7QNG

Structure of a MHC I-Tapasin-ERp57 complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.200 

Starting Model: experimental
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This is version 1.1 of the entry. See complete history


Literature

Structure of an MHC I-tapasin-ERp57 editing complex defines chaperone promiscuity.

Muller, I.K.Winter, C.Thomas, C.Spaapen, R.M.Trowitzsch, S.Tampe, R.

(2022) Nat Commun 13: 5383-5383

  • DOI: https://doi.org/10.1038/s41467-022-32841-9
  • Primary Citation of Related Structures:  
    7QNG

  • PubMed Abstract: 

    Adaptive immunity depends on cell surface presentation of antigenic peptides by major histocompatibility complex class I (MHC I) molecules and on stringent ER quality control in the secretory pathway. The chaperone tapasin in conjunction with the oxidoreductase ERp57 is crucial for MHC I assembly and for shaping the epitope repertoire for high immunogenicity. However, how the tapasin-ERp57 complex engages MHC I clients has not yet been determined at atomic detail. Here, we present the 2.7-Å crystal structure of a tapasin-ERp57 heterodimer in complex with peptide-receptive MHC I. Our study unveils molecular details of client recognition by the multichaperone complex and highlights elements indispensable for peptide proofreading. The structure of this transient ER quality control complex provides the mechanistic basis for the selector function of tapasin and showcases how the numerous MHC I allomorphs are chaperoned during peptide loading and editing.


  • Organizational Affiliation

    Institute of Biochemistry, Biocenter, Goethe University Frankfurt, Frankfurt/Main, Germany.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Tapasin419Homo sapiensMutation(s): 0 
Gene Names: TAPBPNGS17TAPA
UniProt & NIH Common Fund Data Resources
Find proteins for O15533 (Homo sapiens)
Explore O15533 
Go to UniProtKB:  O15533
PHAROS:  O15533
GTEx:  ENSG00000231925 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO15533
Glycosylation
Glycosylation Sites: 1Go to GlyGen: O15533-1
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Protein disulfide-isomerase A3505Homo sapiensMutation(s): 1 
Gene Names: PDIA3ERP57ERP60GRP58
EC: 5.3.4.1
UniProt & NIH Common Fund Data Resources
Find proteins for P30101 (Homo sapiens)
Explore P30101 
Go to UniProtKB:  P30101
PHAROS:  P30101
GTEx:  ENSG00000167004 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP30101
Sequence Annotations
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
H-2 class I histocompatibility antigen, D-B alpha chain277Mus musculusMutation(s): 0 
Gene Names: H2-D1
UniProt
Find proteins for P01899 (Mus musculus)
Explore P01899 
Go to UniProtKB:  P01899
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UniProt GroupP01899
Sequence Annotations
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  • Reference Sequence
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Beta-2-microglobulin100Homo sapiensMutation(s): 0 
Gene Names: B2MCDABP0092HDCMA22P
UniProt & NIH Common Fund Data Resources
Find proteins for P61769 (Homo sapiens)
Explore P61769 
Go to UniProtKB:  P61769
PHAROS:  P61769
GTEx:  ENSG00000166710 
Entity Groups  
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UniProt GroupP61769
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 5
MoleculeChains Length2D Diagram Glycosylation3D Interactions
beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
E
3N-Glycosylation
Glycosylation Resources
GlyTouCan:  G15407YE
GlyCosmos:  G15407YE
GlyGen:  G15407YE
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.200 
  • Space Group: P 2 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 74.76α = 90
b = 168.53β = 90
c = 187.05γ = 90
Software Package:
Software NamePurpose
PDB-REDOrefinement
PHENIXrefinement
XDSdata reduction
XDSdata scaling
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
German Research Foundation (DFG)GermanyTA157/12-1
European Research Council (ERC)European Union789121

Revision History  (Full details and data files)

  • Version 1.0: 2022-09-28
    Type: Initial release
  • Version 1.1: 2024-01-31
    Changes: Data collection, Refinement description