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- W1867203471 abstract "2-Arylpropionic acids are a class of frequently used nonsteroidal anti-inflammatory drugs exhibiting a potent inhibition of cyclooxygenase isoforms supported by the (+)S-enantiomer alone. Nevertheless, some of these compounds in the (-)R configuration may undergo extensive inversion of configuration to their antipode. The key molecular basis for this mechanism invokes the stereoselective formation of the coenzyme A (CoA) thioester of the 2-arylpropionic acid by long-chain acyl-CoA synthetases (ACSs). In this report, rat recombinant ACS1 and ACS2 enzymes, constitutively highly expressed in adult rat liver and brain, respectively, have been overproduced in Escherichia coli strains and purified to homogeneity to investigate the involvement of these enzymes in the thioesterification of fenoprofen and ibuprofen. Recombinant ACS1 efficiently catalyzed both nonsteroidal anti-inflammatory drugs with Michaelis-Menten parameters of K(M) = 1686 +/- 93 microM, V(max) = 353 +/- 45 nmol/min/mg protein for (-)R-ibuprofen and K(M) = 103 +/- 12 microM, V(max) = 267 +/- 10 nmol/min/mg protein for (-)R-fenoprofen, and exhibited a marked stereoselectivity in favor of the (-)R-enantiomer. Recombinant ACS2, a closely related sequence with ACS1, exhibited a lower enzymatic efficacy from 7- to 130-fold for (-)R-ibuprofen and (-)R-fenoprofen, respectively. On the basis of these findings and considering the level of tissue expression of the different long-chain ACSs, ACS1 appears to be the major enzyme involved in the first step of the chiral inversion of 2-arylpropionic acids. Nevertheless, the participation of other ACS isoforms of minor quantitative importance could not be excluded in the thioesterification of xenobiotics." @default.
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- W1867203471 date "2000-04-01" @default.
- W1867203471 modified "2023-10-18" @default.
- W1867203471 title "Thioesterification of 2-arylpropionic acids by recombinant acyl-coenzyme A synthetases (ACS1 and ACS2)." @default.
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