Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Hetero 4-mer - A2B2 

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

Macromolecule Content

• Total Structure Weight: 91396.41 
• Atom Count: 6418 
• Residue Count: 776 
• Unique protein chains: 2

2IWG

COMPLEX BETWEEN THE PRYSPRY DOMAIN OF TRIM21 AND IGG FC

• DOI: 10.2210/pdb2IWG/pdb

• Classification: IMMUNOGLOBULIN DOMAIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli


• Deposited: 2006-06-30 Released: 2007-03-27 
• Deposition Author(s): James, L.C., Keeble, A.H., Rhodes, D.A., Trowsdale, J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.35 Å
• R-Value Free: 0.253 
• R-Value Work: 0.215 

Literature

Structural Basis for Pryspry-Mediated Tripartite Motif (Trim) Protein Function.

James, L.C., Keeble, A.H., Khan, Z., Rhodes, D.A., Trowsdale, J.

(2007) Proc.Natl.Acad.Sci.USA 104: 6200

• PubMed: 17400754 
• DOI: 10.1073/pnas.0609174104


• PubMed Abstract: 
  

The human tripartite motif (TRIM) family comprises 70 members, including HIV restriction factor TRIM5alpha and disease-associated proteins TRIM20 (pyrin) and TRIM21. TRIM proteins have conserved domain architecture but diverse cellular roles. Here, we describe how the C-terminal PRYSPRY domain mediates diverse TRIM functions. The crystal structure of TRIM21 PRYSPRY in complex with its target IgG Fc reveals a canonical binding interface comprised of two discrete pockets formed by antibody-like variable loops. Alanine scanning of this interface has identified the hot-spot residues that control TRIM21 binding to Fc; the same hot-spots control HIV/murine leukemia virus restriction by TRIM5alpha and mediate severe familial Mediterranean fever in TRIM20/pyrin. Characterization of the IgG binding site for TRIM21 PRYSPRY reveals TRIM21 as a superantigen analogous to bacterial protein A and suggests that an antibody bipolar bridging mechanism may contribute to the pathogenic accumulation of anti-TRIM21 autoantibody immune complex in autoimmune disease.

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Organizational Affiliation: 

Protein and Nucleic Acid Chemistry Division, Medical Research Council Laboratory of Molecular Biology, Cambridge CB2 2QH, UK. [e-mail]

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
IG GAMMA-1 CHAIN C	A, D	207	Homo sapiens	Mutation(s): 0  Gene Names: IGHG1
Find proteins for P01857 (Homo sapiens) Go to UniProtKB:  P01857

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
52 KDA RO PROTEIN	B, E	181	Homo sapiens	Mutation(s): 0  Gene Names: TRIM21 (RNF81, RO52, SSA1) EC: 2.3.2.27
Find proteins for P19474 (Homo sapiens) Go to Gene View: TRIM21 Go to UniProtKB:  P19474

Small Molecules

Ligands 5 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
MAN	A, D	ALPHA-D-MANNOSE C6 H12 O6 WQZGKKKJIJFFOK-PQMKYFCFSA-N
FUC	A, D	ALPHA-L-FUCOSE C6 H12 O5 SHZGCJCMOBCMKK-SXUWKVJYSA-N
GAL	A, D	BETA-D-GALACTOSE C6 H12 O6 WQZGKKKJIJFFOK-FPRJBGLDSA-N
BMA	A, D	BETA-D-MANNOSE C6 H12 O6 WQZGKKKJIJFFOK-RWOPYEJCSA-N
NAG	A, D	N-ACETYL-D-GLUCOSAMINE C8 H15 N O6 OVRNDRQMDRJTHS-FMDGEEDCSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.35 Å
• R-Value Free: 0.253 
• R-Value Work: 0.215 
• Space Group: P 6₁

Unit Cell:

Length (Å)	Angle (°)
a = 112.490	α = 90.00
b = 112.490	β = 90.00
c = 194.609	γ = 120.00

Software Package:

Software Name	Purpose
REFMAC	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2006-06-30 
• Released Date: 2007-03-27 
• Deposition Author(s): James, L.C., Keeble, A.H., Rhodes, D.A., Trowsdale, J.

Revision History 

• Version 1.0: 2007-03-27
  Type: Initial release
• Version 1.1: 2011-05-08
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance
• Version 2.0: 2017-11-15
  Type: Advisory, Atomic model, Derived calculations, Non-polymer description, Structure summary