1IIE

HLA-DR ANTIGENS ASSOCIATED INVARIANT CHAIN


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 80 
  • Conformers Submitted: 20 
  • Selection Criteria: LEAST RESTRAINT VIOLATION, GOOD GEOMETRY 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of a trimeric domain of the MHC class II-associated chaperonin and targeting protein Ii.

Jasanoff, A.Wagner, G.Wiley, D.C.

(1998) EMBO J. 17: 6812-6818

  • DOI: 10.1093/emboj/17.23.6812

  • PubMed Abstract: 
  • The invariant chain (Ii) plays a critical role in MHC class II antigen processing by stabilizing peptide-free class II alphabeta heterodimers in a nonameric (alphabetaIi)3 complex soon after their synthesis and directing transport of the complex from ...

    The invariant chain (Ii) plays a critical role in MHC class II antigen processing by stabilizing peptide-free class II alphabeta heterodimers in a nonameric (alphabetaIi)3 complex soon after their synthesis and directing transport of the complex from the endoplasmic reticulum to compartments where peptide loading of class II takes place. Loading progresses following Ii proteolysis and via an intermediate complex of MHC class II with an Ii-derived peptide, CLIP. CLIP is substituted by exogenous peptidic fragments in an exchange reaction catalyzed by HLA-DM. The CLIP region of Ii, roughly residues 81-104, is one of two segments shown to interact with class II HLA-DR molecules. The other segment, Ii 118-216, is C-terminal to CLIP, mediates trimerization of the ectodomain of Ii and interferes with DM/class II binding. Here we report the three-dimensional structure of this trimeric domain, determined by nuclear magnetic resonance (NMR) studies of a 27 kDa trimer of human Ii 118-192. The cylindrical shape of the molecule and the mapping of conserved residues delimit surfaces which may be important for interactions between Ii and class II molecules.


    Related Citations: 
    • Invariant Chain Made in Escherichia coli Has an Exposed N-Terminal Segment that Blocks Antigen Binding to HLA-DR1 and a Trimeric C-Terminal Segment that Binds Empty HLA-DR1
      Park, S.-J.,Sadegh-Nasseri, S.,Wiley, D.C.
      (1995) Proc.Natl.Acad.Sci.USA 92: 11289
    • An Asymmetric Deuterium Labeling Strategy to Identify Interprotomer and Intraprotomer Noes in Oligomeric Proteins
      Jasanoff, A.
      (1998) J.Biomol.NMR 12: 299


    Organizational Affiliation

    Department of Molecular and Cellular Biology, Harvard Medical School, Cambridge, MA 02138, USA. jasanoff@crystal.harvard.edu




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (HLA-DR ANTIGENS ASSOCIATED INVARIANT CHAIN)
A, B, C
75Homo sapiensGene Names: CD74 (DHLAG)
Find proteins for P04233 (Homo sapiens)
Go to Gene View: CD74
Go to UniProtKB:  P04233
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 80 
  • Conformers Submitted: 20 
  • Selection Criteria: LEAST RESTRAINT VIOLATION, GOOD GEOMETRY 
  • Olderado: 1IIE Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-02-16
    Type: Initial release
  • Version 1.1: 2008-04-26
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance