Biological Assembly 1  

 3D View: Structure | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PQS (software)

Biological Assembly 2  

 3D View: Structure | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 2 assigned by authors and generated by PQS (software)

Macromolecule Content

• Total Structure Weight: 103.54 kDa 
• Atom Count: 7388 
• Residue Count: 884 
• Unique protein chains: 1

1UUP

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

• DOI: 10.2210/pdb1UUP/pdb

• Classification: TOXIN
• Organism(s): Streptococcus pyogenes
• Expression System: Escherichia coli BL21
• Mutation(s): No 


• Deposited: 2004-01-08 Released: 2004-08-12 
• Deposition Author(s): Baker, M.D., Gendlina, I., Collins, C.M., Acharya, K.R.

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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 

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

• PubMed: 15295110 
• 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 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.

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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

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Organizational Affiliation: 

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

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
EXOTOXIN TYPE A	A, B, C, D	221	Streptococcus pyogenes	Mutation(s): 0  Gene Names: speA
Find proteins for P0DJY7 (Streptococcus pyogenes) Explore P0DJY7  Go to UniProtKB:  P0DJY7

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ZN	A, B, C, D	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N

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 = 53.3	α = 90
b = 127.2	β = 90
c = 148	γ = 90

Software Package:

Software Name	Purpose
CNS	refinement
DENZO	data reduction
SCALEPACK	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2004-01-08 
• Released Date: 2004-08-12 
Deposition Author(s): Baker, M.D., Gendlina, I., Collins, C.M., Acharya, K.R.

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