1rls

CRYSTAL STRUCTURE OF RNASE T1 COMPLEXED WITH THE PRODUCT NUCLEOTIDE 3'-GMP. STRUCTURAL EVIDENCE FOR DIRECT INTERACTION OF HISTIDINE 40 AND GLUTAMIC ACID 58 WITH THE 2'-HYDROXYL GROUP OF RIBOSE

spinqualitylabelsall models 1rls, resolution 1.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1rls is a 1 chain structure with sequence from Aspergillus oryzae. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.9Å Ligands: 3GP, CA Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function RNT1_ASPOR 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 crystal structure of RNase T1 complexed with 3'-GMP has been determined. The glycosyl conformation of 3'-GMP is in the syn conformation, and the ribose adopts the O4'-endo pucker. This observed pucker is different from that in any complex structures of RNase T1. In the present complex, this energetically unfavorable conformation is stabilized by the water molecule with the bridged hydrogen bonds between the O2' and the O3' atoms of the ribose. The guanine base is recognized in the same manner as observed in the complex of 2'-GMP. The 2'-hydroxyl group of the ribose shows a tight hydrogen bond to both His-40 and Glu-58 with the suitable geometry for the proton transfer. These hydrogen bonds suggest that the two residues can participate directly in the proton transfer. His-92 is hydrogen bonded to two the proton transfer. His-92 is hydrogen bonded to two oxygen atoms of the phosphate group. Based on the geometry in the active site, the O1P atom may correspond to the O5' atom of the leaving nucleotide in the phosphoryl transfer or a water molecule as a nucleophile in the hydrolysis reaction. In the present complex, the conformations of the 3'-GMP molecule and the side chains of the catalytic residues would be represented as the conformation before the phosphoryl transfer reaction and/or after the hydrolysis reaction. Crystal structure of RNase T1 complexed with the product nucleotide 3'-GMP. Structural evidence for direct interaction of histidine 40 and glutamic acid 58 with the 2'-hydroxyl group of the ribose.,Gohda K, Oka K, Tomita K, Hakoshima T J Biol Chem. 1994 Jul 1;269(26):17531-6. PMID:7912696 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Ribonuclease 3D structures

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