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- EMDB-49116: Cryo-EM structure of human importin beta:importin alpha (IBB) complex -

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Basic information

Entry
Database: EMDB / ID: EMD-49116
TitleCryo-EM structure of human importin beta:importin alpha (IBB) complex
Map data
Sample
  • Complex: Importin Beta/RanGTP/RanBP1 complex
    • Protein or peptide: Importin subunit beta-1
    • Protein or peptide: Importin subunit alpha-1
KeywordsImportins / TRANSPORT PROTEIN / Ran / RanBP1
Function / homology
Function and homology information


RNA import into nucleus / Inhibition of nitric oxide production / mitotic chromosome movement towards spindle pole / Sensing of DNA Double Strand Breaks / endoplasmic reticulum tubular network / regulation of DNA recombination / astral microtubule organization / entry of viral genome into host nucleus through nuclear pore complex via importin / establishment of mitotic spindle localization / positive regulation of viral life cycle ...RNA import into nucleus / Inhibition of nitric oxide production / mitotic chromosome movement towards spindle pole / Sensing of DNA Double Strand Breaks / endoplasmic reticulum tubular network / regulation of DNA recombination / astral microtubule organization / entry of viral genome into host nucleus through nuclear pore complex via importin / establishment of mitotic spindle localization / 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 / NS1 Mediated Effects on Host Pathways / NLS-dependent protein nuclear import complex / NLS-bearing protein import into nucleus / Apoptosis induced DNA fragmentation / nuclear localization sequence binding / Initiation of Nuclear Envelope (NE) Reformation / Nuclear import of Rev protein / ribosomal protein import into nucleus / Postmitotic nuclear pore complex (NPC) reformation / nuclear import signal receptor activity / CREB1 phosphorylation through the activation of CaMKII/CaMKK/CaMKIV cascasde / CaMK IV-mediated phosphorylation of CREB / mitotic metaphase chromosome alignment / DNA metabolic process / mitotic spindle assembly / positive regulation of type I interferon production / nuclear pore / Assembly of the ORC complex at the origin of replication / Hsp90 protein binding / positive regulation of cholesterol biosynthetic process / small GTPase binding / ISG15 antiviral mechanism / histone deacetylase binding / specific granule lumen / cytoplasmic stress granule / protein import into nucleus / SARS-CoV-1 activates/modulates innate immune responses / Interferon alpha/beta signaling / nuclear envelope / host cell / 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 / extracellular region / zinc ion binding / nucleoplasm / nucleus / membrane / cytosol / cytoplasm
Similarity search - Function
Importin beta family / HEAT-like repeat / Importin subunit alpha / Atypical Arm repeat / Importin-alpha, importin-beta-binding domain superfamily / Importin beta binding domain / Atypical Arm repeat / Importin-beta N-terminal domain / Importin-beta N-terminal domain / Importin-beta N-terminal domain profile. ...Importin beta family / HEAT-like repeat / Importin subunit alpha / Atypical Arm repeat / Importin-alpha, importin-beta-binding domain superfamily / Importin beta binding domain / Atypical Arm repeat / Importin-beta N-terminal domain / Importin-beta N-terminal domain / Importin-beta N-terminal domain profile. / Importin-beta, N-terminal domain / 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)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.3 Å
AuthorsKo Y / Cingolani G / Suinn S
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS) United States
CitationJournal: To Be Published
Title: Cryo-EM structure of human importin beta-Ran-GTP heterodimer
Authors: Ko Y / Cingolani G
History
DepositionFeb 7, 2025-
Header (metadata) releaseDec 10, 2025-
Map releaseDec 10, 2025-
UpdateDec 10, 2025-
Current statusDec 10, 2025Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_49116.png

Downloads & links

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Map

FileDownload / File: emd_49116.map.gz / Format: CCP4 / Size: 125 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.74 Å/pix.
x 320 pix.
= 236.8 Å		0.74 Å/pix.
x 320 pix.
= 236.8 Å		0.74 Å/pix.
x 320 pix.
= 236.8 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.74 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.0691
Minimum - Maximum-0.11378464 - 0.2216152
Average (Standard dev.)0.00053770846 (±0.006636449)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions320320320
Spacing320320320
CellA=B=C: 236.8 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #1

