Experimental Data Snapshot

  • Resolution: 2.01 Å
  • R-Value Free: 0.325 
  • R-Value Work: 0.228 
  • R-Value Observed: 0.228 

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This is version 1.5 of the entry. See complete history


Obligatory steps in protein folding and the conformational diversity of the transition state.

Martinez, J.C.Pisabarro, M.T.Serrano, L.

(1998) Nat Struct Biol 5: 721-729

  • DOI: https://doi.org/10.1038/1418
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    We have analyzed the existence of obligatory steps in the folding reaction of the alpha-spectrin SH3 domain by mutating Asp 48 (D48G), which is at position i+3 of an isolated two-residue type II' beta-turn. Calorimetry and X-ray analysis show an entropic stabilizing effect resulting from local changes at the dihedral angles of the beta-turn. Kinetic analysis of D48G shows that this beta-turn is fully formed in the transition state, while there is no evidence of its formation in an isolated fragment. Introduction of several mutations in the D48G protein reveals that the local stabilization has not significantly altered the transition state ensemble. All these results, together with previous analysis of other alpha-spectrin and src SH3 mutants, indicate that: (i) in the folding reaction there could be obligatory steps which are not necessarily part of the folding nucleus; (ii) transition state ensembles in beta-sheet proteins could be quite defined and conformationally restricted ('mechanic folding nucleus'); and (iii) transition state ensembles in some proteins could be evolutionarily conserved.

  • Organizational Affiliation

    EMBL, Heidelberg, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A-SPECTRIN57Gallus gallusMutation(s): 1 
Find proteins for P07751 (Gallus gallus)
Explore P07751 
Go to UniProtKB:  P07751
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP07751
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.01 Å
  • R-Value Free: 0.325 
  • R-Value Work: 0.228 
  • R-Value Observed: 0.228 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 33.25α = 90
b = 42.22β = 90
c = 49.87γ = 90
Software Package:
Software NamePurpose
X-PLORmodel building
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-02-16
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2021-11-03
    Changes: Database references, Other
  • Version 1.4: 2023-08-02
    Changes: Refinement description
  • Version 1.5: 2024-05-22
    Changes: Data collection