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- PDB-6n88: Cryo-EM structure of the Importin7:Importin beta:Histone H1.0 complex -

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Basic information

Entry
Database: PDB / ID: 6n88
TitleCryo-EM structure of the Importin7:Importin beta:Histone H1.0 complex
Components
  • Histone H1.0
  • Importin subunit beta-1
  • MGC52556 protein
KeywordsTRANSPORT PROTEIN / Imp7:ImpB:H1.0 / Importin / Histone H1 / nuclear import / disordered interactions
Function / homology
Function and homology information


small GTPase binding => GO:0031267 / RNA import into nucleus / Inhibition of nitric oxide production / mitotic chromosome movement towards spindle pole / endoplasmic reticulum tubular network / establishment of mitotic spindle localization / astral microtubule organization / negative regulation of DNA recombination / Transport of Ribonucleoproteins into the Host Nucleus / Regulation of cholesterol biosynthesis by SREBP (SREBF) ...small GTPase binding => GO:0031267 / RNA import into nucleus / Inhibition of nitric oxide production / mitotic chromosome movement towards spindle pole / endoplasmic reticulum tubular network / establishment of mitotic spindle localization / astral microtubule organization / negative regulation of DNA recombination / Transport of Ribonucleoproteins into the Host Nucleus / Regulation of cholesterol biosynthesis by SREBP (SREBF) / ribosomal protein import into nucleus / importin-alpha family protein binding / NS1 Mediated Effects on Host Pathways / Initiation of Nuclear Envelope (NE) Reformation / positive regulation of transcription regulatory region DNA binding / NLS-dependent protein nuclear import complex / Apoptosis induced DNA fragmentation / Nuclear import of Rev protein / chromosome condensation / Postmitotic nuclear pore complex (NPC) reformation / nucleosomal DNA binding / nuclear import signal receptor activity / nuclear localization sequence binding / Formation of Senescence-Associated Heterochromatin Foci (SAHF) / NLS-bearing protein import into nucleus / mitotic metaphase chromosome alignment / minor groove of adenine-thymine-rich DNA binding / mitotic spindle assembly / heterochromatin formation / nuclear pore / transcription repressor complex / Assembly of the ORC complex at the origin of replication / Hsp90 protein binding / euchromatin / chromatin DNA binding / ISG15 antiviral mechanism / small GTPase binding / nucleosome assembly / cytoplasmic stress granule / protein import into nucleus / structural constituent of chromatin / specific granule lumen / SARS-CoV-1 activates/modulates innate immune responses / nucleosome / Interferon alpha/beta signaling / actin cytoskeleton / nuclear envelope / double-stranded DNA binding / nuclear membrane / ficolin-1-rich granule lumen / nuclear body / protein domain specific binding / chromatin / Neutrophil degranulation / Golgi apparatus / enzyme binding / RNA binding / extracellular exosome / zinc ion binding / extracellular region / nucleoplasm / membrane / nucleus / cytosol / cytoplasm
Similarity search - Function
Exportin-2, central domain / Cse1 / Importin beta family / Linker histone H1/H5 / linker histone H1 and H5 family / Linker histone H1/H5, domain H15 / Linker histone H1/H5 globular (H15) domain profile. / Domain in histone families 1 and 5 / HEAT-like repeat / Importin-beta N-terminal domain profile. ...Exportin-2, central domain / Cse1 / Importin beta family / Linker histone H1/H5 / linker histone H1 and H5 family / Linker histone H1/H5, domain H15 / Linker histone H1/H5 globular (H15) domain profile. / Domain in histone families 1 and 5 / HEAT-like repeat / Importin-beta N-terminal domain profile. / Importin-beta N-terminal domain / Importin-beta N-terminal domain / Importin-beta, N-terminal domain / HEAT repeat profile. / HEAT, type 2 / Armadillo/beta-catenin-like repeat / Armadillo/beta-catenin-like repeats / Armadillo / Armadillo-like helical / Armadillo-type fold / Winged helix DNA-binding domain superfamily / Winged helix-like DNA-binding domain superfamily
Similarity search - Domain/homology
MGC52556 protein / Histone H1.0 / Importin subunit beta-1
Similarity search - Component
Biological speciesXenopus laevis (African clawed frog)
Homo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 6.2 Å
AuthorsBilokapic, S. / Ivic, N. / Halic, M.
Funding supportEuropean Union, Croatia, 2items
OrganizationGrant numberCountry
