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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：P03961 New Search
22PDB entries
22Biological assembly
22chain/assembly records
Main Difference Dimensions in This Set
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
6HRA Cryo-EM structure of the KdpFABC complex in an E1 outward-facing state (state 1) Deposited 2018-09-26 Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain C 1–190（190 aa）
Not recorded K POTASSIUM ION × 3 ELECTRON MICROSCOPY
cryo-EM buffer pH 8；10 mM Tris-HCl pH 8, 10 mM MgCl2, 10 mM NaCl and 0.012% DDM
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.70 Å
6HRB Cryo-EM structure of the KdpFABC complex in an E2 inward-facing state (state 2) Deposited 2018-09-26 Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain C 1–190（190 aa）
Not recorded K POTASSIUM ION × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8；10 mM Tris-HCl pH 8, 10 mM MgCl2, 10 mM NaCl and 0.012% DDM
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 4.00 Å
7BGY Cryo-EM Structure of KdpFABC in E2Pi state with MgF4 Deposited 2021-01-09 Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain C 1–190（190 aa）
Not recorded PEV (1S)-2-{[(2-AMINOETHOXY)(HYDROXY)PHOSPHORYL]OXY}-1-[(PALMITOYLOXY)METHYL]ETHYL STEARATE × 1 9Y0 (2R)-3-(((2-aminoethoxy)(hydroxy)phosphoryl)oxy)-2-(palmitoyloxy)propyl (E)-octadec-9-enoate × 1 MG MAGNESIUM ION × 1 MF4 TETRAFLUOROMAGNESATE(2-) × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5；A 10x stock solution of MgF4 was added to the protein mixture containing all other buffer components to produce final concentrations 1 mM MgCl2 and 10 mM NaF.
cryo-EM vitrification conditions Cryogen ETHANE；3 uL of protein mixture applied to grid. Blot time 4 seconds, blot force 0, no wait before plunging.
Resolution 2.90 Å
7BH1 Cryo-EM Structure of KdpFABC in E1 state with K Deposited 2021-01-09 Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain C 1–190（190 aa）
Not recorded K POTASSIUM ION × 1 9Y0 (2R)-3-(((2-aminoethoxy)(hydroxy)phosphoryl)oxy)-2-(palmitoyloxy)propyl (E)-octadec-9-enoate × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE；3 uL of protein mixture applied to grid. Blot time 4 seconds, blot force 0, no wait before plunging.
Resolution 3.38 Å
7BH2 Cryo-EM Structure of KdpFABC in E2Pi state with BeF3 and K+ Deposited 2021-01-09 Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain C 1–190（190 aa）
Not recorded K POTASSIUM ION × 2 9Y0 (2R)-3-(((2-aminoethoxy)(hydroxy)phosphoryl)oxy)-2-(palmitoyloxy)propyl (E)-octadec-9-enoate × 1 MG MAGNESIUM ION × 1 BEF BERYLLIUM TRIFLUORIDE ION × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5；The beryllium fluoride in the buffer was added to the protein mixture containing all other buffer components in the form of a pre-incubated mixture, at a 1:10 volume, to produce the final concentrations 2.5 mM BeSO4 and 10 mM NaF.
cryo-EM vitrification conditions Cryogen ETHANE；3 uL of protein mixture applied to grid. Blot time 4 seconds, blot force 0, no wait before plunging.
Resolution 3.00 Å
7LC3 CryoEM Structure of KdpFABC in E1-ATP state Deposited 2021-01-09 Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain C 1–190（190 aa）
Not recorded K POTASSIUM ION × 2 9Y0 (2R)-3-(((2-aminoethoxy)(hydroxy)phosphoryl)oxy)-2-(palmitoyloxy)propyl (E)-octadec-9-enoate × 1 MG MAGNESIUM ION × 1 ACP PHOSPHOMETHYLPHOSPHONIC ACID ADENYLATE ESTER × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5；AMPPCP was added to the protein after size-exclusion chromatography and incubated 1 hr prior to freezing
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.23 Å
7LC6 Cryo-EM Structure of KdpFABC in E2-P state with BeF3 Deposited 2021-01-09 Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain C 1–190（190 aa）
Not recorded K POTASSIUM ION × 1 9Y0 (2R)-3-(((2-aminoethoxy)(hydroxy)phosphoryl)oxy)-2-(palmitoyloxy)propyl (E)-octadec-9-enoate × 1 MG MAGNESIUM ION × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5；The beryllium fluoride in the buffer was added to the protein mixture containing all other buffer components in the form of a pre-incubated mixture with the final concentrations 2.5 mM BeSO4 and 10 mM NaF.
