3F8U

Tapasin/ERp57 heterodimer

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.245 
  • R-Value Observed: 0.247 

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


Literature

Insights into MHC class I peptide loading from the structure of the tapasin-ERp57 thiol oxidoreductase heterodimer.

Dong, G., Wearsch, P.A., Peaper, D.R., Cresswell, P., Reinisch, K.M.

(2009) Immunity 30: 21-32

  • DOI: 10.1016/j.immuni.2008.10.018
  • Primary Citation of Related Structures:  
    3F8U

  • PubMed Abstract: 

    • Tapasin is a glycoprotein critical for loading major histocompatibility complex (MHC) class I molecules with high-affinity peptides. It functions within the multimeric peptide-loading complex (PLC) as a disulfide-linked, stable heterodimer with the thiol oxidoreductase ERp57, and this covalent interaction is required to support optimal PLC activity ...

    Tapasin is a glycoprotein critical for loading major histocompatibility complex (MHC) class I molecules with high-affinity peptides. It functions within the multimeric peptide-loading complex (PLC) as a disulfide-linked, stable heterodimer with the thiol oxidoreductase ERp57, and this covalent interaction is required to support optimal PLC activity. Here, we present the 2.6 A resolution structure of the tapasin-ERp57 core of the PLC. The structure revealed that tapasin interacts with both ERp57 catalytic domains, accounting for the stability of the heterodimer, and provided an example of a protein disulfide isomerase family member interacting with substrate. Mutational analysis identified a conserved surface on tapasin that interacted with MHC class I molecules and was critical for peptide loading and editing functions of the tapasin-ERp57 heterodimer. By combining the tapasin-ERp57 structure with those of other defined PLC components, we present a molecular model that illuminates the processes involved in MHC class I peptide loading.

    Organizational Affiliation: 

    Department of Cell Biology, Yale University School of Medicine, New Haven, CT 06520, USA.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Protein disulfide-isomerase A3ERp57A, C481Homo sapiensMutation(s): 1 
Gene Names: PDIA3, ERP57, ERP60, GRP58
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
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
TapasinB, D401Homo sapiensMutation(s): 0 
Gene Names: TAPBP, NGS17, TAPA
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
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAG
Query on NAG
Download Ideal Coordinates CCD File 
E [auth B],
F [auth D]		2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.245 
  • R-Value Observed: 0.247 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 74.101α = 90
b = 72.295β = 94.613
c = 200.193γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
SHARPphasing
CNSrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-01-13
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.2: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Structure summary
  • Version 1.3: 2021-10-20
    Changes: Database references, Structure summary