1FNL | pdb_00001fnl

CRYSTAL STRUCTURE OF THE EXTRACELLULAR DOMAIN OF A HUMAN FCGRIII

• PDB DOI: https://doi.org/10.2210/pdb1FNL/pdb

• Classification: IMMUNE SYSTEM RECEPTOR
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2000-08-22 Released: 2000-11-22 
• Deposition Author(s): Zhang, Y., Boesen, C.C., Radaev, S., Brooks, A.G., Fridman, W.H., Sautes-Fridman, C., Sun, P.D.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free: 
  0.216 (Depositor) 
• R-Value Work: 
  0.184 (Depositor) 

Literature

Crystal structure of the extracellular domain of a human Fc gamma RIII.

Zhang, Y., Boesen, C.C., Radaev, S., Brooks, A.G., Fridman, W.H., Sautes-Fridman, C., Sun, P.D.

(2000) Immunity 13: 387-395

• PubMed: 11021536 
• DOI: https://doi.org/10.1016/s1074-7613(00)00038-8
• Primary Citation Related Structures: 
  1FNL


• PubMed Abstract: 
  

  Fc receptors play a major role in immune defenses against pathogens and in inflammatory processes. The crystal structure of a human immunoglobulin receptor, FcgammaRIIIb, has been determined to 1.8 A resolution. The overall fold consists of two immunoglobulin-like domains with an acute interdomain hinge angle of approximately 50 degrees. Trp-113, wedged between the N-terminal D1 and the C-terminal D2 domains, appears to further restrict the hinge angle. The putative Fc binding region of the receptor carries a net positive charge complementary to the negative-charged receptor binding regions on Fc. A 1:1 binding stoichiometry between the receptor and Fc was measured by both the equilibrium and nonequilibrium size-exclusion chromatography. Two separate parallel dimers are observed in the crystal lattice, offering intriguing models for receptor aggregation.

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Organizational Affiliation: 
• Department of Human Biological Chemistry and Genetics, University of Texas Medical Branch, Galveston 77555, USA.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 20.41 kDa 
• Atom Count: 1,616 
• Modeled Residue Count: 173 
• Deposited Residue Count: 175 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
LOW AFFINITY IMMUNOGLOBULIN GAMMA FC REGION RECEPTOR III-B	A	175	Homo sapiens	Mutation(s): 0
UniProt & NIH Common Fund Data Resources
Find proteins for O75015 (Homo sapiens) Explore O75015  Go to UniProtKB:  O75015
PHAROS:  O75015 GTEx:  ENSG00000162747

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
HG	B [auth A], C [auth A]	MERCURY (II) ION Hg BQPIGGFYSBELGY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free:  0.216 (Depositor) 
• R-Value Work:  0.184 (Depositor) 

Space Group: P 2₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 67.427	α = 90
b = 85.733	β = 90
c = 36.33	γ = 90

Software Package:

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

Structure Validation

Entry History 

Deposition Data

• Released Date: 2000-11-22 
Deposition Author(s): Zhang, Y., Boesen, C.C., Radaev, S., Brooks, A.G., Fridman, W.H., Sautes-Fridman, C., Sun, P.D.

Revision History  

• Version 1.0: 2000-11-22
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2024-10-30
  Changes: Data collection, Database references, Derived calculations, Structure summary