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6MP0

Single chain construct of H2-Db binding "None" at 2.00Å 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

Single chain class i construct

1. Class I alpha
H2-Db
['A']

Species


Locus / Allele group


Publication

Altered binding of tumor antigenic peptides to MHC class I affects CD8 T cell effector responses.

Clancy-Thompson E, Devlin CA, Tyler PM, Servos MM, Ali LR, Ventre KS, Bhuiyan MA, Bruck PT, Birnbaum ME, Dougan SK
Cancer Immunol Res (2018) [doi:10.1158/2326-6066.CIR-18-0348]  [pubmed:30352798

T-cell priming occurs when a naïve T cell recognizes cognate peptide-MHC complexes on an activated antigen-presenting cell. The circumstances of this initial priming have ramifications on the fate of the newly primed T cell. Newly primed CD8+ T cells can embark onto different trajectories, with some becoming short-lived effector cells and others adopting a tissue resident or memory cell fate. To determine whether T-cell priming influences the quality of the effector T-cell response to tumors, we used transnuclear CD8+ T cells that recognize the melanoma antigen TRP1 using TRP1high or TRP1low TCRs that differ in both affinity and fine specificity. From a series of altered peptide ligands, we identified a point mutation (K8) in a nonanchor residue that, when analyzed crystallographically and biophysically, destabilized the peptide interaction with the MHC binding groove. In vitro, the K8 peptide induced robust proliferation of both TRP1high and TRP1low CD8+ T cells but did not induce expression of PD-1. Cytokine production from K8-stimulated TRP1 cells was minimal, whereas cytotoxicity was increased. Upon transfer into B16 tumor-bearing mice, the reference peptide (TRP1-M9)- and K8-stimulated TRP1 cells were equally effective at controlling tumor growth but accomplished this through different mechanisms. TRP1-M9-stimulated cells produced more IFNγ, whereas K8-stimulated cells accumulated to higher numbers and were more cytotoxic. We, therefore, conclude that TCR recognition of weakly binding peptides during priming can skew the effector function of tumor-specific CD8+ T cells.

Structure deposition and release

Deposited: 2018-10-05
Released: 2018-11-07
Revised: 2020-07-29

Data provenance

Publication data retrieved from PDBe REST API8 and PMCe REST API9

Other structures from this publication


Binding cleft pockets


Peptide sidechain binding pockets (static)
Peptide terminii and backbone binding residues (static)
A Pocket

GLY159
PRO163
SER167
VAL171
ASN5
ILE59
MET63
ASN66
GLY7
B Pocket

SER24
TYR34
ASN45
MET63
ASN66
GLY67
GLY7
ILE70
MET9
THR99
C Pocket

ILE70
VAL73
GLU74
MET9
THR97
D Pocket

PRO114
VAL155
SER156
GLY159
LEU160
THR99
E Pocket

PRO114
SER147
GLU152
SER156
THR97
F Pocket

THR116
MET123
SER143
HIS146
SER147
ASP77
PHE80
SER81
TRP84
THR95

Colour key

Binds N-terminus Binds P1 backbone Binds P2 backbone Binds PC-1 backbone Binds C-terminus

Data provenance

N-/C-terminus and peptide backbone binding residues are assigned according to previously published information and pockets are assigned according to an adaptation of a previously published set of residues. All numbering is currently that of the 'canonical' structures of human and mouse MHC Class I molecules.

Chain sequences

1. Class I alpha
H2-Db
        10        20        30        40        50        60
TAPDNLGYMGGGGSGGGGSGGGGSIQKTPQIQVYSRHPPENGKPNILNCYVTQFHPPHIE
        70        80        90       100       110       120
IQMLKNGKKIPKVEMSDMSFSKDWSFYILAHTEFTPTETDTYACRVKHASMAEPKTVYWD
       130       140       150       160       170       180
RDMGGGGSGGGGSGGGGSGGGGSGPHSMRYFETAVSRPGLEEPRYISVGYVDNKEFVRFD
       190       200       210       220       230       240
SDAENPRYEPRAPWMEQEGPEYWERETQKAKGQEQWFRVSLRNLLGAYNQSAGGSHTLQQ
       250       260       270       280       290       300
MSGCDLGSDWRLLRGYLQFAYEGRDYIALNEDLKTWTAADMAAQITRRKWEQSGAAEHYK
       310       320       330       340       350       360
AYLEGECVEWLHRYLKNGNATLLRTDSPKAHVTHHPRSKGEVTLRCWALGFYPADITLTW
       370       380       390       400       410       420
QLNGEELTQDMELVETRPAGDGTFQKWASVVVPLGKEQNYTCRVYHEGLPEPLTLRWEPA
       430       440
AAGGGLNDIFEAQKIEWHEHHHHHHHH


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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or in the case of JSON formatted files to retrieve it and use it as part of notebooks such as Jupyter or GoogleColab.
Please take note of the data license. Using data from this site assumes that you have read and will comply with the license.

Complete structures

Aligned structures [cif]
  1. 6MP0 assembly 1  

Components

MHC Class I alpha chain [cif]
  1. 6MP0 assembly 1  
MHC Class I antigen binding domain (alpha1/alpha2) [cif]
  1. 6MP0 assembly 1  

Derived data

Data for this page [json]
https://api.histo.fyi/v1/structures/6mp0

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