9b4y

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

Method: ELECTRON MICROSCOPY D_max: 102.8 Å Quality: EXCELLENT

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1. Protein Identity and Related Structures Protein Identity & Related Structures

Importin subunit beta-1

Homo sapiens

State in the Current Structure

Assembly	Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Associated Components	Method and Experimental Conditions	Structure Quality
1	Protein heterocomplex Heteromer Protein × 2 PDB declaration: dimeric（2） Consistent with protein copy count	Chain A； UniProt 1–876	Not recorded	Importin subunit alpha-1 × 1 （P52292）	ELECTRON MICROSCOPY cryo-EM buffer：pH 8 cryo-EM vitrification conditions：Cryogen ETHANE	Resolution 3.74 Å

Other States of the Same Protein in the Database

Each row is a biological assembly of the same UniProt protein in another PDB entry. The “Difference from current entry” column identifies evidence-level differences; no tag means the currently parsed fields agree.

Other PDB	Difference from Current Entry 9B4Y	Assembly / Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Non-polymers	Method and Experimental Conditions	Structure Quality
1F59 IMPORTIN-BETA-FXFG NUCLEOPORIN COMPLEX Deposited 2000-06-13	Different construct Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 1–442（442 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.5；293 K；ammonium sulphate, ammonium acetate, dtt, pH 5.5, VAPOR DIFFUSION, HANGING DROP, temperature 20K	Resolution 2.80 Å R-free 0.262
1F59 IMPORTIN-BETA-FXFG NUCLEOPORIN COMPLEX Deposited 2000-06-13	Different construct Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 2 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain B 1–442（442 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.5；293 K；ammonium sulphate, ammonium acetate, dtt, pH 5.5, VAPOR DIFFUSION, HANGING DROP, temperature 20K	Resolution 2.80 Å R-free 0.262
1IBR COMPLEX OF RAN WITH IMPORTIN BETA Deposited 1999-05-14	Different construct Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain B 1–462（462 aa） Fragment：RESIDUES 1-462	Not recorded	MG MAGNESIUM ION × 1 GNP PHOSPHOAMINOPHOSPHONIC ACID-GUANYLATE ESTER × 1	X-RAY DIFFRACTION X-ray crystallization conditions pH 6；pH 6.0	Resolution 2.30 Å R-free 0.272
1IBR COMPLEX OF RAN WITH IMPORTIN BETA Deposited 1999-05-14	Different construct Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 2 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain D 1–462（462 aa） Fragment：RESIDUES 1-462	Not recorded	MG MAGNESIUM ION × 1 GNP PHOSPHOAMINOPHOSPHONIC ACID-GUANYLATE ESTER × 1	X-RAY DIFFRACTION X-ray crystallization conditions pH 6；pH 6.0	Resolution 2.30 Å R-free 0.272
1M5N Crystal structure of HEAT repeats (1-11) of importin b bound to the non-classical NLS(67-94) of PTHrP Deposited 2002-07-09	Different construct Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain S 1–485（485 aa） Fragment：N-terminal domain (Residues 1-485)	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions pH 6；298 K；MES, PEG 4000, sodium chloride, Tween, pH 6, VAPOR DIFFUSION, HANGING DROP, temperature 298.0K, pH 6.00	Resolution 2.90 Å R-free 0.297
1O6O Importin Beta aa1-442 bound to five FxFG repeats from yeast Nsp1p. Second crystal form Deposited 2002-10-10	Different construct Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 1–442（442 aa） Fragment：RESIDUES 1-442	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions pH 5.9；1.2-1.28M AMMONIUM SULPHATE, 100MM AMMONIUM ACETATE, PH 5.9, 30MM DTT	Resolution 2.80 Å R-free 0.273
1O6O Importin Beta aa1-442 bound to five FxFG repeats from yeast Nsp1p. Second crystal form Deposited 2002-10-10	Different construct Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 2 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain B 1–442（442 aa） Fragment：RESIDUES 1-442	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions pH 5.9；1.2-1.28M AMMONIUM SULPHATE, 100MM AMMONIUM ACETATE, PH 5.9, 30MM DTT	Resolution 2.80 Å R-free 0.273
