1EXU

CRYSTAL STRUCTURE OF THE HUMAN MHC-RELATED FC RECEPTOR


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.197 

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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

  • DOI: 10.1021/bi000749m
  • Primary Citation of Related Structures:  
    1EXU

  • 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 is related to class I MHC proteins but lacks a functional peptide binding groove ...

    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
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
IGG RECEPTOR FCRN LARGE SUBUNIT P51A267Homo sapiensMutation(s): 0 
Gene Names: FCGRTFCRN
Find proteins for P55899 (Homo sapiens)
Explore P55899 
Go to UniProtKB:  P55899
NIH Common Fund Data Resources
PHAROS  P55899
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
BETA-2-MICROGLOBULINB99Homo sapiensMutation(s): 0 
Gene Names: B2MCDABP0092HDCMA22P
Find proteins for P61769 (Homo sapiens)
Explore P61769 
Go to UniProtKB:  P61769
NIH Common Fund Data Resources
PHAROS  P61769
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
BME
Query on BME

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

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 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
b = 66.387β = 90
c = 221.813γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing
X-PLORrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

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