5D7I | pdb_00005d7i

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 (Depositor), 0.220 (DCC) 
  • R-Value Work: 
    0.178 (Depositor), 0.180 (DCC) 
  • R-Value Observed: 
    0.180 (Depositor) 

Starting Model: experimental
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Ligand Structure Quality Assessment 

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This is version 1.4 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
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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]
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 (Depositor), 0.220 (DCC) 
  • R-Value Work:  0.178 (Depositor), 0.180 (DCC) 
  • R-Value Observed: 0.180 (Depositor) 
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 

Created with Raphaël 2.3.0Worse 01 BetterLigand structure goodness of fit to experimental dataBest fitted 30WClick on this verticalbar to view details

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
  • Version 1.4: 2024-11-20
    Changes: Structure summary