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Protein Structures and Oligomeric States

Enter a protein name, UniProt accession or PDB ID. Name searches ask you to confirm the protein identity before related structures are queried.

Current Protein Identity：P04128 New Search
21PDB entries
26Biological assembly
112chain/assembly records
Main Difference Dimensions in This Set
Different construct Different mutation/modification Different assembly state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics

Difference tags compare only the current result set; every original PDB and assembly record remains separate.

Related-Structure Differences

Each row represents one biological assembly in one PDB entry; multiple monomers of the same protein are listed separately.

PDB Entry Assembly / Oligomeric State Construct Mutations and Modifications Ligands, Ions and Non-polymers Experimental Method Experimental Conditions Structure Quality
2JTY Self-complemented variant of FimA, the main subunit of type 1 pilus Deposited 2007-08-09 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 24–182（159 aa） Fragment：Fusion protein of Type-1 fimbrial protein and type-1 fimbrial protein
Chain A 24–42（19 aa） Fragment：Fusion protein of Type-1 fimbrial protein and type-1 fimbrial protein
Not recorded No recorded non-water small molecule SOLUTION NMR
NMR measurement conditions pH 7；298 K；Ionic strength (raw mmCIF value) 18；Pressure ambient
NMR sample composition 1.7 mM [U-98% 13C; U-98% 15N] FimA, 50 M H2O, 5 M D2O, 95% H2O/5% D2O | 95% H2O/5% D2O
Resolution not provided
2M5G Solution structure of FimA wt Deposited 2013-02-24 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 24–182（159 aa）
Not recorded No recorded non-water small molecule SOLUTION NMR
NMR measurement conditions pH 7；298 K；Ionic strength (raw mmCIF value) 0.08；Pressure ambient
NMR sample composition 2 mM [U-99% 13C; U-99% 15N] FimA-1, 90% H2O/10% D2O | 90% H2O/10% D2O
Resolution not provided
3SQB Structure of the major type 1 pilus subunit FimA bound to the FimC chaperone Deposited 2011-07-05 Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain B 37–182（146 aa） Fragment：UNP residues 37-182
Not recorded PEG DI(HYDROXYETHYL)ETHER × 3 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.5；277 K；0.1 M sodium acetate, 0.2 M magnesium chloride, 13% PEG 4000, pH 5.5, VAPOR DIFFUSION, SITTING DROP, temperature 277K
Resolution 3.20 Å R-free 0.300
3SQB Structure of the major type 1 pilus subunit FimA bound to the FimC chaperone Deposited 2011-07-05 Assembly 2 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain D 37–182（146 aa） Fragment：UNP residues 37-182
Not recorded EDO 1,2-ETHANEDIOL × 2 TRS 2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.5；277 K；0.1 M sodium acetate, 0.2 M magnesium chloride, 13% PEG 4000, pH 5.5, VAPOR DIFFUSION, SITTING DROP, temperature 277K
Resolution 3.20 Å R-free 0.300
3SQB Structure of the major type 1 pilus subunit FimA bound to the FimC chaperone Deposited 2011-07-05 Assembly 3 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain F 37–182（146 aa） Fragment：UNP residues 37-182
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.5；277 K；0.1 M sodium acetate, 0.2 M magnesium chloride, 13% PEG 4000, pH 5.5, VAPOR DIFFUSION, SITTING DROP, temperature 277K
Resolution 3.20 Å R-free 0.300
3SQB Structure of the major type 1 pilus subunit FimA bound to the FimC chaperone Deposited 2011-07-05 Assembly 4 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain H 37–182（146 aa） Fragment：UNP residues 37-182
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.5；277 K；0.1 M sodium acetate, 0.2 M magnesium chloride, 13% PEG 4000, pH 5.5, VAPOR DIFFUSION, SITTING DROP, temperature 277K
Resolution 3.20 Å R-free 0.300
4DWH Structure of the major type 1 pilus subunit FIMA bound to the FIMC (2.5 A resolution) Deposited 2012-02-24 Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain B 41–182（142 aa）
Not recorded PEG DI(HYDROXYETHYL)ETHER × 7 PG4 TETRAETHYLENE GLYCOL × 1 PO4 PHOSPHATE ION × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；293 K；40% (v/v) PEG 400 0.1 M phosphate/citrate pH 4.2 , VAPOR DIFFUSION, SITTING DROP, temperature 293K
Resolution 2.50 Å R-free 0.294
4DWH Structure of the major type 1 pilus subunit FIMA bound to the FIMC (2.5 A resolution) Deposited 2012-02-24 Assembly 2 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain D 41–182（142 aa）
