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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：P37028 New Search
11PDB entries
26Biological assembly
28chain/assembly records
Main Difference Dimensions in This Set
Different construct Different mutation/modification Different assembly state Different ligand/ion 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
1N2Z 2.0 Angstrom structure of BtuF, the vitamin B12 binding protein of E. coli Deposited 2002-10-24 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 22–266（245 aa）
Not recorded CD CADMIUM ION × 13 CL CHLORIDE ION × 4 CNC CYANOCOBALAMIN × 1 PG4 TETRAETHYLENE GLYCOL × 1 X-RAY DIFFRACTION mmCIF provides none of the parsed conditions Resolution 2.00 Å R-free 0.210
1N2Z 2.0 Angstrom structure of BtuF, the vitamin B12 binding protein of E. coli Deposited 2002-10-24 Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain B 22–266（245 aa）
Not recorded CD CADMIUM ION × 9 CL CHLORIDE ION × 2 CNC CYANOCOBALAMIN × 1 X-RAY DIFFRACTION mmCIF provides none of the parsed conditions Resolution 2.00 Å R-free 0.210
1N2Z 2.0 Angstrom structure of BtuF, the vitamin B12 binding protein of E. coli Deposited 2002-10-24 Assembly 3 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain A 22–266（245 aa）
Chain B 22–266（245 aa）
Not recorded CD CADMIUM ION × 22 CL CHLORIDE ION × 6 CNC CYANOCOBALAMIN × 2 PG4 TETRAETHYLENE GLYCOL × 1 X-RAY DIFFRACTION mmCIF provides none of the parsed conditions Resolution 2.00 Å R-free 0.210
1N2Z 2.0 Angstrom structure of BtuF, the vitamin B12 binding protein of E. coli Deposited 2002-10-24 Assembly 4 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain A 22–266（245 aa）
Chain B 22–266（245 aa）
Not recorded CD CADMIUM ION × 22 CL CHLORIDE ION × 6 CNC CYANOCOBALAMIN × 2 PG4 TETRAETHYLENE GLYCOL × 1 X-RAY DIFFRACTION mmCIF provides none of the parsed conditions Resolution 2.00 Å R-free 0.210
1N4A The Ligand Bound Structure of E.coli BtuF, the Periplasmic Binding Protein for Vitamin B12 Deposited 2002-10-30 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 23–266（244 aa）
Non-standard monomer：Yes (specific site not provided by mmCIF) CNC CYANOCOBALAMIN × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 4.6；294 K；NaCl, ethanol, acetate, pH 4.6, VAPOR DIFFUSION, HANGING DROP, temperature 294K
Resolution 2.00 Å R-free 0.261
1N4A The Ligand Bound Structure of E.coli BtuF, the Periplasmic Binding Protein for Vitamin B12 Deposited 2002-10-30 Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain B 23–266（244 aa）
Non-standard monomer：Yes (specific site not provided by mmCIF) CNC CYANOCOBALAMIN × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 4.6；294 K；NaCl, ethanol, acetate, pH 4.6, VAPOR DIFFUSION, HANGING DROP, temperature 294K
Resolution 2.00 Å R-free 0.261
1N4D The Ligand-Free Structure of E coli BtuF, the Periplasmic Binding Protein for Vitamin B12 Deposited 2002-10-30 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 23–266（244 aa）
Non-standard monomer：Yes (specific site not provided by mmCIF) No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 4.6；294 K；acetate, PEG4000, (NH4)OAc, pH 4.6, VAPOR DIFFUSION, HANGING DROP, temperature 294K
Resolution 3.00 Å R-free 0.298
1N4D The Ligand-Free Structure of E coli BtuF, the Periplasmic Binding Protein for Vitamin B12 Deposited 2002-10-30 Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain B 23–266（244 aa）
Non-standard monomer：Yes (specific site not provided by mmCIF) No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 4.6；294 K；acetate, PEG4000, (NH4)OAc, pH 4.6, VAPOR DIFFUSION, HANGING DROP, temperature 294K
Resolution 3.00 Å R-free 0.298
