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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：P06129 New Search
13PDB entries
13Biological assembly
13chain/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
1NQE OUTER MEMBRANE COBALAMIN TRANSPORTER (BTUB) FROM E. COLI Deposited 2003-01-21 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 21–614（594 aa）
Not recorded MG MAGNESIUM ION × 1 C8E (HYDROXYETHYLOXY)TRI(ETHYLOXY)OCTANE × 7 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 6.6；293 K；PEG 3350, magnesium acetate, bis-tris, n-octyl tetraoxyethylene , pH 6.6, VAPOR DIFFUSION, SITTING DROP, temperature 293K
Resolution 2.00 Å R-free 0.232
1NQF OUTER MEMBRANE COBALAMIN TRANSPORTER (BTUB) FROM E. COLI, METHIONINE SUBSTIUTION CONSTRUCT FOR SE-MET SAD PHASING Deposited 2003-01-21 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 21–614（594 aa）
Mutation：W317M, K319M, T321M, W516M, I518M, Y520M Non-standard monomer：Yes (specific site not provided by mmCIF) MG MAGNESIUM ION × 1 C8E (HYDROXYETHYLOXY)TRI(ETHYLOXY)OCTANE × 6 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 6.6；293 K；PEG3350, MAGNESIUM ACETATE, BIS-TRIS, N-OCTYL TETRAOXYETHELYENE, tris-(2-carboxyethyl)phosphine hydrochloride , pH 6.6, VAPOR DIFFUSION, SITTING DROP, temperature 293K
Resolution 2.70 Å R-free 0.288
1NQG OUTER MEMBRANE COBALAMIN TRANSPORTER (BTUB) FROM E. COLI, WITH BOUND CALCIUM Deposited 2003-01-21 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 21–614（594 aa）
Not recorded CA CALCIUM ION × 4 C8E (HYDROXYETHYLOXY)TRI(ETHYLOXY)OCTANE × 6 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 6.6；293 K；PEG 3350, MAGNESIUM ACETATE, BIS-TRIS, N-OCTYL TETRAOXYETHYLENE, pH 6.6, VAPOR DIFFUSION, SITTING DROP, temperature 293K
Resolution 3.31 Å R-free 0.259
1NQH OUTER MEMBRANE COBALAMIN TRANSPORTER (BTUB) FROM E. COLI, WITH BOUND CALCIUM AND CYANOCOBALAMIN (VITAMIN B12) SUBSTRATE Deposited 2003-01-21 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 21–614（594 aa）
Not recorded CA CALCIUM ION × 4 CNC CYANOCOBALAMIN × 1 C8E (HYDROXYETHYLOXY)TRI(ETHYLOXY)OCTANE × 6 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 6.6；293 K；PEG 3350, MAGNESIUM ACETATE, BIS-TRIS, N-OCTYL TETRAOXYETHYLENE, pH 6.6, VAPOR DIFFUSION, SITTING DROP, temperature 293K
Resolution 3.10 Å R-free 0.265
1UJW Structure of the complex between BtuB and Colicin E3 Receptor binding domain Deposited 2003-08-12 Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain A 21–614（594 aa）
Not recorded GP1 2-amino-2-deoxy-1-O-phosphono-alpha-D-glucopyranose × 2 LIM 3-OXO-PENTADECANOIC ACID × 2 LDA LAURYL DIMETHYLAMINE-N-OXIDE × 7 AAE ACETOACETIC ACID × 1 GOL GLYCEROL × 8 X-RAY DIFFRACTION mmCIF provides none of the parsed conditions Resolution 2.75 Å R-free 0.293
2GSK Structure of the BtuB:TonB Complex Deposited 2006-04-26 Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain A 25–614（590 aa）
Not recorded CA CALCIUM ION × 2 CNC CYANOCOBALAMIN × 1 LDA LAURYL DIMETHYLAMINE-N-OXIDE × 4 OCT N-OCTANE × 3 HEX HEXANE × 2 X-RAY DIFFRACTION
X-ray crystallization conditions pH 5.1；288 K；30% (v/v) PEG 300, 0.1M sodium acetate , pH 5.1, VAPOR DIFFUSION, SITTING DROP, temperature 288K, pH 5.10
Resolution 2.10 Å R-free 0.251
2GUF In meso crystal structure of the cobalamin transporter, BtuB Deposited 2006-04-29 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 21–614（594 aa）
