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Endogenous and exogenous compounds having a carboxyl group, such as α-arylpropionic acid derivatives, undergo a phase II metabolic reaction to produce an amino acid conjugate through the acyl CoA thioester as well as the acyl glucuronide. It was previously shown that flurbiprofen, one of the nonsteroidal anti-inflammatory drugs, is not subjected to activation of the carboxyl group by the CoA thioester...
The substrate specificity of rat liver peroxisomal 3α,7α,12α-trihydroxy-5β-cholestanoyl-CoA (THCA-CoA) oxidases, which catalyze the dehydrogenation of 3α,7α,12α-trihydroxy-5β-cholestanoic acid (THCA) CoA thioester, having an asymmetric center at C-25, to form (24E)-3α,7α,12α-trihydroxy-5β-cholest-24-enoic acid (Δ 24 -THCA) CoA thioester, was studied. The stable isotope labeled substrates,...
The carboxyl-linked 24-glucuronides of common bile acids have been identified by means of liquid chromatography (LC)/atmospheric pressure chemical ionization (APCI)-mass spectrometry (MS) in an incubation mixture with a male Wistar rat liver microsomal fraction. The authentic specimens of bile acid 24-glucuronide acetate-methyl esters were synthesized unequivocally using the Mitsunobu reaction, and...
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