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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：P20023 New Search
9PDB entries
10Biological assembly
12chain/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
1GHQ CR2-C3D COMPLEX STRUCTURE Deposited 2001-01-11 Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric（3） Consistent with protein count
Chain B 21–153（133 aa） Fragment：SEQUENCE DATABASE RESIDUES 21-153
Chain C 21–153（133 aa） Fragment：SEQUENCE DATABASE RESIDUES 21-153
Not recorded ZN ZINC ION × 2 NDG 2-acetamido-2-deoxy-alpha-D-glucopyranose × 2 X-RAY DIFFRACTION
X-ray crystallization conditions pH 6；pH 6.0
Resolution 2.04 Å R-free 0.239
1LY2 Crystal structure of unliganded human CD21 SCR1-SCR2 (Complement receptor type 2) Deposited 2002-06-06 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 20–149（130 aa）
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；298 K；PEG 4000, pH 7.5, VAPOR DIFFUSION, HANGING DROP at 298K, temperature 298.0K
Resolution 1.80 Å R-free 0.234
1W2R Solution structure of CR2 SCR 1-2 by X-ray scattering Deposited 2004-07-08 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 21–153（133 aa）
Not recorded No recorded non-water small molecule SOLUTION SCATTERING mmCIF provides none of the parsed conditions Resolution not provided
1W2S Solution structure of CR2 SCR 1-2 in its complex with C3d by X-ray scattering Deposited 2004-07-08 Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain B 21–153（133 aa）
Not recorded No recorded non-water small molecule SOLUTION SCATTERING mmCIF provides none of the parsed conditions Resolution not provided
2ATY Complement receptor chimaeric conjugate CR2-Ig Deposited 2005-08-26 Assembly 1 Insufficient information Homooligomer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain A 21–153（133 aa）
Chain B 21–153（133 aa）
Not recorded No recorded non-water small molecule SOLUTION SCATTERING mmCIF provides none of the parsed conditions Resolution not provided
2GSX Complement Receptor Type 2 Deposited 2006-04-27 Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 21–971（951 aa）
Not recorded No recorded non-water small molecule SOLUTION SCATTERING mmCIF provides none of the parsed conditions Resolution not provided
3OED The structure of the complex between complement receptor CR2 and its ligand complement fragment C3d Deposited 2010-08-12 Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain C 20–153（134 aa） Fragment：CR2 (unp residues 20-153)
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7；100 mM HEPES, 20% Poly Ethylene Glycol 6000, 200 mM CaCl2, pH 7.0, VAPOR DIFFUSION, HANGING DROP
Resolution 3.16 Å R-free 0.259
3OED The structure of the complex between complement receptor CR2 and its ligand complement fragment C3d Deposited 2010-08-12 Assembly 2 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain D 20–153（134 aa） Fragment：CR2 (unp residues 20-153)
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7；100 mM HEPES, 20% Poly Ethylene Glycol 6000, 200 mM CaCl2, pH 7.0, VAPOR DIFFUSION, HANGING DROP
Resolution 3.16 Å R-free 0.259
8SM0 Crystal structure of human complement receptor 2 (CD21) in complex with Epstein-Barr virus major glycoprotein gp350 Deposited 2023-04-25 Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain C 21–149（129 aa） Fragment：first two amino-terminal domains
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 12 SO4 SULFATE ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；291 K；1.60M AMMONIUM SULFATE, 2% PEG 400, 0.5% GLYCEROL, 0.1M SODIUM ACETATE PH5.5
Resolution 1.68 Å R-free 0.241
8ZNI Structure of Epstein-Barr virus major glycoprotein gp350 in complex with the receptor CR2 Deposited 2024-05-27 Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain A 1–971（971 aa）
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 6 ELECTRON MICROSCOPY
cryo-EM buffer pH 8.3
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.29 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.