1EXU

CRYSTAL STRUCTURE OF THE HUMAN MHC-RELATED FC RECEPTOR


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.197 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure and immunoglobulin G binding properties of the human major histocompatibility complex-related Fc receptor(,).

West Jr., A.P.Bjorkman, P.J.

(2000) Biochemistry 39: 9698-9708


  • PubMed Abstract: 
  • The neonatal Fc receptor (FcRn) performs two distinct but related functions: transport of maternal immunoglobulin G (IgG) to pre- or neonatal mammals, thus providing passive immunity, and protection of IgG from normal serum protein catabolism. FcRn i ...

    The neonatal Fc receptor (FcRn) performs two distinct but related functions: transport of maternal immunoglobulin G (IgG) to pre- or neonatal mammals, thus providing passive immunity, and protection of IgG from normal serum protein catabolism. FcRn is related to class I MHC proteins but lacks a functional peptide binding groove. The crystal structure of human FcRn has been determined at 2.7 A resolution and compared to the previously described structure of rat FcRn [Burmeister et al. (1994) Nature 372, 336-343] and to the structures of MHC and MHC-related proteins. Human FcRn is structurally similar to the rat receptor but does not form receptor dimers in the crystals as observed in crystals of rat FcRn. The interaction between human FcRn and IgG was characterized by determining the binding stoichiometry using equilibrium gel filtration and by deriving binding affinities for the different human IgG subclasses using a surface plasmon resonance assay. Like rat and mouse FcRn, human FcRn interacts with IgG with a 2:1 receptor:ligand stoichiometry. The binding of human FcRn to the four human IgG subclasses shows subclass and allotype variations but no clear subclass affinity differences that correlate with serum half-lives. The structure of human FcRn and studies of its ligand binding are relevant to current efforts to use FcRn-mediated regulation of IgG half-life in serum to increase the lifetimes of antibody-based therapeutics.


    Organizational Affiliation

    Division of Biology 156-29 and Howard Hughes Medical Institute, California Institute of Technology, Pasadena, California 91125, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
IGG RECEPTOR FCRN LARGE SUBUNIT P51
A
267Homo sapiensMutation(s): 0 
Gene Names: FCGRT (FCRN)
Find proteins for P55899 (Homo sapiens)
Go to Gene View: FCGRT
Go to UniProtKB:  P55899
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
BETA-2-MICROGLOBULIN
B
99Homo sapiensMutation(s): 0 
Gene Names: B2M
Find proteins for P61769 (Homo sapiens)
Go to Gene View: B2M
Go to UniProtKB:  P61769
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
BME
Query on BME

Download SDF File 
Download CCD File 
A
BETA-MERCAPTOETHANOL
C2 H6 O S
DGVVWUTYPXICAM-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.197 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 66.387α = 90.00
b = 66.387β = 90.00
c = 221.813γ = 90.00
Software Package:
Software NamePurpose
X-PLORrefinement
AMoREphasing
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2000-08-10
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance