6KWK

Crystal structure of pSLA-1*0401 complex with FMDV-derived epitope MTAHITVPY


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.238 
  • R-Value Observed: 0.240 

wwPDB Validation   3D Report Full Report


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Literature

Peptidomes and Structures Illustrate Two Distinguishing Mechanisms of Alternating the Peptide Plasticity Caused by Swine MHC Class I Micropolymorphism.

Wei, X.Wang, S.Li, Z.Li, Z.Qu, Z.Wang, S.Zou, B.Liang, R.Xia, C.Zhang, N.

(2021) Front Immunol 12: 592447-592447

  • DOI: 10.3389/fimmu.2021.592447
  • Primary Citation of Related Structures:  
    6KWK, 6KWL, 6KWO, 6KWN

  • PubMed Abstract: 
  • The micropolymorphism of major histocompatibility complex class I (MHC-I) can greatly alter the plasticity of peptide presentation, but elucidating the underlying mechanism remains a challenge. Here we investigated the impact of the micropolymorphism on peptide presentation of swine MHC-I (termed swine leukocyte antigen class I, SLA-I) molecules via immunopeptidomes that were determined by our newly developed random peptide library combined with the mass spectrometry (MS) de novo sequencing method (termed RPLD-MS) and the corresponding crystal structures ...

    The micropolymorphism of major histocompatibility complex class I (MHC-I) can greatly alter the plasticity of peptide presentation, but elucidating the underlying mechanism remains a challenge. Here we investigated the impact of the micropolymorphism on peptide presentation of swine MHC-I (termed swine leukocyte antigen class I, SLA-I) molecules via immunopeptidomes that were determined by our newly developed random peptide library combined with the mass spectrometry (MS) de novo sequencing method (termed RPLD-MS) and the corresponding crystal structures. The immunopeptidomes of SLA-1*04:01, SLA-1*13:01, and their mutants showed that mutations of residues 156 and 99 could expand and narrow the ranges of peptides presented by SLA-I molecules, respectively. R156A mutation of SLA-1*04:01 altered the charge properties and enlarged the volume size of pocket D, which eliminated the harsh restriction to accommodate the third (P3) anchor residue of the peptide and expanded the peptide binding scope. Compared with 99 Tyr of SLA-1*0401, 99 Phe of SLA-1*13:01 could not form a conservative hydrogen bond with the backbone of the P3 residues, leading to fewer changes in the pocket properties but a significant decrease in quantitative of immunopeptidomes. This absent force could be compensated by the salt bridge formed by P1-E and 170 Arg . These data illustrate two distinguishing manners that show how micropolymorphism alters the peptide-binding plasticity of SLA-I alleles, verifying the sensitivity and accuracy of the RPLD-MS method for determining the peptide binding characteristics of MHC-I in vitro and helping to more accurately predict and identify MHC-I restricted epitopes.


    Organizational Affiliation

    Department of Microbiology and Immunology, College of Veterinary Medicine, China Agricultural University, Beijing, China.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
MHC class I antigenA275Sus scrofaMutation(s): 0 
Find proteins for A0A0F6N4U7 (Sus scrofa)
Explore A0A0F6N4U7 
Go to UniProtKB:  A0A0F6N4U7
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Beta-2-microglobulinB99Sus scrofaMutation(s): 0 
Gene Names: B2M
Find proteins for Q07717 (Sus scrofa)
Explore Q07717 
Go to UniProtKB:  Q07717
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
peptideC9Foot-and-mouth disease virusMutation(s): 0 
EC: 3.4.22.46 (UniProt), 3.6.1.15 (UniProt), 3.4.22.28 (UniProt), 2.7.7.48 (UniProt)
Find proteins for P03311 (Foot-and-mouth disease virus (isolate -/Spain/S8c1SantaPau/1970 serotype C))
Explore P03311 
Go to UniProtKB:  P03311
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.238 
  • R-Value Observed: 0.240 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 88.671α = 90
b = 77.146β = 119.42
c = 62.317γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHENIXphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Natural Science Foundation of China (NSFC)China31201887

Revision History  (Full details and data files)

  • Version 1.0: 2020-09-09
    Type: Initial release
  • Version 1.1: 2021-03-24
    Changes: Database references