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- EMDB-44191: Cryo-EM structure of importin alpha-1/beta bound to TDP-43 -

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Basic information

Entry
Database: EMDB / ID: EMD-44191
TitleCryo-EM structure of importin alpha-1/beta bound to TDP-43
Map data
Sample
  • Complex: Importin Alpha1/Beta/TDP-43 trimeric complex
    • Protein or peptide: Importin subunit beta-1
    • Protein or peptide: Importin subunit alpha-1
KeywordsImportins / TRANSPORT PROTEIN / TDP-43
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 / importin-alpha family protein binding / astral microtubule organization / establishment of mitotic spindle localization / entry of viral genome into host nucleus through nuclear pore complex via importin ...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 / importin-alpha family protein binding / 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) / NS1 Mediated Effects on Host Pathways / NLS-dependent protein nuclear import complex / NLS-bearing protein import into nucleus / Apoptosis induced DNA fragmentation / Initiation of Nuclear Envelope (NE) Reformation / nuclear localization sequence binding / ribosomal protein import into nucleus / 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 / CaMK IV-mediated phosphorylation of CREB / DNA metabolic process / mitotic metaphase chromosome alignment / 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 / protein import into nucleus / cytoplasmic stress granule / 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-beta N-terminal domain / Importin-beta N-terminal domain / Importin-beta N-terminal domain profile. / 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 / Importin-beta N-terminal domain / Importin-beta N-terminal domain profile. / 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)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.74 Å
AuthorsKo Y / Cingolani G
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 importin alpha-1/beta bound to TDP-43
Authors: Ko Y / Cingolani G
History
DepositionMar 21, 2024-
Header (metadata) releaseMar 26, 2025-
Map releaseMar 26, 2025-
UpdateMay 28, 2025-
Current statusMay 28, 2025Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_44191.png

Downloads & links

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Map

FileDownload / File: emd_44191.map.gz / Format: CCP4 / Size: 30.5 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.87 Å/pix.
x 200 pix.
= 174.4 Å		0.87 Å/pix.
x 200 pix.
= 174.4 Å		0.87 Å/pix.
x 200 pix.
= 174.4 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.872 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.1
Minimum - Maximum-0.12401053 - 0.31337827
Average (Standard dev.)0.0018047178 (±0.01800079)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions200200200
Spacing200200200
CellA=B=C: 174.4 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #2

Fileemd_44191_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #1

Fileemd_44191_half_map_2.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
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Histogram

Histogram (log scale)

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Sample components

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Entire : Importin Alpha1/Beta/TDP-43 trimeric complex

EntireName: Importin Alpha1/Beta/TDP-43 trimeric complex
Components
  • Complex: Importin Alpha1/Beta/TDP-43 trimeric complex
    • Protein or peptide: Importin subunit beta-1
    • Protein or peptide: Importin subunit alpha-1

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Supramolecule #1: Importin Alpha1/Beta/TDP-43 trimeric complex

SupramoleculeName: Importin Alpha1/Beta/TDP-43 trimeric 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: 97.323922 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MELITILEKT VSPDRLELEA AQKFLERAAV ENLPTFLVEL SRVLANPGNS QVARVAAGLQ IKNSLTSKDP DIKAQYQQRW LAIDANARR EVKNYVLHTL GTETYRPSSA SQCVAGIACA EIPVNQWPEL IPQLVANVTN PNSTEHMKES TLEAIGYICQ D IDPEQLQD ...String:
MELITILEKT VSPDRLELEA AQKFLERAAV ENLPTFLVEL SRVLANPGNS QVARVAAGLQ IKNSLTSKDP DIKAQYQQRW LAIDANARR EVKNYVLHTL 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 LARWATKELR 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: 5.296262 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
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

Concentration2.0 mg/mL
BufferpH: 8
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Number real images: 6400 / 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 / 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: 3.74 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 620000
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD

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