Not recorded MPG [(Z)-octadec-9-enyl] (2R)-2,3-bis(oxidanyl)propanoate × 11 FMT FORMIC ACID × 1 MPD (4S)-2-METHYL-2,4-PENTANEDIOL × 4 X-RAY DIFFRACTION mmCIF provides none of the parsed conditions Resolution 1.95 Å R-free 0.225
2YSU Structure of the complex between BtuB and Colicin E2 receptor binding domain Deposited 2007-04-04 Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain A 21–614（594 aa）
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION mmCIF provides none of the parsed conditions Resolution 3.50 Å R-free 0.315
3M8B Crystal structure of spin-labeled BtuB V10R1 in the apo state Deposited 2010-03-17 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 21–614（594 aa）
Mutation：V10R1A C8E (HYDROXYETHYLOXY)TRI(ETHYLOXY)OCTANE × 7 MTN S-[(1-oxyl-2,2,5,5-tetramethyl-2,5-dihydro-1H-pyrrol-3-yl)methyl] methanesulfonothioate × 1 MG MAGNESIUM ION × 4 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.6；290 K；2.5% PEG3350,20 mM Bis Tris, 150 mM Magnesium acetate, 10 mM C8E4, pH 6.6, VAPOR DIFFUSION, HANGING DROP, temperature 290K
Resolution 2.44 Å R-free 0.248
3M8D Crystal structure of spin-labeled BtuB V10R1 with bound calcium and cyanocobalamin Deposited 2010-03-17 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 21–614（594 aa）
Mutation：V10R1A CNC CYANOCOBALAMIN × 1 C8E (HYDROXYETHYLOXY)TRI(ETHYLOXY)OCTANE × 6 MTN S-[(1-oxyl-2,2,5,5-tetramethyl-2,5-dihydro-1H-pyrrol-3-yl)methyl] methanesulfonothioate × 1 CA CALCIUM ION × 3 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.6；290 K；2.5% PEG3350, 150 mM calcium chloride, 20 mM Bis tris, 10 mM C8E4, pH 6.6, VAPOR DIFFUSION, HANGING DROP, temperature 290K
Resolution 2.44 Å R-free 0.275
3RGM Crystal structure of spin-labeled BtuB T156R1 Deposited 2011-04-08 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 21–614（594 aa）
Mutation：T156R1 C8E (HYDROXYETHYLOXY)TRI(ETHYLOXY)OCTANE × 6 MG MAGNESIUM ION × 9 MTN S-[(1-oxyl-2,2,5,5-tetramethyl-2,5-dihydro-1H-pyrrol-3-yl)methyl] methanesulfonothioate × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.6；290 K；3.0% PEG3350, 200 mM magnesium acetate, 10mM C8E4, 20 mM Bis Tris pH 6.6, VAPOR DIFFUSION, HANGING DROP, temperature 290K
Resolution 2.60 Å R-free 0.254
3RGN Crystal structure of spin-labeled BtuB W371R1 Deposited 2011-04-08 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 21–614（594 aa）
Mutation：W371R1 C8E (HYDROXYETHYLOXY)TRI(ETHYLOXY)OCTANE × 7 MG MAGNESIUM ION × 3 MTN S-[(1-oxyl-2,2,5,5-tetramethyl-2,5-dihydro-1H-pyrrol-3-yl)methyl] methanesulfonothioate × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.6；290 K；3.0% PEG3350, 200 mM magnesium acetate, 10 mM C8E4, 20 mM Bis Tris pH 6.6, VAPOR DIFFUSION, HANGING DROP, temperature 290K
Resolution 2.30 Å R-free 0.250
7NSU ColicinE9 intact translocation complex Deposited 2021-03-08 Assembly 1 Protein heterocomplex Heteromer；Protein × 6 PDB declaration: hexameric（6） Consistent with protein count
Chain F 21–614（594 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 7.9
cryo-EM vitrification conditions Cryogen ETHANE；3 uL of diluted translocon preparation were applied on freshly glow discharged grids coated with graphene oxide (as described in https://doi.org/10.1038/s41594-019-0355-2); after 30sec waiting grids were blotted for 8-10 using -10 force and plunge frozen in liquid ethane
Resolution 4.70 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.