5OPI

Crystal structure of the TAPBPR-MHC I peptide editing complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.3 Å
  • R-Value Free: 0.303 
  • R-Value Work: 0.242 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of the TAPBPR-MHC I complex defines the mechanism of peptide loading and editing.

Thomas, C.Tampe, R.

(2017) Science 358: 1060-1064

  • DOI: 10.1126/science.aao6001

  • PubMed Abstract: 
  • Adaptive immunity is shaped by a selection of peptides presented on major histocompatibility complex class I (MHC I) molecules. The chaperones Tapasin (Tsn) and TAP-binding protein-related (TAPBPR) facilitate MHC I peptide loading and high-affinity e ...

    Adaptive immunity is shaped by a selection of peptides presented on major histocompatibility complex class I (MHC I) molecules. The chaperones Tapasin (Tsn) and TAP-binding protein-related (TAPBPR) facilitate MHC I peptide loading and high-affinity epitope selection. Despite the pivotal role of Tsn and TAPBPR in controlling the hierarchical immune response, their catalytic mechanism remains unknown. Here, we present the x-ray structure of the TAPBPR-MHC I complex, which delineates the central step of catalysis. TAPBPR functions as peptide selector by remodeling the MHC I α2-1-helix region, stabilizing the empty binding groove, and inserting a loop into the groove that interferes with peptide binding. The complex explains how mutations in MHC I-specific chaperones cause defects in antigen processing and suggests a unifying mechanism of peptide proofreading.


    Organizational Affiliation

    Institute of Biochemistry, Biocenter, Goethe University Frankfurt, Max-von-Laue Strasse 9, 60438 Frankfurt/Main, Germany. c.thomas@em.uni-frankfurt.de tampe@em.uni-frankfurt.de.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
H-2 class I histocompatibility antigen, D-B alpha chain
A
279Mus musculusMutation(s): 0 
Gene Names: H2-D1
Find proteins for P01899 (Mus musculus)
Go to UniProtKB:  P01899
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Beta-2-microglobulin
B
99Homo 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
TAP binding protein-like variant
C
373Homo sapiensMutation(s): 2 
Find proteins for Q53GH5 (Homo sapiens)
Go to UniProtKB:  Q53GH5
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.3 Å
  • R-Value Free: 0.303 
  • R-Value Work: 0.242 
  • Space Group: P 65 2 2
Unit Cell:
Length (Å)Angle (°)
a = 205.040α = 90.00
b = 205.040β = 90.00
c = 121.300γ = 120.00
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata scaling
PHASERphasing
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data

  • Deposited Date: 2017-08-09 
  • Released Date: 2017-10-18 
  • Deposition Author(s): Thomas, C., Tampe, R.

Funding OrganizationLocationGrant Number
German Research FoundationGermanySFB 807/P16

Revision History 

  • Version 1.0: 2017-10-18
    Type: Initial release
  • Version 1.1: 2017-10-25
    Type: Database references
  • Version 1.2: 2017-12-06
    Type: Database references