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Basic information

Entry
Database: PDB / ID: 9kr6
TitleCryo-EM structure of MPXV core protease in complex with the substrate derivative I-G18
Components
  • Core protease I7
  • Core protein VP8
KeywordsVIRAL PROTEIN / ORTHOPOXVIRUSES / MONKEYPOX / PROTEASE / VIRAL REPLICATION / DRUG DISCOVERY
Function / homology
Function and homology information


cysteine-type peptidase activity / virion component / viral capsid / host cell cytoplasm / structural molecule activity / proteolysis
Similarity search - Function
Poxvirus VP8/L4R, nucleic acid binding / Poxvirus nucleic acid binding protein VP8/L4R / Peptidase C57, Vaccinia virus protein I7 / Vaccinia virus I7 processing peptidase / Papain-like cysteine peptidase superfamily
Similarity search - Domain/homology
Core protein VP8 / MPXVgp068
Similarity search - Component
Biological speciesMonkeypox virus
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.8 Å
AuthorsLan, W. / You, T. / Li, D. / Dong, X. / Wang, H. / Xu, J. / Wang, W. / Gao, Y. / Yang, H.
Funding support China, 2items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)81902063 China
National Natural Science Foundation of China (NSFC)81902063 China
CitationJournal: Nature / Year: 2025
Title: Substrate recognition and cleavage mechanism of the monkeypox virus core protease.
Authors: Yan Gao / Xiong Xie / Xiaoyu Zhang / Junyuan Cao / Weiqi Lan / Tian You / Dongxu Li / Xuxue Dong / Wenhao Dai / Yingchun Xiang / Shulei Hu / Weijuan Shang / Botao Wu / Yumin Zhang / Jin Xu / ...Authors: Yan Gao / Xiong Xie / Xiaoyu Zhang / Junyuan Cao / Weiqi Lan / Tian You / Dongxu Li / Xuxue Dong / Wenhao Dai / Yingchun Xiang / Shulei Hu / Weijuan Shang / Botao Wu / Yumin Zhang / Jin Xu / Xiaoce Liu / Haofeng Wang / Wanlong Hu / Mingjing Zhang / Yinkai Duan / Wen Cui / Hao Zhou / Shengjiang Mao / Handi Jia / Zhanqi Sun / Menghan Jia / Yue Yin / Henry C Nguyen / Kailin Yang / Bei Yang / Xiuna Yang / Xiaoyun Ji / Gengfu Xiao / Wei Wang / Leike Zhang / Zihe Rao / Hong Liu / Haitao Yang /
Abstract: Poxviruses cause severe diseases, including smallpox and mpox, that pose major threats to human health. The poxvirus core protease (Core) is essential for viral maturation and is highly conserved in ...Poxviruses cause severe diseases, including smallpox and mpox, that pose major threats to human health. The poxvirus core protease (Core) is essential for viral maturation and is highly conserved in poxviruses, making it an attractive antiviral target. However, the structure of Core remains unknown, hampering antiviral development. Here we determined the apo structure of monkeypox virus (MPXV) Core and the structure of Core in a complex with the inhibitor aloxistatin, a drug candidate for muscular dystrophy. These structures show that Core forms a homodimer that features a unique 'dancing couple' fold. The catalytic intermediate state of Core was characterized by an aldehyde derivative from a natural substrate (I-G18). This derivative binds covalently to the catalytic Cys328, shifting the active site of the viral protease from a closed conformation in the apo form to a favourable open conformation upon substrate binding. On the basis of the Core-I-G18 complex, we designed a series of peptidomimetic inhibitors with a nitrile warhead, which could covalently anchor with the catalytic Cys328. These compounds inhibit Core with half-maximal inhibitory concentrations of 44.9-100.3 nM, and exhibit potent and broad anti-poxvirus activity. Our studies provide a basis for designing wide-spectrum inhibitors against poxvirus infections.
History
DepositionNov 27, 2024Deposition site: PDBJ / Processing site: PDBC
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Item: _atom_site.B_iso_or_equiv / _atom_site.Cartn_x ..._atom_site.B_iso_or_equiv / _atom_site.Cartn_x / _atom_site.Cartn_y / _atom_site.Cartn_z / _atom_site.auth_atom_id / _atom_site.auth_comp_id / _atom_site.auth_seq_id / _atom_site.group_PDB / _atom_site.label_atom_id / _atom_site.label_comp_id / _atom_site.type_symbol / _chem_comp.formula / _chem_comp.formula_weight / _chem_comp.id / _chem_comp.mon_nstd_flag / _chem_comp.name / _chem_comp.type / _em_admin.last_update / _entity.formula_weight / _entity.pdbx_mutation / _entity_poly.nstd_monomer / _entity_poly.pdbx_seq_one_letter_code / _entity_poly.pdbx_seq_one_letter_code_can / _entity_poly_seq.mon_id / _pdbx_poly_seq_scheme.auth_seq_num / _pdbx_poly_seq_scheme.mon_id / _pdbx_poly_seq_scheme.pdb_mon_id / _pdbx_poly_seq_scheme.pdb_seq_num / _pdbx_struct_assembly.details / _pdbx_struct_oper_list.symmetry_operation / _pdbx_validate_close_contact.auth_asym_id_1 / _pdbx_validate_close_contact.auth_asym_id_2 / _pdbx_validate_close_contact.auth_comp_id_2 / _pdbx_validate_close_contact.auth_seq_id_2 / _pdbx_validate_close_contact.dist / _pdbx_validate_main_chain_plane.improper_torsion_angle / _refine.ls_d_res_high / _struct_conn.pdbx_dist_value / _struct_conn.pdbx_value_order / _struct_conn.ptnr2_auth_comp_id / _struct_conn.ptnr2_auth_seq_id / _struct_conn.ptnr2_label_comp_id / _struct_ref_seq.pdbx_auth_seq_align_end
Description: Ligand identity / Provider: author / Type: Coordinate replacement
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Category: em_3d_reconstruction / em_admin ...em_3d_reconstruction / em_admin / em_ctf_correction / em_euler_angle_assignment / em_image_processing / em_image_recording / em_software / em_start_model / entity / entity_poly / pdbx_database_related / struct_ref_seq / struct_ref_seq_dif
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Item: _chem_comp.name / _em_admin.last_update ..._chem_comp.name / _em_admin.last_update / _entity.formula_weight / _entity.pdbx_mutation / _entity_poly.nstd_monomer / _entity_poly.pdbx_seq_one_letter_code / _entity_poly.pdbx_seq_one_letter_code_can / _struct_ref_seq.pdbx_auth_seq_align_end
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Item: _atom_site.Cartn_x / _atom_site.Cartn_y ..._atom_site.Cartn_x / _atom_site.Cartn_y / _atom_site.Cartn_z / _atom_site.auth_atom_id / _atom_site.auth_comp_id / _atom_site.auth_seq_id / _atom_site.group_PDB / _atom_site.label_atom_id / _atom_site.label_comp_id / _atom_site.type_symbol / _chem_comp.formula / _chem_comp.formula_weight / _chem_comp.id / _chem_comp.mon_nstd_flag / _chem_comp.name / _chem_comp.type / _citation.country / _citation.journal_abbrev / _citation.journal_id_ASTM / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year / _em_admin.last_update / _entity.formula_weight / _entity.pdbx_mutation / _entity_poly.nstd_monomer / _entity_poly.pdbx_seq_one_letter_code / _entity_poly.pdbx_seq_one_letter_code_can / _entity_poly_seq.mon_id / _pdbx_poly_seq_scheme.mon_id / _pdbx_poly_seq_scheme.pdb_mon_id / _pdbx_poly_seq_scheme.pdb_seq_num / _pdbx_validate_close_contact.auth_comp_id_2 / _pdbx_validate_close_contact.auth_seq_id_2 / _struct_ref_seq.pdbx_auth_seq_align_end
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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Core protease I7
C: Core protein VP8
B: Core protease I7
D: Core protein VP8


