1s2d

Purine 2'-Deoxyribosyl complex with arabinoside: Ribosylated Intermediate (AraA)

spinqualitylabelsall models 1s2d, resolution 2.10Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1s2d is a 3 chain structure with sequence from "bacillus_casei_e"_von_freudenreich_and_thoni_1904 "bacillus casei e" von freudenreich and thoni 1904. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ADE, V3M Related: 1f8y, 1s2g, 1s2i, 1s2l, 1s3f Gene: ptd, ndtA, ntd_1, BC335_1936, BCM45_08885, BDKNPLJD_00991, DM475_00825, GDZ32_10450, LH5_01102 ("Bacillus casei e" von Freudenreich and Thoni 1904) Activity: Nucleoside deoxyribosyltransferase, with EC number 2.4.2.6 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT 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 The structure of class I N-deoxyribosyltransferase from Lactobacillus helveticus was determined by X-ray crystallography. Unlike class II N-deoxyribosyltransferases, which accept either purine or pyrimidine deoxynucleosides, class I enzymes are specific for purines as both the donor and acceptor base. Both class I and class II enzymes are highly specific for deoxynucleosides. The class I structure reveals similarities with the previously determined class II enzyme from Lactobacillus leichmanni [Armstrong, S. A., Cook, W. J., Short, S. A., and Ealick, S. E. (1996) Structure 4, 97-107]. The specificity of the class I enzyme for purine deoxynucleosides can be traced to a loop (residues 48-62), which shields the active site in the class II enzyme. In the class I enzyme, the purine base itself shields the active site from the solvent, while the smaller pyrimidine base cannot. The structure of the enzyme with a bound ribonucleoside shows that the nucleophilic oxygen atom of Glu101 hydrogen bonds to the O2' atom, rendering it unreactive and thus explaining the specificity for 2'-deoxynucleosides. The structure of a ribosylated enzyme intermediate reveals movements that occur during cleavage of the N-glycosidic bond. The structures of complexes with substrates and substrate analogues show that the purine base can bind in several different orientations, thus explaining the ability of the enzyme to catalyze alternate deoxyribosylation at the N3 or N7 position. Structures of purine 2'-deoxyribosyltransferase, substrate complexes, and the ribosylated enzyme intermediate at 2.0 A resolution.,Anand R, Kaminski PA, Ealick SE Biochemistry. 2004 Mar 9;43(9):2384-93. PMID:14992575 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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