1O6O Importin Beta aa1-442 bound to five FxFG repeats from yeast Nsp1p. Second crystal form Deposited 2002-10-10	Different construct Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 3 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain C 1–442（442 aa） Fragment：RESIDUES 1-442	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions pH 5.9；1.2-1.28M AMMONIUM SULPHATE, 100MM AMMONIUM ACETATE, PH 5.9, 30MM DTT	Resolution 2.80 Å R-free 0.273
1O6P Importin Beta bound to a GLFG Nucleoporin peptide Deposited 2002-10-10	Different construct Different oligomeric state Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain A 1–442（442 aa） Fragment：IMPORTIN BETA-1 SUBUNIT, RESIDUES 1-442	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions pH 6；100MM AMMONIUM ACETATE PH6.0, 1.2M AMMONIUM SULPHATE, pH 6.00	Resolution 2.80 Å R-free 0.267
1O6P Importin Beta bound to a GLFG Nucleoporin peptide Deposited 2002-10-10	Different construct Different oligomeric state Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 2 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain B 1–442（442 aa） Fragment：IMPORTIN BETA-1 SUBUNIT, RESIDUES 1-442	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions pH 6；100MM AMMONIUM ACETATE PH6.0, 1.2M AMMONIUM SULPHATE, pH 6.00	Resolution 2.80 Å R-free 0.267
1QGK STRUCTURE OF IMPORTIN BETA BOUND TO THE IBB DOMAIN OF IMPORTIN ALPHA Deposited 1999-04-29	Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 1–876（876 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions pH 6.5；pH 6.5	Resolution 2.50 Å R-free 0.273
1QGR STRUCTURE OF IMPORTIN BETA BOUND TO THE IBB DOMAIN OF IMPORTIN ALPHA (II CRYSTAL FORM, GROWN AT LOW PH) Deposited 1999-05-04	Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 1–876（876 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions pH 3.9；pH 3.9	Resolution 2.30 Å R-free 0.285
2P8Q Crystal Structure of human Importin beta bound to the Snurportin1 IBB-domain Deposited 2007-03-22	Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 1–876（876 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6；285 K；22%PEG 8000, 0.05M Sodium Chloride, 0.1M MES, pH 6.0, VAPOR DIFFUSION, HANGING DROP, temperature 285K	Resolution 2.35 Å R-free 0.250
2Q5D Crystal Structure of Human Importin Beta bound to the Snurportin1 IBB-domain second crystal form Deposited 2007-05-31	Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 1–876（876 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6；285 K；22%PEG 8000, 0.05M SODIUM CHLORIDE 0.1M MES, pH 6.0, VAPOR DIFFUSION, HANGING DROP, temperature 285K	Resolution 3.20 Å R-free 0.328
2Q5D Crystal Structure of Human Importin Beta bound to the Snurportin1 IBB-domain second crystal form Deposited 2007-05-31	Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 2 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain B 1–876（876 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6；285 K；22%PEG 8000, 0.05M SODIUM CHLORIDE 0.1M MES, pH 6.0, VAPOR DIFFUSION, HANGING DROP, temperature 285K	Resolution 3.20 Å R-free 0.328
2QNA Crystal structure of human Importin-beta (127-876) in complex with the IBB-domain of Snurportin1 (1-65) Deposited 2007-07-18	Different construct Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 127–876（750 aa） Fragment：residues 127-876	Not recorded	SO4 SULFATE ION × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.55；283 K；sodium citrate, Ammonium SO4, Ethanol, NaCl, Tris, pH 5.55, VAPOR DIFFUSION, SITTING DROP, temperature 283K	Resolution 2.84 Å R-free 0.282
3LWW Structure of an open and closed conformation of Human Importin Beta bound to the Snurportin1 IBB-domain trapped in the same crystallographic asymmetric unit Deposited 2010-02-24	Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 1–876（876 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.5；293 K；18% PEG 8000, 50 mM sodium chloride, pH 6.5, VAPOR DIFFUSION, HANGING DROP, temperature 293K	Resolution 3.15 Å R-free 0.313
