Crystal Structures of the redesigned protein G variant NuG1

Experimental Data Snapshot

  • Resolution: 1.80 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.261 

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Crystal structures and increased stabilization of the protein G variants with switched folding pathways NuG1 and NuG2

Nauli, S.Kuhlman, B.Le Trong, I.Stenkamp, R.E.Teller, D.C.Baker, D.

(2002) Protein Sci 11: 2924-2931

  • DOI: https://doi.org/10.1110/ps.0216902
  • Primary Citation of Related Structures:  
    1MHX, 1MI0

  • PubMed Abstract: 

    We recently described two protein G variants (NuG1 and NuG2) with redesigned first hairpins that were almost twice as stable, folded 100-fold faster, and had a switched folding mechanism relative to the wild-type protein. To test the structural accuracy of our design algorithm and to provide insights to the dramatic changes in the kinetics and thermodynamics of folding, we have now determined the crystal structures of NuG1 and NuG2 to 1.8 A and 1.85 A, respectively. We find that they adopt hairpin structures that are closer to the computational models than to wild-type protein G; the RMSD of the NuG1 hairpin to the design model and the wild-type structure are 1.7 A and 5.1 A, respectively. The crystallographic B factor in the redesigned first hairpin of NuG1 is systematically higher than the second hairpin, suggesting that the redesigned region is somewhat less rigid. A second round of structure-based design yielded new variants of NuG1 and NuG2, which are further stabilized by 0.5 kcal/mole and 0.9 kcal/mole.

  • Organizational Affiliation

    Department of Biochemistry, University of Washington, Seattle 98195, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
immunoglobulin-binding protein G65Finegoldia magna ATCC 29328Mutation(s): 1 
Find proteins for Q53291 (Finegoldia magna)
Explore Q53291 
Go to UniProtKB:  Q53291
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ53291
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.80 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.261 
  • Space Group: I 4 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 49.458α = 90
b = 49.458β = 90
c = 103.02γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-09-18
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Source and taxonomy, Version format compliance
  • Version 1.3: 2021-10-27
    Changes: Database references
  • Version 1.4: 2024-02-14
    Changes: Data collection, Refinement description