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- W2069969143 abstract "The role of hepatic cytosolic aryl sulfotransferase (3'-phosphoadenylylsulfate:phenol sulfotransferase, EC 2.8.2.1) in the enzymic rearrangement of 9-fluorenone oxime to phenanthridone was investigated. 9-Fluorenone oxime was found to be an excellent substrate for a partially purified rat liver aryl sulfotransferase preparation. This compound was in fact superior to 2-naphthol, the standard assay substrate. This is the first reported observation of aryl oxime sulfation by the aryl sulfotransferases. 9-Fluorenone oxime sulfation exhibited pronounced substrate inhibition at high substrate concentrations. However, despite virtually complete conversion of 9-fluorenone oxime to the corresponding N-O-sulfate conjugate in enzyme incubation mixtures, only small amounts of rearrangement product were detected after long-term incubations. In addition, 9-fluorenone oxime-O-sulfonic acid was chemically synthesized and tested for stability. The results showed that rearrangement was pH-dependent and occurred slowly over several hours. It is therefore concluded that aryl sulfotransferase-catalyzed sulfation likely plays an important role in the in vitro and in vivo disposition of 9-fluorenone oxime. Moreover, sulfation facilitates the Beckmann-like conversion of 9-fluorenone oxime to phenanthridone. Sulfation alone, however, appears insufficient to account for all of the previously reported in vitro and in vivo rearrangement." @default.
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- W2069969143 date "1986-11-01" @default.
- W2069969143 modified "2023-09-27" @default.
- W2069969143 title "Rat liver aryl sulfotransferase-catalyzed sulfation and rearrangement of 9-fluorenone oxime" @default.
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- W2069969143 doi "https://doi.org/10.1016/0167-4838(86)90099-3" @default.
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