1GB4

HYPERTHERMOPHILIC VARIANT OF THE B1 DOMAIN FROM STREPTOCOCCAL PROTEIN G, NMR, 47 STRUCTURES


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 75 
  • Conformers Submitted: 47 
  • Selection Criteria: NO RESTRAINT VIOLATIONS GREATER THAN 0.3 ANGSTROMS 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Design, structure and stability of a hyperthermophilic protein variant.

Malakauskas, S.M.Mayo, S.L.

(1998) Nat.Struct.Mol.Biol. 5: 470-475


  • PubMed Abstract: 
  • Here we report the use of an objective computer algorithm in the design of a hyperstable variant of the Streptococcal protein Gbeta1 domain (Gbeta1). The designed seven-fold mutant, Gbeta1-c3b4, has a melting temperature in excess of 100 degrees C an ...

    Here we report the use of an objective computer algorithm in the design of a hyperstable variant of the Streptococcal protein Gbeta1 domain (Gbeta1). The designed seven-fold mutant, Gbeta1-c3b4, has a melting temperature in excess of 100 degrees C and an enhancement in thermodynamic stability of 4.3 kcal mol(-1) at 50 degrees C over the wild-type protein. Gbeta1-c3b4 maintains the Gbeta1 fold, as determined by nuclear magnetic resonance spectroscopy, and also retains a significant level of binding to human IgG in qualitative comparisons with wild type. The basis of the stability enhancement appears to have multiple components including optimized core packing, increased burial of hydrophobic surface area, more favorable helix dipole interactions, and improvement of secondary structure propensity. The design algorithm is able to model such complex contributions simultaneously using empirical physical/chemical potential functions and a combinatorial optimization algorithm based on the dead-end elimination theorem. Because the design methodology is based on general principles, there is the potential of applying the methodology to the stabilization of other unrelated protein folds.


    Organizational Affiliation

    Division of Biology, California Institute of Technology, Pasadena 91125, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
GB1-C3B4
A
57Streptococcus sp. group GGene Names: spg
Find proteins for P19909 (Streptococcus sp. group G)
Go to UniProtKB:  P19909
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 75 
  • Conformers Submitted: 47 
  • Selection Criteria: NO RESTRAINT VIOLATIONS GREATER THAN 0.3 ANGSTROMS 
  • Olderado: 1GB4 Olderado
Software Package:
Software NamePurpose
X-PLORrefinement
X-PLORphasing
X-PLORmodel building

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1998-07-22
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Source and taxonomy, Version format compliance