European Research Council (ERC)ERC-smallRNAhet-309584European Union
European Communitys Seventh Framework ProgrammeNEWFELPRO_26 Croatia
CitationJournal: Mol Cell / Year: 2019
Title: Fuzzy Interactions Form and Shape the Histone Transport Complex.
Authors: Nives Ivic / Mia Potocnjak / Victor Solis-Mezarino / Franz Herzog / Silvija Bilokapic / Mario Halic /
Abstract: Protein transport into the nucleus is mediated by transport receptors. Import of highly charged proteins, such as histone H1 and ribosomal proteins, requires a dimer of two transport receptors. In ...Protein transport into the nucleus is mediated by transport receptors. Import of highly charged proteins, such as histone H1 and ribosomal proteins, requires a dimer of two transport receptors. In this study, we determined the cryo-EM structure of the Imp7:Impβ:H1.0 complex, showing that the two importins form a cradle that accommodates the linker histone. The H1.0 globular domain is bound to Impβ, whereas the acidic loops of Impβ and Imp7 chaperone the positively charged C-terminal tail. Although it remains disordered, the H1 tail serves as a zipper that closes and stabilizes the structure through transient non-specific interactions with importins. Moreover, we found that the GGxxF and FxFG motifs in the Imp7 C-terminal tail are essential for Imp7:Impβ dimerization and H1 import, resembling importin interaction with nucleoporins, which, in turn, promote complex disassembly. The architecture of many other complexes might be similarly defined by rapidly exchanging electrostatic interactions mediated by disordered regions.
History
DepositionNov 28, 2018Deposition site: RCSB / Processing site: RCSB
Revision 1.0Feb 27, 2019Provider: repository / Type: Initial release
Revision 1.1Mar 13, 2019Group: Data collection / Database references
Category: citation / citation_author ...citation / citation_author / em_admin / pdbx_database_proc
Item: _citation.country / _citation.journal_abbrev ..._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
Revision 1.2Apr 3, 2019Group: Data collection / Database references / Category: citation / Item: _citation.journal_volume / _citation.page_first
Revision 1.3Dec 18, 2019Group: Author supporting evidence / Other / Category: atom_sites / pdbx_audit_support
Item: _atom_sites.fract_transf_matrix[1][1] / _atom_sites.fract_transf_matrix[2][2] ..._atom_sites.fract_transf_matrix[1][1] / _atom_sites.fract_transf_matrix[2][2] / _atom_sites.fract_transf_matrix[3][3] / _pdbx_audit_support.country / _pdbx_audit_support.funding_organization
Revision 1.4Mar 20, 2024Group: Data collection / Database references / Category: chem_comp_atom / chem_comp_bond / database_2
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession

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Assembly

Deposited unit
A: MGC52556 protein
B: Importin subunit beta-1
C: Histone H1.0


Theoretical massNumber of molelcules
Total (without water)237,7383
Polymers237,7383
Non-polymers00
Water0
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

#1: Protein MGC52556 protein / RanBP7


Mass: 119553.156 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Xenopus laevis (African clawed frog) / Gene: ipo7, MGC52556 / Production host: Escherichia coli (E. coli) / References: UniProt: O42480
#2: 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
#3: Protein Histone H1.0 / Histone H1' / Histone H1(0)


Mass: 20927.182 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: H1F0, H1FV / Production host: Escherichia coli (E. coli) / References: UniProt: P07305

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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: Imp7:ImpB:H1.0 / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportDetails: unspecified
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 FIELDBright-field microscopy
Image recordingElectron dose: 80 e/Å2 / Film or detector model: GATAN K2 BASE (4k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.11.1_2575: / Classification: refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 6.2 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 18900 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0066500
ELECTRON MICROSCOPYf_angle_d1.9168238
ELECTRON MICROSCOPYf_dihedral_angle_d4.2051866
ELECTRON MICROSCOPYf_chiral_restr0.07364
ELECTRON MICROSCOPYf_plane_restr0.0121620

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