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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：Q54450 New Search
14PDB entries
21Biological assembly
22chain/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
1B2V HEME-BINDING PROTEIN A Deposited 1998-12-01 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 1–188（188 aa）
Not recorded CA CALCIUM ION × 1 HEM PROTOPORPHYRIN IX CONTAINING FE × 1 X-RAY DIFFRACTION
X-ray crystallization conditions pH 4.6；0.2M CACL, 0.1M NA ACETATE PH 4.6, 20% ISOPRPANOL
Resolution 1.90 Å R-free 0.218
1DK0 CRYSTAL STRUCTURE OF THE HEMOPHORE HASA FROM SERRATIA MARCESCENS CRYSTAL FORM P2(1), PH8 Deposited 1999-12-06 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 1–188（188 aa）
Not recorded HEM PROTOPORPHYRIN IX CONTAINING FE × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8；293 K；0.1M NaHepes, pH8.0, 1.4M NaKTartrate, VAPOR DIFFUSION, HANGING DROP, temperature 293K
Resolution 1.77 Å R-free 0.213
1DK0 CRYSTAL STRUCTURE OF THE HEMOPHORE HASA FROM SERRATIA MARCESCENS CRYSTAL FORM P2(1), PH8 Deposited 1999-12-06 Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain B 1–188（188 aa）
Not recorded HEM PROTOPORPHYRIN IX CONTAINING FE × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8；293 K；0.1M NaHepes, pH8.0, 1.4M NaKTartrate, VAPOR DIFFUSION, HANGING DROP, temperature 293K
Resolution 1.77 Å R-free 0.213
1DKH CRYSTAL STRUCTURE OF THE HEMOPHORE HASA, PH 6.5 Deposited 1999-12-07 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 1–188（188 aa）
Not recorded ZN ZINC ION × 3 SM SAMARIUM (III) ION × 1 HEM PROTOPORPHYRIN IX CONTAINING FE × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.5；293 K；Cacodylate buffer pH6.5, Zinc Acetate 140mM, Glycerol 2%, PEG8000 10%, Samarium Chloride 10mM., VAPOR DIFFUSION, HANGING DROP, temperature 293K
Resolution 3.20 Å R-free 0.288
1YBJ Structural and Dynamics studies of both apo and holo forms of the hemophore HasA Deposited 2004-12-21 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 2–179（178 aa）
Not recorded No recorded non-water small molecule SOLUTION NMR
NMR measurement conditions pH 5.6；303 K；Ionic strength (raw mmCIF value) 20mM sodium phosphate buffer；Pressure ambient
NMR sample composition 1.8mM HasA 15N | 20mM sodium phosphate buffer, pH5.6; 90% H2O/10% D20
NMR sample composition 1.9mM HasA 15N,13C | 20mM sodium phosphate buffer, pH5.6; 90% H2O/10% D20
Resolution not provided
2CN4 The crystal structure of the secreted dimeric form of the hemophore HasA reveals a domain swapping with an exchanged heme ligand Deposited 2006-05-18 Assembly 1 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain A 2–174（173 aa）
Chain B 2–174（173 aa）
Not recorded HEM PROTOPORPHYRIN IX CONTAINING FE × 2 PO4 PHOSPHATE ION × 2 X-RAY DIFFRACTION
X-ray crystallization conditions pH 8.5；2 MICROLITERS PROTEIN (AT A CONCENTRATION OF ABOUT 4 MG/ML) WERE MIXED WITH 1 MICROLITER RESERVOIR CONSISTING OF 100 MM TRIS BUFFER AT PH 8.5, 2 M K2HPO4 AND 2 M NAH2PO4.
Resolution 2.30 Å R-free 0.224
2UYD Crystal structure of the SmHasA mutant H83A Deposited 2007-04-04 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain X 1–188（188 aa）
Mutation：YES HEM PROTOPORPHYRIN IX CONTAINING FE × 1 ZN ZINC ION × 8 ACT ACETATE ION × 2 X-RAY DIFFRACTION
X-ray crystallization conditions pH 6.5；293 K；DROPS WERE PREPARED BY MIXING 2MICROL OF THE PROTEIN SOLUTION WITH 1 MICROL OF THE RESERVOIR SOLUTION THAT CONTAINED 100 MM SODIUM CACODYLATE AT PH 6.5, 200 MM ZN(OAC)2 AND 10 % (V/V) 2-PROPANOL. THE BROWNISH CRYSTALS GREW OVER A PERIOD OF 2 MONTHS AT 20 DEGREES C.
