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The common dietary constituent quercetin was a potent inhibitor of sulfoconjugation of acetaminophen and minoxidil by human liver cytosol, partially purified P-form phenolsulfotransferase (PST), and recombinant P-form PST, with IC50 values of 0.025-0.095 microM. Quercetin inhibition of acetaminophen was noncompetitive with respect to acceptor substrate,… (More)
1. The metabolism of (+)-, (-)- and (+/-)-salbutamol by sulphoconjugation was determined in vitro using human lung cytosol and bronchial epithelial BEAS-2B cell homogenate. 2. For the lungs the intrinsic clearance (Vmax/Km) value for the pharmacologically active (-)-salbutamol (0.49 +/- 0.32 ml min-1 g-1 protein) exceeded that of (+)-salbutamol (0.046 +/-… (More)
Bacterial expression of human phenol phenolsulfotransferase (P-PST) has provided the opportunity to understand better the catalytic properties and biological role of this enzyme. However, as the yield of pure protein from the currently used expression system was low, we subcloned the P-PST c-DNA into pET-15b, a vector containing an oligohistidine domain,… (More)
The natural product quercetin was a potent inhibitor of the human P-form phenolsulfo-transferase with an IC50 value of 0.10 +/- 0.03 microM (mean +/- SEM; N = 5), which was three to four orders of magnitude more potent than its inhibition of other human sulfotransferases. The inhibition was noncompetitive with a Ki value of 0.10 microM. The potency and… (More)
I read with interest Thomas Byrne's article: "An Extension of Pascal's Triangle and Work concerning Binomial Expansion Coefficients" in the February 1990 issue. On page 28 Mr. Byrne states: "I was seeking a mechanism to generate multinomial expansion coefficients but this doesn't do it . . . Maybe a three dimensional extension will prove useful."