4HKJ

Structure of Cowpox CPXV203 in complex with MHCI (H-2Kb)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.230 
  • R-Value Observed: 0.231 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural Mechanism of ER Retrieval of MHC Class I by Cowpox.

McCoy, W.H.Wang, X.Yokoyama, W.M.Hansen, T.H.Fremont, D.H.

(2012) PLoS Biol 10: e1001432-e1001432

  • DOI: 10.1371/journal.pbio.1001432
  • Primary Citation of Related Structures:  
    4HKJ

  • PubMed Abstract: 
  • One of the hallmarks of viral immune evasion is the capacity to disrupt major histocompatibility complex class I (MHCI) antigen presentation to evade T-cell detection. Cowpox virus encoded protein CPXV203 blocks MHCI surface expression by exploiting ...

    One of the hallmarks of viral immune evasion is the capacity to disrupt major histocompatibility complex class I (MHCI) antigen presentation to evade T-cell detection. Cowpox virus encoded protein CPXV203 blocks MHCI surface expression by exploiting the KDEL-receptor recycling pathway, and here we show that CPXV203 directly binds a wide array of fully assembled MHCI proteins, both classical and non-classical. Further, the stability of CPXV203/MHCI complexes is highly pH dependent, with dramatically increased affinities at the lower pH of the Golgi relative to the endoplasmic reticulum (ER). Crystallographic studies reveal that CPXV203 adopts a beta-sandwich fold similar to poxvirus chemokine binding proteins, and binds the same highly conserved MHCI determinants located under the peptide-binding platform that tapasin, CD8, and natural killer (NK)-receptors engage. Mutagenesis of the CPXV203/MHCI interface identified the importance of two CPXV203 His residues that confer low pH stabilization of the complex and are critical to ER retrieval of MHCI. These studies clarify mechanistically how CPXV203 coordinates with other cowpox proteins to thwart antigen presentation.


    Organizational Affiliation

    Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, Missouri, United States of America.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
H-2 class I histocompatibility antigen, K-B alpha chainAEIM280Mus musculusMutation(s): 0 
Gene Names: H-2KBH2-KH2-K1
Find proteins for P01901 (Mus musculus)
Explore P01901 
Go to UniProtKB:  P01901
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Beta-2-microglobulinBFJN100Homo sapiensMutation(s): 0 
Gene Names: B2MBETA-2 MICROGLOBULINCDABP0092HDCMA22P
Find proteins for P61769 (Homo sapiens)
Explore P61769 
Go to UniProtKB:  P61769
NIH Common Fund Data Resources
PHAROS  P61769
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
OvalbuminCGKO8Gallus gallusMutation(s): 0 
Gene Names: SERPINB14
Find proteins for P01012 (Gallus gallus)
Explore P01012 
Go to UniProtKB:  P01012
Protein Feature View
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  • Reference Sequence
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
CPXV203 proteinDHLP206Cowpox virus (Brighton Red)Mutation(s): 0 
Gene Names: CPXV203CPXV203 CDS
Find proteins for Q8QMP2 (Cowpox virus (strain Brighton Red))
Explore Q8QMP2 
Go to UniProtKB:  Q8QMP2
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
D,H,L,PL-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.230 
  • R-Value Observed: 0.231 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 88.31α = 76.18
b = 88.25β = 69.29
c = 106.42γ = 66.69
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PHASERphasing
SOLVEphasing
RESOLVEphasing
PHENIXrefinement
PDB_EXTRACTdata extraction
Blu-Icedata collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-11-14
    Type: Initial release
  • Version 1.1: 2012-12-19
    Changes: Database references
  • Version 1.2: 2017-11-15
    Changes: Refinement description