1LNU

CRYSTAL STRUCTURE OF CLASS II MHC MOLECULE IAb BOUND TO EALPHA3K PEPTIDE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.211 

wwPDB Validation   3D Report Full Report


Ligand Structure Quality Assessment 


This is version 2.0 of the entry. See complete history


Literature

Alternate interactions define the binding of peptides to the MHC molecule IA(b).

Liu, X.Dai, S.Crawford, F.Fruge, R.Marrack, P.Kappler, J.

(2002) Proc Natl Acad Sci U S A 99: 8820-8825

  • DOI: 10.1073/pnas.132272099
  • Primary Citation of Related Structures:  
    1LNU

  • PubMed Abstract: 
  • We have solved the crystal structure of the MHCII molecule, IA(b), containing an antigenic variant of the major IA(b)-binding peptide derived from the MHCII IEalpha chain. The four MHC pockets at p1, p4, p6, and p9 that usually bind peptide side chains are largely empty because of alanines in the peptide at these positions ...

    We have solved the crystal structure of the MHCII molecule, IA(b), containing an antigenic variant of the major IA(b)-binding peptide derived from the MHCII IEalpha chain. The four MHC pockets at p1, p4, p6, and p9 that usually bind peptide side chains are largely empty because of alanines in the peptide at these positions. The complex is nevertheless very stable, apparently because of unique alternate interactions between the IA(b) and peptide. In particular, there are multiple additional hydrogen bonds between the N-terminal end of the peptide and the IA(b) alpha chain and an extensive hydrogen bond network involving an asparagine at p7 position of the peptide and the IA(b) beta chain. By using knowledge of the shape and size of the traditional side chain binding pockets and the additional possible interactions, an IA(b) peptide-binding motif can be deduced that agrees well with the sequences of known IA(b)-binding peptides.


    Organizational Affiliation

    Integrated Department of Immunology, Zuckerman Family/Canyon Ranch Crystallography Laboratory, Howard Hughes Medical Institute, National Jewish Medical and Research Center, 1400 Jackson Street, Denver, CO 80206, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
H-2 class II histocompatibility antigen, A-B alpha chainA, C, E, G182Mus musculusMutation(s): 0 
Gene Names: H2-Aa
UniProt
Find proteins for P14434 (Mus musculus)
Explore P14434 
Go to UniProtKB:  P14434
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
H-2 class II histocompatibility antigen, A beta chainB, D, F, H217Mus musculusMutation(s): 0 
Gene Names: H2-Ab1H2-iabeta
UniProt
Find proteins for P14483 (Mus musculus)
Explore P14483 
Go to UniProtKB:  P14483
Protein Feature View
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.211 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 65.04α = 90
b = 274.18β = 111.42
c = 65.12γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
SCALEPACKdata scaling
AMoREphasing
CNSrefinement
HKL-2000data reduction

Structure Validation

View Full Validation Report



Ligand Structure Quality Assessment  



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-08-14
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Database references, Derived calculations, Non-polymer description, Structure summary