Journal
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
Volume 98, Issue 14, Pages 6317-6328Publisher
SPRINGER
DOI: 10.1007/s00253-014-5587-9
Keywords
Aglycon specificity; alpha-glucosidase; Transglucosylation kinetics; Hydrolysis kinetics; Substrate inhibition; Hydroxybenzyl alcohol
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Funding
- Ministry of Science of the Republic of Serbia [172049, 046010, 451-03-00605/2012-16/51]
- FP7 Reg Pot FCUB ERA, GA [256716]
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Our investigation of the catalytic properties of Saccharomyces cerevisiae alpha-glucosidase (AGL) using hydroxybenzyl alcohol (HBA) isomers as transglucosylation substrates and their glucosides in hydrolytic reactions demonstrated interesting findings pertaining to the aglycon specificity of this important enzyme. AGL specificity increased from the para(p)- to the ortho(o)-HBA isomer in transglucosylation, whereas such AGL aglycon specificity was not seen in hydrolysis, thus indicating that the second step of the reaction (i.e., binding of the glucosyl acceptor) is rate-determining. To study the influence of substitution pattern on AGL kinetics, we compared AGL specificity, inferred from kinetic constants, for HBA isomers and other aglycon substrates. The demonstrated inhibitory effects of HBA isomers and their corresponding glucosides on AGL-catalyzed hydrolysis of p-nitrophenyl a-glucoside (PNPG) suggest that HBA glucosides act as competitive, whereas HBA isomers are noncompetitive, inhibitors. As such, we postulate that aromatic moieties cannot bind to an active site unless an enzyme-glucosyl complex has already formed, but they can interact with other regions of the enzyme molecule resulting in inhibition.
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