Crystal Structure of the Recombinant Onconase from Rana pipiens

Experimental Data Snapshot

  • Resolution: 1.70 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.187 

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This is version 2.2 of the entry. See complete history


Three-state thermal unfolding of onconase.

Casares-Atienza, S.Weininger, U.Camara-Artigas, A.Balbach, J.Garcia-Mira, M.M.

(2011) Biophys Chem 159: 267-274

  • DOI: https://doi.org/10.1016/j.bpc.2011.07.005
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Onconase is a member of the ribonuclease A superfamily currently in phase IIIb clinical trials as a treatment for malign mesothelioma due to its cytotoxic activity selective against tumor-cells. In this work, we have studied the equilibrium thermal unfolding of onconase using a combination of several structural and biophysical techniques. Our results indicate that at least one significantly populated intermediate, which implies the exposure of hydrophobic surface and significant changes in the environment around Trp3, occurs during the equilibrium unfolding process of this protein. The intermediate begins to populate at about 30° below the global unfolding temperature, reaching a maximum population of nearly 60%, 10° below the global unfolding temperature.

  • Organizational Affiliation

    Departamento de Química Física, Facultad de Ciencias, Universidad de Granada. Avda. Fuentenueva s/n. 18071 Granada, Spain.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Onconase104Lithobates pipiensMutation(s): 0 
Gene Names: rpr
Find proteins for P22069 (Lithobates pipiens)
Explore P22069 
Go to UniProtKB:  P22069
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP22069
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.70 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.187 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 32.516α = 90
b = 39.799β = 90
c = 68.536γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-05-19
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Refinement description, Version format compliance
  • Version 1.2: 2017-11-01
    Changes: Refinement description
  • Version 2.0: 2019-12-25
    Changes: Database references, Derived calculations, Polymer sequence
  • Version 2.1: 2023-09-06
    Changes: Data collection, Database references, Derived calculations, Refinement description
  • Version 2.2: 2023-11-08
    Changes: Database references