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- PDB-9daz: Molecular basis of pathogenicity of the recently emerged FCoV-23 ... -

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Basic information

Entry
Database: PDB / ID: 9daz
TitleMolecular basis of pathogenicity of the recently emerged FCoV-23 coronavirus. Complex of fAPN with FCoV-23 RBD
Components
  • Aminopeptidase N,Immunoglobulin gamma-1 heavy chain
  • Spike glycoprotein
KeywordsVIRAL PROTEIN/HYDROLASE / Coronavirus / alphacoronavirus / feline coronavirus / cryo-EM / neutralization assays / binding assays / Structural Genomics / Seattle Structural Genomics Center for Infectious Disease / SSGCID / VIRAL PROTEIN-HYDROLASE complex
Function / homology
Function and homology information


alanyl aminopeptidase activity / membrane alanyl aminopeptidase / peptide catabolic process / metalloaminopeptidase activity / immunoglobulin complex / peptide binding / virus receptor activity / angiogenesis / adaptive immune response / cell differentiation ...alanyl aminopeptidase activity / membrane alanyl aminopeptidase / peptide catabolic process / metalloaminopeptidase activity / immunoglobulin complex / peptide binding / virus receptor activity / angiogenesis / adaptive immune response / cell differentiation / proteolysis / extracellular space / extracellular region / zinc ion binding / plasma membrane / cytoplasm
Similarity search - Function
Aminopeptidase N-type / ERAP1-like C-terminal domain / : / ERAP1-like C-terminal domain / Peptidase M1, alanine aminopeptidase/leukotriene A4 hydrolase / Peptidase M1, membrane alanine aminopeptidase / Aminopeptidase N-like , N-terminal domain / Peptidase family M1 domain / Peptidase M1 N-terminal domain / Aminopeptidase N-like , N-terminal domain superfamliy ...Aminopeptidase N-type / ERAP1-like C-terminal domain / : / ERAP1-like C-terminal domain / Peptidase M1, alanine aminopeptidase/leukotriene A4 hydrolase / Peptidase M1, membrane alanine aminopeptidase / Aminopeptidase N-like , N-terminal domain / Peptidase family M1 domain / Peptidase M1 N-terminal domain / Aminopeptidase N-like , N-terminal domain superfamliy / Peptidase M4/M1, CTD superfamily / : / Immunoglobulin V-Type / Immunoglobulin V-set domain / Immunoglobulin V-set domain / Neutral zinc metallopeptidases, zinc-binding region signature. / Immunoglobulin/major histocompatibility complex, conserved site / Immunoglobulins and major histocompatibility complex proteins signature. / Immunoglobulin subtype / Immunoglobulin / Immunoglobulin C-Type / Immunoglobulin C1-set / Immunoglobulin C1-set domain / Ig-like domain profile. / Immunoglobulin-like domain / Immunoglobulin-like domain superfamily / Immunoglobulin-like fold
Similarity search - Domain/homology
Immunoglobulin gamma-1 heavy chain / Aminopeptidase N
Similarity search - Component
Biological speciesFelis catus (domestic cat)
Feline coronavirus
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.5 Å
AuthorsTortorici, M.A. / Veesler, D. / Seattle Structural Genomics Center for Infectious Disease (SSGCID)
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)AI158186 United States
CitationJournal: Nature / Year: 2025
Title: Loss of FCoV-23 spike domain 0 enhances fusogenicity and entry kinetics.
Authors: M Alejandra Tortorici / Annette Choi / Cecily A Gibson / Jimin Lee / Jack T Brown / Cameron Stewart / Anshu Joshi / Sheri Harari / Isabelle Willoughby / Catherine Treichel / Elizabeth M Leaf ...Authors: M Alejandra Tortorici / Annette Choi / Cecily A Gibson / Jimin Lee / Jack T Brown / Cameron Stewart / Anshu Joshi / Sheri Harari / Isabelle Willoughby / Catherine Treichel / Elizabeth M Leaf / Jesse D Bloom / Neil P King / Christine Tait-Burkard / Gary R Whittaker / David Veesler /
Abstract: The ability of coronaviruses to recombine and cross species barriers affects human and animal health globally and is a pandemic threat. FCoV-23 is a recently emerged, highly pathogenic recombinant ...The ability of coronaviruses to recombine and cross species barriers affects human and animal health globally and is a pandemic threat. FCoV-23 is a recently emerged, highly pathogenic recombinant coronavirus responsible for a widespread outbreak of feline infectious peritonitis. Here we report cryogenic electron microscopy structures of two FCoV-23 spike isoforms that correspond to the in-host loss of domain 0 observed in clinical samples. The loss of domain 0 markedly enhances the fusogenicity and kinetics of entry into cells and possibly enables biotype switching and lethality. We show that FCoV-23 can use several aminopeptidase N orthologues as receptors and reveal the molecular determinants of receptor species tropism, including a glycan that modulates human receptor engagement. We define antigenic relationships among alphacoronaviruses that infect humans and other mammalian species and identify a cross-reactive alphacoronavirus monoclonal antibody that inhibits FCoV-23 entry. Our results pave the way for the development of vaccines and therapeutics that target this highly pathogenic virus.
History
DepositionAug 23, 2024Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jul 9, 2025Provider: repository / Type: Initial release
Revision 1.1Jul 23, 2025Group: Data collection / Database references / Category: citation / citation_author / em_admin
Item: _citation.pdbx_database_id_PubMed / _citation.title ..._citation.pdbx_database_id_PubMed / _citation.title / _citation_author.identifier_ORCID / _citation_author.name / _em_admin.last_update
Revision 1.2Sep 17, 2025Group: Data collection / Database references / Category: citation / em_admin
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _em_admin.last_update

