2ow6 | pdb_00002ow6

Golgi alpha-mannosidase II complex with (1r,5s,6s,7r,8s)-1-thioniabicyclo[4.3.0]nonan-5,7,8-triol chloride

spinqualitylabelsall models 2ow6, resolution 1.19Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2ow6 is a 1 chain structure with sequence from Drosophila melanogaster. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.19Å Ligands: MRD, NAG, NK1, PO4, ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function MAN2_DROME Catalyzes the first committed step in the biosynthesis of complex N-glycans. It controls conversion of high mannose to complex N-glycans; the final hydrolytic step in the N-glycan maturation pathway (By similarity). 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 Retaining glycosidases operate by a two-step catalytic mechanism in which the transition states are characterized by buildup of a partial positive charge at the anomeric center. Sulfonium-ion analogues of the naturally occurring glycosidase inhibitors, swainsonine and 8-epi-lentiginosine, in which the bridgehead nitrogen atom is replaced by a sulfonium-ion, were synthesized in order to test the hypothesis that a sulfonium salt carrying a permanent positive charge would be an effective glycosidase inhibitor. Initial prediction based on computational docking indicated three plausible binding modes to Drosophila Golgi alpha-mannosidase II (dGMII), the most likely being close to that of swainsonine. Observation of the binding of di-epi-thioswainsonine and 8-epi-thiolentiginosine to dGMII from crystallographic data, however, revealed an orientation different from swainsonine in the active site. Screening these two compounds against dGMII shows that they are inhibitors with IC(50) values of 2.0 and 0.014 mM, respectively. This dramatic difference in affinity between the two compounds, which differ by only one hydroxyl group, is rationalized in terms of bound water molecules and the water molecule substructure in the active site, as identified by comparison of high resolution X-ray crystal structures of several dGMII-inhibitor complexes. Proteins 2007. (c) 2007 Wiley-Liss, Inc. Binding of sulfonium-ion analogues of di-epi-swainsonine and 8-epi-lentiginosine to Drosophila Golgi alpha-mannosidase II: The role of water in inhibitor binding.,Kumar NS, Kuntz DA, Wen X, Pinto BM, Rose DR Proteins. 2007 Dec 12;. PMID:18076078 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Mannosidase 3D structures

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