Abstract
Lysozyme from bacteriophage T4 was found to digest a soluble, uncrosslinked peptidoglycan which is secreted by cells of Micrococcus luteus when incubated in the presence of penicillin G. Analysis of the enzymatic degradation products shows that T4 acts as an endo-acetylmuramidase capable of cleaving glycosidic bonds only at muramic acid residues that are substituted with peptide side-chains. The results indicate that the secreted peptidoglycan may consist of a mixture of chains, approximately half of which are substituted by peptide side chains on most of their muramic acid residues, while the other half is made up of chains in which the muramic acid moieties are unsubstituted.
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