Biological Assembly 1  

 3D View: Structure | Ligand Interaction

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Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 3-mer - A2B 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 77677.14 
• Atom Count: 5251 
• Residue Count: 620 
• Unique protein chains: 2

1F6A

Structure of the human ige-fc bound to its high affinity receptor fc(epsilon)ri(alpha)

• DOI: 10.2210/pdb1F6A/pdb

• Classification: IMMUNE SYSTEM
• Organism(s): Homo sapiens
• Expression System: HI-5 INSECT CELLS
• Mutation(s): 3 


• Deposited: 2000-06-20 Released: 2000-07-20 
• Deposition Author(s): Garman, S.C., Wurzburg, B.A., Tarchevskaya, S.S., Kinet, J.P., Jardetzky, T.S.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.5 Å
• R-Value Free: 0.273 
• R-Value Work: 0.254 

Literature

Structure of the Fc fragment of human IgE bound to its high-affinity receptor Fc (epsilon) RI (alpha).

Garman, S.C., Wurzburg, B.A., Tarchevskaya, S.S., Kinet, J.P., Jardetzky, T.S.

(2000) Nature 406: 259-266

• PubMed: 10917520 
• DOI: 10.1038/35018500


• PubMed Abstract: 
  

The initiation of immunoglobulin-E (IgE)-mediated allergic responses requires the binding of IgE antibody to its high-affinity receptor, Fc epsilonRI. Crosslinking of Fc epsilonRI initiates an intracellular signal transduction cascade that triggers the release of mediators of the allergic response. The interaction of the crystallizable fragment (Fc) of IgE (IgE-Fc) with Fc epsilonRI is a key recognition event of this process and involves the extracellular domains of the Fc epsilonRI alpha-chain. To understand the structural basis for this interaction, we have solved the crystal structure of the human IgE-Fc-Fc epsilonRI alpha complex to 3.5-A resolution. The crystal structure reveals that one receptor binds one dimeric IgE-Fc molecule asymmetrically through interactions at two sites, each involving one C epsilon3 domain of the IgE-Fc. The interaction of one receptor with the IgE-Fc blocks the binding of a second receptor, and features of this interaction are conserved in other members of the Fc receptor family. The structure suggests new approaches to inhibiting the binding of IgE to Fc epsilonRI for the treatment of allergy and asthma.

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Organizational Affiliation: 

Department of Biochemistry, Molecular Biology and Cell Biology, Northwestern University, Evanston, Illinois 60208, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
HIGH AFFINITY IMMUNOGLOBULIN EPSILON RECEPTOR ALPHA-SUBUNIT	A	176	Homo sapiens	Mutation(s): 3  Gene Names: FCER1A (FCE1A)
Find proteins for P12319 (Homo sapiens) Go to Gene View: FCER1A Go to UniProtKB:  P12319

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
IG EPSILON CHAIN C REGION	B, D	222	Homo sapiens	Mutation(s): 0  Gene Names: IGHE
Find proteins for P01854 (Homo sapiens) Go to UniProtKB:  P01854

Small Molecules

Ligands 5 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
SO4	A, B, D	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
MAN	A, B, D	ALPHA-D-MANNOSE C6 H12 O6 WQZGKKKJIJFFOK-PQMKYFCFSA-N
FUC	A	ALPHA-L-FUCOSE C6 H12 O5 SHZGCJCMOBCMKK-SXUWKVJYSA-N
NAG	A, B, D	N-ACETYL-D-GLUCOSAMINE C8 H15 N O6 OVRNDRQMDRJTHS-FMDGEEDCSA-N
CPS	A, D	3-[(3-CHOLAMIDOPROPYL)DIMETHYLAMMONIO]-1-PROPANESULFONATE CHAPS C32 H58 N2 O7 S UMCMPZBLKLEWAF-BCTGSCMUSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.5 Å
• R-Value Free: 0.273 
• R-Value Work: 0.254 
• Space Group: H 3 2

Unit Cell:

Length (Å)	Angle (°)
a = 192.800	α = 90.00
b = 192.800	β = 90.00
c = 302.400	γ = 120.00

Software Package:

Software Name	Purpose
SCALEPACK	data scaling
AMoRE	phasing
DENZO	data reduction
CNS	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2000-06-20 
• Released Date: 2000-07-20 
• Deposition Author(s): Garman, S.C., Wurzburg, B.A., Tarchevskaya, S.S., Kinet, J.P., Jardetzky, T.S.

Revision History 

• Version 1.0: 2000-07-20
  Type: Initial release
• Version 1.1: 2008-04-27
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Non-polymer description, Version format compliance