Spectrofluorimetric assays for rat liver phenol sulphotransferases I/II and III/IV based on a common substrate |
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Authors: | Akira Sano Ikko Nakao Shoji Takitani |
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Institution: | Faculty of Pharmaceutical Sciences, Science University of Tokyo, 12 Ichigaya-funagawara-machi, Shinjuku-ku, Tokyo 162 Japan |
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Abstract: | A spectrofluorimetric method for the separate assay of two subgroups of rat liver phenol sulphotransferases (PSTs I and II and PSTs III and IV) has been established. The method is based on the enzyme reaction using two different concentrations of p-hydroxybenzaldehyde (10 μM for PSTs III/IV and 3 mM for PSTs I/II) as the substrate and the spectrofluorimetric determination of the product p-formylphenyl sulphate by means of its reaction with 1,4-dimethyl-3-carbamoylpyridinium chloride, a selective reagent for aromatic aldehydes without free phenolic hydroxy groups. The detection limit of the sulphate is 50–70 pmol in the enzyme reaction mixutre. The Km values for p-hydroxybenzaldehyde with PSTs I/II and III/IV were 1.1 mM and 2.1 μM, respectively. The effects of growth and of dexamethasone treatment of rats on the liver PST activities were also studied. |
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Keywords: | Enzyme reaction Phenol sulphotransferase |
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