4HKJ

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.230 

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

  • 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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
H-2 class I histocompatibility antigen, K-B alpha chain
A, E, I, M
280Mus musculusMutation(s): 0 
Gene Names: H2-K1 (H2-K)
Find proteins for P01901 (Mus musculus)
Go to UniProtKB:  P01901
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Beta-2-microglobulin
B, F, J, N
100Homo sapiensMutation(s): 0 
Gene Names: B2M
Find proteins for P61769 (Homo sapiens)
Go to Gene View: B2M
Go to UniProtKB:  P61769
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Ovalbumin
C, G, K, O
8Gallus gallusMutation(s): 0 
Gene Names: SERPINB14
Find proteins for P01012 (Gallus gallus)
Go to UniProtKB:  P01012
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
CPXV203 protein
D, H, L, P
206Cowpox virusMutation(s): 0 
Gene Names: CPXV203 CDS
Find proteins for Q8QMP2 (Cowpox virus)
Go to UniProtKB:  Q8QMP2
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
D, H, L, P
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.230 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 88.310α = 76.18
b = 88.250β = 69.29
c = 106.420γ = 66.69
Software Package:
Software NamePurpose
Blu-Icedata collection
PHASERphasing
DENZOdata reduction
PHENIXrefinement
PDB_EXTRACTdata extraction
HKL-2000data reduction
HKL-2000data scaling
SOLVEphasing
SCALEPACKdata scaling
RESOLVEphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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