2g8q
From Proteopedia
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The crystal structure of RNase A from monoclinic crystals at 100 K
Overview
The binding of a moderate inhibitor, 3'-N-piperidine-4-carboxyl-3'-deoxy-ara-uridine, to ribonuclease A has, been studied by X-ray crystallography at 1.7A resolution. Two inhibitor, molecules are bound in the central RNA binding cavity of RNase A, exploiting interactions with residues from peripheral binding sites rather, than from the active site of the enzyme. The uracyl moiety of the first, inhibitor molecule occupies the purine-preferring site of RNase A, while, the rest of the molecule projects to the solvent. The second inhibitor, molecule binds with the carboxyl group at the pyrimidine recognition site, and the uridine moiety exploits interactions with RNase A residues Lys66, His119 and Asp121. Comparative structural analysis of the, 3'-N-piperidine-4-carboxyl-3'-deoxy-ara-uridine complex with other RNase, A-ligand complexes provides a structural explanation of its potency. The, crystal structure of the RNase, A-3'-N-piperidine-4-carboxyl-3'-deoxy-ara-uridine complex provides, evidence of a novel ligand-binding pattern in RNase A for, 3'-N-aminonucleosides that was not anticipated by modelling studies, while, it also suggests ways to improve the efficiency and selectivity of such, compounds to develop pharmaceuticals against pathologies associated with, RNase A homologues.
About this Structure
2G8Q is a Single protein structure of sequence from Bos taurus. Active as Pancreatic ribonuclease, with EC number 3.1.27.5 Full crystallographic information is available from OCA.
Reference
The binding of 3'-N-piperidine-4-carboxyl-3'-deoxy-ara-uridine to ribonuclease A in the crystal., Leonidas DD, Maiti TK, Samanta A, Dasgupta S, Pathak T, Zographos SE, Oikonomakos NG, Bioorg Med Chem. 2006 Sep 1;14(17):6055-64. Epub 2006 May 30. PMID:16730994
Page seeded by OCA on Wed Nov 21 11:02:12 2007
