Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

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

Macromolecule Content

• Total Structure Weight: 21.04 kDa 
• Atom Count: 1620 
• Modelled Residue Count: 160 
• Deposited Residue Count: 173 
• Unique protein chains: 2

5TZP

Crystal structure of FPV039:Bik BH3 complex

• DOI: 10.2210/pdb5TZP/pdb

• Classification: APOPTOSIS
• Organism(s): Fowlpox virus strain NVSL, Gallus gallus
• Expression System: Escherichia coli-Pichia pastoris shuttle vector pPpARG4
• Mutation(s): No 


• Deposited: 2016-11-22 Released: 2017-05-03 
• Deposition Author(s): Anasir, M.I., Kvansakul, M.
• Funding Organization(s): Australian Research Council (ARC)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.35 Å
• R-Value Free: 0.172 
• R-Value Work: 0.147 
• R-Value Observed: 0.148 

Literature

Structural basis of apoptosis inhibition by the fowlpox virus protein FPV039.

Anasir, M.I., Caria, S., Skinner, M.A., Kvansakul, M.

(2017) J Biol Chem 292: 9010-9021

• PubMed: 28411240 
• DOI: 10.1074/jbc.M116.768879
• Primary Citation of Related Structures:  
  5TZP, 5TZQ


• PubMed Abstract: 
  

Programmed cell death or apoptosis of infected host cells is an important defense mechanism in response to viral infections. This process is regulated by proapoptotic and prosurvival members of the B-cell lymphoma 2 (Bcl-2) protein family. To counter premature death of a virus-infected cell, poxviruses use a range of different molecular strategies including the mimicry of prosurvival Bcl-2 proteins. One such viral prosurvival protein is the fowlpox virus protein FPV039, which is a potent apoptosis inhibitor, but the precise molecular mechanism by which FPV039 inhibits apoptosis is unknown. To understand how fowlpox virus inhibits apoptosis, we examined FPV039 using isothermal titration calorimetry, small-angle X-ray scattering, and X-ray crystallography. Here, we report that the fowlpox virus prosurvival protein FPV039 promiscuously binds to cellular proapoptotic Bcl-2 and engages all major proapoptotic Bcl-2 proteins. Unlike other identified viral Bcl-2 proteins to date, FPV039 engaged with cellular proapoptotic Bcl-2 with affinities comparable with those of Bcl-2's endogenous cellular counterparts. Structural studies revealed that FPV039 adopts the conserved Bcl-2 fold observed in cellular prosurvival Bcl-2 proteins and closely mimics the structure of the prosurvival Bcl-2 family protein Mcl-1. Our findings suggest that FPV039 is a pan-Bcl-2 protein inhibitor that can engage all host BH3-only proteins, as well as Bcl-2-associated X, apoptosis regulator (Bax) and Bcl-2 antagonist/killer (Bak) proteins to inhibit premature apoptosis of an infected host cell. This work therefore provides a mechanistic platform to better understand FPV039-mediated apoptosis inhibition.

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Organizational Affiliation: 

From the Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria 3086, Australia and [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Bcl-2-like protein FPV039	A	148	Fowlpox virus strain NVSL	Mutation(s): 0  Gene Names: FPV039
Find proteins for Q9J5G4 (Fowlpox virus (strain NVSL)) Explore Q9J5G4  Go to UniProtKB:  Q9J5G4

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Bik	B	25	Gallus gallus	Mutation(s): 0  Gene Names: BIK
Find proteins for E1C005 (Gallus gallus) Explore E1C005  Go to UniProtKB:  E1C005

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SO4	A	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
EDO	A	1,2-ETHANEDIOL C2 H6 O2 LYCAIKOWRPUZTN-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.35 Å
• R-Value Free: 0.172 
• R-Value Work: 0.147 
• R-Value Observed: 0.148 
• Space Group: P 4₃
• Diffraction Data DOI: 10.15785/SBGRID/500 SBGrid
• Diffraction Data DOI: 10.15785/SBGRID/513 SBGrid

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 47.848	α = 90
b = 47.848	β = 90
c = 74.303	γ = 90

Software Package:

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

Structure Validation

Entry History & Funding Information

Deposition Data

• Deposited Date: 2016-11-22 
• Released Date: 2017-05-03 
Deposition Author(s): Anasir, M.I., Kvansakul, M.

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Funding Organization	Location	Grant Number
Australian Research Council (ARC)	Australia	FT130101349

Revision History  

• Version 1.0: 2017-05-03
  Type: Initial release
  
• Version 1.1: 2017-06-14
  Changes: Database references
• Version 1.2: 2020-01-01
  Changes: Author supporting evidence