Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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: 34.31 kDa 
• Atom Count: 2465 
• Modelled Residue Count: 306 
• Deposited Residue Count: 313 
• Unique protein chains: 2

5EU8

Structure of FIPV main protease in complex with dual inhibitors

• DOI: 10.2210/pdb5EU8/pdb

• Classification: HYDROLASE/HYDROLASE INHIBITOR
• Organism(s): Feline infectious peritonitis virus, synthetic construct
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2015-11-18 Released: 2015-12-30 
• Deposition Author(s): Wang, F., Chen, C., Liu, X., Yang, K., Xu, X., Yang, H.
• Funding Organization(s): National Key Basic Research Program of China (973 program), National Natural Science Foundation of China, Tianjin Marine Science and Technology Program

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.45 Å
• R-Value Free: 0.243 
• R-Value Work: 0.211 
• R-Value Observed: 0.213 

Literature

Crystal Structure of Feline Infectious Peritonitis Virus Main Protease in Complex with Synergetic Dual Inhibitors

Wang, F., Chen, C., Liu, X., Yang, K., Xu, X., Yang, H.

(2015) J Virol 90: 1910-1917

• PubMed: 26656689 
• DOI: 10.1128/JVI.02685-15
• Primary Citation of Related Structures:  
  5EU8


• PubMed Abstract: 
  

Coronaviruses (CoVs) can cause highly prevalent diseases in humans and animals. Feline infectious peritonitis virus (FIPV) belongs to the genus Alphacoronavirus, resulting in a lethal systemic granulomatous disease called feline infectious peritonitis (FIP), which is one of the most important fatal infectious diseases of cats worldwide. No specific vaccines or drugs have been approved to treat FIP. CoV main proteases (M(pro)s) play a pivotal role in viral transcription and replication, making them an ideal target for drug development. Here, we report the crystal structure of FIPV M(pro) in complex with dual inhibitors, a zinc ion and a Michael acceptor. The complex structure elaborates a unique mechanism of two distinct inhibitors synergizing to inactivate the protease, providing a structural basis to design novel antivirals and suggesting the potential to take advantage of zinc as an adjunct therapy against CoV-associated diseases.

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Organizational Affiliation: 

School of Life Sciences, Tianjin University, Tianjin, People's Republic of China Tianjin International Joint Academy of Biotechnology and Medicine, Tianjin, People's Republic of China [e-mail] [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
main protease	A	307	Feline infectious peritonitis virus	Mutation(s): 0  Gene Names: 1b, ORF1a EC: 3.4.19.12 (UniProt), 3.4.22 (UniProt), 2.7.7.48 (UniProt), 3.6.4.12 (UniProt), 3.6.4.13 (UniProt), 3.1.13 (UniProt), 3.1 (UniProt), 2.1.1 (UniProt)
Find proteins for Q98VG9 (Feline coronavirus (strain FIPV WSU-79/1146)) Explore Q98VG9  Go to UniProtKB:  Q98VG9

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
N-[(5-METHYLISOXAZOL-3-YL)CARBONYL]ALANYL-L-VALYL-N~1~-((1R,2Z)-4-(BENZYLOXY)-4-OXO-1-{[(3R)-2-OXOPYRROLIDIN-3-YL]METHYL}BUT-2-ENYL)-L-LEUCINAMIDE	B	6	synthetic construct	Mutation(s): 0

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ZN	A	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N
EDO	A	1,2-ETHANEDIOL C2 H6 O2 LYCAIKOWRPUZTN-UHFFFAOYSA-N

Biologically Interesting Molecules (External Reference) 1 Unique

Entity ID: 2
ID	Chains	Name	Type/Class	2D Diagram	3D Interactions
PRD_002214	B	N-[(5-METHYLISOXAZOL-3-YL)CARBONYL]ALANYL-L-VALYL-N~1~-((1R,2Z)-4-(BENZYLOXY)-4-OXO-1-{[(3R)-2-OXOPYRROLIDIN-3-YL]METHYL}BUT-2-ENYL)-L-LEUCINAMIDE	Peptide-like /  Inhibitor		--

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.45 Å
• R-Value Free: 0.243 
• R-Value Work: 0.211 
• R-Value Observed: 0.213 
• Space Group: I 4 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 112.261	α = 90
b = 112.261	β = 90
c = 102.102	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
SCALEPACK	data reduction
HKL-2000	data scaling
PHASER	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Deposited Date: 2015-11-18 
• Released Date: 2015-12-30 
Deposition Author(s): Wang, F., Chen, C., Liu, X., Yang, K., Xu, X., Yang, H.

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Funding Organization	Location	Grant Number
National Key Basic Research Program of China (973 program)	China	2015CB859800
National Natural Science Foundation of China	China	31300150
Tianjin Marine Science and Technology Program	China	KJXH2014-16

Revision History  

• Version 1.0: 2015-12-30
  Type: Initial release
  
• Version 1.1: 2016-02-10
  Changes: Database references