5D7I

Structure of human MR1-Ac-6-FP in complex with human MAIT M33.64 TCR


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.180 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.3 of the entry. See complete history


Literature

Diversity of T Cells Restricted by the MHC Class I-Related Molecule MR1 Facilitates Differential Antigen Recognition.

Gherardin, N.A.Keller, A.N.Woolley, R.E.Le Nours, J.Ritchie, D.S.Neeson, P.J.Birkinshaw, R.W.Eckle, S.B.Waddington, J.N.Liu, L.Fairlie, D.P.Uldrich, A.P.Pellicci, D.G.McCluskey, J.Godfrey, D.I.Rossjohn, J.

(2016) Immunity 44: 32-45

  • DOI: https://doi.org/10.1016/j.immuni.2015.12.005
  • Primary Citation of Related Structures:  
    5D5M, 5D7I, 5D7J, 5D7K, 5D7L

  • PubMed Abstract: 

    A characteristic of mucosal-associated invariant T (MAIT) cells is the expression of TRAV1-2(+) T cell receptors (TCRs) that are activated by riboflavin metabolite-based antigens (Ag) presented by the MHC-I related molecule, MR1. Whether the MR1-restricted T cell repertoire and associated Ag responsiveness extends beyond these cells remains unclear. Here, we describe MR1 autoreactivity and folate-derivative reactivity in a discrete subset of TRAV1-2(+) MAIT cells. This recognition was attributable to CDR3β loop-mediated effects within a consensus TRAV1-2(+) TCR-MR1-Ag footprint. Furthermore, we have demonstrated differential folate- and riboflavin-derivative reactivity by a diverse population of "atypical" TRAV1-2(-) MR1-restricted T cells. We have shown that TRAV1-2(-) T cells are phenotypically heterogeneous and largely distinct from TRAV1-2(+) MAIT cells. A TRAV1-2(-) TCR docks more centrally on MR1, thereby adopting a markedly different molecular footprint to the TRAV1-2(+) TCR. Accordingly, diversity within the MR1-restricted T cell repertoire leads to differing MR1-restricted Ag specificity.


  • Organizational Affiliation

    Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, University of Melbourne, Parkville, Victoria 3010, Australia; Cancer Immunology Program, Peter MacCallum Cancer Centre, East Melbourne, Victoria 3002, Australia; ARC Centre of Excellence in Advanced Molecular Imaging, University of Melbourne, Parkville, Victoria 3010, Australia.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Major histocompatibility complex class I-related gene protein
A, C
271Homo sapiensMutation(s): 0 
Gene Names: MR1
UniProt & NIH Common Fund Data Resources
Find proteins for Q95460 (Homo sapiens)
Explore Q95460 
Go to UniProtKB:  Q95460
PHAROS:  Q95460
GTEx:  ENSG00000153029 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ95460
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Beta-2-microglobulin
B, D
100Homo 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  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP61769
Sequence Annotations
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
M33.64 TCR Alpha ChainE [auth G],
G [auth E]
204Homo sapiensMutation(s): 0 
Gene Names: TRAV/TRAV
Entity Groups  
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Sequence Annotations
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  • Reference Sequence
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
M33.64 TCR Beta ChainF [auth H],
H [auth F]
245Homo sapiensMutation(s): 0 
Gene Names: TRBV/TRBC
Entity Groups  
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Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
30W
Query on 30W

Download Ideal Coordinates CCD File 
J [auth A],
P [auth C]
N-(6-formyl-4-oxo-3,4-dihydropteridin-2-yl)acetamide
C9 H7 N5 O3
DDBCPKAHJKOGKK-UHFFFAOYSA-N
PRO
Query on PRO

Download Ideal Coordinates CCD File 
I [auth A],
O [auth C]
PROLINE
C5 H9 N O2
ONIBWKKTOPOVIA-BYPYZUCNSA-N
GOL
Query on GOL

Download Ideal Coordinates CCD File 
K [auth A]
L [auth A]
M [auth B]
N [auth B]
Q [auth C]
K [auth A],
L [auth A],
M [auth B],
N [auth B],
Q [auth C],
R [auth H],
S [auth H],
T [auth H],
U [auth E],
V [auth F]
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.180 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 214.3α = 90
b = 69.66β = 103.99
c = 141.19γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
Aimlessdata scaling
PHASERphasing
PDB_EXTRACTdata extraction
iMOSFLMdata reduction

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-01-27
    Type: Initial release
  • Version 1.1: 2016-02-03
    Changes: Database references
  • Version 1.2: 2016-02-10
    Changes: Refinement description
  • Version 1.3: 2023-09-27
    Changes: Data collection, Database references, Derived calculations, Refinement description