title: Penicillinase active sites: labelling of serine-44 in beta-lactamase I by 6beta-bromopenicillanic acid.
mesh_terms: D000345:Affinity Labels; D001665:Binding Sites; D010397:Penicillanic Acid / Q000378:metabolism*; D010405:Penicillinase / Q000378:metabolism*; D010446:Peptide Fragments / Q000032:analysis; D012694:Serine; D013056:Spectrophotometry, Ultraviolet; D001618:beta-Lactamases / Q000378:metabolism*
chemical_list: D000345:Affinity Labels; D010446:Peptide Fragments; D012694:Serine; D010397:Penicillanic Acid; D010405:Penicillinase; D001618:beta-Lactamases