ultraviolet difference spectroscopy of the binary complex of isozyme 4-4 of rat liver glutathione s-transferase with glutathione ( gsh ) and the enzyme alone or as the binary complex with the oxygen analogue , gamma-l-glutamyl-l-serylglycine ( goh ) , at neutral ph reveals an absorption band at 239 nm ( epsilon = 5200 m-1 cm-1 ) that is assigned to the thiolate anion ( gs- ) of the bound tripeptide .
C0022173
isozyme
C0014442
enzyme