Theoretical massNumber of molelcules
Total (without water)100,4314
Polymers100,4314
Non-polymers00
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

#1: Protein Core protease I7 / I7L / MPXV-COP-062 / MPXV-SL-062 / MPXV-WRAIR062 / MPXVgp068 / Viral core cysteine proteinase / ...I7L / MPXV-COP-062 / MPXV-SL-062 / MPXV-WRAIR062 / MPXVgp068 / Viral core cysteine proteinase / Virion core cysteine protease


Mass: 49088.477 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Monkeypox virus
Gene: I7L, MPXV-CAM1990_02-060, MPXV-COP-062, MPXV-GAB1988_001-061, MPXV-Ikubi-060, MPXV-M2940_FCT-066, MPXV-M2957_Lagos-066, MPXV-M3021_Delta-066, MPXV-M5320_M15_Bayelsa-059, MPXV-Nig_SEV71_2_82- ...Gene: I7L, MPXV-CAM1990_02-060, MPXV-COP-062, MPXV-GAB1988_001-061, MPXV-Ikubi-060, MPXV-M2940_FCT-066, MPXV-M2957_Lagos-066, MPXV-M3021_Delta-066, MPXV-M5320_M15_Bayelsa-059, MPXV-Nig_SEV71_2_82-061, MPXV-PCH-063, MPXV-Singapore-066, MPXV-SL-062, MPXV-UK_P1-066, MPXV-UK_P2-066, MPXV-UK_P3-066, MPXV-UTC-057, MPXV-W_Nigeria-061, MPXV-WRAIR062, MPXV297957_057, MPXV298464_048, MPXV_DRC_Yandongi_069, MPXV_LIB1970_184_073, MPXV_RCG2003_358_073, MPXV_SUD2005_01_069, MPXV_ZAI1979_005_073, MPXVgp068, PDLMKLCO_00071
Production host: Escherichia coli (E. coli)
References: UniProt: Q5IXV7, Hydrolases; Acting on peptide bonds (peptidases); Cysteine endopeptidases
#2: Protein/peptide Core protein VP8


Mass: 1127.243 Da / Num. of mol.: 2 / Mutation: G18(ETA) / Source method: obtained synthetically / Source: (synth.) Monkeypox virus / References: UniProt: M1L511
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: DIMER / Type: COMPLEX / Details: MONKEYPOX I7 IS A DIMER / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Monkeypox virus
Source (recombinant)Organism: Escherichia coli (E. coli)
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: 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: 1800 nm / Nominal defocus min: 1200 nm
Image recording
IDImaging-IDElectron dose (e/Å2)Film or detector model
1160GATAN K3 (6k x 4k)
2160GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

EM softwareName: cryoSPARC / Category: 3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 2.8 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 760440 / Symmetry type: POINT
RefinementHighest resolution: 2.8 Å

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