cryo-EM vitrification conditions Cryogen ETHANE；3 uL of protein mixture applied to grid. Blot time 4 seconds, blot force 0, no wait before plunging.
Resolution 3.70 Å
7ZRD Cryo-EM map of the WT KdpFABC complex in the E1-P tight conformation, stabilised with the inhibitor orthovanadate Deposited 2022-05-04 Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain C 1–190（190 aa）
Not recorded K POTASSIUM ION × 9 CDL CARDIOLIPIN × 2 VO4 VANADATE ION × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8；10 mM Tris-HCl pH 8, 10 mM MgCl2, 10 mM NaCl and 0.0125% DDM
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 3.30 Å
7ZRE Cryo-EM map of the WT KdpFABC complex in the E1-P tight conformation, under turnover conditions Deposited 2022-05-04 Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain C 1–190（190 aa）
Not recorded K POTASSIUM ION × 9 CDL CARDIOLIPIN × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 8；10 mM Tris-HCl pH 8, 10 mM MgCl2, 10 mM NaCl and 0.0125% DDM
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 3.40 Å
7ZRG Cryo-EM map of the WT KdpFABC complex in the E1_ATPearly conformation, under turnover conditions Deposited 2022-05-04 Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain C 1–190（190 aa）
Not recorded K POTASSIUM ION × 7 CDL CARDIOLIPIN × 2 ATP ADENOSINE-5'-TRIPHOSPHATE × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8；10 mM Tris-HCl pH 8, 10 mM MgCl2, 10 mM NaCl and 0.0125% DDM
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 3.50 Å
7ZRH Cryo-EM structure of the KdpFABC complex in a nucleotide-free E1 conformation loaded with K+ Deposited 2022-05-04 Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain C 1–190（190 aa）
Not recorded K POTASSIUM ION × 7 CDL CARDIOLIPIN × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 8；10 mM Tris-HCl pH 8, 10 mM MgCl2, 10 mM NaCl and 0.0125% DDM
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 3.40 Å
7ZRI Cryo-EM structure of the KdpFABC complex in a nucleotide-free E1 conformation loaded with K+ Deposited 2022-05-04 Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain C 1–190（190 aa）
Not recorded K POTASSIUM ION × 7 CDL CARDIOLIPIN × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 8；10 mM Tris-HCl pH 8, 10 mM MgCl2, 10 mM NaCl and 0.0125% DDM
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 3.50 Å
7ZRJ Cryo-EM structure of the KdpFABC complex in a nucleotide-free E1 conformation loaded with K+ Deposited 2022-05-04 Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain C 1–190（190 aa）
Not recorded K POTASSIUM ION × 7 CDL CARDIOLIPIN × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 8；10 mM Tris-HCl pH 8, 10 mM MgCl2, 10 mM NaCl and 0.0125% DDM
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 3.70 Å
7ZRK Cryo-EM map of the WT KdpFABC complex in the E1-P_ADP conformation, under turnover conditions Deposited 2022-05-04 Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain C 1–190（190 aa）
Not recorded K POTASSIUM ION × 12 CDL CARDIOLIPIN × 2 ADP ADENOSINE-5'-DIPHOSPHATE × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8；10 mM Tris-HCl pH 8, 10 mM MgCl2, 10 mM NaCl and 0.0125% DDM
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 3.10 Å
7ZRL Cryo-EM map of the unphosphorylated KdpFABC complex in the E2-P conformation, under turnover conditions Deposited 2022-05-04 Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain C 1–190（190 aa）
Not recorded K POTASSIUM ION × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8；10 mM Tris-HCl pH 8, 10 mM MgCl2, 10 mM NaCl and 0.0125% DDM
