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- W2087132365 abstract "In an earlier study, Liu et al. (Bioorg. Med. Chem. Lett. 1992, 2, 1741-1744) showed that both the E and Z isomers of 4',5'-didehydro-5'-fluoroaristeromycin were very potent irreversible inhibitors of S-adenosylhomocysteine (AdoHcy) hydrolase. However, it was unclear from a mechanistic standpoint whether these vinyl fluorides were themselves type-I mechanism-based inhibitors causing reduction of enzyme-bound NAD+ or whether they were prodrug for aristeromycin-5'-carboxaldehyde, which was the ultimate type-I inhibitor. To elucidate this mechanism of enzyme inhibition, (4'S)- and (4'R)-aristeromycin-5'-carboxaldehydes (1a,b) were synthesized in this study and shown to be potent type-I mechanism-based inhibitors of AdoHcy hydrolase with k2/Ki values of 4.4 x 10(6) and 8.2 x 10(4)M-1min-1, respectively. However, Using 19F NMR and HPLC, it was shown that (4'S)-4,5'-dedehydro-5'-fluoraristeromycin in the presence of AdoHcy hydrolase did not release fluoride ion or generate aristeromycin-5'-carboxaldehyde (1a,b). These results suggest that the E and Z isomers of 4',5'-didehydro-5'-fluoroaristeromycin are inactivating AdoHcy hydrolase by directly reducing NAD+ to NADH and not using the hydrolytic activity of the enzyme to generate aristeromycin-5'-carboxaldehyde." @default.
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- W2087132365 date "1996-01-01" @default.
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- W2087132365 title "Aristeromycin-5‘-carboxaldehyde: A Potent Inhibitor of <i>S</i>-Adenosyl- <scp>l</scp>-homocysteine Hydrolase" @default.
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- W2087132365 doi "https://doi.org/10.1021/jm950916u" @default.
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