1PGX

THE 1.66 ANGSTROMS X-RAY STRUCTURE OF THE B2 IMMUNOGLOBULIN-BINDING DOMAIN OF STREPTOCOCCAL PROTEIN G AND COMPARISON TO THE NMR STRUCTURE OF THE B1 DOMAIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.66 Å
  • R-Value Observed: 0.191 

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This is version 1.2 of the entry. See complete history


Literature

1.67-A X-ray structure of the B2 immunoglobulin-binding domain of streptococcal protein G and comparison to the NMR structure of the B1 domain.

Achari, A.Hale, S.P.Howard, A.J.Clore, G.M.Gronenborn, A.M.Hardman, K.D.Whitlow, M.

(1992) Biochemistry 31: 10449-10457

  • DOI: 10.1021/bi00158a006
  • Primary Citation of Related Structures:  
    1PGX

  • PubMed Abstract: 
  • The structure of the B2 immunoglobulin-binding domain of streptococcal protein G has been determined at 1.67-A resolution using a combination of single isomorphous replacement (SIR) phasing and manual fitting of the coordinates of the NMR structure o ...

    The structure of the B2 immunoglobulin-binding domain of streptococcal protein G has been determined at 1.67-A resolution using a combination of single isomorphous replacement (SIR) phasing and manual fitting of the coordinates of the NMR structure of B1 domain of streptococcal protein G [Gronenborn, A. M., et al. (1991) Science 253, 657-661]. The final R value was 0.191 for data between 8.0 and 1.67 A. The structure described here has 13 residues preceding the 57-residue Ig-binding domain and 13 additional residues following it, for a total of 83 residues. The 57-residue binding domain is well-determined in the structure, having an average B factor of 18.0. Only residues 8-77 could be located in the electron density maps, with the ends of the structure fading into disorder. Like the B1 domain, the B2 domain consists of four beta-strands and a single helix lying diagonally across the beta-sheet, with a -1, +3 chi, -1 topology. This small structure is extensively hydrogen-bonded and has a relatively large hydrophobic core. These structural observations may account for the exceptional stability of protein G. A comparison of the B2 domain X-ray structure and the B1 domain NMR structure showed minor differences in the turn between strands and two and a slight displacement of the helix relative to the sheet. Hydrogen bonds between crystallographically related molecules account for most of these differences.


    Related Citations: 
    • 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
    • Structure and Evolution of the Streptococcal Genes Encoding Protein G
      Fahnestock, S.R., Alexander, P., Filpula, D., Nagle, J.
      (1990) Bacterial Immunoglobulin-binding Proteins 1: 133

    Organizational Affiliation

    Protein Engineering Department, Enzon, Incorporated, Gaithersburg, Maryland 20877.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PROTEIN GA83StreptococcusMutation(s): 0 
Find proteins for P06654 (Streptococcus sp. group G)
Explore P06654 
Go to UniProtKB:  P06654
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.66 Å
  • R-Value Observed: 0.191 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 26.04α = 90
b = 34.5β = 100.84
c = 35.95γ = 90
Software Package:
Software NamePurpose
PROFFTrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1992-07-15
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance