4LCW

The structure of human MAIT TCR in complex with MR1-K43A-RL-6-Me-7OH


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.181 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Antigen-loaded MR1 tetramers define T cell receptor heterogeneity in mucosal-associated invariant T cells.

Reantragoon, R.Corbett, A.J.Sakala, I.G.Gherardin, N.A.Furness, J.B.Chen, Z.Eckle, S.B.Uldrich, A.P.Birkinshaw, R.W.Patel, O.Kostenko, L.Meehan, B.Kedzierska, K.Liu, L.Fairlie, D.P.Hansen, T.H.Godfrey, D.I.Rossjohn, J.McCluskey, J.Kjer-Nielsen, L.

(2013) J Exp Med 210: 2305-2320

  • DOI: 10.1084/jem.20130958
  • Primary Citation of Related Structures:  
    4LCW

  • PubMed Abstract: 
  • Mucosal-associated invariant T cells (MAIT cells) express a semi-invariant T cell receptor (TCR) α-chain, TRAV1-2-TRAJ33, and are activated by vitamin B metabolites bound by the major histocompatibility complex (MHC)-related class I-like molecule, MR ...

    Mucosal-associated invariant T cells (MAIT cells) express a semi-invariant T cell receptor (TCR) α-chain, TRAV1-2-TRAJ33, and are activated by vitamin B metabolites bound by the major histocompatibility complex (MHC)-related class I-like molecule, MR1. Understanding MAIT cell biology has been restrained by the lack of reagents to specifically identify and characterize these cells. Furthermore, the use of surrogate markers may misrepresent the MAIT cell population. We show that modified human MR1 tetramers loaded with the potent MAIT cell ligand, reduced 6-hydroxymethyl-8-D-ribityllumazine (rRL-6-CH₂OH), specifically detect all human MAIT cells. Tetramer(+) MAIT subsets were predominantly CD8(+) or CD4(-)CD8(-), although a small subset of CD4(+) MAIT cells was also detected. Notably, most human CD8(+) MAIT cells were CD8α(+)CD8β(-/lo), implying predominant expression of CD8αα homodimers. Tetramer-sorted MAIT cells displayed a T(H)1 cytokine phenotype upon antigen-specific activation. Similarly, mouse MR1-rRL-6-CH₂OH tetramers detected CD4(+), CD4(-)CD8(-) and CD8(+) MAIT cells in Vα19 transgenic mice. Both human and mouse MAIT cells expressed a broad TCR-β repertoire, and although the majority of human MAIT cells expressed TRAV1-2-TRAJ33, some expressed TRAJ12 or TRAJ20 genes in conjunction with TRAV1-2. Accordingly, MR1 tetramers allow precise phenotypic characterization of human and mouse MAIT cells and revealed unanticipated TCR heterogeneity in this population.


    Organizational Affiliation

    Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity; and 2 Department of Anatomy and Neuroscience; The University of Melbourne, Parkville, Victoria 3010, Australia.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Major histocompatibility complex class I-related gene proteinAC271Homo sapiensMutation(s): 2 
Gene Names: MR1
Find proteins for Q95460 (Homo sapiens)
Explore Q95460 
Go to UniProtKB:  Q95460
NIH Common Fund Data Resources
PHAROS  Q95460
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Beta-2-microglobulinBF99Homo sapiensMutation(s): 0 
Gene Names: B2MCDABP0092HDCMA22P
Find proteins for P61769 (Homo sapiens)
Explore P61769 
Go to UniProtKB:  P61769
NIH Common Fund Data Resources
PHAROS  P61769
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
MAIT T cell receptor alpha chainDG203Homo sapiensMutation(s): 0 
Gene Names: TCR alphaTRA@
Find proteins for Q6P4G7 (Homo sapiens)
Explore Q6P4G7 
Go to UniProtKB:  Q6P4G7
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  • Reference Sequence
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
MAIT T cell receptor beta chainEH245Homo sapiensMutation(s): 0 
Gene Names: TCR betaTRBC1
Find proteins for P01850 (Homo sapiens)
Explore P01850 
Go to UniProtKB:  P01850
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
1VY
Query on 1VY

Download CCD File 
A, C
1-deoxy-1-(7-hydroxy-6-methyl-2,4-dioxo-3,4-dihydropteridin-8(2H)-yl)-D-ribitol
C12 H16 N4 O7
COXMGTTXHPRZBO-BBVRLYRLSA-N
 Ligand Interaction
GOL
Query on GOL

Download CCD File 
A
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.181 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 215.915α = 90
b = 69.361β = 104.3
c = 142.829γ = 90
Software Package:
Software NamePurpose
Blu-Icedata collection
PHASERphasing
BUSTERrefinement
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-10-02
    Type: Initial release
  • Version 1.1: 2013-11-20
    Changes: Database references