6CJX

Crystal structure of a Fc fragment LALA mutant (L234A, L235A) of human IgG1 (crystal form 2)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.44 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.216 
  • R-Value Observed: 0.218 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 2.2 of the entry. See complete history


Literature

Antigen-Induced Allosteric Changes in a Human IgG1 Fc Increase Low-Affinity Fc gamma Receptor Binding.

Orlandi, C.Deredge, D.Ray, K.Gohain, N.Tolbert, W.DeVico, A.L.Wintrode, P.Pazgier, M.Lewis, G.K.

(2020) Structure 

  • DOI: https://doi.org/10.1016/j.str.2020.03.001
  • Primary Citation of Related Structures:  
    6CHF, 6CJC, 6CJX

  • PubMed Abstract: 

    Antibody structure couples adaptive and innate immunity via Fab (antigen binding) and Fc (effector) domains that are connected by unique hinge regions. Because antibodies harbor two or more Fab domains, they are capable of crosslinking multi-determinant antigens, which is required for Fc-dependent functions through associative interactions with effector ligands, including C1q and cell surface Fc receptors. The modular nature of antibodies, with distal ligand binding sites for antigen and Fc-ligands, is reminiscent of allosteric proteins, suggesting that allosteric interactions might contribute to Fc-mediated effector functions. This hypothesis has been pursued for over 40 years and remains unresolved. Here, we provide evidence that allosteric interactions between Fab and Fc triggered by antigen binding modulate binding of Fc to low-affinity Fc receptors (FcγR) for a human IgG1. This work opens the path to further dissection of the relative roles of allosteric and associative interactions in Fc-mediated effector functions.


  • Organizational Affiliation

    Division of Vaccine Research, The Institute of Human Virology, University of Maryland School of Medicine, 725 West Lombard Street, Baltimore, MD 21201, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Fc fragment of human IgG1
A, B
214Homo sapiensMutation(s): 2 
Gene Names: DKFZp686C11235
UniProt
Find proteins for Q6MZV7 (Homo sapiens)
Explore Q6MZV7 
Go to UniProtKB:  Q6MZV7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ6MZV7
Glycosylation
Glycosylation Sites: 1
Sequence Annotations
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  • Reference Sequence
Oligosaccharides

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Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D 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
C, D
8N-Glycosylation
Glycosylation Resources
GlyTouCan:  G80858MF
GlyCosmos:  G80858MF
GlyGen:  G80858MF
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.44 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.216 
  • R-Value Observed: 0.218 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 49α = 90
b = 74.834β = 90
c = 145.768γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesP01 AI120756

Revision History  (Full details and data files)

  • Version 1.0: 2019-03-06
    Type: Initial release
  • Version 1.1: 2019-04-10
    Changes: Author supporting evidence, Data collection
  • Version 1.2: 2019-12-18
    Changes: Author supporting evidence, Data collection
  • Version 1.3: 2020-05-13
    Changes: Data collection, Database references
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Structure summary
  • Version 2.1: 2023-10-04
    Changes: Data collection, Database references, Derived calculations, Refinement description, Structure summary
  • Version 2.2: 2024-10-16
    Changes: Structure summary