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- PDB-8gcn: CRYO-EM STRUCTURE OF IMPORTIN ALPHA1/BETA HETERODIMER -

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Basic information

Entry
Database: PDB / ID: 8gcn
TitleCRYO-EM STRUCTURE OF IMPORTIN ALPHA1/BETA HETERODIMER
Components
  • Importin subunit alpha-1
  • Importin subunit beta-1
KeywordsTRANSPORT PROTEIN / Importins
Function / homology
Function and homology information


RNA import into nucleus / Inhibition of nitric oxide production / mitotic chromosome movement towards spindle pole / endoplasmic reticulum tubular network / Sensing of DNA Double Strand Breaks / regulation of DNA recombination / astral microtubule organization / establishment of mitotic spindle localization / entry of viral genome into host nucleus through nuclear pore complex via importin / positive regulation of viral life cycle ...RNA import into nucleus / Inhibition of nitric oxide production / mitotic chromosome movement towards spindle pole / endoplasmic reticulum tubular network / Sensing of DNA Double Strand Breaks / regulation of DNA recombination / astral microtubule organization / establishment of mitotic spindle localization / entry of viral genome into host nucleus through nuclear pore complex via importin / positive regulation of viral life cycle / Transport of Ribonucleoproteins into the Host Nucleus / Regulation of cholesterol biosynthesis by SREBP (SREBF) / importin-alpha family protein binding / ribosomal protein import into nucleus / Initiation of Nuclear Envelope (NE) Reformation / NS1 Mediated Effects on Host Pathways / NLS-dependent protein nuclear import complex / Apoptosis induced DNA fragmentation / Nuclear import of Rev protein / Postmitotic nuclear pore complex (NPC) reformation / nuclear import signal receptor activity / CREB1 phosphorylation through the activation of CaMKII/CaMKK/CaMKIV cascasde / DNA metabolic process / nuclear localization sequence binding / CaMK IV-mediated phosphorylation of CREB / mitotic metaphase chromosome alignment / NLS-bearing protein import into nucleus / positive regulation of type I interferon production / mitotic spindle assembly / nuclear pore / Assembly of the ORC complex at the origin of replication / Hsp90 protein binding / ISG15 antiviral mechanism / histone deacetylase binding / small GTPase binding / specific granule lumen / cytoplasmic stress granule / protein import into nucleus / SARS-CoV-1 activates/modulates innate immune responses / Interferon alpha/beta signaling / host cell / nuclear envelope / nuclear membrane / Estrogen-dependent gene expression / ficolin-1-rich granule lumen / protein domain specific binding / Golgi membrane / Neutrophil degranulation / endoplasmic reticulum membrane / SARS-CoV-2 activates/modulates innate and adaptive immune responses / enzyme binding / RNA binding / extracellular exosome / zinc ion binding / extracellular region / nucleoplasm / membrane / nucleus / cytosol / cytoplasm
Similarity search - Function
Importin beta family / HEAT-like repeat / Importin-beta N-terminal domain profile. / Importin-beta N-terminal domain / Importin-beta N-terminal domain / Importin-beta, N-terminal domain / Importin subunit alpha / Atypical Arm repeat / Importin-alpha, importin-beta-binding domain superfamily / Importin beta binding domain ...Importin beta family / HEAT-like repeat / Importin-beta N-terminal domain profile. / Importin-beta N-terminal domain / Importin-beta N-terminal domain / Importin-beta, N-terminal domain / Importin subunit alpha / Atypical Arm repeat / Importin-alpha, importin-beta-binding domain superfamily / Importin beta binding domain / Atypical Arm repeat / Importin-alpha, importin-beta-binding domain / IBB domain profile. / HEAT repeat profile. / HEAT, type 2 / Armadillo/plakoglobin ARM repeat profile. / Armadillo/beta-catenin-like repeat / Armadillo/beta-catenin-like repeats / Armadillo / Armadillo-like helical / Armadillo-type fold
Similarity search - Domain/homology
Importin subunit alpha-1 / Importin subunit beta-1
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.95 Å
AuthorsKo, Y. / Cingolani, G.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS) United States
CitationJournal: Sci Adv / Year: 2024
Title: Structural basis for nuclear import of hepatitis B virus (HBV) nucleocapsid core.
Authors: Ruoyu Yang / Ying-Hui Ko / Fenglin Li / Ravi K Lokareddy / Chun-Feng David Hou / Christine Kim / Shelby Klein / Santiago Antolínez / Juan F Marín / Carolina Pérez-Segura / Martin F ...Authors: Ruoyu Yang / Ying-Hui Ko / Fenglin Li / Ravi K Lokareddy / Chun-Feng David Hou / Christine Kim / Shelby Klein / Santiago Antolínez / Juan F Marín / Carolina Pérez-Segura / Martin F Jarrold / Adam Zlotnick / Jodi A Hadden-Perilla / Gino Cingolani /
Abstract: Nuclear import of the hepatitis B virus (HBV) nucleocapsid is essential for replication that occurs in the nucleus. The ~360-angstrom HBV capsid translocates to the nuclear pore complex (NPC) as an ...Nuclear import of the hepatitis B virus (HBV) nucleocapsid is essential for replication that occurs in the nucleus. The ~360-angstrom HBV capsid translocates to the nuclear pore complex (NPC) as an intact particle, hijacking human importins in a reaction stimulated by host kinases. This paper describes the mechanisms of HBV capsid recognition by importins. We found that importin α1 binds a nuclear localization signal (NLS) at the far end of the HBV coat protein Cp183 carboxyl-terminal domain (CTD). This NLS is exposed to the capsid surface through a pore at the icosahedral quasi-sixfold vertex. Phosphorylation at serine-155, serine-162, and serine-170 promotes CTD compaction but does not affect the affinity for importin α1. The binding of 30 importin α1/β1 augments HBV capsid diameter to ~620 angstroms, close to the maximum size trafficable through the NPC. We propose that phosphorylation favors CTD externalization and prompts its compaction at the capsid surface, exposing the NLS to importins.
History
DepositionMar 2, 2023Deposition site: RCSB / Processing site: RCSB
Revision 1.0Mar 6, 2024Provider: repository / Type: Initial release
Revision 1.1Sep 18, 2024Group: Data collection / Database references / Category: citation / citation_author / em_admin
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year / _em_admin.last_update

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Importin subunit beta-1
B: Importin subunit alpha-1


Theoretical massNumber of molelcules
Total (without water)102,5542
Polymers102,5542
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein Importin subunit beta-1 / Importin-90 / Karyopherin subunit beta-1 / Nuclear factor p97 / Pore targeting complex 97 kDa subunit / PTAC97


Mass: 97257.812 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: KPNB1, NTF97 / Production host: Escherichia coli (E. coli) / References: UniProt: Q14974
#2: Protein/peptide Importin subunit alpha-1 / Karyopherin subunit alpha-2 / RAG cohort protein 1 / SRP1-alpha


Mass: 5296.262 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: KPNA2, RCH1, SRP1 / Production host: Escherichia coli (E. coli) / References: UniProt: P52292

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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: Importin Alpha1/Beta Heterodimer / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Escherichia coli (E. coli)
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: FEI TITAN 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: 50 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.20.1_4487: / Classification: refinement
CTF correctionType: NONE
3D reconstructionResolution: 3.95 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 1009142 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0037290
ELECTRON MICROSCOPYf_angle_d0.7599879
ELECTRON MICROSCOPYf_dihedral_angle_d4.343982
ELECTRON MICROSCOPYf_chiral_restr0.041147
ELECTRON MICROSCOPYf_plane_restr0.0041291

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