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4PJ7

Non-classical MHC Class I molecule MR1 with Alpha/Beta T cell receptor at 2.50Å resolution

Data provenance

Structure downloaded from PDB Europe using the Coordinate Server. Aligned to residues 1-180 of 1HHK2 using the CEALIGN3 function of PyMol4. Chain assigment using a Levenshtein distance5 method using data from the PDBe REST API6. Organism data from PDBe REST API. Data for both of these operations from the Molecules endpoint. Structure visualised with 3DMol7.

Information sections

Complex type

Mr1 with alpha beta tcr

1. Beta 2 microglobulin
['B', 'D']
2. MR1
['A', 'C']
3. T cell receptor alpha
TRAV1
['E']
4. T cell receptor beta
TRBV6
['F']

Species

Locus / Allele group

Non-classical MHC Class I molecule

Publication

A molecular basis underpinning the T cell receptor heterogeneity of mucosal-associated invariant T cells.

Eckle SB, Birkinshaw RW, Kostenko L, Corbett AJ, McWilliam HE, Reantragoon R, Chen Z, Gherardin NA, Beddoe T, Liu L, Patel O, Meehan B, Fairlie DP, Villadangos JA, Godfrey DI, Kjer-Nielsen L, McCluskey J, Rossjohn J
J. Exp. Med. (2014) 211, 1585-600 [doi:10.1084/jem.20140484]  [pubmed:25049336] 

Mucosal-associated invariant T (MAIT) cells express an invariant T cell receptor (TCR) α-chain (TRAV1-2 joined to TRAJ33, TRAJ20, or TRAJ12 in humans), which pairs with an array of TCR β-chains. MAIT TCRs can bind folate- and riboflavin-based metabolites restricted by the major histocompatibility complex (MHC)-related class I-like molecule, MR1. However, the impact of MAIT TCR and MR1-ligand heterogeneity on MAIT cell biology is unclear. We show how a previously uncharacterized MR1 ligand, acetyl-6-formylpterin (Ac-6-FP), markedly stabilized MR1, potently up-regulated MR1 cell surface expression, and inhibited MAIT cell activation. These enhanced properties of Ac-6-FP were attributable to structural alterations in MR1 that subsequently affected MAIT TCR recognition via conformational changes within the complementarity-determining region (CDR) 3β loop. Analysis of seven TRBV6-1(+) MAIT TCRs demonstrated how CDR3β hypervariability impacted on MAIT TCR recognition by altering TCR flexibility and contacts with MR1 and the Ag itself. Ternary structures of TRBV6-1, TRBV6-4, and TRBV20(+) MAIT TCRs in complex with MR1 bound to a potent riboflavin-based antigen (Ag) showed how variations in TRBV gene usage exclusively impacted on MR1 contacts within a consensus MAIT TCR-MR1 footprint. Moreover, differential TRAJ gene usage was readily accommodated within a conserved MAIT TCR-MR1-Ag docking mode. Collectively, MAIT TCR heterogeneity can fine-tune MR1 recognition in an Ag-dependent manner, thereby modulating MAIT cell recognition.

Structure deposition and release

Deposited: 2014-05-12
Released: 2014-07-02
Revised: 2014-10-01

Data provenance

Publication data retrieved from PDBe REST API8 and PMCe REST API9

Other structures from this publication

Chain sequences

1. Beta 2 microglobulin
Beta 2 microglobulin
        10        20        30        40        50        60
IQRTPKIQVYSRHPAENGKSNFLNCYVSGFHPSDIEVDLLKNGERIEKVEHSDLSFSKDW
        70        80        90
SFYLLYYTEFTPTEKDEYACRVNHVTLSQPKIVKWDRDM
2. MR1
MR1
        10        20        30        40        50        60
MRTHSLRYFRLGVSDPIHGVPEFISVGYVDSHPITTYDSVTRQKEPRAPWMAENLAPDHW
        70        80        90       100       110       120
ERYTQLLRGWQQMFKVELKRLQRHYNHSGSHTYQRMIGCELLEDGSTTGFLQYAYDGQDF
       130       140       150       160       170       180
LIFNKDTLSWLAVDNVAHTIKQAWEANQHELLYQKNWLEEECIAWLKRFLEYGKDTLQRT
       190       200       210       220       230       240
EPPLVRVNRKETFPGVTALFCKAHGFYPPEIYMTWMKNGEEIVQEIDYGDILPSGDGTYQ
       250       260       270
AWASIELDPQSSNLYSCHVEHSGVHMVLQVP
3. T cell receptor alpha
T cell receptor alpha
TRAV1
        10        20        30        40        50        60
GQNIDQPTEMTATEGAIVQINCTYQTSGFNGLFWYQQHAGEAPTFLSYNVLDGLEEKGRF
        70        80        90       100       110       120
SSFLSRSKGYSYLLLKELQMKDSASYLCAVMDSNYQLIWGAGTKLIIKPDIQNPDPAVYQ
       130       140       150       160       170       180
LRDSKSSDKSVCLFTDFDSQTNVSQSKDSDVYITDKCVLDMRSMDFKSNSAVAWSNKSDF
       190       200
ACANAFNNSIIPEDTFFPSPESS
4. T cell receptor beta
T cell receptor beta
TRBV6
        10        20        30        40        50        60
MIAGITQAPTSQILAAGRRMTLRCTQDMRHNAMYWYRQDLGLGLRLIHYSNTAGTTGKGE
        70        80        90       100       110       120
VPDGYSVSRANTDDFPLTLASAVPSQTSVYFCASSGGTNNEQFFGPGTRLTVLEDLKNVF
       130       140       150       160       170       180
PPEVAVFEPSEAEISHTQKATLVCLATGFYPDHVELSWWVNGKEVHSGVCTDPQPLKEQP
       190       200       210       220       230       240
ALNDSRYALSSRLRVSATFWQNPRNHFRCQVQFYGLSENDEWTQDRAKPVTQIVSAEAWG

RAD

Data provenance

Sequences are retrieved via the Uniprot method of the RSCB REST API. Sequences are then compared to those derived from the PDB file and matched against sequences retrieved from the IPD-IMGT/HLA database for human sequences, or the IPD-MHC database for other species. Mouse sequences are matched against FASTA files from Uniprot. Sequences for the mature extracellular protein (signal petide and cytoplasmic tail removed) are compared to identical length sequences from the datasources mentioned before using either exact matching or Levenshtein distance based matching.

Downloadable data

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Complete structures

Aligned structures [cif]
  1. 4PJ7 assembly 1  

Components

MHC Class I alpha chain [cif]
  1. 4PJ7 assembly 1  
MHC Class I antigen binding domain (alpha1/alpha2) [cif]
  1. 4PJ7 assembly 1  

Derived data

Data for this page [json]
https://api.histo.fyi/v1/structures/4pj7

Data license

The data above is made available under a Creative Commons CC-BY 4.0 license. This means you can copy, remix, transform, build upon and redistribute the material, but you must give appropriate credit, provide a link to the license, and indicate if changes were made.
If you use any data downloaded from this site in a publication, please cite 'https://www.histo.fyi/'. A preprint is in preparation.

Footnotes


Creative Commons Licence
This work is licensed under a Creative Commons Attribution 4.0 International License.