title: Reaction of chicken egg white lysozyme with 7-chloro-4-nitrobenz-2-oxa-1,3-diazole. II. Sites of modification.
abstract: 1. Procedure for the isolation of peptides from proteins bearing the chemically labile aromatic ether, O-tyrosyl-4-nitrobenz-2-oxa-1,3-diazole group, is described. 2. The tyrosyl residue reactive towards 7-chloro-4-nitrobenz-2-oxa-1,3-diazole in chicken egg white lysozyme (Aboderin, A. A., Boedefeld, E. and Luisi, P. L., (1973) Biochim. Biophys. Acta 328. 20-30) is tyrosine-23. The amino group in the protein whose reaction with the reagent is dependent on the prior reaction of tyrosine-23 is the epsilon-amino group of lysine-33.
mesh_terms: D009327:4-Chloro-7-nitrobenzofurazan; D000595:Amino Acid Sequence; D000596:Amino Acids / Q000032:analysis; D001665:Binding Sites; D004529:Egg White; D007700:Kinetics; D009113:Muramidase / Q000032:analysis; D010069:Oxadiazoles; D011485:Protein Binding; D011487:Protein Conformation; D013053:Spectrophotometry; D013056:Spectrophotometry, Ultraviolet
chemical_list: D000596:Amino Acids; D010069:Oxadiazoles; D009113:Muramidase; D009327:4-Chloro-7-nitrobenzofurazan