Hydrolysis of glycosylpyridinium ions by anomeric-configuration-inverting glycosidases
作者:Bimali Padmaperuma、Michael L. Sinnott
DOI:10.1016/0008-6215(93)84156-z
日期:1993.12
enhancements of 10(5)-10(8). The efficient hydrolysis of glycosylpyridinium ions by these three inverting glycosidases, the catalytic mechanism of which is unlikely to involve a nucleophile from the enzyme, makes it improbable that the hydrolysis of glycosylpyridinium ions by retainingglycosidases, discovered some years ago, is initiated by addition of a catalytic nucleophilic carboxylate group of the
Hosie, Lynn; Marshall, Philip J.; Sinnott, Michael L., Journal of the Chemical Society. Perkin transactions II, 1984, # 6, p. 1121 - 1132
作者:Hosie, Lynn、Marshall, Philip J.、Sinnott, Michael L.
DOI:——
日期:——
Glucosidase-Catalyzed Hydrolysis of α-<scp>d</scp>-Glucopyranosyl Pyridinium Salts: Kinetic Evidence for Nucleophilic Involvement at the Glucosidation Transition State
作者:Xicai Huang、Kelly S. E. Tanaka、Andrew J. Bennet
DOI:10.1021/ja963733l
日期:1997.11.1
Kinetic isotope effects (KIEs) on the yeast α-glucosidase-catalyzed hydrolysis of two α-d-glucopyranosyl pyridiniumsalts were measured at 25 °C and pH = 6.8. The measured KIEs on kcat for the 2H-2, 13C-1, and 15N-1‘ labeled substrates α-d-glucopyranosyl pyridinium bromide (1) and α-d-glucopyranosyl isoquinolinium bromide (2) were, respectively, 1.115 ± 0.006 and 1.106 ± 0.009, 1.028 ± 0.006 and 1