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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：Q9H1K1 New Search
18PDB entries
18Biological assembly
37chain/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
5KZ5 Architecture of the Human Mitochondrial Iron-Sulfur Cluster Assembly Machinery: the Complex Formed by the Iron Donor, the Sulfur Donor, and the Scaffold Deposited 2016-07-22 Assembly 1 Protein heterocomplex Heteromer；Protein × 36 PDB declaration: 36-meric（36） Consistent with protein count
Chain a 25–142（118 aa）
Chain b 25–142（118 aa）
Chain c 25–142（118 aa）
Chain d 25–142（118 aa）
Chain e 25–142（118 aa）
Chain f 25–142（118 aa）
Chain g 25–142（118 aa）
Chain h 25–142（118 aa）
Chain i 25–142（118 aa）
Chain j 25–142（118 aa）
Chain k 25–142（118 aa）
Chain l 25–142（118 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 8
Resolution 14.30 Å
5WKP Crystal Structure of the Human mitochondrial Cysteine Desulfurase in complex with ISD11 and Iron-Sulfur Cluster Scaffold Protein ISCU1, and E. coli ACP1 protein at 3.15A Deposited 2017-07-25 Assembly 1 Protein heterocomplex Heteromer；Protein × 8 PDB declaration: octameric（8） Consistent with protein count
Chain D 1–142（142 aa）
Chain H 1–142（142 aa）
Not recorded PLP PYRIDOXAL-5'-PHOSPHATE × 2 8Q1 S-[2-({N-[(2R)-2-hydroxy-3,3-dimethyl-4-(phosphonooxy)butanoyl]-beta-alanyl}amino)ethyl] dodecanethioate × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7；285 K；0.1 M MES pH 7 15 % PEG 3350
Resolution 3.15 Å R-free 0.242
5WLW Crystal Structure of the Human Mitochondrial Cysteine Desulfurase with active Cysteine Loop within ISCU1 active site, coordinating Zn ion. Complexed with human ISD11 and E. coli ACP1 at 3.3A. Deposited 2017-07-27 Assembly 1 Protein heterocomplex Heteromer；Protein × 8 PDB declaration: octameric（8） Consistent with protein count
Chain D 1–142（142 aa）
Chain H 1–142（142 aa）
Not recorded PLP PYRIDOXAL-5'-PHOSPHATE × 2 8Q1 S-[2-({N-[(2R)-2-hydroxy-3,3-dimethyl-4-(phosphonooxy)butanoyl]-beta-alanyl}amino)ethyl] dodecanethioate × 2 ZN ZINC ION × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；285 K；0.1 M MES pH 7.0 15 % PEG 3350
Resolution 3.32 Å R-free 0.255
6NZU Structure of the human frataxin-bound iron-sulfur cluster assembly complex Deposited 2019-02-14 Assembly 1 Protein heterocomplex Heteromer；Protein × 10 PDB declaration: decameric（10） Consistent with protein count
Chain D 35–157（123 aa） Fragment：UNP residues 35-157
Chain H 35–157（123 aa） Fragment：UNP residues 35-157
Not recorded PLP PYRIDOXAL-5'-PHOSPHATE × 2 8Q1 S-[2-({N-[(2R)-2-hydroxy-3,3-dimethyl-4-(phosphonooxy)butanoyl]-beta-alanyl}amino)ethyl] dodecanethioate × 2 ZN ZINC ION × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.20 Å
6UXE Structure of the human mitochondrial desulfurase complex Nfs1-ISCU2(M140I)-ISD11 with E.coli ACP1 at 1.57 A resolution showing flexibility of N terminal end of ISCU2 Deposited 2019-11-07 Assembly 1 Protein heterocomplex Heteromer；Protein × 8 PDB declaration: octameric（8） Consistent with protein count
Chain D 35–167（133 aa）
