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- PDB-9k9n: Cryo-EM structure of MjHKU4r-CoV-1 receptor-binding domain comple... -

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Basic information

Entry
Database: PDB / ID: 9k9n
TitleCryo-EM structure of MjHKU4r-CoV-1 receptor-binding domain complexed with human CD26
Components
  • Dipeptidyl peptidase 4 soluble form
  • Spike protein S1
KeywordsVIRAL PROTEIN/HYDROLASE / Complex / VIRAL PROTEIN-HYDROLASE complex
Function / homology
Function and homology information


glucagon processing / negative regulation of neutrophil chemotaxis / regulation of cell-cell adhesion mediated by integrin / Synthesis, secretion, and inactivation of Glucose-dependent Insulinotropic Polypeptide (GIP) / negative regulation of extracellular matrix disassembly / dipeptidyl-peptidase IV / chemorepellent activity / psychomotor behavior / intercellular canaliculus / dipeptidyl-peptidase activity ...glucagon processing / negative regulation of neutrophil chemotaxis / regulation of cell-cell adhesion mediated by integrin / Synthesis, secretion, and inactivation of Glucose-dependent Insulinotropic Polypeptide (GIP) / negative regulation of extracellular matrix disassembly / dipeptidyl-peptidase IV / chemorepellent activity / psychomotor behavior / intercellular canaliculus / dipeptidyl-peptidase activity / peptide hormone processing / locomotory exploration behavior / lamellipodium membrane / endocytic vesicle / aminopeptidase activity / endothelial cell migration / behavioral fear response / T cell costimulation / receptor-mediated endocytosis of virus by host cell / serine-type peptidase activity / T cell activation / Synthesis, secretion, and inactivation of Glucagon-like Peptide-1 (GLP-1) / lamellipodium / virus receptor activity / protease binding / membrane fusion / host cell endoplasmic reticulum-Golgi intermediate compartment membrane / response to hypoxia / receptor-mediated virion attachment to host cell / cell adhesion / apical plasma membrane / membrane raft / endocytosis involved in viral entry into host cell / signaling receptor binding / lysosomal membrane / fusion of virus membrane with host plasma membrane / serine-type endopeptidase activity / focal adhesion / fusion of virus membrane with host endosome membrane / positive regulation of cell population proliferation / viral envelope / symbiont entry into host cell / host cell plasma membrane / virion membrane / cell surface / protein homodimerization activity / proteolysis / extracellular exosome / extracellular region / identical protein binding / membrane / plasma membrane
Similarity search - Function
Spike (S) protein S1 subunit, N-terminal domain, MERS-CoV-like / Prolyl endopeptidase family serine active site. / : / Peptidase S9, serine active site / Dipeptidylpeptidase IV, N-terminal domain / Dipeptidyl peptidase IV (DPP IV) N-terminal region / Peptidase S9, prolyl oligopeptidase, catalytic domain / Prolyl oligopeptidase family / Spike glycoprotein S2, coronavirus, C-terminal / Coronavirus spike glycoprotein S2, intravirion ...Spike (S) protein S1 subunit, N-terminal domain, MERS-CoV-like / Prolyl endopeptidase family serine active site. / : / Peptidase S9, serine active site / Dipeptidylpeptidase IV, N-terminal domain / Dipeptidyl peptidase IV (DPP IV) N-terminal region / Peptidase S9, prolyl oligopeptidase, catalytic domain / Prolyl oligopeptidase family / Spike glycoprotein S2, coronavirus, C-terminal / Coronavirus spike glycoprotein S2, intravirion / Alpha/Beta hydrolase fold / 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
Spike glycoprotein / Dipeptidyl peptidase 4
Similarity search - Component
Biological speciesHomo sapiens (human)
Tylonycteris bat coronavirus HKU4
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.61 Å
AuthorsSun, J.Q.
Funding support China, 1items
OrganizationGrant numberCountry
Chinese Academy of SciencesXDB29010202 China
CitationJournal: Hlife / Year: 2025
Title: Rational design of human CD26 receptor for a strong neutralizing ability against MjHKU4r-CoV-1 and MERS-CoV
Authors: Zhang, Y. / Tian, M. / Han, Y. / Sun, J. / Li, W. / Bai, C. / Su, C. / Han, P.
History
DepositionOct 27, 2024Deposition site: PDBJ / Processing site: PDBC
Revision 1.0Sep 3, 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: Dipeptidyl peptidase 4 soluble form
B: Dipeptidyl peptidase 4 soluble form
C: Spike protein S1
hetero molecules


Theoretical massNumber of molelcules
Total (without water)207,88919
Polymers202,4983
Non-polymers5,39116
Water00
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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Protein , 2 types, 3 molecules ABC

#1: Protein Dipeptidyl peptidase 4 soluble form / Dipeptidyl peptidase IV soluble form


Mass: 88445.375 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: DPP4, ADCP2, CD26 / Production host: Homo sapiens (human) / References: UniProt: P27487
#2: Protein Spike protein S1 / S glycoprotein / E2 / Peplomer protein


Mass: 25607.250 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Details: Sequence reference for strain 'Tylonycteris bat coronavirus HKU4' is not available in UniProt at the time of biocuration. Current sequence reference is from UniProt id A0AAE8ZFM2.
Source: (gene. exp.) Tylonycteris bat coronavirus HKU4 / Production host: Homo sapiens (human) / References: UniProt: A0AAE8ZFM2

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Sugars , 4 types, 16 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.: 4
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 alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-beta-D-mannopyranose-(1-4)-2-acetamido-2- ...alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 910.823 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpa1-2DManpa1-3DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/3,5,4/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5][a1122h-1a_1-5]/1-1-2-3-3/a4-b1_b4-c1_c3-d1_d2-e1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{[(3+1)][a-D-Manp]{[(2+1)][a-D-Manp]{}}}}}LINUCSPDB-CARE
#5: 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.: 1 / Source method: obtained synthetically
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
#6: 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.: 10 / 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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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: Cryo-EM structure of MjHKU4r-CoV-1 receptor-binding domain complexed with human CD26
Type: COMPLEX / Entity ID: #1-#2 / Source: MULTIPLE SOURCES
Source (natural)Organism: Mammalia (mammals)
Source (recombinant)Organism: Homo sapiens (human)
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: 2000 nm / Nominal defocus min: 1000 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: 2.61 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 237919 / Symmetry type: POINT
RefinementHighest resolution: 2.61 Å
Stereochemistry target values: REAL-SPACE (WEIGHTED MAP SUM AT ATOM CENTERS)
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00314225
ELECTRON MICROSCOPYf_angle_d0.47219342
ELECTRON MICROSCOPYf_dihedral_angle_d5.6522023
ELECTRON MICROSCOPYf_chiral_restr0.0452123
ELECTRON MICROSCOPYf_plane_restr0.0042431

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