title: Evidence for essential histidine residues in tryptophanyl-tRNA synthetase.
mesh_terms: D000604:Amino Acyl-tRNA Synthetases / Q000378:metabolism; D000818:Animals; D001665:Binding Sites; D002417:Cattle; D002942:Circular Dichroism; D004047:Diethyl Pyrocarbonate / Q000494:pharmacology; D006639:Histidine; D007700:Kinetics; D010179:Pancreas / Q000201:enzymology; D012343:RNA, Transfer; D013056:Spectrophotometry, Ultraviolet; D014369:Tryptophan-tRNA Ligase / Q000378:metabolism
chemical_list: D006639:Histidine; D012343:RNA, Transfer; D000604:Amino Acyl-tRNA Synthetases; D014369:Tryptophan-tRNA Ligase; D004047:Diethyl Pyrocarbonate