Resolution 2.70 Å R-free 0.274
3CSL Structure of the Serratia marcescens hemophore receptor HasR in complex with its hemophore HasA and heme Deposited 2008-04-10 Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain C 2–188（187 aa）
Not recorded HEM PROTOPORPHYRIN IX CONTAINING FE × 1 GOL GLYCEROL × 5 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8；291 K；2 M NaCl, 100 mM Tris, pH 8.0, VAPOR DIFFUSION, HANGING DROP, temperature 291K
Resolution 2.70 Å R-free 0.274
3CSL Structure of the Serratia marcescens hemophore receptor HasR in complex with its hemophore HasA and heme Deposited 2008-04-10 Assembly 2 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain D 2–188（187 aa）
Not recorded HEM PROTOPORPHYRIN IX CONTAINING FE × 1 GOL GLYCEROL × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8；291 K；2 M NaCl, 100 mM Tris, pH 8.0, VAPOR DIFFUSION, HANGING DROP, temperature 291K
Resolution 2.70 Å R-free 0.274
3CSN Structure of the Serratia marcescens hemophore receptor HasR in complex with its hemophore HasA Deposited 2008-04-10 Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain C 2–188（187 aa）
Not recorded GOL GLYCEROL × 1 X-RAY DIFFRACTION
X-ray crystallization conditions pH 8；291 K；2 M NaCl, 100 mM Tris, pH 8.0, VAPOR DIFFUSION, HANGING DROP, temperature 291K
Resolution 3.00 Å R-free 0.244
3CSN Structure of the Serratia marcescens hemophore receptor HasR in complex with its hemophore HasA Deposited 2008-04-10 Assembly 2 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain D 2–188（187 aa）
Not recorded GOL GLYCEROL × 4 X-RAY DIFFRACTION
X-ray crystallization conditions pH 8；291 K；2 M NaCl, 100 mM Tris, pH 8.0, VAPOR DIFFUSION, HANGING DROP, temperature 291K
Resolution 3.00 Å R-free 0.244
3DDR Structure of the Serratia marcescens hemophore receptor HasR-Ile671Gly mutant in complex with its hemophore HasA and heme Deposited 2008-06-06 Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain C 2–188（187 aa）
Not recorded NA SODIUM ION × 1 GOL GLYCEROL × 1 HEM PROTOPORPHYRIN IX CONTAINING FE × 1 X-RAY DIFFRACTION
X-ray crystallization conditions pH 8；291 K；2 M NaCl, 100 mM Tris, pH 8.0, VAPOR DIFFUSION, HANGING DROP, temperature 291K
Resolution 2.80 Å R-free 0.262
3DDR Structure of the Serratia marcescens hemophore receptor HasR-Ile671Gly mutant in complex with its hemophore HasA and heme Deposited 2008-06-06 Assembly 2 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain D 2–188（187 aa）
Not recorded NA SODIUM ION × 1 GOL GLYCEROL × 5 HEM PROTOPORPHYRIN IX CONTAINING FE × 1 X-RAY DIFFRACTION
X-ray crystallization conditions pH 8；291 K；2 M NaCl, 100 mM Tris, pH 8.0, VAPOR DIFFUSION, HANGING DROP, temperature 291K
Resolution 2.80 Å R-free 0.262
5C58 A double mutant of serratia marcescens hemophore receptor HasR in complex with its hemophore HasA and heme Deposited 2015-06-19 Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain B 2–188（187 aa） Fragment：UNP residues 2-188
Not recorded HEM PROTOPORPHYRIN IX CONTAINING FE × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；291 K；100mM Tris pH 7 to 8, 1.8 to 2.2mM NaCl, 100mM K2HPO4
Resolution 2.79 Å R-free 0.296
9XOH Crystal Structure of Redesigned HasAsm Variant (14-mutation) with Iron Tetraphenylporphyrin Deposited 2025-11-13 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 1–176（176 aa）
Mutation：A2S, G13A, H17A, G21T, S42T, Q63N, N79S, D102T, V110N, D112E, A125S, V131E, G145S, D156K MQP [5,10,15,20-tetraphenylporphyrinato(2-)-kappa~4~N~21~,N~22~,N~23~,N~24~]iron × 1 GOL GLYCEROL × 3 NA SODIUM ION × 4 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 6.5；293 K；0.1M sodium cacodylate-HCl, 1M sodium citrate tribasic
Resolution 1.51 Å R-free 0.234
9XOH Crystal Structure of Redesigned HasAsm Variant (14-mutation) with Iron Tetraphenylporphyrin Deposited 2025-11-13 Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain B 1–176（176 aa）
