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- W2094906302 abstract "The enzyme “GluI” is key to the synthesis of critical glycoproteins in the cell.We have determined the structure of GluI, and modeled binding with its unique sugar substrate.The specificity of this interaction derives from a unique conformation of the substrate.Understanding the mechanism of the enzyme is of basic importance and relevant to potential development of antiviral inhibitors. Processing α-glucosidase I (GluI) is a key member of the eukaryotic N-glycosylation processing pathway, selectively catalyzing the first glycoprotein trimming step in the endoplasmic reticulum. Inhibition of GluI activity impacts the infectivity of enveloped viruses; however, despite interest in this protein from a structural, enzymatic, and therapeutic standpoint, little is known about its structure and enzymatic mechanism in catalysis of the unique glycan substrate Glc3Man9GlcNAc2. The first structural model of eukaryotic GluI is here presented at 2-Å resolution. Two catalytic residues are proposed, mutations of which result in catalytically inactive, properly folded protein. Using Autodocking methods with the known substrate and inhibitors as ligands, including a novel inhibitor characterized in this work, the active site of GluI was mapped. From these results, a model of substrate binding has been formulated, which is most likely conserved in mammalian GluI." @default.
- W2094906302 created "2016-06-24" @default.
- W2094906302 creator A5056468452 @default.
- W2094906302 creator A5074180325 @default.
- W2094906302 date "2013-05-01" @default.
- W2094906302 modified "2023-10-14" @default.
- W2094906302 title "Specificity of Processing α-Glucosidase I Is Guided by the Substrate Conformation" @default.
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- W2094906302 doi "https://doi.org/10.1074/jbc.m113.460436" @default.
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