Not recorded PEG DI(HYDROXYETHYL)ETHER × 3 PG4 TETRAETHYLENE GLYCOL × 1 PGE TRIETHYLENE GLYCOL × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；293 K；40% (v/v) PEG 400 0.1 M phosphate/citrate pH 4.2 , VAPOR DIFFUSION, SITTING DROP, temperature 293K
Resolution 2.50 Å R-free 0.294
5NKT FimA wt from E. coli Deposited 2017-04-03 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 24–182（159 aa）
Not recorded SO4 SULFATE ION × 4 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 2.6；277 K；0.1 M Sodium Malonate, pH 2.6, 45% ammonium sulphate, 23 mg/ml of protein 1:1 mixture with reservoir
Resolution 1.50 Å R-free 0.188
5OH0 The Cryo-Electron Microscopy Structure of the Type 1 Chaperone-Usher Pilus Rod Deposited 2017-07-13 Assembly 1 Protein homooligomer Homooligomer；Protein × 6 PDB declaration: hexameric（6） Consistent with protein count
Chain A 24–182（159 aa）
Chain B 24–182（159 aa）
Chain C 24–182（159 aa）
Chain D 24–182（159 aa）
Chain E 24–182（159 aa）
Chain F 24–182（159 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 4.20 Å
6C53 Cryo-EM structure of the Type 1 pilus rod Deposited 2018-01-13 Assembly 1 Protein homooligomer Homooligomer；Protein × 11 PDB declaration: undecameric（11） Consistent with protein count
Chain A 24–182（159 aa）
Chain B 24–182（159 aa）
Chain C 24–182（159 aa）
Chain D 24–182（159 aa）
Chain E 24–182（159 aa）
Chain F 24–182（159 aa）
Chain G 24–182（159 aa）
Chain H 24–182（159 aa）
Chain I 24–182（159 aa）
Chain J 24–182（159 aa）
Chain K 24–182（159 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 4.20 Å
6R74 N-terminally reversed variant of FimA E. coli Deposited 2019-03-28 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 42–182（141 aa）
Not recorded SO4 SULFATE ION × 5 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 3.1；298 K；45% NH4SO2 and 0.1M Sodium Malonate buffer pH 3.1
Resolution 1.81 Å R-free 0.219
6SWH Crystal structure of the ternary complex between the type 1 pilus proteins FimC, FimI and FimA from E. coli Deposited 2019-09-20 Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric（3） Consistent with protein count
Chain C 37–182（146 aa）
Not recorded PEG DI(HYDROXYETHYL)ETHER × 1 EDO 1,2-ETHANEDIOL × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION；293 K；0.8 M sodium formate, 100 mM Tris/acetic acid pH 8.5, 16% PEG 4000 (w/v)
Resolution 2.80 Å R-free 0.207
6SWH Crystal structure of the ternary complex between the type 1 pilus proteins FimC, FimI and FimA from E. coli Deposited 2019-09-20 Assembly 2 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric（3） Consistent with protein count
Chain F 37–182（146 aa）
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION；293 K；0.8 M sodium formate, 100 mM Tris/acetic acid pH 8.5, 16% PEG 4000 (w/v)
Resolution 2.80 Å R-free 0.207
6Y7S 2.85 A cryo-EM structure of the in vivo assembled type 1 pilus rod Deposited 2020-03-02 Assembly 1 Protein homooligomer Homooligomer；Protein × 6 PDB declaration: hexameric（6） Consistent with protein count
Chain A 1–182（182 aa）
Chain B 1–182（182 aa）
Chain C 1–182（182 aa）
Chain D 1–182（182 aa）
Chain E 1–182（182 aa）
Chain F 1–182（182 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 7；in ddH2O.
cryo-EM vitrification conditions Cryogen ETHANE；3 ul sample, 30 s wait time, 0.5 s drain time, 6 s blotting
Resolution 2.85 Å R-free 0.275
8PSV 2.7 A cryo-EM structure of in vitro assembled type 1 pilus rod Deposited 2023-07-13 Assembly 1 Protein homooligomer Homooligomer；Protein × 6 PDB declaration: hexameric（6） Consistent with protein count
Chain A 1–182（182 aa）
Chain B 1–182（182 aa）
Chain C 1–182（182 aa）
Chain D 1–182（182 aa）
Chain E 1–182（182 aa）
Chain F 1–182（182 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 7；in ddH2O.
cryo-EM vitrification conditions Cryogen ETHANE；3 ul sample, 30 s wait time, 0.5 s drain time, 6 s blotting
Resolution 2.70 Å
8PTU 2.5 A cryo-EM structure of the in vitro FimD-catalyzed assembly of type 1 pilus rod Deposited 2023-07-14 Assembly 1 Protein homooligomer Homooligomer；Protein × 6 PDB declaration: hexameric（6） Consistent with protein count
Chain A 1–182（182 aa）
Chain B 1–182（182 aa）
Chain C 1–182（182 aa）
Chain D 1–182（182 aa）
Chain E 1–182（182 aa）
Chain F 1–182（182 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 7；in ddH2O.
cryo-EM vitrification conditions Cryogen ETHANE；3 ul sample, 30 s wait time, 0.5 s drain time, 6 s blotting
Resolution 2.52 Å
