Differential inhibition of HMG-CoA synthase and pancreatic lipase by the specific chiral isomers of beta-lactone DU-6622 |
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Authors: | Tomoda H Ohbayashi N Kumagai H Hashizume H Sunazuka T Omura S |
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Affiliation: | Research Center for Biological Function, Kitasato University, Tokyo, 108-8642, Japan. |
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Abstract: | A synthetic beta-lactone trans-DU-6622 (3-hydroxy-2-(hydroxymethyl)-5-[7-(methylcarbonyl)-naphthalen++ +-1-yl]pentanoic acid 1,3-lactone, a mixture of (2R, 3R)- and (2S, 3S)-beta-lactones) was found to inhibit HMG-CoA synthase (IC(50): 0. 15 microM) and pancreatic lipase (IC(50): 120 microM). The effects of the optically pure DU-6622 isomers on the two enzymes were compared. The (2R, 3R)-isomer was shown to be a highly specific inhibitor of HMG-CoA synthase (IC(50): 0.098 microM vs 270 microM for pancreatic lipase), while the (2S, 3S)-isomer markedly increased the specificity of lipase inhibition (IC(50): 27 microM vs 31 microM for HMG-CoA synthase). Furthermore, the (2R, 3R)-isomer strongly inhibited the binding of [(14)C]hymeglusin to HMG-CoA synthase, indicating that the isomer was bound to the same site of the synthase as hymeglusin. The (2R, 3R)-beta-lactone is responsible for the specific inhibition of HMG-CoA synthase, while the (2S, 3S)-beta-lactone is responsible for the inhibition of pancreatic lipase. |
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