11CW | pdb_000011cw

Crystal structure of mouse IgG2a Fc in complex with mouse Fc gamma receptor IV

• PDB DOI: https://doi.org/10.2210/pdb11CW/pdb

• Classification: IMMUNE SYSTEM
• Organism(s): Mus musculus
• Expression System: Homo sapiens
• Mutation(s): No 


• Deposited: 2026-02-17 Released: 2026-11-11 
• Deposition Author(s): Mo, G., Yan, Z.
• Funding Organization(s): National Institutes of Health/National Cancer Institute (NIH/NCI)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.16 Å
• R-Value Free: 
  0.272 (Depositor), 0.271 (DCC) 
• R-Value Work: 
  0.226 (Depositor), 0.226 (DCC) 
• R-Value Observed: 
  0.231 (Depositor) 

Starting Models: experimental

Literature

Filling the gap between human IgG1-Fc binding with hFc gamma Receptor IIIA and mFc gamma Receptor IV

Mo, G., Yan, Z.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 3-mer - A2B1 Local Symmetry: Cyclic - C2  (Explore in 3D)
Local Stoichiometry: Homo 2-mer - A2 

Local Symmetry: Cyclic - C2  (Explore in 3D)
Local Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: gel filtration

Macromolecule Content 

• Total Structure Weight: 84.85 kDa 
• Atom Count: 4,897 
• Modeled Residue Count: 578 
• Deposited Residue Count: 715 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Ig gamma-2A chain C region, A allele	A, B	233	Mus musculus	Mutation(s): 0  Gene Names: Ighg
UniProt
Find proteins for P01863 (Mus musculus) Explore P01863  Go to UniProtKB:  P01863
Glycosylation
Glycosylation Sites: 1		Go to GlyGen: P01863-1

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Low affinity immunoglobulin gamma Fc region receptor III-A	C	249	Mus musculus	Mutation(s): 0  Gene Names: Fcgr4, Fcgr3a
UniProt
Find proteins for A0A0B4J1G0 (Mus musculus) Explore A0A0B4J1G0  Go to UniProtKB:  A0A0B4J1G0
Glycosylation
Glycosylation Sites: 2		Go to GlyGen: A0A0B4J1G0-1

Oligosaccharides

Help  

Entity ID: 3
Molecule	Chains	Length	2D Diagram	Glycosylation	D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-[2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-alpha-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranose	D, E	8		N-Glycosylation

Entity ID: 4
Molecule	Chains	Length	2D Diagram	Glycosylation	D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose	F	2		N-Glycosylation

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
NAG (Subject of Investigation/LOI)	G [auth C]	2-acetamido-2-deoxy-beta-D-glucopyranose C8 H15 N O6 OVRNDRQMDRJTHS-FMDGEEDCSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.16 Å
• R-Value Free:  0.272 (Depositor), 0.271 (DCC) 
• R-Value Work:  0.226 (Depositor), 0.226 (DCC) 
• R-Value Observed: 0.231 (Depositor) 

Space Group: C 2 2 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 113.754	α = 90
b = 185.055	β = 90
c = 93.734	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
xia2	data scaling
xia2	data reduction
PHASER	phasing

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2026-11-11 
Deposition Author(s): Mo, G., Yan, Z.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Cancer Institute (NIH/NCI)	United States	R01CA281106

Revision History  

• Version 1.0: 2026-11-11
  Type: Initial release