2QI9 ABC-transporter BtuCD in complex with its periplasmic binding protein BtuF Deposited 2007-07-03 Assembly 1 Protein heterocomplex Heteromer；Protein × 5 PDB declaration: pentameric（5） Consistent with protein count
Chain F 22–266（245 aa）
Non-standard monomer：Yes (specific site not provided by mmCIF) PO4 PHOSPHATE ION × 2 SO4 SULFATE ION × 6 1PE PENTAETHYLENE GLYCOL × 2 PEG DI(HYDROXYETHYL)ETHER × 4 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 8.4；293 K；30-38% (w/v) polyethylene glycol 400, 50mM either of Tris‑HCl pH 8.4 or Glycine-NaOH pH 9.4 and 400mM (NH4)2SO4., VAPOR DIFFUSION, SITTING DROP, temperature 293K
Resolution 2.60 Å R-free 0.280
4DBL Crystal structure of E159Q mutant of BtuCDF Deposited 2012-01-16 Assembly 1 Protein heterocomplex Heteromer；Protein × 5 PDB declaration: pentameric（5） Consistent with protein count
Chain E 22–266（245 aa）
Not recorded PO4 PHOSPHATE ION × 2 SO4 SULFATE ION × 6 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.4；293 K；0.1M sodium citrate, pH 5.4, 0.3-0.4M ammonium sulphate, 30-35% PEG-400, VAPOR DIFFUSION, SITTING DROP, temperature 293K
Resolution 3.49 Å R-free 0.251
4DBL Crystal structure of E159Q mutant of BtuCDF Deposited 2012-01-16 Assembly 2 Protein heterocomplex Heteromer；Protein × 5 PDB declaration: pentameric（5） Consistent with protein count
Chain J 22–266（245 aa）
Not recorded PO4 PHOSPHATE ION × 2 SO4 SULFATE ION × 6 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.4；293 K；0.1M sodium citrate, pH 5.4, 0.3-0.4M ammonium sulphate, 30-35% PEG-400, VAPOR DIFFUSION, SITTING DROP, temperature 293K
Resolution 3.49 Å R-free 0.251
4FI3 Structure of vitamin B12 transporter BtuCD-F in a nucleotide-bound state Deposited 2012-06-07 Assembly 1 Protein heterocomplex Heteromer；Protein × 5 PDB declaration: pentameric（5） Consistent with protein count
Chain F 22–266（245 aa） Fragment：UNP residues 22-266
Not recorded ANP PHOSPHOAMINOPHOSPHONIC ACID-ADENYLATE ESTER × 2 MG MAGNESIUM ION × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 6.8；293 K；20-30% PEG400, 100 mM ADA pH6.8, 100 mM Na/K-citrate, VAPOR DIFFUSION, SITTING DROP, temperature 293K
Resolution 3.47 Å R-free 0.274
5M29 Structure of cobinamide-bound BtuF, the periplasmic vitamin B12 binding protein in E.coli Deposited 2016-10-12 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 22–266（245 aa）
Non-standard monomer：Yes (specific site not provided by mmCIF) CBY COB(II)INAMIDE × 1 CYN CYANIDE ION × 1 GOL GLYCEROL × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；293.15 K；HEPES sodium pH 7.0 PEG3350 Tryptone
Resolution 1.50 Å R-free 0.213
5M29 Structure of cobinamide-bound BtuF, the periplasmic vitamin B12 binding protein in E.coli Deposited 2016-10-12 Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain B 22–266（245 aa）
Non-standard monomer：Yes (specific site not provided by mmCIF) CBY COB(II)INAMIDE × 1 CYN CYANIDE ION × 2 GOL GLYCEROL × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；293.15 K；HEPES sodium pH 7.0 PEG3350 Tryptone
Resolution 1.50 Å R-free 0.213
5M2Q Structure of cobinamide-bound BtuF mutant W66F, the periplasmic vitamin B12 binding protein in E.coli Deposited 2016-10-13 Assembly 1 Insufficient information Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 22–266（245 aa）
Mutation：W66F CBY COB(II)INAMIDE × 1 CYN CYANIDE ION × 1 GOL GLYCEROL × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；293.15 K；PEG3350 HEPES pH 7 Tryptone
Resolution 1.70 Å R-free 0.249
5M2Q Structure of cobinamide-bound BtuF mutant W66F, the periplasmic vitamin B12 binding protein in E.coli Deposited 2016-10-13 Assembly 2 Insufficient information Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain B 22–266（245 aa）
Mutation：W66F CBY COB(II)INAMIDE × 1 CYN CYANIDE ION × 1 GOL GLYCEROL × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；293.15 K；PEG3350 HEPES pH 7 Tryptone
