Fluorometric assay for alcohol sulfotransferase

Wei Ti Chen, Ming Chih Liu, Yuh-Shyong Yang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


A sensitive fluorometric assay was developed for alcohol sulfotransferase (AST). This was the first continuous fluorometric assay reported for AST. It used 3′-phosphoadenosine 5′-phosphosulfate regenerated from 3-phosphoadenosine 5′-phosphate by a recombinant phenol sulfotransferase (PST) using 4-methylumbelliferyl sulfate as the sulfuryl group donor. The recombinant PST did not use the alcohol substrate under the designed condition, and the sensitivity for AST activity was found to be comparable to that of radioactive assay as reported in the literature. The change of fluorescence intensity of 4-methylumbelliferone corresponded directly to the amount of active AST and was sensitive enough to measure nanogram or picomole amounts of the enzyme activity. This fluorometric assay was used to determine the activities of AST as purified form and in crude extracts of pig liver, rat liver, and Escherichia coli. Some properties of human dehydroepiandrosterone sulfotransferase were determined by this method and were found to be comparable to published data. Under similar assay conditions, the contaminated activities of arylsulfatase in crude extracts were also determined. This method not only is useful for the routine and detailed kinetic study of this important class of enzymes but also has the potential for the development of a high-throughput procedure using microplate reader.

Original languageEnglish
Pages (from-to)54-60
Number of pages7
JournalAnalytical Biochemistry
Issue number1
StatePublished - 1 Apr 2005


  • Alcohol sulfotransferase
  • PAP
  • PAPS
  • Phenol sulfotransferase

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