Mutation：M140I PLP PYRIDOXAL-5'-PHOSPHATE × 2 GOL GLYCEROL × 12 EDO 1,2-ETHANEDIOL × 100 PEG DI(HYDROXYETHYL)ETHER × 22 PG4 TETRAETHYLENE GLYCOL × 4 P15 2,5,8,11,14,17-HEXAOXANONADECAN-19-OL × 2 DTT 2,3-DIHYDROXY-1,4-DITHIOBUTANE × 2 PGE TRIETHYLENE GLYCOL × 6 EDT {[-(BIS-CARBOXYMETHYL-AMINO)-ETHYL]-CARBOXYMETHYL-AMINO}-ACETIC ACID × 2 8Q1 S-[2-({N-[(2R)-2-hydroxy-3,3-dimethyl-4-(phosphonooxy)butanoyl]-beta-alanyl}amino)ethyl] dodecanethioate × 2 MES 2-(N-MORPHOLINO)-ETHANESULFONIC ACID × 2 1PE PENTAETHYLENE GLYCOL × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION；288 K；0.1 M MES pH 6.0-6.5, 22% PEG400
Resolution 1.57 Å R-free 0.180
6W1D Structure of human mitochondrial complex Nfs1-ISCU2 (WT)-ISD11 with E.coli ACP1 at 1.8 A resolution (NIAU)2 Deposited 2020-03-04 Assembly 1 Protein heterocomplex Heteromer；Protein × 8 PDB declaration: octameric（8） Consistent with protein count
Chain D 35–167（133 aa）
Not recorded PLP PYRIDOXAL-5'-PHOSPHATE × 2 GOL GLYCEROL × 12 EDO 1,2-ETHANEDIOL × 96 PEG DI(HYDROXYETHYL)ETHER × 22 PG4 TETRAETHYLENE GLYCOL × 4 P15 2,5,8,11,14,17-HEXAOXANONADECAN-19-OL × 2 DTT 2,3-DIHYDROXY-1,4-DITHIOBUTANE × 2 PGE TRIETHYLENE GLYCOL × 6 EDT {[-(BIS-CARBOXYMETHYL-AMINO)-ETHYL]-CARBOXYMETHYL-AMINO}-ACETIC ACID × 2 8Q1 S-[2-({N-[(2R)-2-hydroxy-3,3-dimethyl-4-(phosphonooxy)butanoyl]-beta-alanyl}amino)ethyl] dodecanethioate × 2 MES 2-(N-MORPHOLINO)-ETHANESULFONIC ACID × 2 1PE PENTAETHYLENE GLYCOL × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION；pH 6；288 K；0.1 M MES pH 6.0-6.5 22 % PEG 400
Resolution 1.79 Å R-free 0.189
6WI2 Structure of human mitochondrial complex Nfs1-ISCU2-ISD11 with E.coli ACP1 at 1.95 A resolution (NIAU)2. N-terminal mutation of ISCU2 (L35) traps Nfs1 Cys loop in the active site of ISCU2 without metal present. Deposited 2020-04-08 Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain D 10–142（133 aa）
Not recorded PLP PYRIDOXAL-5'-PHOSPHATE × 1 EDO 1,2-ETHANEDIOL × 36 GOL GLYCEROL × 3 PEG DI(HYDROXYETHYL)ETHER × 10 PG4 TETRAETHYLENE GLYCOL × 2 ETE 2-{2-[2-2-(METHOXY-ETHOXY)-ETHOXY]-ETHOXY}-ETHANOL × 1 PGE TRIETHYLENE GLYCOL × 1 MES 2-(N-MORPHOLINO)-ETHANESULFONIC ACID × 1 EDT {[-(BIS-CARBOXYMETHYL-AMINO)-ETHYL]-CARBOXYMETHYL-AMINO}-ACETIC ACID × 1 8Q1 S-[2-({N-[(2R)-2-hydroxy-3,3-dimethyl-4-(phosphonooxy)butanoyl]-beta-alanyl}amino)ethyl] dodecanethioate × 1 1PE PENTAETHYLENE GLYCOL × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION；pH 5.5；288 K；0.1 M MES pH 5.5 22.5 % PEG 400
Resolution 1.95 Å R-free 0.185
6WIH N-terminal mutation of ISCU2 (L35H36) traps Nfs1 Cys loop in the active site of ISCU2 without metal present. Structure of human mitochondrial complex Nfs1-ISCU2(L35H36)-ISD11 with E.coli ACP1 at 1.9 A resolution (NIAU)2. Deposited 2020-04-09 Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain D 10–142（133 aa）
Mutation：S11H PLP PYRIDOXAL-5'-PHOSPHATE × 1 PEG DI(HYDROXYETHYL)ETHER × 9 GOL GLYCEROL × 5 EDO 1,2-ETHANEDIOL × 38 PG4 TETRAETHYLENE GLYCOL × 2 P15 2,5,8,11,14,17-HEXAOXANONADECAN-19-OL × 1 PGE TRIETHYLENE GLYCOL × 3 EDT {[-(BIS-CARBOXYMETHYL-AMINO)-ETHYL]-CARBOXYMETHYL-AMINO}-ACETIC ACID × 1 8Q1 S-[2-({N-[(2R)-2-hydroxy-3,3-dimethyl-4-(phosphonooxy)butanoyl]-beta-alanyl}amino)ethyl] dodecanethioate × 1 1PE PENTAETHYLENE GLYCOL × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION；pH 5.5；288 K；0.1 M MES pH 5.5 22.5 % PEG 400
