9UEP | pdb_00009uep

The structure of FIPV RBD and cat APN complex

• PDB DOI: https://doi.org/10.2210/pdb9UEP/pdb
• EM Map EMD-64088: EMDB EMDataResource

• Classification: PROTEIN BINDING
• Organism(s): Feline infectious peritonitis virus (strain 79-1146), Felis catus
• Expression System: Homo sapiens
• Mutation(s): No 


• Deposited: 2025-04-09 Released: 2026-01-07 
• Deposition Author(s): Sun, J.Q.
• Funding Organization(s): National Natural Science Foundation of China (NSFC)

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 2.85 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

The structure of FIPV RBD and cat APN complex

Sun, J.Q.

To be published.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: electron microscopy

Macromolecule Content 

• Total Structure Weight: 127.55 kDa 
• Atom Count: 8,514 
• Modeled Residue Count: 1,049 
• Deposited Residue Count: 1,106 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Spike glycoprotein	A	174	Feline infectious peritonitis virus (strain 79-1146)	Mutation(s): 0  Gene Names: S, 2
UniProt
Find proteins for P10033 (Feline coronavirus (strain FIPV WSU-79/1146)) Explore P10033  Go to UniProtKB:  P10033
Glycosylation
Glycosylation Sites: 1

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Aminopeptidase N	B [auth C]	932	Felis catus	Mutation(s): 0  Gene Names: ANPEP, APN EC: 3.4.11.2
UniProt
Find proteins for P79171 (Felis catus) Explore P79171  Go to UniProtKB:  P79171
Glycosylation
Glycosylation Sites: 6

Oligosaccharides

Help

Entity ID: 3
Molecule	Chains	Length	2D Diagram	Glycosylation	3D Interactions
beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranose	C [auth B]	4		N-Glycosylation

Entity ID: 4
Molecule	Chains	Length	2D Diagram	Glycosylation	3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose	D, E	2		N-Glycosylation

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
NAG (Subject of Investigation/LOI)	F [auth A], G [auth C], H [auth C], I [auth C]	2-acetamido-2-deoxy-beta-D-glucopyranose C8 H15 N O6 OVRNDRQMDRJTHS-FMDGEEDCSA-N

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 2.85 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
MODEL REFINEMENT	PHENIX

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2026-01-07 
Deposition Author(s): Sun, J.Q.

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Funding Organization	Location	Grant Number
National Natural Science Foundation of China (NSFC)	China	32270157

Revision History  

• Version 1.0: 2026-01-07
  Type: Initial release