3LWW Structure of an open and closed conformation of Human Importin Beta bound to the Snurportin1 IBB-domain trapped in the same crystallographic asymmetric unit Deposited 2010-02-24	Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 2 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain C 1–876（876 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.5；293 K；18% PEG 8000, 50 mM sodium chloride, pH 6.5, VAPOR DIFFUSION, HANGING DROP, temperature 293K	Resolution 3.15 Å R-free 0.313
3W5K Crystal structure of Snail1 and importin beta complex Deposited 2013-01-30	Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 1–876（876 aa）	Not recorded	ZN ZINC ION × 4	X-RAY DIFFRACTION mmCIF provides none of the parsed conditions	Resolution 2.60 Å R-free 0.264
6N88 Cryo-EM structure of the Importin7:Importin beta:Histone H1.0 complex Deposited 2018-11-28	Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain B 1–876（876 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY cryo-EM buffer pH 7 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 6.20 Å
6N89 Cryo-EM structure of the Importin beta:Histone H1.0 complex Deposited 2018-11-28	Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 1–876（876 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY cryo-EM buffer pH 7 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 7.50 Å
8GCN CRYO-EM STRUCTURE OF IMPORTIN ALPHA1/BETA HETERODIMER Deposited 2023-03-02	Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 1–876（876 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY cryo-EM buffer pH 8 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.95 Å
9BAW Cryo-EM structure of human importin beta-Ran-GTP heterodimer Deposited 2024-04-04	Different ligand/ion Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 1–876（876 aa）	Not recorded	GTP GUANOSINE-5'-TRIPHOSPHATE × 1 MG MAGNESIUM ION × 1	ELECTRON MICROSCOPY cryo-EM buffer pH 8 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.30 Å
9BFC Cryo-EM structure of importin alpha-1/beta bound to FG repeats Deposited 2024-04-17	Different oligomeric state Different ligand/ion Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 5 PDB declaration: hexameric	Chain H 1–876（876 aa）	Not recorded	PHE PHENYLALANINE × 2 GLY GLYCINE × 1	ELECTRON MICROSCOPY cryo-EM buffer pH 8 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.20 Å
9N85 Cryo-EM structure of human importin beta:Ran-GTP:RanBP1 trimeric complex Deposited 2025-02-07	Different oligomeric state Different ligand/ion Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain A 1–876（876 aa）	Not recorded	GTP GUANOSINE-5'-TRIPHOSPHATE × 1 MG MAGNESIUM ION × 1	ELECTRON MICROSCOPY cryo-EM buffer pH 8 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 2.60 Å
9N86 Cryo-EM structure of human importin beta:importin alpha (IBB) complex Deposited 2025-02-07	Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 1–876（876 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY cryo-EM buffer pH 8 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.30 Å
9N87 Cryo-EM structure of human importin beta: xIBB complex Deposited 2025-02-07	Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 1–876（876 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY cryo-EM buffer pH 8 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.40 Å
9QEJ Cryo-EM structure of the Importin beta:Importin7:Histone H1.0 complex Deposited 2025-03-10	Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain B 1–876（876 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY cryo-EM buffer pH 7 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 6.20 Å
9YB5 Cryo-EM structure of human importin Beta:Ran-GDP:RanBP1 complex Deposited 2025-09-16	Different construct Different oligomeric state Different ligand/ion Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain B 2–459（458 aa）	Not recorded	MG MAGNESIUM ION × 1 GDP GUANOSINE-5'-DIPHOSPHATE × 1	ELECTRON MICROSCOPY cryo-EM buffer pH 8 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.20 Å

