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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：P01921 New Search
2PDB entries
3Biological assembly
3chain/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
2IAD CLASS II MHC I-AD IN COMPLEX WITH AN INFLUENZA HEMAGGLUTININ PEPTIDE 126-138 Deposited 1998-03-13 Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain B 28–216（189 aa） Fragment：RESIDUES 126P - 138P OF CHAIN B ARE COVALENTLY LINKED INFLUENZA HEMAGGLUTININ PEPTIDE
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions pH 7.4；19% PEG 8000 0.2 M TRIS, PH 7.4
Resolution 2.40 Å R-free 0.308
2IAD CLASS II MHC I-AD IN COMPLEX WITH AN INFLUENZA HEMAGGLUTININ PEPTIDE 126-138 Deposited 1998-03-13 Assembly 2 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain B 28–216（189 aa） Fragment：RESIDUES 126P - 138P OF CHAIN B ARE COVALENTLY LINKED INFLUENZA HEMAGGLUTININ PEPTIDE
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions pH 7.4；19% PEG 8000 0.2 M TRIS, PH 7.4
Resolution 2.40 Å R-free 0.308
7RDV TFH TCR bound to MHC Class II IAd presenting aggrecan epitope Deposited 2021-07-11 Assembly 1 Protein heterocomplex Heteromer；Protein × 5 PDB declaration: pentameric（5） Consistent with protein count
Chain B 31–216（186 aa）
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6；293.15 K；0.1M Sodium Cacodylate pH6.0 15% w/v PEG4000
Resolution 2.90 Å R-free 0.265

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.