1H1H

Crystal Structure of Eosinophil Cationic Protein in Complex with 2',5'-ADP at 2.0 A resolution Reveals the Details of the Ribonucleolytic Active site


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.205 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The Crystal Structure of Eosinophil Cationic Protein in Complex with 2'5'-Adp at 2.0 A Resolution Reveals the Details of the Ribonucleolytic Active Site

Mohan, C.G.Boix, E.Evans, H.R.Nikolovski, Z.Nogues, M.V.Cuchillo, C.M.Acharya, K.R.

(2002) Biochemistry 41: 12100


  • PubMed Abstract: 
  • Eosinophil cationic protein (ECP) is a component of the eosinophil granule matrix. It shows marked toxicity against helminth parasites, bacteria single-stranded RNA viruses, and host epithelial cells. Secretion of human ECP is related to eosinophil-a ...

    Eosinophil cationic protein (ECP) is a component of the eosinophil granule matrix. It shows marked toxicity against helminth parasites, bacteria single-stranded RNA viruses, and host epithelial cells. Secretion of human ECP is related to eosinophil-associated allergic, asthmatic, and inflammatory diseases. ECP belongs to the pancreatic ribonuclease superfamily of proteins, and the crystal structure of ECP in the unliganded form (determined previously) exhibited a conserved RNase A fold [Boix, E., et al. (1999) Biochemistry 38, 16794-16801]. We have now determined a high-resolution (2.0 A) crystal structure of ECP in complex with adenosine 2',5'-diphosphate (2',5'-ADP) which has revealed the details of the ribonucleolytic active site. Residues Gln-14, His-15, and Lys-38 make hydrogen bond interactions with the phosphate at the P(1) site, while His-128 interacts with the purine ring at the B(2) site. A new phosphate binding site, P(-)(1), has been identified which involves Arg-34. This study is the first detailed structural analysis of the nucleotide recognition site in ECP and provides a starting point for the understanding of its substrate specificity and low catalytic efficiency compared with that of the eosinophil-derived neurotoxin (EDN), a close homologue.


    Organizational Affiliation

    Department of Biology and Biochemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
EOSINOPHIL CATIONIC PROTEIN
A
134Homo sapiensGene Names: RNASE3 (ECP, RNS3)
EC: 3.1.27.-
Find proteins for P12724 (Homo sapiens)
Go to Gene View: RNASE3
Go to UniProtKB:  P12724
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
A2P
Query on A2P

Download SDF File 
Download CCD File 
A
ADENOSINE-2'-5'-DIPHOSPHATE
C10 H15 N5 O10 P2
AEOBEOJCBAYXBA-KQYNXXCUSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
A2PKi: ~6500 nM BINDINGMOAD
A2PKi: 6000 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.205 
  • Space Group: P 63
Unit Cell:
Length (Å)Angle (°)
a = 100.700α = 90.00
b = 100.700β = 90.00
c = 31.700γ = 120.00
Software Package:
Software NamePurpose
AMoREphasing
DENZOdata reduction
SCALEPACKdata scaling
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-10-03
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance