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Endo-beta-N-acetylglucosaminidase F preparations from Flavobacterium meningosepticum have been found to contain peptide:N-glycosidase activity. Only the second activity, designated as peptide:N-glycosidase F, readily cleaves the beta-aspartylglycosylamine linkage of a fetuin triantennary complex glycopeptide, as shown by the isolation of the corresponding carbohydrate-free peptide containing aspartic acid and of an intact oligosaccharide with a di-N-acetylchitobiosyl moiety at the reducing end. Both activities in the mixture will hydrolyze a high mannose octaglycopeptide from ovalbumin, with the type of product formed being influenced by pH. At pH 4.0, only the endo-beta-N-acetylglucosaminidase F activity is functional, releasing octapeptide-GlcNAc and oligosaccharide-GlcNAc. At pH 9.3, the predominant cleavage is by peptide:N-glycosidase F at the glycosylamine bond, releasing octapeptide and oligosaccharide-GlcNAc-GlcNAc. This latter oligosaccharide is then hydrolyzed by endo-beta-N-acetylglucosaminidase F to oligosaccharide-GlcNAc plus GlcNAc.
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