9FTT Cryo-EM structure of the type 1 pilus rod as part of the FimA-bound usher complex (FimDHGFAnC) Deposited 2024-06-25 Assembly 1 Protein homooligomer Homooligomer；Protein × 10 PDB declaration: decameric（10） Consistent with protein count
Chain B 24–182（159 aa）
Chain C 24–182（159 aa）
Chain D 24–182（159 aa）
Chain E 24–182（159 aa）
Chain F 24–182（159 aa）
Chain G 24–182（159 aa）
Chain H 24–182（159 aa）
Chain I 24–182（159 aa）
Chain J 24–182（159 aa）
Chain K 24–182（159 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 3.60 Å
9FW9 Cryo-EM structure of the type 1 pilus assembly platform as part of the FimA-bound chaperone-usher pilus complex (FimDHGFAnC - body 2) Deposited 2024-06-28 Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain A 24–182（159 aa）
Chain B 24–182（159 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 3.90 Å
9FWB Cryo-EM structure of the type 1 pilus assembly platform as part of the FimA-bound chaperone-usher pilus complex (Local refinement including FimD, FimC, FimAn and FimAn-1) Deposited 2024-06-28 Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain A 24–182（159 aa）
Chain B 24–182（159 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 3.50 Å
9FWZ Cryo-EM structure of the type 1 pilus assembly platform as part of the FimA-bound chaperone-usher pilus complex (Local refinement including FimD, FimC, FimAn, FimAn-1 and FimAn-2) Deposited 2024-07-01 Assembly 1 Protein heterocomplex Heteromer；Protein × 5 PDB declaration: pentameric（5） Consistent with protein count
Chain A 24–182（159 aa）
Chain B 24–182（159 aa）
Chain E 24–182（159 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 3.60 Å
9FX0 Cryo-EM structure of the type 1 pilus tip-to-rod transition Deposited 2024-07-01 Assembly 1 Protein heterocomplex Heteromer；Protein × 7 PDB declaration: heptameric（7） Consistent with protein count
Chain A 24–182（159 aa）
Chain B 24–182（159 aa）
Chain C 24–182（159 aa）
Chain D 24–182（159 aa）
Chain E 24–182（159 aa）
Chain G 24–182（159 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 3.10 Å
9FXA Cryo-EM structure of the type 1 pilus rod as part of the FimI-bound usher complex (FimDHGFAnIC - body 1) Deposited 2024-07-01 Assembly 1 Protein homooligomer Homooligomer；Protein × 10 PDB declaration: decameric（10） Consistent with protein count
Chain B 24–182（159 aa）
Chain C 24–182（159 aa）
Chain D 24–182（159 aa）
Chain E 24–182（159 aa）
Chain F 24–182（159 aa）
Chain G 24–182（159 aa）
Chain H 24–182（159 aa）
Chain I 24–182（159 aa）
Chain J 24–182（159 aa）
Chain K 24–182（159 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 4.00 Å
9FXB Cryo-EM structure of the type 1 pilus assembly platform as part of the FimI-bound chaperone-usher pilus complex (FimDHGFAnIC - body 2) Deposited 2024-07-01 Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain A 24–182（159 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 4.30 Å
9VKV Cryo-EM structure of the type I pilus from Escherichia Coli and the surrounding water network Deposited 2025-06-24 Assembly 1 Protein homooligomer Homooligomer；Protein × 15 PDB declaration: pentadecameric（15） Consistent with protein count
Chain A 24–182（159 aa）
Chain B 24–182（159 aa）
Chain C 24–182（159 aa）
Chain D 24–182（159 aa）
Chain E 24–182（159 aa）
Chain F 24–182（159 aa）
Chain G 24–182（159 aa）
Chain H 24–182（159 aa）
Chain I 24–182（159 aa）
Chain J 24–182（159 aa）
Chain K 24–182（159 aa）
Chain L 24–182（159 aa）
Chain M 24–182（159 aa）
Chain N 24–182（159 aa）
Chain O 24–182（159 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen NITROGEN
Resolution 2.09 Å
9X67 Cryo-EM structure of the type I pilus from Escherichia Coli and the surrounding water network Deposited 2025-10-15 Assembly 1 Protein homooligomer Homooligomer；Protein × 15 PDB declaration: 15-meric（15） Consistent with protein count
Chain A 24–182（159 aa）
Chain B 24–182（159 aa）
Chain C 24–182（159 aa）
Chain D 24–182（159 aa）
Chain E 24–182（159 aa）
Chain F 24–182（159 aa）
Chain G 24–182（159 aa）
Chain H 24–182（159 aa）
Chain I 24–182（159 aa）
Chain J 24–182（159 aa）
Chain K 24–182（159 aa）
Chain L 24–182（159 aa）
Chain M 24–182（159 aa）
Chain N 24–182（159 aa）
Chain O 24–182（159 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen NITROGEN
Resolution 1.85 Å

This page presents structural evidence recorded in PDB/mmCIF.“No recorded non-water small molecule” does not prove that the experimental sample was ligand-free; experimental conditions belong to the PDB experiment, while ligands and copy counts are shown for each biological assembly.