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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：Q9UL51 New Search
3PDB entries
3Biological assembly
6chain/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
2MPF Solution structure human HCN2 CNBD in the cAMP-unbound state Deposited 2014-05-16 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 521–672（152 aa） Fragment：cyclic nucleotide binding domain (UNP residues 521-672)
Not recorded No recorded non-water small molecule SOLUTION NMR
NMR measurement conditions pH 7；298 K；Pressure ambient
NMR sample composition 1 mM [U-15N] HCN2 CNBD, 20 mM potassium phosphate, 150 mM potassium chloride, 90% H2O/10% D2O | 90% H2O/10% D2O
NMR sample composition 1 mM [U-13C; U-15N] HCN2 CNBD, 20 mM potassium phosphate, 150 mM potassium chloride, 90% H2O/10% D2O | 90% H2O/10% D2O
NMR sample composition 1 mM HCN2 CNBD, 20 mM potassium phosphate, 150 mM potassium chloride, 90% H2O/10% D2O | 90% H2O/10% D2O
Resolution not provided
3U10 Tetramerization dynamics of the C-terminus underlies isoform-specific cAMP-gating in HCN channels Deposited 2011-09-29 Assembly 1 Protein homooligomer Homooligomer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain A 470–672（203 aa） Fragment：C-TERMINAL DOMAIN (UNP RESIDUES 470-672)
Not recorded CMP ADENOSINE-3',5'-CYCLIC-MONOPHOSPHATE × 4 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION；pH 4.6；278 K；20% PEG 8000, 0.5M NaCl, 0.1M Citrate buffer (pH 4.6), 10% glycerol, VAPOR DIFFUSION, temperature 278K
Resolution 2.30 Å R-free 0.272
9R1V Structure of the human chimera HCN112 hyperpolarization-activated cyclic nucleotide-gated ion channel. Deposited 2025-04-28 Assembly 1 Insufficient information Homooligomer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain A 471–705（235 aa）
Chain B 471–705（235 aa）
Chain C 471–705（235 aa）
Chain D 471–705（235 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.53 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.