrococcus lysodeikticus was identified as a disaccharide, [GlcNAcß(1
4)MurNAc]. While S. aureus as well as M. lysodeikticus was lysed by this lysozyme, chitin and its derivatives were not.
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