5KSU

Crystal structure of HLA-DQ2.5-CLIP1 at 2.73 resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.73 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.193 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Unraveling the structural basis for the unusually rich association of human leukocyte antigen DQ2.5 with class-II-associated invariant chain peptides.

Nguyen, T.B.Jayaraman, P.Bergseng, E.Madhusudhan, M.S.Kim, C.Y.Sollid, L.M.

(2017) J Biol Chem 292: 9218-9228

  • DOI: https://doi.org/10.1074/jbc.M117.785139
  • Primary Citation of Related Structures:  
    5KSU, 5KSV

  • PubMed Abstract: 

    Human leukocyte antigen (HLA)-DQ2.5 ( DQA1 * 05/DQB1 * 02 ) is a class-II major histocompatibility complex protein associated with both type 1 diabetes and celiac disease. One unusual feature of DQ2.5 is its high class-II-associated invariant chain peptide (CLIP) content. Moreover, HLA-DQ2.5 preferentially binds the non-canonical CLIP2 over the canonical CLIP1. To better understand the structural basis of HLA-DQ2.5's unusual CLIP association characteristics, better insight into the HLA-DQ2.5·CLIP complex structures is required. To this end, we determined the X-ray crystal structure of the HLA-DQ2.5· CLIP1 and HLA-DQ2.5·CLIP2 complexes at 2.73 and 2.20 Å, respectively. We found that HLA-DQ2.5 has an unusually large P4 pocket and a positively charged peptide-binding groove that together promote preferential binding of CLIP2 over CLIP1. An α9-α22-α24-α31-β86-β90 hydrogen bond network located at the bottom of the peptide-binding groove, spanning from the P1 to P4 pockets, renders the residues in this region relatively immobile. This hydrogen bond network, along with a deletion mutation at α53, may lead to HLA-DM insensitivity in HLA-DQ2.5. A molecular dynamics simulation experiment reported here and recent biochemical studies by others support this hypothesis. The diminished HLA-DM sensitivity is the likely reason for the CLIP-rich phenotype of HLA-DQ2.5.


  • Organizational Affiliation

    the Bioinformatics Institute, Singapore 138671, Singapore.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
HLA class II histocompatibility antigen, DQ alpha 1 chain
A, D
199Homo sapiensMutation(s): 0 
Gene Names: HLA-DQA1
UniProt & NIH Common Fund Data Resources
Find proteins for P01909 (Homo sapiens)
Explore P01909 
Go to UniProtKB:  P01909
PHAROS:  P01909
GTEx:  ENSG00000196735 
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UniProt GroupP01909
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
MHC class II HLA-DQ-beta-1
B, E
204Homo sapiensMutation(s): 0 
Gene Names: HLA-DQB1
UniProt
Find proteins for Q5Y7D3 (Homo sapiens)
Explore Q5Y7D3 
Go to UniProtKB:  Q5Y7D3
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UniProt GroupQ5Y7D3
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  • Reference Sequence

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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
HLA class II histocompatibility antigen gamma chain
C, F
15Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P04233 (Homo sapiens)
Explore P04233 
Go to UniProtKB:  P04233
PHAROS:  P04233
GTEx:  ENSG00000019582 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP04233
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.73 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.193 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 128.86α = 90
b = 69.21β = 110.29
c = 146.69γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
XSCALEdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2017-04-05
    Type: Initial release
  • Version 1.1: 2018-04-18
    Changes: Data collection, Database references
  • Version 1.2: 2023-10-04
    Changes: Data collection, Database references, Refinement description