1JWU

Crystal Structure of the Complex of the MHC Class II Molecule HLA-DR1 (HA peptide 306-318) with the superantigen SEC3 Variant 3B2

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.200 

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This is version 1.3 of the entry. See complete history. 


Literature

Structural, energetic, and functional analysis of a protein-protein interface at distinct stages of affinity maturation

Sundberg, E.J., Andersen, P.S., Schlievert, P.M., Karjalainen, K., Mariuzza, R.A.

(2003) Structure 11: 1151-1161

  • DOI: 10.1016/s0969-2126(03)00187-4
  • Primary Citation of Related Structures:  
    1JWM, 1JWS, 1JWU

  • PubMed Abstract: 

    • Due to a paucity of studies that synthesize structural, energetic, and functional analyses of a series of protein complexes representing distinct stages in an affinity maturation pathway, the biophysical basis for the molecular evolution of protein-protein interactions is poorly understood ...

    Due to a paucity of studies that synthesize structural, energetic, and functional analyses of a series of protein complexes representing distinct stages in an affinity maturation pathway, the biophysical basis for the molecular evolution of protein-protein interactions is poorly understood. Here, we combine crystal structures and binding-free energies of a series of variant superantigen (SAG)-major histocompatibility complex (MHC) class II complexes exhibiting increasingly higher affinity to reveal that this affinity maturation pathway is controlled largely by two biophysical factors: shape complementarity and buried hydrophobic surface. These factors, however, do not contribute equivalently to the affinity maturation of the interface, as the former dominates the early steps of the maturation process while the latter is responsible for improved binding in later steps. Functional assays reveal how affinity maturation of the SAG-MHC interface corresponds to T cell activation by SAGs.

    Organizational Affiliation: 

    Center for Advanced Research in Biotechnology, W.M. Keck Laboratory for Structural Biology, University of Maryland Biotechnology Institute, 9600 Gudelsky Drive, Rockville, MD 20850, USA. sundberg@umbi.umd.edu



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
HLA class II histocompatibility antigen, DR alpha chainA182Homo sapiensMutation(s): 0 
Gene Names: HLA-DRA, HLA-DRA1
UniProt & NIH Common Fund Data Resources
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PHAROS:  P01903
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UniProt GroupP01903
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
HLA class II histocompatibility antigen, DR-1 beta chainB190Homo sapiensMutation(s): 0 
Gene Names: HLA-DRB1
UniProt & NIH Common Fund Data Resources
Find proteins for P01911 (Homo sapiens)
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PHAROS:  P01911
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UniProt GroupP01911
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
HA peptideC13N/AMutation(s): 0 
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Enterotoxin type C-3D239Staphylococcus aureusMutation(s): 4 
Gene Names: entC3
UniProt
Find proteins for P0A0L5 (Staphylococcus aureus)
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Go to UniProtKB:  P0A0L5
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UniProt GroupP0A0L5
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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.200 
  • Space Group: H 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 171.753α = 90
b = 171.753β = 90
c = 120.489γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing
CNSrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-07-08
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2021-10-27
    Changes: Database references