22 other PDB entries and 29 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence

UniProt name	IMB1_HUMAN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–876； UniProt 1–876

Importin subunit alpha-1

Homo sapiens

UniProt P52292

State in the Current Structure

Assembly	Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Associated Components	Method and Experimental Conditions	Structure Quality
1	Protein heterocomplex Heteromer Protein × 2 PDB declaration: dimeric（2） Consistent with protein copy count	Chain B； UniProt 11–53	Not recorded	Importin subunit beta-1 × 1 （Q14974）	ELECTRON MICROSCOPY cryo-EM buffer：pH 8 cryo-EM vitrification conditions：Cryogen ETHANE	Resolution 3.74 Å

Other States of the Same Protein in the Database

Other PDB	Difference from Current Entry 9B4Y	Assembly / Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Non-polymers	Method and Experimental Conditions	Structure Quality
1EFX STRUCTURE OF A COMPLEX BETWEEN THE HUMAN NATURAL KILLER CELL RECEPTOR KIR2DL2 AND A CLASS I MHC LIGAND HLA-CW3 Deposited 2000-02-10	Different construct Different oligomeric state Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 5 PDB declaration: pentameric	Chain C 204–212（9 aa） Fragment：RESIDUES 204-212	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.5；298 K；PEG 20000, calcium chloride, sodium cacodylate, pH 6.5, VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 3.00 Å R-free 0.294
1QGK STRUCTURE OF IMPORTIN BETA BOUND TO THE IBB DOMAIN OF IMPORTIN ALPHA Deposited 1999-04-29	Different construct Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain B 11–54（44 aa） Fragment：IBB DOMAIN	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions pH 6.5；pH 6.5	Resolution 2.50 Å R-free 0.273
1QGR STRUCTURE OF IMPORTIN BETA BOUND TO THE IBB DOMAIN OF IMPORTIN ALPHA (II CRYSTAL FORM, GROWN AT LOW PH) Deposited 1999-05-04	Different construct Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain B 28–54（27 aa） Fragment：IBB DOMAIN	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions pH 3.9；pH 3.9	Resolution 2.30 Å R-free 0.285
3FEX Crystal structure of the CBC-importin alpha complex. Deposited 2008-12-01	Different construct Different oligomeric state Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain C 70–529（460 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7；291 K；100 mM KCl, 12% PEG 8000, 100 mM Tris-HCl pH 7.0, VAPOR DIFFUSION, HANGING DROP, temperature 291K	Resolution 3.55 Å R-free 0.292
3FEX Crystal structure of the CBC-importin alpha complex. Deposited 2008-12-01	Different construct Different oligomeric state Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 3 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain C 70–529（460 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7；291 K；100 mM KCl, 12% PEG 8000, 100 mM Tris-HCl pH 7.0, VAPOR DIFFUSION, HANGING DROP, temperature 291K	Resolution 3.55 Å R-free 0.292
3FEY Crystal structure of the CBC-importin alpha complex. Deposited 2008-12-01	Different construct Different oligomeric state Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain C 70–529（460 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6；291 K；100 mM MES, pH 6.0, and 8% PEG 4000 , VAPOR DIFFUSION, HANGING DROP, temperature 291K	Resolution 2.20 Å R-free 0.238
3WPT Crystal structure of closed dimer of human importin-alpha1 (Rch1) Deposited 2014-01-17	Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 75–497（423 aa） Fragment：UNP residues 75-497	Not recorded	PEG DI(HYDROXYETHYL)ETHER × 11	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.5；293 K；50MM MES, 100MM AMMONIUM SULFATE, 10MM MGCL, 15-20%(w/v) PEG8000, pH 5.5, VAPOR DIFFUSION, SITTING DROP, temperature 293K	Resolution 2.63 Å R-free 0.216
3WPT Crystal structure of closed dimer of human importin-alpha1 (Rch1) Deposited 2014-01-17	Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain B 75–497（423 aa） Fragment：UNP residues 75-497	Not recorded	PEG DI(HYDROXYETHYL)ETHER × 6	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.5；293 K；50MM MES, 100MM AMMONIUM SULFATE, 10MM MGCL, 15-20%(w/v) PEG8000, pH 5.5, VAPOR DIFFUSION, SITTING DROP, temperature 293K	Resolution 2.63 Å R-free 0.216
4E4V The crystal structure of the dimeric human importin alpha 1 at 2.5 angstrom resolution. Deposited 2012-03-13	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 70–529（460 aa） Fragment：Importin alpha 1 lacking IBB domain (UNP residues 70-529)	Mutation：K486R	GOL GLYCEROL × 8 DTT 2,3-DIHYDROXY-1,4-DITHIOBUTANE × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.4；298 K；0.5 CITRATE PH 5.4 10 MM DTT, VAPOR DIFFUSION, SITTING DROP, temperature 298K	Resolution 2.53 Å R-free 0.203
