1SJH

HLA-DR1 complexed with a 13 residue HIV capsid peptide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.220 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

A hairpin turn in a class II MHC-bound peptide orients residues outside the binding groove for T cell recognition.

Zavala-Ruiz, Z.Strug, I.Walker, B.D.Norris, P.J.Stern, L.J.

(2004) Proc.Natl.Acad.Sci.Usa 101: 13279-13284

  • DOI: 10.1073/pnas.0403371101
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • T cells generally recognize peptide antigens bound to MHC proteins through contacts with residues found within or immediately flanking the seven- to nine-residue sequence accommodated in the MHC peptide-binding groove. However, some T cells require p ...

    T cells generally recognize peptide antigens bound to MHC proteins through contacts with residues found within or immediately flanking the seven- to nine-residue sequence accommodated in the MHC peptide-binding groove. However, some T cells require peptide residues outside this region for activation, the structural basis for which is unknown. Here, we have investigated a HIV Gag-specific T cell clone that requires an unusually long peptide antigen for activation. The crystal structure of a minimally antigenic 16-mer bound to HLA-DR1 shows that the peptide C-terminal region bends sharply into a hairpin turn as it exits the binding site, orienting peptide residues outside the MHC-binding region in position to interact with a T cell receptor. Peptide truncation and substitution studies show that both the hairpin turn and the extreme C-terminal residues are required for T cell activation. These results demonstrate a previously unrecognized mode of MHC-peptide-T cell receptor interaction.


    Organizational Affiliation

    Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
HLA class II histocompatibility antigen, DR alpha chain
A
180Homo sapiensMutation(s): 0 
Gene Names: HLA-DRA (HLA-DRA1)
Find proteins for P01903 (Homo sapiens)
Go to Gene View: HLA-DRA
Go to UniProtKB:  P01903
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
HLA class II histocompatibility antigen, DRB1-1 beta chain
B
190Homo sapiensMutation(s): 0 
Gene Names: HLA-DRB1
Find proteins for P04229 (Homo sapiens)
Go to Gene View: HLA-DRB1
Go to UniProtKB:  P04229
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
GAG polyprotein
C
13Human immunodeficiency virus type 1 group M subtype DMutation(s): 0 
Gene Names: gag
Find proteins for P12495 (Human immunodeficiency virus type 1 group M subtype D)
Go to UniProtKB:  P12495
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
Enterotoxin type C-3
D
239Staphylococcus aureusMutation(s): 4 
Gene Names: entC3
Find proteins for P0A0L5 (Staphylococcus aureus)
Go to UniProtKB:  P0A0L5
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.220 
  • Space Group: H 3
Unit Cell:
Length (Å)Angle (°)
a = 172.464α = 90.00
b = 172.464β = 90.00
c = 121.461γ = 120.00
Software Package:
Software NamePurpose
AMoREphasing
CNSrefinement
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-08-17
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-10-11
    Type: Refinement description
  • Version 1.4: 2018-04-04
    Type: Data collection