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- PDB-9j6k: HBx complexed with DDB1 -

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Basic information

Entry
Database: PDB / ID: 9j6k
TitleHBx complexed with DDB1
Components
  • DNA damage-binding protein 1
  • Protein X
KeywordsVIRAL PROTEIN / HBV / complex
Function / homology
Function and homology information


symbiont-mediated activation of host NF-kappaB cascade / symbiont-mediated arrest of host cell cycle during G2/M transition / positive regulation by virus of viral protein levels in host cell / spindle assembly involved in female meiosis / epigenetic programming in the zygotic pronuclei / UV-damage excision repair / biological process involved in interaction with symbiont / regulation of mitotic cell cycle phase transition / WD40-repeat domain binding / Cul4A-RING E3 ubiquitin ligase complex ...symbiont-mediated activation of host NF-kappaB cascade / symbiont-mediated arrest of host cell cycle during G2/M transition / positive regulation by virus of viral protein levels in host cell / spindle assembly involved in female meiosis / epigenetic programming in the zygotic pronuclei / UV-damage excision repair / biological process involved in interaction with symbiont / regulation of mitotic cell cycle phase transition / WD40-repeat domain binding / Cul4A-RING E3 ubiquitin ligase complex / Cul4-RING E3 ubiquitin ligase complex / Cul4B-RING E3 ubiquitin ligase complex / ubiquitin ligase complex scaffold activity / negative regulation of reproductive process / negative regulation of developmental process / cullin family protein binding / viral release from host cell / host cell mitochondrion / ectopic germ cell programmed cell death / positive regulation of viral genome replication / proteasomal protein catabolic process / positive regulation of gluconeogenesis / viral genome replication / Recognition of DNA damage by PCNA-containing replication complex / DNA Damage Recognition in GG-NER / nucleotide-excision repair / Dual Incision in GG-NER / Transcription-Coupled Nucleotide Excision Repair (TC-NER) / Formation of TC-NER Pre-Incision Complex / Formation of Incision Complex in GG-NER / regulation of circadian rhythm / Dual incision in TC-NER / Gap-filling DNA repair synthesis and ligation in TC-NER / Wnt signaling pathway / positive regulation of protein catabolic process / cellular response to UV / rhythmic process / site of double-strand break / Neddylation / ubiquitin-dependent protein catabolic process / protein-macromolecule adaptor activity / damaged DNA binding / proteasome-mediated ubiquitin-dependent protein catabolic process / chromosome, telomeric region / protein ubiquitination / DNA repair / DNA-templated transcription / apoptotic process / DNA damage response / negative regulation of apoptotic process / protein-containing complex binding / nucleolus / host cell nucleus / protein-containing complex / extracellular space / DNA binding / extracellular exosome / nucleoplasm / nucleus / cytoplasm
Similarity search - Function
Transactivation protein X / Trans-activation protein X / RSE1/DDB1/CPSF1 second beta-propeller / Cleavage/polyadenylation specificity factor, A subunit, C-terminal / Cleavage/polyadenylation specificity factor, A subunit, N-terminal / : / CPSF A subunit region / RSE1/DDB1/CPSF1 first beta-propeller / WD40-repeat-containing domain superfamily / WD40/YVTN repeat-like-containing domain superfamily
Similarity search - Domain/homology
DNA damage-binding protein 1 / Protein X
Similarity search - Component
Biological speciesHomo sapiens (human)
Hepatitis B virus
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.68 Å
AuthorsTanaka, H. / Kita, S. / Sasaki, M. / Maenaka, K. / Machida, S.
Funding support Japan, 5items
OrganizationGrant numberCountry
Other government22T003 Japan
Other government23A1017 Japan
Japan Agency for Medical Research and Development (AMED)JP20ae0101047 Japan
Japan Agency for Medical Research and Development (AMED)JP22ama121037 Japan
Japan Agency for Medical Research and Development (AMED)JP223fa627005 Japan
CitationJournal: Proc Natl Acad Sci U S A / Year: 2025
Title: Structural basis of the hepatitis B virus X protein in complex with DDB1.
Authors: Hiroki Tanaka / Joao Diogo Dias / Basile Jay / Shunsuke Kita / Mina Sasaki / Hiroyuki Takeda / Naoki Kishimoto / Shunsuke Sasaki / Shogo Misumi / Masashi Mizokami / Christine Neuveut / ...Authors: Hiroki Tanaka / Joao Diogo Dias / Basile Jay / Shunsuke Kita / Mina Sasaki / Hiroyuki Takeda / Naoki Kishimoto / Shunsuke Sasaki / Shogo Misumi / Masashi Mizokami / Christine Neuveut / Takashi Sumikama / Mikihiro Shibata / Katsumi Maenaka / Shinichi Machida /
Abstract: A cure for chronic hepatitis B requires eliminating or permanently silencing covalently closed circular DNA (cccDNA). A pivotal target of this approach is the hepatitis B virus (HBV) X protein (HBx), ...A cure for chronic hepatitis B requires eliminating or permanently silencing covalently closed circular DNA (cccDNA). A pivotal target of this approach is the hepatitis B virus (HBV) X protein (HBx), which is a key factor that promotes transcription from cccDNA. However, the HBx structure remains unsolved. Here, we present the cryoelectron microscopy structure of HBx in complex with DDB1, which is an essential complex for cccDNA transcription. In this structure, hydrophobic interactions within HBx were identified, and mutational analysis highlighted their importance in the HBV life cycle. Our biochemical analysis revealed that the HBx-DDB1 complex directly interacts simultaneously with NSE3, which is a component of the SMC5/6 complex, and Spindlin1. Additionally, HBx-DDB1 complex dynamics were explored via high-speed atomic force microscopy. These findings provide comprehensive insights into the structure and function of HBx in HBV replication.
History
DepositionAug 16, 2024Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Jun 4, 2025Provider: repository / Type: Initial release
Revision 1.0Jun 4, 2025Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Jun 4, 2025Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Jun 4, 2025Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Jun 4, 2025Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Jun 4, 2025Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release
Revision 1.1Jun 25, 2025Group: Data collection / Database references
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Revision 1.1Jun 25, 2025Data content type: EM metadata / Data content type: EM metadata / EM metadata / EM metadata
Group: Data processing / Database references / Experimental summary
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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: DNA damage-binding protein 1
B: Protein X


