2IPK

Crystal Structure of the MHC Class II Molecule HLA-DR1 in Complex with the Fluorogenic Peptide, AcPKXVKQNTLKLAT (X=3-[5-(dimethylamino)-1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl]-L-alanine) and the Superantigen, SEC3 Variant 3B2


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.203 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Fluorogenic probes for monitoring peptide binding to class II MHC proteins in living cells.

Venkatraman, P.Nguyen, T.T.Sainlos, M.Bilsel, O.Chitta, S.Imperiali, B.Stern, L.J.

(2007) Nat.Chem.Biol. 3: 222-228

  • DOI: 10.1038/nchembio868

  • PubMed Abstract: 
  • A crucial step in the immune response is the binding of antigenic peptides to major histocompatibility complex (MHC) proteins. Class II MHC proteins present their bound peptides to CD4(+) T cells, thereby helping to activate both the humoral and the ...

    A crucial step in the immune response is the binding of antigenic peptides to major histocompatibility complex (MHC) proteins. Class II MHC proteins present their bound peptides to CD4(+) T cells, thereby helping to activate both the humoral and the cellular arms of the adaptive immune response. Peptide loading onto class II MHC proteins is regulated temporally, spatially and developmentally in antigen-presenting cells. To help visualize these processes, we have developed a series of novel fluorogenic probes that incorporate the environment-sensitive amino acid analogs 6-N,N-dimethylamino-2-3-naphthalimidoalanine and 4-N,N-dimethylaminophthalimidoalanine. Upon binding to class II MHC proteins these fluorophores show large changes in emission spectra, quantum yield and fluorescence lifetime. Peptides incorporating these fluorophores bind specifically to class II MHC proteins on antigen-presenting cells and can be used to follow peptide binding in vivo. Using these probes we have tracked a developmentally regulated cell-surface peptide-binding activity in primary human monocyte-derived dendritic cells.


    Organizational Affiliation

    Department of Pathology, University of Massachusetts Medical School, 55 Lake Ave. North, Worcester, Massachusetts 01655, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
HLA class II histocompatibility antigen, DR alpha chain
A
183Homo sapiensGene 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 sapiensGene Names: HLA-DRB1
Find proteins for P04229 (Homo sapiens)
Go to Gene View: HLA-DRB1
Go to UniProtKB:  P04229
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
HA related Fluorogenic Peptide, AcPKXVKQNTLKLAT (X=3-[5-(dimethylamino)-1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl]-L-alanine)
C
14Influenza A virus (A/mallard/Sweden/S90391/2005(H3N8))N/A
Find proteins for A8CDU0 (Influenza A virus (A/mallard/Sweden/S90391/2005(H3N8)))
Go to UniProtKB:  A8CDU0
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
Enterotoxin type C-3
D
240Staphylococcus aureusGene Names: entC3
Find proteins for P0A0L5 (Staphylococcus aureus)
Go to UniProtKB:  P0A0L5
Small Molecules
Modified Residues  2 Unique
IDChainsTypeFormula2D DiagramParent
4DP
Query on 4DP
C
L-PEPTIDE LINKINGC13 H15 N3 O4TRP
ACE
Query on ACE
C
NON-POLYMERC2 H4 O

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.203 
  • Space Group: H 3
Unit Cell:
Length (Å)Angle (°)
a = 171.980α = 90.00
b = 171.980β = 90.00
c = 121.129γ = 120.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
DENZOdata reduction
HKL-3000data scaling
HKL-3000data collection
HKL-3000data reduction
CNSrefinement
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-03-13
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-10-18
    Type: Refinement description, Source and taxonomy