Crystal Structure Of Octameric Enolase From Streptococcus pneumoniae

Experimental Data Snapshot

  • Resolution: 2.10 Å
  • R-Value Free: 0.187 
  • R-Value Work: 0.148 
  • R-Value Observed: 0.150 

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Plasmin(Ogen)-Binding Alpha-Enolase from Streptococcus Pneumoniae: Crystal Structure and Evaluation of Plasmin(Ogen)-Binding Sites

Ehinger, S.Schubert, W.-D.Bergmann, S.Hammerschmidt, S.Heinz, D.W.

(2004) J Mol Biol 343: 997

  • DOI: https://doi.org/10.1016/j.jmb.2004.08.088
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Alpha-enolases are ubiquitous cytoplasmic, glycolytic enzymes. In pathogenic bacteria, alpha-enolase doubles as a surface-displayed plasmin(ogen)-binder supporting virulence. The plasmin(ogen)-binding site was initially traced to the two C-terminal lysine residues. More recently, an internal nine-amino acid motif comprising residues 248 to 256 was identified with this function. We report the crystal structure of alpha-enolase from Streptococcus pneumoniae at 2.0A resolution, the first structure both of a plasminogen-binding and of an octameric alpha-enolase. While the dimer is structurally similar to other alpha-enolases, the octamer places the C-terminal lysine residues in an inaccessible, inter-dimer groove restricting the C-terminal lysine residues to a role in folding and oligomerization. The nine residue plasminogen-binding motif, by contrast, is exposed on the octamer surface revealing this as the primary site of interaction between alpha-enolase and plasminogen.

  • Organizational Affiliation

    Division of Structural Biology, GBF-German Research Center for Biotechnology, Mascheroder Weg 1, 38124 Braunschweig, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
444Streptococcus pneumoniae TIGR4Mutation(s): 0 
Find proteins for Q97QS2 (Streptococcus pneumoniae serotype 4 (strain ATCC BAA-334 / TIGR4))
Explore Q97QS2 
Go to UniProtKB:  Q97QS2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ97QS2
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.10 Å
  • R-Value Free: 0.187 
  • R-Value Work: 0.148 
  • R-Value Observed: 0.150 
  • Space Group: I 4
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 143.702α = 90
b = 143.702β = 90
c = 100.579γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-08-22
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2023-12-13
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description