Mutation：A2S, G13A, H17A, G21T, S42T, Q63N, N79S, D102T, V110N, D112E, A125S, V131E, G145S, D156K MQP [5,10,15,20-tetraphenylporphyrinato(2-)-kappa~4~N~21~,N~22~,N~23~,N~24~]iron × 1 GOL GLYCEROL × 2 NA SODIUM ION × 4 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 6.5；293 K；0.1M sodium cacodylate-HCl, 1M sodium citrate tribasic
Resolution 1.51 Å R-free 0.234
9XOH Crystal Structure of Redesigned HasAsm Variant (14-mutation) with Iron Tetraphenylporphyrin Deposited 2025-11-13 Assembly 3 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain C 1–176（176 aa）
Mutation：A2S, G13A, H17A, G21T, S42T, Q63N, N79S, D102T, V110N, D112E, A125S, V131E, G145S, D156K MQP [5,10,15,20-tetraphenylporphyrinato(2-)-kappa~4~N~21~,N~22~,N~23~,N~24~]iron × 1 NA SODIUM ION × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 6.5；293 K；0.1M sodium cacodylate-HCl, 1M sodium citrate tribasic
Resolution 1.51 Å R-free 0.234
9XOH Crystal Structure of Redesigned HasAsm Variant (14-mutation) with Iron Tetraphenylporphyrin Deposited 2025-11-13 Assembly 4 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain D 1–176（176 aa）
Mutation：A2S, G13A, H17A, G21T, S42T, Q63N, N79S, D102T, V110N, D112E, A125S, V131E, G145S, D156K MQP [5,10,15,20-tetraphenylporphyrinato(2-)-kappa~4~N~21~,N~22~,N~23~,N~24~]iron × 1 GOL GLYCEROL × 2 NA SODIUM ION × 3 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 6.5；293 K；0.1M sodium cacodylate-HCl, 1M sodium citrate tribasic
Resolution 1.51 Å R-free 0.234
9XOK Crystal Structure of Redesigned HasAsm Variant (51-mutation) with Iron Tetraphenylporphyrin Deposited 2025-11-13 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 3–173（171 aa）
Mutation：;F11L, G12D, G13N, Y14L, S15T, I16L, H17Q, D18E, Y19F, L20F, G21N, Q22E, S25A, T26S, S58T, A61K, N62D, Q63G, Q88T, S93A, D96N, D102S, T103S, S104T, Q109T, V110E, D112Q, V113F, S114R, F115L, N119G, L120W, S121T, L123E, Q124I, A125S, Q126E, T144S, G145T, A146P, E148L, T149Q, G153N, I154Q, D156Q, D157Q, V162T, D167M, Q168E, V169I, A170R ; MQP [5,10,15,20-tetraphenylporphyrinato(2-)-kappa~4~N~21~,N~22~,N~23~,N~24~]iron × 1 SO4 SULFATE ION × 1 GOL GLYCEROL × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 6.5；293 K；0.1M sodium cacodylate-HCl, 2M ammonium sulfate, 0.2M NaCl
Resolution 1.80 Å R-free 0.330
9XPD Crystal Structure of Redesigned HasAsm Variant (51-mutation) with Heme Deposited 2025-11-16 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 1–176（176 aa）
Mutation：;F11L, G12D, G13N, Y14L, S15T, I16L, H17Q, D18E, Y19F, L20F, G21N, Q22E, S25A, T26S, S58T, A61K, N62D, Q63G, Q88T, S93A, D96N, D102S, T103S, S104T, Q109T, V110E, D112Q, V113F, S114R, F115L, N119G, L120W, S121T, L123E, Q124I, A125S, Q126E, T144S, G145T, A146P, E148L, T149Q, G153N, I154Q, D156Q, D157Q, V162T, D167M, Q168E, V169I, A170R ; IMD IMIDAZOLE × 1 CIT CITRIC ACID × 1 GOL GLYCEROL × 1 HEM PROTOPORPHYRIN IX CONTAINING FE × 1 NA SODIUM ION × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 8；293 K；0.1M imidazole-HCl, 1M sodium citrate tribasic
Resolution 1.22 Å R-free 0.177
9XPI Crystal Structure of Redesigned HasAsm Variant (48-mutation) with Heme Deposited 2025-11-16 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 1–176（176 aa）
Mutation：;F11L, G12A, G13N, Y14L, S15T, I16L, H17A, D18E, Y19F, L20F, G21N, Q22E, T26Y, N41S, S58T, A61K, N62D, Q63G, N79S, E80P, Q88T, S91A, S93T, D96N, T103S, S104T, Q109V, V110N, D112E, S114T, G116S, L120W, S121T, L123E, A125E, Q126E, Q134K, V136I, G145T, E148L, T149Q, G153S, I154L, D156K, D157Q, V162I, Q168E, V169I ; HEM PROTOPORPHYRIN IX CONTAINING FE × 1 ACT ACETATE ION × 3 ZN ZINC ION × 6 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 8；293 K；0.1M imidazole-HCl, 2.5M NaCl, 0.2M Zinc acetate
Resolution 2.16 Å R-free 0.255

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.