9MVK | pdb_00009mvk

Co-crystal structure of feline coronavirus UU23 main protease with nirmatrelvir

• PDB DOI: https://doi.org/10.2210/pdb9MVK/pdb

• Classification: VIRAL PROTEIN
• Organism(s): Feline coronavirus UU23
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2025-01-15 Released: 2025-11-26 
• Deposition Author(s): Shaqra, A.M., Maryam, A., Schiffer, C.A.
• Funding Organization(s): Other private

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.97 Å
• R-Value Free: 
  0.231 (Depositor), 0.244 (DCC) 
• R-Value Work: 
  0.188 (Depositor), 0.201 (DCC) 
• R-Value Observed: 
  0.205 (Depositor) 

Starting Model: experimental

Literature

Structural Analysis of Inhibitor Binding to the Feline Enteric Coronavirus (FECV) Main Protease

Maryam, A., Moquin, S.A., Dovala, D., Kaur, J., Kurt Yilmaz, N., Shaqra, A.M., Schiffer, C.A.

(2025) Viruses 17

• DOI: https://doi.org/10.3390/v17111506

Biological Assembly 1  

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

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

Biological Assembly Evidence: gel filtration

Biological Assembly 2  

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

Biological assembly 2 assigned by authors and generated by PISA (software)

Macromolecule Content 

• Total Structure Weight: 134.09 kDa 
• Atom Count: 10,315 
• Modeled Residue Count: 1,196 
• Deposited Residue Count: 1,208 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Peptidase C30	A, B, C, D	302	Feline coronavirus UU23	Mutation(s): 0
UniProt
Find proteins for D3KDL2 (Feline coronavirus UU23) Explore D3KDL2  Go to UniProtKB:  D3KDL2

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
4WI (Subject of Investigation/LOI)	E [auth A], F [auth B], I [auth C], J [auth D]	(1R,2S,5S)-N-{(1E,2S)-1-imino-3-[(3S)-2-oxopyrrolidin-3-yl]propan-2-yl}-6,6-dimethyl-3-[3-methyl-N-(trifluoroacetyl)-L-valyl]-3-azabicyclo[3.1.0]hexane-2-carboxamide C23 H34 F3 N5 O4 WDVIRQQKRMIXGS-XIFHJVQQSA-N
PEG	G [auth B], H [auth B]	DI(HYDROXYETHYL)ETHER C4 H10 O3 MTHSVFCYNBDYFN-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.97 Å
• R-Value Free:  0.231 (Depositor), 0.244 (DCC) 
• R-Value Work:  0.188 (Depositor), 0.201 (DCC) 
• R-Value Observed: 0.205 (Depositor) 

Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 63.919	α = 90
b = 106.316	β = 90.51
c = 78.509	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
Coot	model building
XDS	data reduction
XDS	data scaling
PHASER	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2025-11-26 
Deposition Author(s): Shaqra, A.M., Maryam, A., Schiffer, C.A.

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Funding Organization	Location	Grant Number
Other private		--

Revision History  

• Version 1.0: 2025-11-26
  Type: Initial release