Resolution 1.70 Å R-free 0.249
5M34 Structure of cobinamide-bound BtuF mutant W66Y, the periplasmic vitamin B12 binding protein in E.coli Deposited 2016-10-14 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 22–266（245 aa）
Not recorded CBY COB(II)INAMIDE × 1 CYN CYANIDE ION × 1 GOL GLYCEROL × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；293.15 K；PEG3350 HEPES pH 7 Tryptone
Resolution 1.60 Å R-free 0.233
5M34 Structure of cobinamide-bound BtuF mutant W66Y, the periplasmic vitamin B12 binding protein in E.coli Deposited 2016-10-14 Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain B 22–266（245 aa）
Not recorded CBY COB(II)INAMIDE × 1 CYN CYANIDE ION × 2 GOL GLYCEROL × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；293.15 K；PEG3350 HEPES pH 7 Tryptone
Resolution 1.60 Å R-free 0.233
5M3B Structure of cobinamide-bound BtuF mutant W66L, the periplasmic vitamin B12 binding protein in E.coli Deposited 2016-10-14 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 22–266（245 aa）
Not recorded CYN CYANIDE ION × 2 CBY COB(II)INAMIDE × 1 GOL GLYCEROL × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；293.15 K；PEG3350 HEPES pH 7 Tryptone
Resolution 1.50 Å R-free 0.229
5M3B Structure of cobinamide-bound BtuF mutant W66L, the periplasmic vitamin B12 binding protein in E.coli Deposited 2016-10-14 Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain B 22–266（245 aa）
Not recorded CYN CYANIDE ION × 1 CBY COB(II)INAMIDE × 1 GOL GLYCEROL × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；293.15 K；PEG3350 HEPES pH 7 Tryptone
Resolution 1.50 Å R-free 0.229
5OVW Nanobody-bound BtuF, the vitamin B12 binding protein in Escherichia coli Deposited 2017-08-30 Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain A 22–266（245 aa）
Not recorded GOL GLYCEROL × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；293.15 K；PEG4000, Tris-HCl, Magnesium chloride
Resolution 2.65 Å R-free 0.259
5OVW Nanobody-bound BtuF, the vitamin B12 binding protein in Escherichia coli Deposited 2017-08-30 Assembly 2 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain B 22–266（245 aa）
Not recorded GOL GLYCEROL × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；293.15 K；PEG4000, Tris-HCl, Magnesium chloride
Resolution 2.65 Å R-free 0.259
5OVW Nanobody-bound BtuF, the vitamin B12 binding protein in Escherichia coli Deposited 2017-08-30 Assembly 3 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain C 22–266（245 aa）
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；293.15 K；PEG4000, Tris-HCl, Magnesium chloride
Resolution 2.65 Å R-free 0.259
5OVW Nanobody-bound BtuF, the vitamin B12 binding protein in Escherichia coli Deposited 2017-08-30 Assembly 4 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain D 22–266（245 aa）
Not recorded GOL GLYCEROL × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；293.15 K；PEG4000, Tris-HCl, Magnesium chloride
Resolution 2.65 Å R-free 0.259
5OVW Nanobody-bound BtuF, the vitamin B12 binding protein in Escherichia coli Deposited 2017-08-30 Assembly 5 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain E 22–266（245 aa）
Not recorded GOL GLYCEROL × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；293.15 K；PEG4000, Tris-HCl, Magnesium chloride
Resolution 2.65 Å R-free 0.259
5OVW Nanobody-bound BtuF, the vitamin B12 binding protein in Escherichia coli Deposited 2017-08-30 Assembly 6 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain F 22–266（245 aa）
Not recorded GOL GLYCEROL × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；293.15 K；PEG4000, Tris-HCl, Magnesium chloride
Resolution 2.65 Å R-free 0.259

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.