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- PDB-9jmh: Cryo-EM structure of HKU25-BatCoV S-trimer stabilized with 2P and... -

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Basic information

Entry
Database: PDB / ID: 9jmh
TitleCryo-EM structure of HKU25-BatCoV S-trimer stabilized with 2P and x1 disulfide bond
ComponentsSpike glycoprotein,Fibritin
KeywordsVIRAL PROTEIN / spike protein
Function / homology
Function and homology information


virion component / host cell endoplasmic reticulum-Golgi intermediate compartment membrane / receptor-mediated virion attachment to host cell / endocytosis involved in viral entry into host cell / fusion of virus membrane with host plasma membrane / fusion of virus membrane with host endosome membrane / viral envelope / host cell plasma membrane / virion membrane / membrane
Similarity search - Function
Spike (S) protein S1 subunit, receptor-binding domain, MERS-CoV-like / Spike (S) protein S1 subunit, N-terminal domain, MERS-CoV-like / Fibritin C-terminal / Fibritin C-terminal region / Spike glycoprotein S2, coronavirus, C-terminal / Coronavirus spike glycoprotein S2, intravirion / Coronavirus spike glycoprotein S1, C-terminal / Coronavirus spike glycoprotein S1, C-terminal / Spike glycoprotein, N-terminal domain superfamily / Spike S1 subunit, receptor binding domain superfamily, betacoronavirus ...Spike (S) protein S1 subunit, receptor-binding domain, MERS-CoV-like / Spike (S) protein S1 subunit, N-terminal domain, MERS-CoV-like / Fibritin C-terminal / Fibritin C-terminal region / Spike glycoprotein S2, coronavirus, C-terminal / Coronavirus spike glycoprotein S2, intravirion / Coronavirus spike glycoprotein S1, C-terminal / Coronavirus spike glycoprotein S1, C-terminal / Spike glycoprotein, N-terminal domain superfamily / Spike S1 subunit, receptor binding domain superfamily, betacoronavirus / Spike glycoprotein, betacoronavirus / Betacoronavirus spike (S) glycoprotein S1 subunit N-terminal (NTD) domain profile. / Betacoronavirus spike (S) glycoprotein S1 subunit C-terminal (CTD) domain profile. / Spike (S) protein S1 subunit, receptor-binding domain, betacoronavirus / Betacoronavirus spike glycoprotein S1, receptor binding / Spike glycoprotein S1, N-terminal domain, betacoronavirus-like / Betacoronavirus-like spike glycoprotein S1, N-terminal / Spike glycoprotein S2 superfamily, coronavirus / Spike glycoprotein S2, coronavirus, heptad repeat 1 / Spike glycoprotein S2, coronavirus, heptad repeat 2 / Coronavirus spike (S) glycoprotein S2 subunit heptad repeat 1 (HR1) region profile. / Coronavirus spike (S) glycoprotein S2 subunit heptad repeat 2 (HR2) region profile. / Spike glycoprotein S2, coronavirus / Coronavirus spike glycoprotein S2
Similarity search - Domain/homology
LINOLEIC ACID / Spike glycoprotein / Fibritin
Similarity search - Component
Biological speciesHypsugo bat coronavirus HKU25
Tequatrovirus T4
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3 Å
AuthorsYuan, H. / Xiong, X.
Funding support3items
OrganizationGrant numberCountry
Other governmentSRPG22-002
Other government2021YFA1300903
Other government2022A1515110495
CitationJournal: Sci Adv / Year: 2025
Title: Structures and receptor binding activities of merbecovirus spike proteins reveal key signatures for human DPP4 adaptation.
Authors: Hang Yuan / Jingjing Wang / Yong Ma / Zimu Li / Xijie Gao / Gul Habib / Banghui Liu / Jing Chen / Jun He / Peng Zhou / Zheng-Li Shi / Xinwen Chen / Xiaoli Xiong /
Abstract: Merbecoviruses from bats, pangolins, and hedgehogs pose significant zoonotic threats, with a limited understanding of receptor binding by their spike (S) proteins. Here, we report cryo-EM structures ...Merbecoviruses from bats, pangolins, and hedgehogs pose significant zoonotic threats, with a limited understanding of receptor binding by their spike (S) proteins. Here, we report cryo-EM structures of GD-BatCoV (BtCoV-422) and SE-PangolinCoV (MjHKU4r-CoV-1) RBDs in complex with human DPP4 (hDPP4). These structures exhibit a substantial offset in their hDPP4 interaction interfaces, revealing a conserved hydrophobic cluster as a convergent signature of DPP4 binding within the MERS-HKU4 clade of merbecoviruses. Structure-guided mutagenesis demonstrates that favorable interactions are distributed across multiple receptor binding motif (RBM) regions, working synergistically to confer high-affinity hDPP4 binding. Swapping of the merbecovirus RBM regions indicate limited plasticity and interchangeability among these regions. In addition, we report cryo-EM structures of six merbecovirus S-trimers. Structure-based phylogenetics suggests that hDPP4-binding merbecoviruses undergo convergent evolution, while ACE2-binding merbecoviruses exhibit diversification in their binding mechanisms. These findings offer critical insights into merbecovirus receptor utilization, providing a structural understanding for future surveillance.
History
DepositionSep 20, 2024Deposition site: PDBJ / Processing site: PDBC
Revision 1.0Jun 18, 2025Provider: repository / Type: Initial release
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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Spike glycoprotein,Fibritin
B: Spike glycoprotein,Fibritin
C: Spike glycoprotein,Fibritin
hetero molecules


Theoretical massNumber of molelcules
Total (without water)472,92460
Polymers455,9143
Non-polymers17,01157
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein Spike glycoprotein,Fibritin / S glycoprotein / E2 / Peplomer protein / Collar protein / Whisker antigen control protein


Mass: 151971.281 Da / Num. of mol.: 3 / Mutation: S437C,D1051C,A1052P,V1053P
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Hypsugo bat coronavirus HKU25, (gene. exp.) Tequatrovirus T4
Gene: wac / Production host: Homo sapiens (human) / References: UniProt: A0A2I4R888, UniProt: P10104
#2: 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
#3: Polysaccharide
beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta- ...beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 586.542 Da / Num. of mol.: 6
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/2,3,2/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5]/1-1-2/a4-b1_b4-c1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{}}}LINUCSPDB-CARE
#4: Chemical ChemComp-EIC / LINOLEIC ACID / 9,12-LINOLEIC ACID


Mass: 280.445 Da / Num. of mol.: 3 / Source method: obtained synthetically / Formula: C18H32O2 / Feature type: SUBJECT OF INVESTIGATION
#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.: 38 / 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
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: HKU25-BatCoV Spike protein (with 2P-x1 stabilization) / Type: ORGANELLE OR CELLULAR COMPONENT / Entity ID: #1 / Source: RECOMBINANT
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
11Hypsugo bat coronavirus HKU252020423
21Enterobacteria phage T4 (virus)10665
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7.4
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: Talos Arctica / Image courtesy: FEI Company
MicroscopyModel: FEI TALOS ARCTICA
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Illumination mode: OTHER
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 / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 110266 / Symmetry type: POINT
RefinementHighest resolution: 3 Å
Stereochemistry target values: REAL-SPACE (WEIGHTED MAP SUM AT ATOM CENTERS)
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00328058
ELECTRON MICROSCOPYf_angle_d0.58138148
ELECTRON MICROSCOPYf_dihedral_angle_d5.3834187
ELECTRON MICROSCOPYf_chiral_restr0.0454457
ELECTRON MICROSCOPYf_plane_restr0.0054857

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