2vur

Chemical dissection of the link between Streptozotocin, O-GlcNAc and pancreatic cell death

spinqualitylabelsall models 2vur, resolution 2.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2vur is a 2 chain structure with sequence from Clostridium perfringens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.2Å Ligands: SO4, YX1 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function OGA_CLOP1 Biological function unknown. Capable of hydrolyzing the glycosidic link of O-GlcNAcylated proteins. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed Streptozotocin is a natural product that selectively kills insulin-secreting beta cells, and is widely used to generate mouse models of diabetes or treat pancreatic tumors. Several studies suggest that streptozotocin toxicity stems from its N-nitrosourea moiety releasing nitric oxide and possessing DNA alkylating activity. However, it has also been proposed that streptozotocin induces apoptosis by inhibiting O-GlcNAcase, an enzyme that, together with O-GlcNAc transferase, is important for dynamic intracellular protein O-glycosylation. We have used galacto-streptozotocin to chemically dissect the link between O-GlcNAcase inhibition and apoptosis. Using X-ray crystallography, enzymology, and cell biological studies on an insulinoma cell line, we show that, whereas streptozotocin competitively inhibits O-GlcNAcase and induces apoptosis, its galacto-configured derivative no longer inhibits O-GlcNAcase, yet still induces apoptosis. This supports a general chemical poison mode of action for streptozotocin, suggesting the need for using more specific inhibitors to study protein O-GlcNAcylation. Chemical dissection of the link between streptozotocin, O-GlcNAc, and pancreatic cell death.,Pathak S, Dorfmueller HC, Borodkin VS, van Aalten DM Chem Biol. 2008 Aug 25;15(8):799-807. PMID:18721751 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Beta-Hexosaminidase Beta-Hexosaminidase 3D structures O-GlcNAcase

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