Resolution 1.90 Å R-free 0.186
7RTK Structure of the (NIAU)2 complex with N-terminal mutation of ISCU2 Y35D at 2.5 A resolution Deposited 2021-08-13 Assembly 1 Protein heterocomplex Heteromer；Protein × 8 PDB declaration: octameric（8） Consistent with protein count
Chain D 35–167（133 aa）
Mutation：Y35D PLP PYRIDOXAL-5'-PHOSPHATE × 2 EDO 1,2-ETHANEDIOL × 58 GOL GLYCEROL × 6 PG4 TETRAETHYLENE GLYCOL × 2 PEG DI(HYDROXYETHYL)ETHER × 16 P15 2,5,8,11,14,17-HEXAOXANONADECAN-19-OL × 2 DTT 2,3-DIHYDROXY-1,4-DITHIOBUTANE × 2 PGE TRIETHYLENE GLYCOL × 6 EDT {[-(BIS-CARBOXYMETHYL-AMINO)-ETHYL]-CARBOXYMETHYL-AMINO}-ACETIC ACID × 2 8Q1 S-[2-({N-[(2R)-2-hydroxy-3,3-dimethyl-4-(phosphonooxy)butanoyl]-beta-alanyl}amino)ethyl] dodecanethioate × 2 MES 2-(N-MORPHOLINO)-ETHANESULFONIC ACID × 2 1PE PENTAETHYLENE GLYCOL × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.5；288 K；0.1 M MES pH 5.5 22.5 % PEG 400
Resolution 2.50 Å R-free 0.214
8PK8 Structure of the human mitochondrial iron-sulfur cluster biosynthesis complex during persulfide transfer (persulfide on ISCU2) Deposited 2023-06-26 Assembly 1 Protein heterocomplex Heteromer；Protein × 5 PDB declaration: pentameric（5） Consistent with protein count
Chain D 35–167（133 aa）
Non-standard monomer：Yes (specific site not provided by mmCIF) PLP PYRIDOXAL-5'-PHOSPHATE × 1 8Q1 S-[2-({N-[(2R)-2-hydroxy-3,3-dimethyl-4-(phosphonooxy)butanoyl]-beta-alanyl}amino)ethyl] dodecanethioate × 1 FE2 FE (II) ION × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.49 Å
8PK9 Structure of the human mitochondrial iron-sulfur cluster biosynthesis complex during persulfide transfer (persulfide on NFS1 and ISCU2) Deposited 2023-06-26 Assembly 1 Protein heterocomplex Heteromer；Protein × 5 PDB declaration: pentameric（5） Consistent with protein count
Chain D 35–167（133 aa）
Non-standard monomer：Yes (specific site not provided by mmCIF) PLP PYRIDOXAL-5'-PHOSPHATE × 1 8Q1 S-[2-({N-[(2R)-2-hydroxy-3,3-dimethyl-4-(phosphonooxy)butanoyl]-beta-alanyl}amino)ethyl] dodecanethioate × 1 FE2 FE (II) ION × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.58 Å
8PKA Structure of the human mitochondrial iron-sulfur cluster biosynthesis complex during persulfide transfer (without frataxin) Deposited 2023-06-26 Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain D 35–167（133 aa）
Not recorded PLP PYRIDOXAL-5'-PHOSPHATE × 1 8Q1 S-[2-({N-[(2R)-2-hydroxy-3,3-dimethyl-4-(phosphonooxy)butanoyl]-beta-alanyl}amino)ethyl] dodecanethioate × 1 FE2 FE (II) ION × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.75 Å
8RMC Structure of the FDX2-bound core ISC complex (proximal conformation) Deposited 2024-01-05 Assembly 1 Protein heterocomplex Heteromer；Protein × 9 PDB declaration: nonameric（9） Consistent with protein count
Chain D 35–167（133 aa）
Chain H 35–167（133 aa）
