Preliminary studies on the inhibition of D-sorbitol-6-phosphate 2-dehydrogenase from Escherichia coli with substrate analogues.
[No authors listed]
摘要
D-Sorbitol-6-phosphate 2-dehydrogenase catalyzes the NADH-dependent conversion of D-fructose 6-phosphate to D-sorbitol 6-phosphate and improved production and purification of the enzyme from Escherichia coli is reported. Preliminary inhibition studies of the enzyme revealed 5-phospho-D-arabinonohydroxamic acid and 5-phospho-D-arabinonate as new substrate analogue inhibitors of the F6P catalyzed reduction with IC50 values of (40 +/- 1) microM and (48 +/- 3) microM and corresponding Km/IC50 ratio values of 14 and 12, respectively. Furthermore, we report here the phosphomannose isomerase substrate D-mannose 6-phosphate as the best inhibitor of E. coli D-sorbitol-6-phosphate 2-dehydrogenase yet reported with an IC50 = 7.5 +/- 0.4 microM and corresponding Km/IC50 ratio = about 76.
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