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Aminopeptidase N,Immunoglobulin gamma-1 heavy chain
B: Spike glycoprotein
C: Aminopeptidase N,Immunoglobulin gamma-1 heavy chain
D: Spike glycoprotein
hetero molecules


Theoretical massNumber of molelcules
Total (without water)320,03520
Polymers314,0764
Non-polymers5,95816
Water3,963220
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

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Antibody / Protein , 2 types, 4 molecules ACBD

#1: Antibody Aminopeptidase N,Immunoglobulin gamma-1 heavy chain / AP-N / fAPN / Alanyl aminopeptidase / Aminopeptidase M / AP-M / Microsomal aminopeptidase / ...AP-N / fAPN / Alanyl aminopeptidase / Aminopeptidase M / AP-M / Microsomal aminopeptidase / Immunoglobulin gamma-1 heavy chain NIE


Mass: 133824.047 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Felis catus (domestic cat) / Gene: ANPEP, APN / Production host: Mammalia (mammals)
References: UniProt: P79171, UniProt: P0DOX5, membrane alanyl aminopeptidase
#2: Protein Spike glycoprotein


Mass: 23214.062 Da / Num. of mol.: 2 / Fragment: receptor-binding domain (UNP residues 532-686)
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Feline coronavirus / Strain: FCoV-23 / Production host: Mammalia (mammals)

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Sugars , 3 types, 14 molecules

#3: Polysaccharide
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 424.401 Da / Num. of mol.: 10
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/1,2,1/[a2122h-1b_1-5_2*NCC/3=O]/1-1/a4-b1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{}}LINUCSPDB-CARE
#4: Polysaccharide 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta- ...2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 570.542 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DGlcpNAcb1-4[LFucpa1-6]DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/2,3,2/[a2122h-1b_1-5_2*NCC/3=O][a1221m-1a_1-5]/1-1-2/a4-b1_a6-c1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{}[(6+1)][a-L-Fucp]{}}LINUCSPDB-CARE
#5: Sugar ChemComp-NAG / 2-acetamido-2-deoxy-beta-D-glucopyranose / N-acetyl-beta-D-glucosamine / 2-acetamido-2-deoxy-beta-D-glucose / 2-acetamido-2-deoxy-D-glucose / 2-acetamido-2-deoxy-glucose / N-ACETYL-D-GLUCOSAMINE


Type: D-saccharide, beta linking / Mass: 221.208 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C8H15NO6 / Feature type: SUBJECT OF INVESTIGATION
IdentifierTypeProgram
DGlcpNAcbCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
N-acetyl-b-D-glucopyranosamineCOMMON NAMEGMML 1.0
b-D-GlcpNAcIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
GlcNAcSNFG CARBOHYDRATE SYMBOLGMML 1.0

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Non-polymers , 2 types, 222 molecules

#6: Chemical ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: Zn / Feature type: SUBJECT OF INVESTIGATION
#7: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 220 / Source method: isolated from a natural source / Formula: H2O

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Details

Has ligand of interestY
Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: FCoV-23 S RBD in complex with feline APN / Type: COMPLEX / Entity ID: #1-#2 / Source: MULTIPLE SOURCES
Source (natural)Organism: Feline coronavirus
Source (recombinant)Organism: mammal environmental sample (environmental samples)
Buffer solutionpH: 8
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2500 nm / Nominal defocus min: 800 nm
Image recordingElectron dose: 60 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

EM softwareName: PHENIX / Version: 1.21_5207: / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 2.5 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 466950 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00215228
ELECTRON MICROSCOPYf_angle_d0.45720866
ELECTRON MICROSCOPYf_dihedral_angle_d9.5255536
ELECTRON MICROSCOPYf_chiral_restr0.0412480
ELECTRON MICROSCOPYf_plane_restr0.0042626

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