RNase A- 5'-Deoxy-5'-N-morpholinouridine complex

Experimental Data Snapshot

  • Resolution: 1.60 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.183 

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This is version 1.3 of the entry. See complete history


Morpholino, piperidino, and pyrrolidino derivatives of pyrimidine nucleosides as inhibitors of ribonuclease A: synthesis, biochemical, and crystallographic evaluation.

Samanta, A.Leonidas, D.D.Dasgupta, S.Pathak, T.Zographos, S.E.Oikonomakos, N.G.

(2009) J Med Chem 52: 932-942

  • DOI: https://doi.org/10.1021/jm800724t
  • Primary Citation of Related Structures:  
    3D6O, 3D6P, 3D6Q, 3D7B, 3D8Y, 3D8Z

  • PubMed Abstract: 

    Six 5'-deoxy-5'-morpholine, piperidine, and pyrrolidine of pyrimidine nucleosides have been synthesized and characterized. Their inhibitory action to ribonuclease A has been studied by biochemical analysis and X-ray crystallography. These compounds are moderate inhibitors of RNase A with mid-to-upper micromolar inhibition constants (K(i)). The high resolution X-ray crystal structures of the RNase A-inhibitor complexes have shown that all inhibitors bind at the enzyme catalytic cleft with the pyrimidine nucleobase at the B(1)R(2) subsites while the 5' group binds away from the main subsite P(1), where P-O(5') bond cleavage occurs, toward the solvent close to subsite P(0). Structure-activity relationship analysis has demonstrated that the compounds with the larger group in the 5' position are more potent. Comparative structural analysis of these RNase A complexes with other similar RNase A-ligand complexes provides a structural explanation of their potency and suggests ways to improve their efficiency and selectivity. These inhibitors can be the starting point for the development of compounds that can be used as pharmaceuticals against pathologies associated with RNase A homologues such as human angiogenin, which is implicated in tumor induced neovascularization.

  • Organizational Affiliation

    Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, India.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ribonuclease pancreatic
A, B
124Bos taurusMutation(s): 0 
Gene Names: RNASE1RNS1
EC: (PDB Primary Data), (UniProt)
Find proteins for P61823 (Bos taurus)
Explore P61823 
Go to UniProtKB:  P61823
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP61823
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on U2S

Download Ideal Coordinates CCD File 
C [auth A]1-(5-deoxy-5-morpholin-4-yl-alpha-L-arabinofuranosyl)pyrimidine-2,4(1H,3H)-dione
C13 H19 N3 O6
Binding Affinity Annotations 
IDSourceBinding Affinity
U2S Binding MOAD:  3D6P Ki: 1.79e+5 (nM) from 1 assay(s)
PDBBind:  3D6P Ki: 1.79e+5 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 1.60 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.183 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 100.239α = 90
b = 32.823β = 90.41
c = 72.466γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-02-10
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2017-10-11
    Changes: Data collection
  • Version 1.3: 2023-08-30
    Changes: Data collection, Database references, Derived calculations, Refinement description