Ionization of a nitrophenol-containing reporter group at the active site of papain.

Acetamides Alkylation Amines Amino Acids/analysis Arginine/metabolism Benzoates/metabolism Binding Sites Bromides Catalysis Chemical Phenomena Chemistry Cysteine Dioxins Hydrogen-Ion Concentration Kinetics Mathematics Nitrophenols Papain/analysis,metabolism Protons Spectrophotometry, Ultraviolet Structure-Activity Relationship Sulfhydryl Compounds/metabolism

Acetamides Amines Amino Acids Benzoates Bromides Dioxins Nitrophenols Protons Sulfhydryl Compounds Arginine Papain Cysteine