1MPE

Ensemble of 20 structures of the tetrameric mutant of the B1 domain of streptococcal protein G


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 21 
  • Selection Criteria: structures with least restraint violations and phi, psi angles of residue 46 in allowed region of Ramachrandran plot 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Core mutations switch monomeric protein GB1 into an intertwined tetramer.

Kirsten Frank, M.Dyda, F.Dobrodumov, A.Gronenborn, A.M.

(2002) Nat.Struct.Mol.Biol. 9: 877-885

  • DOI: 10.1038/nsb854
  • Primary Citation of Related Structures:  1MVK

  • PubMed Abstract: 
  • The structure of a mutant immunoglobulin-binding B1 domain of streptococcal protein G (GB1), which comprises five conservative changes in hydrophobic core residues, was determined by NMR spectroscopy and X-ray crystallography. The oligomeric state an ...

    The structure of a mutant immunoglobulin-binding B1 domain of streptococcal protein G (GB1), which comprises five conservative changes in hydrophobic core residues, was determined by NMR spectroscopy and X-ray crystallography. The oligomeric state and quaternary structure of the mutant protein are drastically changed from the wild type protein. The mutant structure consists of a symmetric tetramer, with intermolecular strand exchange involving all four units. Four of the five secondary structure elements present in the monomeric wild type GB1 structure are retained in the tetrameric structure, although their intra- and intermolecular interactions are altered. Our results demonstrate that through the acquisition of a moderate number of pivotal point mutations, proteins such as GB1 are able to undergo drastic structural changes, overcoming reduced stability of the monomeric unit by multimerization. The present structure is an illustrative example of how proteins exploit the breadth of conformational space.


    Related Citations: 
    • Core Mutants of the Immunoglobulin Binding Domain of Streptococcal Protein G: Stability and Structural Integrity
      Gronenborn, A.M.,Frank, M.K.,Clore, G.M.
      (1996) FEBS Lett. 398: 312
    • A Novel, Highly Stable Fold of the Immunoglobulin Binding Domain of Streptococcal Protein G.
      Gronenborn, A.M.,Filpula, D.R.,Essig, N.Z.,Achari, A.,Whitlow, M.,Wingfield, P.T.,Clore, G.M.
      (1991) Science 253: 657


    Organizational Affiliation

    Laboratories of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Immunoglobulin G binding protein G
A, B, C, D
56Streptococcus sp. group GGene Names: spg
Find proteins for P06654 (Streptococcus sp. group G)
Go to UniProtKB:  P06654
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 21 
  • Selection Criteria: structures with least restraint violations and phi, psi angles of residue 46 in allowed region of Ramachrandran plot 
  • Olderado: 1MPE Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-10-30
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance