title: The amino acid sequence of the fluorescein isothiocyanate reactive site of lamb and rat kidney Na+- and K+-dependent ATPase.
abstract: Fluorescein 5'-isothiocyanate has been used to label ouabain sensitive and insensitive (Na,K)-ATPases from lamb and rat kidney, respectively. The labeled enzymes were digested with trypsin to generate soluble peptides, which were purified by high performance liquid chromatography and sequenced on a gas phase sequenator. The sequence of the labeled peptide from both species is His-Leu-Leu-Val-Met-Lys-Gly-Ala-Pro-Glu-Arg. Thus, it appears that the primary structure of the fluorescein 5'-isothiocyanate reactive site, and therefore presumably the ATP binding site, is completely conserved in ouabain sensitive and ouabain insensitive (Na,K)-ATPases.
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001665:Binding Sites; D002849:Chromatography, Gas; D016650:Fluorescein-5-isothiocyanate; D005452:Fluoresceins / Q000494:pharmacology*; D005456:Fluorescent Dyes / Q000494:pharmacology*; D007668:Kidney / Q000201:enzymology*; D010042:Ouabain / Q000494:pharmacology; D010446:Peptide Fragments / Q000032:analysis; D051381:Rats; D012756:Sheep; D000254:Sodium-Potassium-Exchanging ATPase / Q000378:metabolism*; D013045:Species Specificity; D013861:Thiocyanates / Q000494:pharmacology*; D014357:Trypsin
chemical_list: D005452:Fluoresceins; D005456:Fluorescent Dyes; D010446:Peptide Fragments; D013861:Thiocyanates; D010042:Ouabain; D014357:Trypsin; D000254:Sodium-Potassium-Exchanging ATPase; D016650:Fluorescein-5-isothiocyanate