Biological Assembly 1  

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

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

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 75.84 kDa 
• Atom Count: 5,379 
• Modelled Residue Count: 591 
• Deposited Residue Count: 625 
• Unique protein chains: 2

 3AY4

Crystal structure of nonfucosylated Fc complexed with bis-glycosylated soluble form of Fc gamma receptor IIIa

• PDB DOI: 10.2210/pdb3AY4/pdb

• Classification: IMMUNE SYSTEM
• Organism(s): Homo sapiens
• Expression System: Cricetulus griseus
• Mutation(s): Yes 


• Deposited: 2011-04-28 Released: 2011-08-03 
• Deposition Author(s): Mizushima, T., Takemoto, E., Yagi, H., Shibata-Koyama, M., Isoda, Y., Iida, S., Satoh, M., Kato, K.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.263 
• R-Value Work: 0.223 
• R-Value Observed: 0.225 

Literature

Structural basis for improved efficacy of therapeutic antibodies on defucosylation of their Fc glycans

Mizushima, T., Yagi, H., Takemoto, E., Shibata-Koyama, M., Isoda, Y., Iida, S., Masuda, K., Satoh, M., Kato, K.

(2011) Genes Cells 16: 1071-1080

• PubMed: 22023369 
• DOI: 10.1111/j.1365-2443.2011.01552.x
• Primary Citation of Related Structures:  
  3AY4


• PubMed Abstract: 
  

Removal of the fucose residue from the N-glycans of the Fc portion of immunoglobulin G (IgG) results in a dramatic enhancement of antibody-dependent cellular cytotoxicity (ADCC) through improved affinity for Fcγ receptor IIIa (FcγRIIIa). Here, we present the 2.2-Å structure of the complex formed between nonfucosylated IgG1-Fc and a soluble form of FcγRIIIa (sFcγRIIIa) with two N-glycosylation sites. The crystal structure shows that one of the two N-glycans of sFcγRIIIa mediates the interaction with nonfucosylated Fc, thereby stabilizing the complex. However, fucosylation of the Fc N-glycans inhibits this interaction, because of steric hindrance, and furthermore, negatively affects the dynamics of the receptor binding site. Our results offer a structural basis for improvement in ADCC of therapeutic antibodies by defucosylation.

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Organizational Affiliation: 

Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-dori, Mizuho-ku, Nagoya 467-8603, Japan.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Ig gamma-1 chain C region	A, B	223	Homo sapiens	Mutation(s): 0  Gene Names: IGHG1
UniProt & NIH Common Fund Data Resources
Find proteins for P01857 (Homo sapiens) Explore P01857  Go to UniProtKB:  P01857
PHAROS:  P01857

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Low affinity immunoglobulin gamma Fc region receptor III-A	C	179	Homo sapiens	Mutation(s): 3  Gene Names: FCGR3A, CD16A, FCG3, FCGR3, IGFR3
UniProt & NIH Common Fund Data Resources
Find proteins for P08637 (Homo sapiens) Explore P08637  Go to UniProtKB:  P08637
PHAROS:  P08637

Oligosaccharides

Help

Entity ID: 3
Molecule	Chains	Chain Length	2D Diagram	Glycosylation
beta-D-galactopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-alpha-D-mannopyranose-(1-6)-[2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-alpha-D-mannopyranose-(1-3)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose	D, E	8		N-Glycosylation
Glycosylation Resources
GlyTouCan:  G89993FE GlyCosmos:  G89993FE GlyGen:  G89993FE

Entity ID: 4
Molecule	Chains	Chain Length	2D Diagram	Glycosylation
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	F	8		N-Glycosylation
Glycosylation Resources
GlyTouCan:  G80858MF GlyCosmos:  G80858MF GlyGen:  G80858MF

Entity ID: 5
Molecule	Chains	Chain Length	2D Diagram	Glycosylation
beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose	G	3		N-Glycosylation
Glycosylation Resources
GlyTouCan:  G15407YE GlyCosmos:  G15407YE GlyGen:  G15407YE

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.263 
• R-Value Work: 0.223 
• R-Value Observed: 0.225 
• Space Group: P 4₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 77.262	α = 90
b = 77.262	β = 90
c = 350.343	γ = 90

Software Package:

Software Name	Purpose
MOLREP	phasing
REFMAC	refinement
HKL-2000	data reduction
HKL-2000	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 2011-08-03 
Deposition Author(s): Mizushima, T., Takemoto, E., Yagi, H., Shibata-Koyama, M., Isoda, Y., Iida, S., Satoh, M., Kato, K.

Revision History  

• Version 1.0: 2011-08-03
  Type: Initial release
  
• Version 1.1: 2011-11-09
  Changes: Database references, Structure summary
• Version 2.0: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Atomic model, Data collection, Database references, Derived calculations, Structure summary