Theoretical massNumber of molelcules
Total (without water)145,8112
Polymers145,8112
Non-polymers00
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 DNA damage-binding protein 1 / DDB p127 subunit / DNA damage-binding protein a / DDBa / Damage-specific DNA-binding protein 1 / ...DDB p127 subunit / DNA damage-binding protein a / DDBa / Damage-specific DNA-binding protein 1 / HBV X-associated protein 1 / XAP-1 / UV-damaged DNA-binding factor / UV-damaged DNA-binding protein 1 / UV-DDB 1 / XPE-binding factor / XPE-BF / Xeroderma pigmentosum group E-complementing protein / XPCe


Mass: 127457.891 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: DDB1, XAP1 / Cell line (production host): Expi293 / Production host: Homo sapiens (human) / References: UniProt: Q16531
#2: Protein Protein X / HBx / Peptide X / pX


Mass: 18353.215 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Hepatitis B virus / Cell line (production host): Expi293 / Production host: Homo sapiens (human) / References: UniProt: Q77UW5
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: the complex of HBx and DDB1 / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human) / Strain: Expi293
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen 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: 2400 nm / Nominal defocus min: 800 nm
Image recordingElectron dose: 53 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)
EM imaging opticsEnergyfilter name: GIF Bioquantum / Energyfilter slit width: 20 eV

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Processing

EM softwareName: PHENIX / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 2.68 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 1368931 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0049102
ELECTRON MICROSCOPYf_angle_d0.87512329
ELECTRON MICROSCOPYf_dihedral_angle_d6.91221
ELECTRON MICROSCOPYf_chiral_restr0.0541424
ELECTRON MICROSCOPYf_plane_restr0.0061587

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