Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: gel filtration

Macromolecule Content

• Total Structure Weight: 23.8 kDa 
• Atom Count: 1,743 
• Modelled Residue Count: 205 
• Deposited Residue Count: 207 
• Unique protein chains: 1

 8GBE

Structure of a viral gasdermin protein A47 from Eptesipox virus

• PDB DOI: 10.2210/pdb8GBE/pdb

• Classification: VIRAL PROTEIN
• Organism(s): Eptesipox virus
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2023-02-25 Released: 2023-03-15 
• Deposition Author(s): Johnson, A.G., Kranzusch, P.J.
• Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.46 Å
• R-Value Free: 0.212 
• R-Value Work: 0.191 
• R-Value Observed: 0.192 

Literature

Structural homology screens reveal poxvirus-encoded proteins impacting inflammasome-mediated defenses.

Boys, I.N., Johnson, A.G., Quinlan, M., Kranzusch, P.J., Elde, N.C.

(2023) Biorxiv 

• PubMed: 36909515 
• DOI: 10.1101/2023.02.26.529821
• Primary Citation of Related Structures:  
  8GBE


• PubMed Abstract: 
  

Viruses acquire host genes via horizontal gene transfer and can express them to manipulate host biology during infections. Some viral and host homologs retain sequence identity, but evolutionary divergence can obscure host origins. We used structural modeling to compare vaccinia virus proteins with metazoan proteomes. We identified vaccinia A47L as a homolog of gasdermins, the executioners of pyroptosis. An X-ray crystal structure of A47 confirmed this homology and cell-based assays revealed that A47 inhibits pyroptosis. We also identified vaccinia C1L as the product of a cryptic gene fusion event coupling a Bcl-2 related fold with a pyrin domain. C1 associates with components of the inflammasome, a cytosolic innate immune sensor involved in pyroptosis, yet paradoxically enhances inflammasome activity, suggesting a benefit to poxvirus replication in some circumstances. Our findings demonstrate the potential of structural homology screens to reveal genes that viruses capture from hosts and repurpose to benefit viral fitness.

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Organizational Affiliation: 

Department of Photon Science, Stanford University, Stanford, CA 94305.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Protein A47	A	207	Eptesipox virus	Mutation(s): 0  Gene Names: EPTV-WA-146
UniProt
Find proteins for A0A220T6L2 (Eptesipox virus) Explore A0A220T6L2  Go to UniProtKB:  A0A220T6L2

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.46 Å
• R-Value Free: 0.212 
• R-Value Work: 0.191 
• R-Value Observed: 0.192 
• Space Group: C 2 2 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 64.465	α = 90
b = 74.14	β = 90
c = 95.599	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
XDS	data reduction
Aimless	data scaling
PHENIX	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2023-03-15 
Deposition Author(s): Johnson, A.G., Kranzusch, P.J.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	--

Revision History  

• Version 1.0: 2023-03-15
  Type: Initial release
  
• Version 1.1: 2023-03-22
  Changes: Database references