4E4V The crystal structure of the dimeric human importin alpha 1 at 2.5 angstrom resolution. Deposited 2012-03-13	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain B 70–529（460 aa） Fragment：Importin alpha 1 lacking IBB domain (UNP residues 70-529)	Mutation：K486R	GOL GLYCEROL × 5 DTT 2,3-DIHYDROXY-1,4-DITHIOBUTANE × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.4；298 K；0.5 CITRATE PH 5.4 10 MM DTT, VAPOR DIFFUSION, SITTING DROP, temperature 298K	Resolution 2.53 Å R-free 0.203
4WV6 Heterodimer of Importin alpha 1 with nuclear localization signal of TAF8 Deposited 2014-11-04	Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain A 60–529（470 aa） Fragment：UNP residues 60-529	Not recorded	EDO 1,2-ETHANEDIOL × 12	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 7.1；281.15 K；HEPES-NaOH, polyethylene glycole 3350, L-proline	Resolution 1.75 Å R-free 0.180
5H43 Structural and mechanistical studies of the nuclear import by Importin-alpha Deposited 2016-10-28	Different construct Different oligomeric state Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain A 70–497（428 aa） Fragment：UNP residues 70-497	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293.15 K；3%(v/v) Tacsimate pH5.0, 0.1M Sodium citrate tribasic dehydrate pH5.6, 16%(w/v) PEG 3350	Resolution 2.30 Å R-free 0.243
7CRU hnRNPK NLS in complex with Importin alpha 1 (KPNA2) Deposited 2020-08-14	Different construct Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 73–529（457 aa）	Not recorded	ACT ACETATE ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.5；293 K；0.1 M Ammonium Acetate, 0.1 M Bis-Tris pH 5.5, 17% w/v PEG 10000	Resolution 2.80 Å R-free 0.240
7CRU hnRNPK NLS in complex with Importin alpha 1 (KPNA2) Deposited 2020-08-14	Different construct Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 2 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain C 73–529（457 aa）	Not recorded	ACT ACETATE ION × 4 GOL GLYCEROL × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.5；293 K；0.1 M Ammonium Acetate, 0.1 M Bis-Tris pH 5.5, 17% w/v PEG 10000	Resolution 2.80 Å R-free 0.240
7N8J Human importin alpha 1 in complex with Bimax2 peptide Deposited 2021-06-15	Different construct Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 76–529（454 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；296 K；0.4 M Ammonium phosphate monobasic	Resolution 3.20 Å R-free 0.244
7N9H Structure of the mammalian importin a1 bound to the TDP-43 NLS Deposited 2021-06-17	Different construct Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain C 70–497（428 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.6；293 K；0.5M sodium citrate, 10 mM mercaptoethanol	Resolution 2.20 Å R-free 0.215
8FZK Dimeric human importin alpha subunit Deposited 2023-01-29	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric	Chain A 71–529（459 aa） Chain B 71–529（459 aa）	Not recorded	MES 2-(N-MORPHOLINO)-ETHANESULFONIC ACID × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7；293 K；14% PEG 8000, 0.2M Magnesium chloride, 0.1M MES	Resolution 2.10 Å R-free 0.247
8FZK Dimeric human importin alpha subunit Deposited 2023-01-29	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 2 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric	Chain C 71–529（459 aa） Chain D 71–529（459 aa）	Not recorded	MG MAGNESIUM ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7；293 K；14% PEG 8000, 0.2M Magnesium chloride, 0.1M MES	Resolution 2.10 Å R-free 0.247
8GCN CRYO-EM STRUCTURE OF IMPORTIN ALPHA1/BETA HETERODIMER Deposited 2023-03-02	Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain B 11–53（43 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY cryo-EM buffer pH 8 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.95 Å
9BFC Cryo-EM structure of importin alpha-1/beta bound to FG repeats Deposited 2024-04-17	Different construct Different oligomeric state Different ligand/ion Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 5 PDB declaration: hexameric	Chain I 1–53（53 aa）	Not recorded	PHE PHENYLALANINE × 2 GLY GLYCINE × 1	ELECTRON MICROSCOPY cryo-EM buffer pH 8 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.20 Å
9N86 Cryo-EM structure of human importin beta:importin alpha (IBB) complex Deposited 2025-02-07	Different construct Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain B 1–53（53 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY cryo-EM buffer pH 8 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.30 Å