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 4.00 Å
7ZRM Cryo-EM map of the unphosphorylated KdpFABC complex in the E1-P_ADP conformation, under turnover conditions Deposited 2022-05-04 Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain C 1–190（190 aa）
Not recorded K POTASSIUM ION × 5 ADP ADENOSINE-5'-DIPHOSPHATE × 1 MG MAGNESIUM ION × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8；10 mM Tris-HCl pH 8, 10 mM MgCl2, 10 mM NaCl and 0.0125% DDM
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 3.70 Å
9OC4 High-resolution cryo-EM structure of KdpFABC in the E1P-ADP state in lipid nanodisc Deposited 2025-04-23 Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain C 1–190（190 aa）
Not recorded K POTASSIUM ION × 2 9Y0 (2R)-3-(((2-aminoethoxy)(hydroxy)phosphoryl)oxy)-2-(palmitoyloxy)propyl (E)-octadec-9-enoate × 2 ADP ADENOSINE-5'-DIPHOSPHATE × 1 MG MAGNESIUM ION × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4；20 mM Tris pH 7.4, 100 mM KCl, and 0.5 mM TCEP
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.10 Å
9ZWK High-resolution cryo-EM structure of KdpFABC in the E1 state in lipid nanodisc Deposited 2026-01-03 Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain C 1–190（190 aa）
Not recorded K POTASSIUM ION × 3 9Y0 (2R)-3-(((2-aminoethoxy)(hydroxy)phosphoryl)oxy)-2-(palmitoyloxy)propyl (E)-octadec-9-enoate × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4；20 mM Tris pH 7.4, 100 mM KCl, and 0.5 mM TCEP, 2 mM MgCl2, 1 mM ATP
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.34 Å
9ZWL High-resolution cryo-EM structure of KdpFABC in the E1-ATP state in lipid nanodisc Deposited 2026-01-03 Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain C 1–190（190 aa）
Not recorded K POTASSIUM ION × 3 9Y0 (2R)-3-(((2-aminoethoxy)(hydroxy)phosphoryl)oxy)-2-(palmitoyloxy)propyl (E)-octadec-9-enoate × 2 ATP ADENOSINE-5'-TRIPHOSPHATE × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4；20 mM Tris pH 7.4, 100 mM KCl, and 0.5 mM TCEP, 2mM MgCl2, 1mM ATP
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.28 Å
9ZWM High-resolution cryo-EM structure of KdpFABC in the E1P state in lipid nanodisc Deposited 2026-01-03 Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain C 1–190（190 aa）
Not recorded K POTASSIUM ION × 3 9Y0 (2R)-3-(((2-aminoethoxy)(hydroxy)phosphoryl)oxy)-2-(palmitoyloxy)propyl (E)-octadec-9-enoate × 2 MG MAGNESIUM ION × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4；20 mM Tris pH 7.4, 100 mM KCl, and 0.5 mM TCEP, 2 mM MgCl2, 1 mM ATP
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.25 Å
9ZWN High-resolution cryo-EM structure of KdpFABC in the E2P state in lipid nanodisc Deposited 2026-01-03 Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain C 1–190（190 aa）
Not recorded K POTASSIUM ION × 3 9Y0 (2R)-3-(((2-aminoethoxy)(hydroxy)phosphoryl)oxy)-2-(palmitoyloxy)propyl (E)-octadec-9-enoate × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4；20 mM Tris pH 7.4, 100 mM KCl, and 0.5 mM TCEP, 2 mM MgCl2, 1 mM ATP
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.58 Å
9ZWO High-resolution cryo-EM structure of KdpFABC in the E2 state in lipid nanodisc Deposited 2026-01-03 Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain C 1–190（190 aa）
Not recorded K POTASSIUM ION × 2 9Y0 (2R)-3-(((2-aminoethoxy)(hydroxy)phosphoryl)oxy)-2-(palmitoyloxy)propyl (E)-octadec-9-enoate × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4；20 mM Tris pH 7.4, 100 mM KCl, and 0.5 mM TCEP, 2 mM MgCl2, 1 mM ATP
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.72 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.