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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：Q9IFX1 New Search
6PDB entries
7Biological assembly
9chain/assembly records
Main Difference Dimensions in This Set
Different construct Different mutation/modification Different assembly state 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
3QSQ Crystal structure of the projection domain of the human astrovirus capsid protein Deposited 2011-02-21 Assembly 1 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain A 415–646（232 aa） Fragment：UNP residues 415-646
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 9.5；298 K；28% PEG 3000, 0.1 M CHES, 0.1 M glycine, pH 9.5, VAPOR DIFFUSION, HANGING DROP, temperature 298K
Resolution 1.80 Å R-free 0.215
5IBV Crystal Structure of Human Astrovirus capsid protein Deposited 2016-02-22 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 71–416（346 aa） Fragment：unp residues 71-416
Non-standard monomer：Yes (specific site not provided by mmCIF) No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；298 K；VAPOR DIFFUSION, HANGING DROP, 0.2 M ammoium phosphate, 22% PEG 4000
Resolution 2.15 Å R-free 0.246
7RK1 Crystal structure of the human astrovirus serotype 8 capsid spike in complex with scFv 3E8, an astrovirus-neutralizing antibody, at 2.05-A resolution Deposited 2021-07-21 Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain A 429–647（219 aa）
Chain B 429–647（219 aa）
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；295.15 K；0.2 M lithium citrate tribasic, 18 % PEG 3350
Resolution 2.05 Å R-free 0.238
7RK2 Crystal structure of the human astrovirus serotype 8 capsid spike in complex with scFv 2D9, an astrovirus-neutralizing antibody, at 2.65-A resolution Deposited 2021-07-21 Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain A 429–647（219 aa）
Chain B 429–647（219 aa）
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.5；295.15 K；0.1 M ammonium acetate, 0.1 M Bis-Tris pH 5.5, 16 % PEG 10,000
Resolution 2.65 Å R-free 0.247
9WYD Crystal structure of HAstV8 spike and FcRn Deposited 2025-09-26 Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric（3） Consistent with protein count
Chain C 415–646（232 aa）
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions LIQUID DIFFUSION；291.15 K；0.1 M BICINE pH 8.5, 8% w/v Polyethylene glycol monomethyl ether 5,000
Resolution 2.65 Å R-free 0.232
9WYG Crystal structure of HAstV8 spike Deposited 2025-09-26 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 415–646（232 aa）
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions LIQUID DIFFUSION；291.15 K；0.1 M HEPES pH 7.5, 30% w/v Polyethylene glycol 1,000
Resolution 1.44 Å R-free 0.203
9WYG Crystal structure of HAstV8 spike Deposited 2025-09-26 Assembly 2 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain A 415–646（232 aa）
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions LIQUID DIFFUSION；291.15 K；0.1 M HEPES pH 7.5, 30% w/v Polyethylene glycol 1,000
Resolution 1.44 Å R-free 0.203

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.