16 other PDB entries and 21 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence

UniProt name	IMA1_HUMAN
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain B； PDBConstruct 1–43； UniProt 11–53

The page prioritizes protein identity, the current assembly, associated components, oligomeric state and cross-PDB links. Chain mapping and sequence ranges are retained as data evidence. Internal IDs, import timestamps and assembly operation expressions are maintenance fields and are not shown here.

SAXS scattering curve SAXS Profile

P(r) Distance Distribution P(r) Distribution

Download Download SAXS (.dat) P(r) (.pr.out) CIF

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2. Structure Basics 2. Structure Basics

Entry ID entry_id	9b4y
Deposition date deposition_date	2024-03-21
Structure title title	Cryo-EM structure of importin alpha-1/beta bound to TDP-43
Keywords keywords	Importins, TRANSPORT PROTEIN, TDP-43; TRANSPORT PROTEIN
Experimental Method method	ELECTRON MICROSCOPY

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3. SAXS Parameters (CRYSOL theoretical calculation) 3. SAXS Parameters (CRYSOL)

Radius of gyration Rg (Guinier) rg_guinier	34.26 Å
Radius of gyration Rg (electron density) rg_electron	33.66 Å
Forward intensity I(0) i0	167755000.00
Molecular weight molecular_weight	102460.0 kDa
Excluded volume excluded_volume	128080 Å³
Envelope volume envelope_volume	180440 Å³
Hydration-shell volume shell_volume	44292 Å³
Envelope diameter envelope_diameter	105.3 Å
Shell Rg shell_rg	41.27 Å
Envelope Rg envelope_rg	32.20 Å
Shape Rg shape_rg	33.67 Å
Total Rg total_rg	34.26 Å
Total atoms total_atoms	7178
Residues n_residues	919
Spherical-harmonic order n_harmonics	20
q range q_range	— – 0.5000 Å⁻¹
Data points n_points	101
Shell type shell_type	directional
Solvent electron density solvent_density	0.3340 e/Å³
Shell contrast contrast_shell	0.0300 e/Å³
CRYSOL version crysol_version	4.1.3

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4. P(r) Distance Distribution (GNOM inversion) 4. P(r) Analysis (GNOM)

Maximum dimension Dmax dmax	102.8 Å
Rg (real space) rg_real	34.07 Å
Rg uncertainty (real space) rg_real_error	0.65 Å
I(0) (real space) i0_real	1.6780e+08
I(0) uncertainty (real space) i0_real_error	2.4030e+06
Rg (reciprocal space) rg_reciprocal	34.19 Å
I(0) (reciprocal space) i0_reciprocal	167800000.0000
Solution quality estimate total_estimate	0.9096
Solution quality rating solution_quality	EXCELLENT a EXCELLENT solution
P(r) peaks n_peaks	1
Primary peak position r_peak_primary	49.2 Å
Skewness Skewness skewness	-0.004
Kurtosis Kurtosis kurtosis	-0.702
Angular range angular_range	— – 0.2300 Å⁻¹
Current regularization parameter α current_alpha	0.0000
Highest regularization parameter α highest_alpha	73710000.0000
Real-space data points n_real_points	47
GNOM version gnom_version	4.1.3
Quality Criteria quality_criteria	AN1: 0.000; Oscil: 0.954; Stabil: 1.000; Sysdev: 1.000; Positv: 1.000; Valcen: 0.996; Smooth: 0.962

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5. Crystallography and Experiment 5. Crystallography & Experiment

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6. Entities and Polymers Entities & Polymers (2)

Entity 1 Entity 1 polymer

Description description	Importin subunit beta-1
Molecular weight formula_weight	97323.9 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A
Atom count atom_count	7178

