1UUP

Crystal Structure of A Dimeric Form of Streptococcal Pyrogenic Exotoxin A (SpeA1).


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.282 
  • R-Value Work: 0.215 
  • R-Value Observed: 0.215 

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This is version 1.3 of the entry. See complete history


Literature

Crystal Structure of a Dimeric Form of Streptococcal Pyrogenic Exotoxin a (Spea1)

Baker, M.D.Gendlina, I.Collins, C.M.Acharya, K.R.

(2004) Protein Sci 13: 2285

  • DOI: 10.1110/ps.04826804
  • Primary Citation of Related Structures:  
    1UUP

  • PubMed Abstract: 
  • Streptococcal pyrogenic exotoxin A (SpeA1) is a bacterial superantigen associated with scarlet fever and streptococcal toxic shock syndrome (STSS). SpeA1 is found in both monomeric and dimeric forms, and previous work suggested that the dimer results ...

    Streptococcal pyrogenic exotoxin A (SpeA1) is a bacterial superantigen associated with scarlet fever and streptococcal toxic shock syndrome (STSS). SpeA1 is found in both monomeric and dimeric forms, and previous work suggested that the dimer results from an intermolecular disulfide bond between the cysteines at positions 90 of each monomer. Here, we present the crystal structure of the dimeric form of SpeA1. The toxin crystallizes in the orthorhombic space group P212121, with two dimers in the crystallographic asymmetric unit. The final structure has a crystallographic R-factor of 21.52% for 7248 protein atoms, 136 water molecules, and 4 zinc atoms (one zinc atom per molecule). The implications of SpeA1 dimer on MHC class II and T-cell receptor recognition are discussed.


    Related Citations: 
    • Structural Basis for the Recognition of Superantigen Steptococcal Pyrogenic Exotoxin A1 (Spea1) by Mhc Classii Molecules and T-Cell Receptors
      Papageorgiou, A.C., Collins, C.M., Gutman, D.M., Kline, J.B., O'Brian, S.M., Tranter, H.S., Acharya, K.R.
      (1999) EMBO J 18: 9

    Organizational Affiliation

    Department of Biology and Biochemistry, Building 4 South, University of Bath, Claverton Down, Bath BA2 7AY, UK.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
EXOTOXIN TYPE AABCD221Streptococcus pyogenesMutation(s): 0 
Gene Names: speA
Find proteins for P0DJY7 (Streptococcus pyogenes)
Explore P0DJY7 
Go to UniProtKB:  P0DJY7
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.282 
  • R-Value Work: 0.215 
  • R-Value Observed: 0.215 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 53.3α = 90
b = 127.2β = 90
c = 148γ = 90
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-08-12
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-10-24
    Changes: Data collection, Source and taxonomy