Biological Assembly 1  

 3D View: Structure | Electron Density

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

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

Macromolecule Content

• Total Structure Weight: 51.84 kDa 
• Atom Count: 3703 
• Residue Count: 444 
• Unique protein chains: 1

4M0Q

Ebola virus VP24 structure

• DOI: 10.2210/pdb4M0Q/pdb

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


• Deposited: 2013-08-01 Released: 2014-03-19 
• Deposition Author(s): Xu, W., Leung, D.W., Borek, D., Amarasinghe, G.K.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.92 Å
• R-Value Free: 0.232 
• R-Value Work: 0.209 
• R-Value Observed: 0.211 

Literature

The Marburg Virus VP24 Protein Interacts with Keap1 to Activate the Cytoprotective Antioxidant Response Pathway.

Edwards, M.R., Johnson, B., Mire, C.E., Xu, W., Shabman, R.S., Speller, L.N., Leung, D.W., Geisbert, T.W., Amarasinghe, G.K., Basler, C.F.

(2014) Cell Rep 6: 1017-1025

• PubMed: 24630991 
• DOI: 10.1016/j.celrep.2014.01.043
• Primary Citation of Related Structures:  
  4M0Q


• PubMed Abstract: 
  

Kelch-like ECH-associated protein 1 (Keap1) is a ubiquitin E3 ligase specificity factor that targets transcription factor nuclear factor (erythroid-derived 2)-like 2 (Nrf2) for ubiquitination and degradation. Disrupting Keap1-Nrf2 interaction stabilizes Nrf2, resulting in Nrf2 nuclear accumulation, binding to antioxidant response elements (AREs), and transcription of cytoprotective genes. Marburg virus (MARV) is a zoonotic pathogen that likely uses bats as reservoir hosts. We demonstrate that MARV protein VP24 (mVP24) binds the Kelch domain of either human or bat Keap1. This binding is of high affinity and 1:1 stoichiometry and activates Nrf2. Modeling based on the Zaire ebolavirus (EBOV) VP24 (eVP24) structure identified in mVP24 an acidic loop (K-loop) critical for Keap1 interaction. Transfer of the K-loop to eVP24, which otherwise does not bind Keap1, confers Keap1 binding and Nrf2 activation, and infection by MARV, but not EBOV, activates ARE gene expression. Therefore, MARV targets Keap1 to activate Nrf2-induced cytoprotective responses during infection.

---

Organizational Affiliation: 

Department Microbiology, Icahn School of Medicine, Mount Sinai, New York, NY 10029, USA. Electronic address: [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Membrane-associated protein VP24	A, B	230	Zaire ebolavirus	Mutation(s): 0  Gene Names: VP24
Find proteins for Q05322 (Zaire ebolavirus (strain Mayinga-76)) Explore Q05322  Go to UniProtKB:  Q05322

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.92 Å
• R-Value Free: 0.232 
• R-Value Work: 0.209 
• R-Value Observed: 0.211 
• Space Group: P 4₃ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 71.775	α = 90
b = 71.775	β = 90
c = 191.165	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
MOLREP	phasing
PHENIX	refinement
PDB_EXTRACT	data extraction
HKL-3000	data collection
HKL-3000	data reduction
HKL-3000	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2013-08-01 
• Released Date: 2014-03-19 
Deposition Author(s): Xu, W., Leung, D.W., Borek, D., Amarasinghe, G.K.

Revision History 

• Version 1.0: 2014-03-19
  Type: Initial release
  
• Version 1.1: 2014-04-02
  Changes: Database references
• Version 1.2: 2014-04-16
  Changes: Database references
• Version 1.3: 2017-11-15
  Changes: Refinement description