3D6O

The RNase A- 5'-Deoxy-5'-N-(ethyl isonipecotatyl)uridine complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.58 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.188 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

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: 10.1021/jm800724t
  • Structures With Same Primary Citation

  • 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 a ...

    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.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Ribonuclease pancreatic
A, B
124Bos taurusMutation(s): 0 
Gene Names: RNASE1RNS1
EC: 3.1.27.5 (PDB Primary Data), 4.6.1.18 (UniProt)
Find proteins for P61823 (Bos taurus)
Go to UniProtKB:  P61823
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
U1S
Query on U1S

Download CCD File 
A
1-{5-deoxy-5-[4-(ethoxycarbonyl)piperidin-1-yl]-alpha-L-arabinofuranosyl}pyrimidine-2,4(1H,3H)-dione
C17 H25 N3 O7
JCIDLMJUELAXRU-SPWCGHHHSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
U1SKi:  77000   nM  PDBBind
U1SKi:  77000   nM  Binding MOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.58 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.188 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 100.384α = 90
b = 32.876β = 90.4
c = 72.621γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
ADSCdata collection
DENZOdata reduction
SCALEPACKdata scaling
REFMACphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-02-10
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance