Abstract
O-GlcNAcylation is an essential posttranslational modification in metazoa. Modulation of O-GlcNAc levels with small molecule inhibitors of O-GlcNAc hydrolase (OGA) is a useful strategy to probe the role of this modification in a range of cellular processes. Here we report the discovery of novel, low molecular weight and drug-like O-GlcNAcase inhibitor scaffolds by high-throughput screening. Kinetic and X-ray crystallographic analyses of the binding modes with human/bacterial O-GlcNAcases identify some of these as competitive inhibitors. Comparative kinetic experiments with the mechanistically related human lysosomal hexosaminidases reveal that three of the inhibitor scaffolds show selectivity towards human OGA. These scaffolds provide attractive starting points for the development of non-carbohydrate, drug-like OGA inhibitors.
Copyright 2009 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Adenine / analogs & derivatives
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Adenine / chemistry
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Adenine / metabolism
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Adenine / pharmacology
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Bacterial Proteins / antagonists & inhibitors*
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Bacterial Proteins / chemistry
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Bacterial Proteins / metabolism
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Catalysis / drug effects
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Catalytic Domain
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Clostridium perfringens / enzymology
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Crystallography, X-Ray
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Dose-Response Relationship, Drug
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Drug Discovery / methods*
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Drug Evaluation, Preclinical
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Dyphylline / chemistry
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Dyphylline / pharmacology
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Enzyme Inhibitors / chemistry
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Enzyme Inhibitors / metabolism
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Enzyme Inhibitors / pharmacology*
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Humans
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Kinetics
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Models, Molecular
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Protein Binding
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Protein Structure, Tertiary
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Spectrometry, Fluorescence
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beta-N-Acetylhexosaminidases / antagonists & inhibitors*
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beta-N-Acetylhexosaminidases / chemistry
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beta-N-Acetylhexosaminidases / metabolism
Substances
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Bacterial Proteins
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Enzyme Inhibitors
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N(6)-methoxyadenine
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Dyphylline
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hexosaminidase C
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beta-N-Acetylhexosaminidases
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Adenine