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2VE6

H2-Db binding "FAPGNYXAL" at 2.65Å 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

Class i with peptide

1. Beta 2 microglobulin
['B', 'E', 'H', 'K']
2. Class I alpha
H2-Db
['A', 'D', 'G', 'J']
3. Peptide
FAPGNYXAL
['C', 'F', 'I', 'L']

Species


Locus / Allele group


Publication

Discovery of CD8+ T cell epitopes in Chlamydia trachomatis infection through use of caged class I MHC tetramers.

Grotenbreg GM, Roan NR, Guillen E, Meijers R, Wang JH, Bell GW, Starnbach MN, Ploegh HL
Proc. Natl. Acad. Sci. U.S.A. (2008) 105, 3831-6 [doi:10.1073/pnas.0711504105]  [pubmed:18245382

Class I MHC tetramers allow direct phenotypic identification of CD8(+) T cell populations, but their production remains laborious. A peptide exchange strategy that employs class I MHC products loaded with conditional ligands (caged MHC molecules) provides a fast and straightforward method to obtain diverse arrays of class I MHC tetramers and facilitates CD8(+) T cell epitope discovery. Here, we describe the development of photocleavable analogs of the FAPGNYPAL (SV9) epitope that bind H-2K(b) and H-2D(b) with full retention of their structural and functional integrity. We ranked all possible H-2K(b) octameric and H-2D(b) nonameric epitopes that span the genome of Chlamydia trachomatis and prepared MHC tetramers from approximately 2,000 of the highest scoring peptides by replacement of the SV9 analog with the peptide of choice. The resulting 2,000-member class I MHC tetramer array allowed the discovery of two variants of an epitope derived from polymorphic membrane protein I (PmpI) and an assessment of the kinetics of emergence and the effector function of the corresponding CD8(+) T cells.

Structure deposition and release

Deposited: 2007-10-17
Released: 2008-01-22
Revised: 2019-05-15

Data provenance

Publication data retrieved from PDBe REST API8 and PMCe REST API9

Other structures from this publication


Peptide details

Length: Nonamer (9 amino acids)

Sequence: FAPGNYXAL

Interactive view
Cutaway side view (static)
Surface top view (static - coloured by atom property)
Cutaway top view (static)

Data provenance

MHC:peptide complexes are visualised using PyMol. The peptide is superimposed on a consistent cutaway slice of the MHC binding cleft (displayed as a grey mesh) which best indicates the binding pockets for the P1/P5/PC positions (side view - pockets A, E, F) and for the P2/P3/PC-2 positions (top view - pockets B, C, D). In some cases peptides will use a different pocket for a specific peptide position (atypical anchoring). On some structures the peptide may appear to sterically clash with a pocket. This is an artefact of picking a standardised slice of the cleft and overlaying the peptide.


Peptide neighbours

P1 PHE

GLU63
LYS66
MET5
TRP167
PHE33
TYR171
TYR159
TYR59
TYR7
GLU163
P2 ALA

TYR159
TYR7
GLU63
LYS66
TYR45
P3 PRO

GLN97
TYR159
GLU9
LYS66
TYR7
GLN70
SER99
P4 GLY

GLN70
LYS66
TYR156
HIS155
P5 ASN

PHE116
HIS155
GLN97
TRP73
TYR156
GLN70
PHE74
P6 TYR

TRP147
ALA152
TYR156
HIS155
SER150
TRP73
P8 ALA

ASN80
SER77
LYS146
VAL76
TRP73
TRP147
P9 LEU

TRP147
ASN80
LEU81
LEU95
SER77
THR143
LYS146
TYR84
TYR123
PHE116
TRP73

Colour key

Aromatic Hydrophobic Acidic Basic Neutral/polar

Data provenance

Neighbours are calculated by finding residues with atoms within 5Å of each other using BioPython Neighboursearch module. The list of neighbours is then sorted and filtered to inlcude only neighbours where between the peptide and the MHC Class I alpha chain.

Colours selected to match the YRB scheme. [https://www.frontiersin.org/articles/10.3389/fmolb.2015.00056/full]


Binding cleft pockets


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

TYR159
GLU163
TRP167
TYR171
MET5
TYR59
GLU63
LYS66
TYR7
B Pocket

SER24
VAL34
TYR45
GLU63
LYS66
ALA67
TYR7
GLN70
GLU9
SER99
C Pocket

GLN70
TRP73
PHE74
GLU9
GLN97
D Pocket

LEU114
HIS155
TYR156
TYR159
LEU160
SER99
E Pocket

LEU114
TRP147
ALA152
TYR156
GLN97
F Pocket

PHE116
TYR123
THR143
LYS146
TRP147
SER77
ASN80
LEU81
TYR84
LEU95

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. Beta 2 microglobulin
Beta 2 microglobulin
        10        20        30        40        50        60
MQKTPQIQVYSRHPPENGKPNILNCYVTQFHPPHIEIQMLKNGKKIPKVEMSDMSFSKDW
        70        80        90
SFYILAHTEFTPTETDTYACRVKHASMAEPKTVYWDRDM

2. Class I alpha
H2-Db
        10        20        30        40        50        60
GPHSMRYFETAVSRPGLEEPRYISVGYVDNKEFVRFDSDAENPRYEPRAPWMEQEGPEYW
        70        80        90       100       110       120
ERETQKAKGQEQWFRVSLRNLLGYYNQSAGGSHTLQQMSGCDLGSDWRLLRGYLQFAYEG
       130       140       150       160       170       180
RDYIALNEDLKTWTAADMAAQITRRKWEQSGAAEHYKAYLEGECVEWLHRYLKNGNATLL
       190       200       210       220       230       240
RTDSPKAHVTHHPRSKGEVTLRCWALGFYPADITLTWQLNGEELTQDMELVETRPAGDGT
       250       260       270
FQKWASVVVPLGKEQNYTCRVYHEGLPEPLTLRWEPP

3. Peptide
FAPGNYXAL


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

Data can be downloaded to your local machine from the links below.
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   e.g. load http://www.histo.fyi/structures/downloads/1hhk_1_peptide.cif
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. 2VE6 assembly 1  
  2. 2VE6 assembly 2  
  3. 2VE6 assembly 3  
  4. 2VE6 assembly 4  

Components

MHC Class I alpha chain [cif]
  1. 2VE6 assembly 1  
  2. 2VE6 assembly 2  
  3. 2VE6 assembly 3  
  4. 2VE6 assembly 4  
MHC Class I antigen binding domain (alpha1/alpha2) [cif]
  1. 2VE6 assembly 1  
  2. 2VE6 assembly 2  
  3. 2VE6 assembly 3  
  4. 2VE6 assembly 4  
Peptide only [cif]
  1. 2VE6 assembly 1  
  2. 2VE6 assembly 2  
  3. 2VE6 assembly 3  
  4. 2VE6 assembly 4  

Derived data

Data for this page [json]
https://api.histo.fyi/v1/structures/2ve6

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