Fileemd_49116_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #2

Fileemd_49116_half_map_2.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Importin Beta/RanGTP/RanBP1 complex

EntireName: Importin Beta/RanGTP/RanBP1 complex
Components
  • Complex: Importin Beta/RanGTP/RanBP1 complex
    • Protein or peptide: Importin subunit beta-1
    • Protein or peptide: Importin subunit alpha-1

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Supramolecule #1: Importin Beta/RanGTP/RanBP1 complex

SupramoleculeName: Importin Beta/RanGTP/RanBP1 complex / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Importin subunit beta-1

MacromoleculeName: Importin subunit beta-1 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 97.257812 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MELITILEKT VSPDRLELEA AQKFLERAAV ENLPTFLVEL SRVLANPGNS QVARVAAGLQ IKNSLTSKDP DIKAQYQQRW LAIDANARR EVKNYVLQTL GTETYRPSSA SQCVAGIACA EIPVNQWPEL IPQLVANVTN PNSTEHMKES TLEAIGYICQ D IDPEQLQD ...String:
MELITILEKT VSPDRLELEA AQKFLERAAV ENLPTFLVEL SRVLANPGNS QVARVAAGLQ IKNSLTSKDP DIKAQYQQRW LAIDANARR EVKNYVLQTL GTETYRPSSA SQCVAGIACA EIPVNQWPEL IPQLVANVTN PNSTEHMKES TLEAIGYICQ D IDPEQLQD KSNEILTAII QGMRKEEPSN NVKLAATNAL LNSLEFTKAN FDKESERHFI MQVVCEATQC PDTRVRVAAL QN LVKIMSL YYQYMETYMG PALFAITIEA MKSDIDEVAL QGIEFWSNVC DEEMDLAIEA SEAAEQGRPP EHTSKFYAKG ALQ YLVPIL TQTLTKQDEN DDDDDWNPCK AAGVCLMLLA TCCEDDIVPH VLPFIKEHIK NPDWRYRDAA VMAFGCILEG PEPS QLKPL VIQAMPTLIE LMKDPSVVVR DTAAWTVGRI CELLPEAAIN DVYLAPLLQC LIEGLSAEPR VASNVCWAFS SLAEA AYEA ADVADDQEEP ATYCLSSSFE LIVQKLLETT DRPDGHQNNL RSSAYESLME IVKNSAKDCY PAVQKTTLVI MERLQQ VLQ MESHIQSTSD RIQFNDLQSL LCATLQNVLR KVQHQDALQI SDVVMASLLR MFQSTAGSGG VQEDALMAVS TLVEVLG GE FLKYMEAFKP FLGIGLKNYA EYQVCLAAVG LVGDLCRALQ SNIIPFCDEV MQLLLENLGN ENVHRSVKPQ ILSVFGDI A LAIGGEFKKY LEVVLNTLQQ ASQAQVDKSD YDMVDYLNEL RESCLEAYTG IVQGLKGDQE NVHPDVMLVQ PRVEFILSF IDHIAGDEDH TDGVVACAAG LIGDLCTAFG KDVLKLVEAR PMIHELLTEG RRSKTNKAKT LATWATKELR KLKNQA

UniProtKB: Importin subunit beta-1

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Macromolecule #2: Importin subunit alpha-1

MacromoleculeName: Importin subunit alpha-1 / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 6.356357 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
MSTNENANTP AARLHRFKNK GKDSTEMRRR RIEVNVELRK AKKDDQMLKR RNV

UniProtKB: Importin subunit alpha-1

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration1.0 mg/mL
BufferpH: 8
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: FEI FALCON IV (4k x 4k) / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.4 µm / Nominal defocus min: 0.8 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionType: NONE
Startup modelType of model: PDB ENTRY
PDB model - PDB ID:

1qgk

Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.3 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 157234
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD

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