Not recorded FE2 FE (II) ION × 2 FES FE2/S2 (INORGANIC) CLUSTER × 1 8Q1 S-[2-({N-[(2R)-2-hydroxy-3,3-dimethyl-4-(phosphonooxy)butanoyl]-beta-alanyl}amino)ethyl] dodecanethioate × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.26 Å
8RMD Structure of the FDX2-bound core ISC complex (distal conformation) Deposited 2024-01-05 Assembly 1 Protein heterocomplex Heteromer；Protein × 9 PDB declaration: nonameric（9） Consistent with protein count
Chain D 35–167（133 aa）
Chain H 35–167（133 aa）
Not recorded 8Q1 S-[2-({N-[(2R)-2-hydroxy-3,3-dimethyl-4-(phosphonooxy)butanoyl]-beta-alanyl}amino)ethyl] dodecanethioate × 2 FE2 FE (II) ION × 2 FES FE2/S2 (INORGANIC) CLUSTER × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.52 Å
8RME Structure of the core ISC complex under turnover conditions (frataxin-bound) Deposited 2024-01-05 Assembly 1 Protein heterocomplex Heteromer；Protein × 9 PDB declaration: nonameric（9） Consistent with protein count
Chain D 35–167（133 aa）
Chain H 35–167（133 aa）
Not recorded FE2 FE (II) ION × 2 8Q1 S-[2-({N-[(2R)-2-hydroxy-3,3-dimethyl-4-(phosphonooxy)butanoyl]-beta-alanyl}amino)ethyl] dodecanethioate × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.49 Å
8RMF Structure of the core ISC complex under turnover conditions (FDX2-bound in proximal conformation) Deposited 2024-01-05 Assembly 1 Protein heterocomplex Heteromer；Protein × 9 PDB declaration: nonameric（9） Consistent with protein count
Chain D 35–167（133 aa）
Chain H 35–167（133 aa）
Not recorded 8Q1 S-[2-({N-[(2R)-2-hydroxy-3,3-dimethyl-4-(phosphonooxy)butanoyl]-beta-alanyl}amino)ethyl] dodecanethioate × 2 FE2 FE (II) ION × 2 FES FE2/S2 (INORGANIC) CLUSTER × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.33 Å
8RMG Structure of the core ISC complex under turnover conditions (FDX2-bound in distal conformation) Deposited 2024-01-05 Assembly 1 Protein heterocomplex Heteromer；Protein × 9 PDB declaration: nonameric（9） Consistent with protein count
Chain D 35–167（133 aa）
Chain H 35–167（133 aa）
Not recorded 8Q1 S-[2-({N-[(2R)-2-hydroxy-3,3-dimethyl-4-(phosphonooxy)butanoyl]-beta-alanyl}amino)ethyl] dodecanethioate × 2 FE2 FE (II) ION × 2 FES FE2/S2 (INORGANIC) CLUSTER × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.46 Å
8TVT Structure of human Cysteine desulfurase Nfs1 with L-propargylglycine bound to active site PLP in complex with ISD11, Acp1 and ISCU2 Deposited 2023-08-18 Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain D 35–167（133 aa）
Not recorded EDO 1,2-ETHANEDIOL × 30 PLP PYRIDOXAL-5'-PHOSPHATE × 1 LPH L-Propargylglycine × 1 GOL GLYCEROL × 3 PEG DI(HYDROXYETHYL)ETHER × 8 PG4 TETRAETHYLENE GLYCOL × 2 P15 2,5,8,11,14,17-HEXAOXANONADECAN-19-OL × 1 DTT 2,3-DIHYDROXY-1,4-DITHIOBUTANE × 1 PGE TRIETHYLENE GLYCOL × 1 EDT {[-(BIS-CARBOXYMETHYL-AMINO)-ETHYL]-CARBOXYMETHYL-AMINO}-ACETIC ACID × 1 8Q1 S-[2-({N-[(2R)-2-hydroxy-3,3-dimethyl-4-(phosphonooxy)butanoyl]-beta-alanyl}amino)ethyl] dodecanethioate × 1 MES 2-(N-MORPHOLINO)-ETHANESULFONIC ACID × 1 1PE PENTAETHYLENE GLYCOL × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 6.5；288 K；0.1 M MES pH 6.5 22.5 % PEG 400
Resolution 2.00 Å R-free 0.186

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.