Cross-linked barnase soaked in bromo-ethanol

Experimental Data Snapshot

  • Resolution: 1.95 Å
  • R-Value Work: 0.178 

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On the edge of the denaturation process: Application of X-ray diffraction to barnase and lysozyme cross-linked crystals with denaturants in molar concentrations.

Salem, M.Mauguen, Y.Prange, T.

(2006) Biochim Biophys Acta 1764: 903-912

  • DOI: https://doi.org/10.1016/j.bbapap.2006.02.009
  • Primary Citation of Related Structures:  
    2F2N, 2F30, 2F4A, 2F4G, 2F4Y, 2F56, 2F5M, 2F5W

  • PubMed Abstract: 

    Structural data about the early step of protein denaturation were obtained from cross-linked crystals for two small proteins: barnase and lysozyme. Several denaturant agents like urea, bromoethanol or thiourea were used at increasing concentrations up to a limit leading to crystal disruption (>or=2 to 6 M). Before the complete destruction of the crystal order started, specific binding sites were observed at the protein surfaces, an indication that the preliminary step of denaturation is the disproportion of intermolecular polar bonds to the benefit of the agent "parasiting" the surface. The analysis of the thermal factors first agree with a stabilization effect at low or moderate concentration of denaturants rapidly followed by a destabilization at specific weak points when the number of sites increase (overflooding effect).

  • Organizational Affiliation

    Université René Descartes, Faculté de pharmacie, Laboratoire de cristallographie et RMN biologiques (UMR-8015, CNRS), 4 av. de l'Observatoire 75270 Paris Cedex 06, France.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C
108Bacillus amyloliquefaciensMutation(s): 0 
EC: 3.1.27
Find proteins for P00648 (Bacillus amyloliquefaciens)
Explore P00648 
Go to UniProtKB:  P00648
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00648
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.95 Å
  • R-Value Work: 0.178 
  • Space Group: P 32
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 59.28α = 90
b = 59.28β = 90
c = 81.55γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
SHELXmodel building

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-04-25
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-08-23
    Changes: Data collection, Database references, Derived calculations, Refinement description