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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：P56181 New Search
9PDB entries
9Biological assembly
10chain/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
5XTB Cryo-EM structure of human respiratory complex I matrix arm Deposited 2017-06-18 Assembly 1 Protein heterocomplex Heteromer；Protein × 18 PDB declaration: octadecameric（18） Consistent with protein count
Chain K 74–106（33 aa） Fragment：UNP RESIDUES 74-106
Not recorded SF4 IRON/SULFUR CLUSTER × 6 FMN FLAVIN MONONUCLEOTIDE × 1 8Q1 S-[2-({N-[(2R)-2-hydroxy-3,3-dimethyl-4-(phosphonooxy)butanoyl]-beta-alanyl}amino)ethyl] dodecanethioate × 1 NDP NADPH DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE × 1 FES FE2/S2 (INORGANIC) CLUSTER × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.40 Å
5XTD Cryo-EM structure of human respiratory complex I Deposited 2017-06-19 Assembly 1 Protein heterocomplex Heteromer；Protein × 45 PDB declaration: 45-meric（45） Consistent with protein count
Chain K 74–106（33 aa）
Not recorded SF4 IRON/SULFUR CLUSTER × 6 FMN FLAVIN MONONUCLEOTIDE × 1 PLX (9R,11S)-9-({[(1S)-1-HYDROXYHEXADECYL]OXY}METHYL)-2,2-DIMETHYL-5,7,10-TRIOXA-2LAMBDA~5~-AZA-6LAMBDA~5~-PHOSPHAOCTACOSANE-6,6,11-TRIOL × 9 8Q1 S-[2-({N-[(2R)-2-hydroxy-3,3-dimethyl-4-(phosphonooxy)butanoyl]-beta-alanyl}amino)ethyl] dodecanethioate × 2 NDP NADPH DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE × 1 FES FE2/S2 (INORGANIC) CLUSTER × 2 CDL CARDIOLIPIN × 5 PEE 1,2-dioleoyl-sn-glycero-3-phosphoethanolamine × 4 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.70 Å
5XTH Cryo-EM structure of human respiratory supercomplex I1III2IV1 Deposited 2017-06-19 Assembly 1 Protein heterocomplex Heteromer；Protein × 80 PDB declaration: 80-meric（80） Consistent with protein count
Chain K 74–106（33 aa） Fragment：UNP RESIDUES 74-106
Not recorded SF4 IRON/SULFUR CLUSTER × 6 FMN FLAVIN MONONUCLEOTIDE × 1 PLX (9R,11S)-9-({[(1S)-1-HYDROXYHEXADECYL]OXY}METHYL)-2,2-DIMETHYL-5,7,10-TRIOXA-2LAMBDA~5~-AZA-6LAMBDA~5~-PHOSPHAOCTACOSANE-6,6,11-TRIOL × 12 8Q1 S-[2-({N-[(2R)-2-hydroxy-3,3-dimethyl-4-(phosphonooxy)butanoyl]-beta-alanyl}amino)ethyl] dodecanethioate × 2 NDP NADPH DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE × 1 FES FE2/S2 (INORGANIC) CLUSTER × 4 CDL CARDIOLIPIN × 14 PEE 1,2-dioleoyl-sn-glycero-3-phosphoethanolamine × 10 CU COPPER (II) ION × 3 MG MAGNESIUM ION × 1 HEA HEME-A × 2 ZN ZINC ION × 1 HEC HEME C × 2 HEM PROTOPORPHYRIN IX CONTAINING FE × 4 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.90 Å
5XTI Cryo-EM architecture of human respiratory chain megacomplex-I2III2IV2 Deposited 2017-06-19 Assembly 1 Protein heterocomplex Heteromer；Protein × 138 PDB declaration: 138-meric（138） Consistent with protein count
Chain BK 74–106（33 aa） Fragment：UNP RESIDUES 74-106
Chain K 74–106（33 aa） Fragment：UNP RESIDUES 74-106
Not recorded SF4 IRON/SULFUR CLUSTER × 12 FMN FLAVIN MONONUCLEOTIDE × 2 PLX (9R,11S)-9-({[(1S)-1-HYDROXYHEXADECYL]OXY}METHYL)-2,2-DIMETHYL-5,7,10-TRIOXA-2LAMBDA~5~-AZA-6LAMBDA~5~-PHOSPHAOCTACOSANE-6,6,11-TRIOL × 21 8Q1 S-[2-({N-[(2R)-2-hydroxy-3,3-dimethyl-4-(phosphonooxy)butanoyl]-beta-alanyl}amino)ethyl] dodecanethioate × 4 NDP NADPH DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE × 2 FES FE2/S2 (INORGANIC) CLUSTER × 6 CDL CARDIOLIPIN × 19 PEE 1,2-dioleoyl-sn-glycero-3-phosphoethanolamine × 14 CU COPPER (II) ION × 6 MG MAGNESIUM ION × 2 HEA HEME-A × 4 ZN ZINC ION × 2 HEC HEME C × 2 HEM PROTOPORPHYRIN IX CONTAINING FE × 4 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 17.40 Å
9CWT Human kidney respiratory complex I Deposited 2024-07-30 Assembly 1 Protein heterocomplex Heteromer；Protein × 45 PDB declaration: 45-meric（45） Consistent with protein count
Chain K 1–108（108 aa）