MELITILEKTVSPDRLELEAAQKFLERAAVENLPTFLVELSRVLANPGNSQVARVAAGLQIKNSLTSKDPDIKAQYQQRWLAIDANARREVKNYVLHTLGTETYRPSSASQCVAGIACAEIPVNQWPELIPQLVANVTNPNSTEHMKESTLEAIGYICQDIDPEQLQDKSNEILTAIIQGMRKEEPSNNVKLAATNALLNSLEFTKANFDKESERHFIMQVVCEATQCPDTRVRVAALQNLVKIMSLYYQYMETYMGPALFAITIEAMKSDIDEVALQGIEFWSNVCDEEMDLAIEASEAAEQGRPPEHTSKFYAKGALQYLVPILTQTLTKQDENDDDDDWNPCKAAGVCLMLLATCCEDDIVPHVLPFIKEHIKNPDWRYRDAAVMAFGCILEGPEPSQLKPLVIQAMPTLIELMKDPSVVVRDTAAWTVGRICELLPEAAINDVYLAPLLQCLIEGLSAEPRVASNVCWAFSSLAEAAYEAADVADDQEEPATYCLSSSFELIVQKLLETTDRPDGHQNNLRSSAYESLMEIVKNSAKDCYPAVQKTTLVIMERLQQVLQMESHIQSTSDRIQFNDLQSLLCATLQNVLRKVQHQDALQISDVVMASLLRMFQSTAGSGGVQEDALMAVSTLVEVLGGEFLKYMEAFKPFLGIGLKNYAEYQVCLAAVGLVGDLCRALQSNIIPFCDEVMQLLLENLGNENVHRSVKPQILSVFGDIALAIGGEFKKYLEVVLNTLQQASQAQVDKSDYDMVDYLNELRESCLEAYTGIVQGLKGDQENVHPDVMLVQPRVEFILSFIDHIAGDEDHTDGVVACAAGLIGDLCTAFGKDVLKLVEARPMIHELLTEGRRSKTNKAKTLARWATKELRKLKNQA

来源 Source

来源生物 organism	Homo sapiens
通用名 common_name	human
NCBI Class编号 ncbi_taxonomy_id	9606
宿主生物 host_organism	Escherichia coli

Entity 2 Entity 2 polymer

Description description	Importin subunit alpha-1
Molecular weight formula_weight	5296.3 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	B

AARLHRFKNKGKDSTEMRRRRIEVNVELRKAKKDDQMLKRRNV

来源 Source

来源生物 organism	Homo sapiens
通用名 common_name	human
NCBI Class编号 ncbi_taxonomy_id	9606
宿主生物 host_organism	Escherichia coli

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8. Citations (1)

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Unit-cell length a length_a	1.000 Å
Unit-cell length b length_b	1.000 Å
Unit-cell length c length_c	1.000 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.00 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	—

Space group space_group	P 1
Space-group number int_tables_number	1
Crystal system crystal_system	—

Resolution resolution	3.74 Å
Resolution测定方法 resolution_method	—
颗粒数 num_particles	620000

fit	/app/data/saxs_computation/b4/9b4y/9b4y.fit
pddf	/app/data/pr_computation/b4/9b4y/9b4y.pr.out
profile	/app/data/saxs_computation/b4/9b4y/9b4y.dat

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

1. Protein Identity and Related Structures Protein Identity & Related Structures

Importin subunit beta-1

State in the Current Structure

Other States of the Same Protein in the Database

Importin subunit alpha-1

State in the Current Structure

Other States of the Same Protein in the Database

SAXS scattering curve SAXS Profile

P(r) Distance Distribution P(r) Distribution

2. Structure Basics 2. Structure Basics

3. SAXS Parameters (CRYSOL theoretical calculation) 3. SAXS Parameters (CRYSOL)

4. P(r) Distance Distribution (GNOM inversion) 4. P(r) Analysis (GNOM)

5. Crystallography and Experiment 5. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

冷冻电镜 EM 3D

6. Entities and Polymers Entities & Polymers (2)

Entity 1 Entity 1 polymer

Polymer Polymer

来源 Source

Entity 2 Entity 2 polymer

Polymer Polymer

来源 Source

8. Citations (1)

9. Files and Curves (10)

Files (7)

Curves (3)