4HDI

Crystal Structure of 3E5 IgG3 FAB from mus musculus


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.449 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.208 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Global structures of IgG isotypes expressing identical variable regions.

Eryilmaz, E.Janda, A.Kim, J.Cordero, R.J.Cowburn, D.Casadevall, A.

(2013) Mol.Immunol. 56: 588-598

  • DOI: 10.1016/j.molimm.2013.06.006

  • PubMed Abstract: 
  • Until relatively recently the immunoglobulin molecule was viewed as composed of two independent domains comprised of the variable (V) and constant (C) regions. However, recent work has established that the C region mediates allosteric changes in the ...

    Until relatively recently the immunoglobulin molecule was viewed as composed of two independent domains comprised of the variable (V) and constant (C) regions. However, recent work has established that the C region mediates allosteric changes in the V region that can influence specificity and affinity. To further explore cross-domain interrelationship in murine IgG structure we carried out solution small angle X-ray scattering (SAXS) measurements for four V region identical IgG isotypes. SAXS analysis revealed elongated Y-shaped structures in solution with significantly different, isotype-dependent domain orientations. To further explore local C region effects on the V region, the IgG₃ Fab crystal structure from the same family was determined to 2.45 Å resolution. The IgG₃ Fab crystal structure differs from a closely related previously solved IgG1 Fab revealing significant structural differences, which may account for isotype-related specificity differences in V region identical Abs. Among the four murine isotypes, IgG₃ was the most different in solution with regards to overall structure as well as aggregate formation in solution suggesting that the greater apparent affinity of this isotype resulted from polyvalent complexes with enhanced avidity. Our results provide additional evidence that Ig V and C domains influence each other structurally and suggest that V region structure can have significant effects on overall Ig structure.


    Organizational Affiliation

    Department of Biochemistry, The Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY 10461, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Kappa light chain variable region, Anti-colorectal carcinoma light chain
L, A
219Mus musculusMutation(s): 0 
Gene Names: Igkc (Igk-C)
Find proteins for A2NHM3 (Mus musculus)
Go to UniProtKB:  A2NHM3
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Ig heavy chain V region RF, Ig gamma-3 chain C region
H, B
220Mus musculusMutation(s): 0 
Find proteins for P84751 (Mus musculus)
Go to UniProtKB:  P84751
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.449 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.208 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 67.070α = 90.00
b = 98.289β = 90.00
c = 142.363γ = 90.00
Software Package:
Software NamePurpose
MOLREPphasing
CBASSdata collection
REFMACrefinement
DENZOdata reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-04-17
    Type: Initial release
  • Version 1.1: 2013-08-21
    Type: Database references