Not recorded SF4 IRON/SULFUR CLUSTER × 6 FMN FLAVIN MONONUCLEOTIDE × 1 ZMP S-[2-({N-[(2S)-2-hydroxy-3,3-dimethyl-4-(phosphonooxy)butanoyl]-beta-alanyl}amino)ethyl] tetradecanethioate × 1 NDP NADPH DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE × 1 FES FE2/S2 (INORGANIC) CLUSTER × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.44 Å
9I4I High resolution Cryo-EM structure of human complex I in mitochondria Deposited 2025-01-24 Assembly 1 Protein heterocomplex Heteromer；Protein × 45 PDB declaration: 45-meric（45） Consistent with protein count
Chain K 1–108（108 aa）
Not recorded PEE 1,2-dioleoyl-sn-glycero-3-phosphoethanolamine × 7 CDL CARDIOLIPIN × 6 8Q1 S-[2-({N-[(2R)-2-hydroxy-3,3-dimethyl-4-(phosphonooxy)butanoyl]-beta-alanyl}amino)ethyl] dodecanethioate × 2 PLX (9R,11S)-9-({[(1S)-1-HYDROXYHEXADECYL]OXY}METHYL)-2,2-DIMETHYL-5,7,10-TRIOXA-2LAMBDA~5~-AZA-6LAMBDA~5~-PHOSPHAOCTACOSANE-6,6,11-TRIOL × 7 DGT 2'-DEOXYGUANOSINE-5'-TRIPHOSPHATE × 1 MG MAGNESIUM ION × 1 SF4 IRON/SULFUR CLUSTER × 6 FMN FLAVIN MONONUCLEOTIDE × 1 NDP NADPH DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE × 1 FES FE2/S2 (INORGANIC) CLUSTER × 2 ZN ZINC ION × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.63 Å
9TI4 High resolution Cryo-EM structure of human complex I in mitochondria Deposited 2025-12-04 Assembly 1 Protein heterocomplex Heteromer；Protein × 45 PDB declaration: 45-meric（45） Consistent with protein count
Chain K 68–106（39 aa）
Not recorded SF4 IRON/SULFUR CLUSTER × 6 FMN FLAVIN MONONUCLEOTIDE × 1 PEE 1,2-dioleoyl-sn-glycero-3-phosphoethanolamine × 7 8Q1 S-[2-({N-[(2R)-2-hydroxy-3,3-dimethyl-4-(phosphonooxy)butanoyl]-beta-alanyl}amino)ethyl] dodecanethioate × 2 NDP NADPH DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE × 1 FES FE2/S2 (INORGANIC) CLUSTER × 2 PLX (9R,11S)-9-({[(1S)-1-HYDROXYHEXADECYL]OXY}METHYL)-2,2-DIMETHYL-5,7,10-TRIOXA-2LAMBDA~5~-AZA-6LAMBDA~5~-PHOSPHAOCTACOSANE-6,6,11-TRIOL × 7 ZN ZINC ION × 1 CDL CARDIOLIPIN × 6 DGT 2'-DEOXYGUANOSINE-5'-TRIPHOSPHATE × 1 MG MAGNESIUM ION × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4；25 mM HEPES-KOH pH=7.5, 50 mM KCl, 20 mM Mg(OAc)2, 0.01% (v/v) Lauryl Maltose Neopentyl Glycol (LMNG), 0.001 % cardiolipin, 0.001 % glycol-diosgenin (GDN, Sigma-Aldrich), 0.1mM DTT
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.66 Å
9W2U Cryo-EM structure of complex I on the bovine heart submitochondrial particles, open Deposited 2025-07-28 Assembly 1 Protein heterocomplex Heteromer；Protein × 45 PDB declaration: 45-meric（45） Consistent with protein count
Chain s 64–108（45 aa）
Not recorded FME N-FORMYLMETHIONINE × 6 PC1 1,2-DIACYL-SN-GLYCERO-3-PHOSPHOCHOLINE × 11 SF4 IRON/SULFUR CLUSTER × 6 FES FE2/S2 (INORGANIC) CLUSTER × 2 FMN FLAVIN MONONUCLEOTIDE × 1 K POTASSIUM ION × 1 3PE 1,2-Distearoyl-sn-glycerophosphoethanolamine × 18 CDL CARDIOLIPIN × 6 CHD CHOLIC ACID × 1 GTP GUANOSINE-5'-TRIPHOSPHATE × 1 MG MAGNESIUM ION × 1 NDP NADPH DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE × 1 ZN ZINC ION × 1 MYR MYRISTIC ACID × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.60 Å
9W2V Cryo-EM structure of complex I on the bovine heart submitochondrial particles, closed Deposited 2025-07-28 Assembly 1 Protein heterocomplex Heteromer；Protein × 45 PDB declaration: 45-meric（45） Consistent with protein count
Chain s 64–108（45 aa）
Not recorded FME N-FORMYLMETHIONINE × 4 3PE 1,2-Distearoyl-sn-glycerophosphoethanolamine × 19 PC1 1,2-DIACYL-SN-GLYCERO-3-PHOSPHOCHOLINE × 12 SF4 IRON/SULFUR CLUSTER × 6 FES FE2/S2 (INORGANIC) CLUSTER × 2 FMN FLAVIN MONONUCLEOTIDE × 1 K POTASSIUM ION × 1 CDL CARDIOLIPIN × 6 MG MAGNESIUM ION × 1 GTP GUANOSINE-5'-TRIPHOSPHATE × 1 NDP NADPH DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE × 1 ZN ZINC ION × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.80 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.