1MHH

Structure of P. magnus protein L mutant bound to a mouse Fab


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.197 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Evidence for plasticity and structural mimicry at the immunoglobulin light chain-protein L interface

Graille, M.Harrison, S.Crump, M.P.Findlow, S.C.Housden, N.G.Muller, B.H.Battail-Poirot, N.Sibai, G.Sutton, B.J.Taussig, M.J.Jolivet-Reynaud, C.Gore, M.G.Stura, E.A.

(2002) J.Biol.Chem. 277: 47500-47506

  • DOI: 10.1074/jbc.M206105200

  • PubMed Abstract: 
  • The multidomain bacterial surface protein L (PpL) is a virulence factor expressed by only 10% of Peptostreptococcus magnus strains, and its expression is correlated with bacterial vaginosis. The molecular basis for its ability to recognize 60% of mam ...

    The multidomain bacterial surface protein L (PpL) is a virulence factor expressed by only 10% of Peptostreptococcus magnus strains, and its expression is correlated with bacterial vaginosis. The molecular basis for its ability to recognize 60% of mammalian immunoglobulin light chain variable regions (V(L)) has been described recently by x-ray crystallography, which suggested the presence of two V(L) binding sites on each protein L domain (Graille, M., Stura, E. A., Housden, N. G., Beckingham, J. A., Bottomley, S. P., Beale, D., Taussig, M. J., Sutton, B. J., Gore, M. G., and Charbonnier, J. (2001) Structure 9, 679-687). Here, we report the crystal structure at 2.1 A resolution of a protein L mutant complexed to an Fab' fragment with only 50% of the V(L) residues interacting with PpL site 1 conserved. Comparison of the site 1 interface from both structures shows how protein L is able to accommodate these sequence differences and therefore bind to a large repertoire of Ig. The x-ray structure and NMR results confirm the existence of two V(L) binding sites on a single protein L domain. These sites exhibit a remarkable structural mimicry of growth factors binding to their receptors. This could explain the protein L superantigenic activity on human B lymphocytes.


    Related Citations: 
    • Complex between Peptostreptococcus Magnus Protein L and a Human Antibody Reveals Structural Convergence in the Interaction Modes of Fab Binding Modes
      Graille, M.,Stura, E.A.,Housden, N.G.,Beckingham, J.A.,Bottomley, S.P.,Beale, D.,Taussig, M.J.,Sutton, B.J.,Gore, M.G.,Charbonnier, J.-B.
      (2001) Structure 9: 679


    Organizational Affiliation

    Laboratoire de Structure des Protéines, Département d'Ingénierie et d'Etudes des Protéines (DIEP), Commissariat à l'Energie Atomique, Centre d'Etudes de Saclay, Gif-sur-Yvette, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Fab, light chain
A, C
220N/AN/A
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Fab, heavy chain
B, D
217N/AN/A
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
protein L domain C
E, F
63N/AN/A
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
EDO
Query on EDO

Download SDF File 
Download CCD File 
B, D
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
AEA
Query on AEA
A, C
L-PEPTIDE LINKINGC5 H10 N2 O3 S

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.197 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 78.486α = 90.00
b = 100.957β = 90.00
c = 149.147γ = 90.00
Software Package:
Software NamePurpose
AMoREphasing
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-01-14
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Source and taxonomy, Version format compliance
  • Version 1.3: 2018-01-03
    Type: Database references, Structure summary