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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：P01871 New Search
17PDB entries
17Biological assembly
149chain/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
2AGJ Crystal Structure of a glycosylated Fab from an IgM cryoglobulin with properties of a natural proteolytic antibody Deposited 2005-07-27 Assembly 1 Other combination Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain H 1–183（183 aa）
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；pH 6.5；293 K；PEG 15000-20000, sodium chloride, MES, pH 6.5, VAPOR DIFFUSION, HANGING DROP, temperature 293.0K
Resolution 2.60 Å R-free 0.279
6KXS Cryo-EM structure of human IgM-Fc in complex with the J chain and the ectodomain of pIgR Deposited 2019-09-12 Assembly 1 Other combination Heteromer；Protein × 12 PDB declaration: dodecameric（12） Consistent with protein count
Chain A 106–453（348 aa）
Chain B 106–453（348 aa）
Chain C 106–453（348 aa）
Chain D 106–453（348 aa）
Chain E 106–453（348 aa）
Chain F 106–453（348 aa）
Chain G 106–453（348 aa）
Chain H 106–453（348 aa）
Chain K 106–453（348 aa）
Chain L 106–453（348 aa）
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 10 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.40 Å
7K0C Structure of Secretory IgM Core Deposited 2020-09-04 Assembly 1 Other combination Heteromer；Protein × 12 PDB declaration: dodecameric（12） Consistent with protein count
Chain A 103–453（351 aa）
Chain B 103–453（351 aa）
Chain E 103–453（351 aa）
Chain F 103–453（351 aa）
Chain G 103–453（351 aa）
Chain H 103–453（351 aa）
Chain I 103–453（351 aa）
Chain J 103–453（351 aa）
Chain K 103–453（351 aa）
Chain L 103–453（351 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 7.2
cryo-EM vitrification conditions Cryogen ETHANE；Blot for 3.5 seconds before plunging with blot force 7.
Resolution 3.30 Å
7WSP Structure of a membrane protein M Deposited 2022-01-30 Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain B 106–471（366 aa）
Chain D 106–472（367 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 7
cryo-EM vitrification conditions Cryogen NITROGEN
Resolution 4.09 Å
7Y09 Cryo-EM structure of human IgM-Fc in complex with the J chain and the DBL domain of DBLMSP Deposited 2022-06-03 Assembly 1 Other combination Heteromer；Protein × 12 PDB declaration: dodecameric（12） Consistent with protein count
Chain A 106–453（348 aa）
Chain B 106–453（348 aa）
Chain C 106–453（348 aa）
Chain D 106–453（348 aa）
Chain E 106–453（348 aa）
Chain F 106–453（348 aa）
Chain G 106–453（348 aa）
Chain H 106–453（348 aa）
Chain K 106–453（348 aa）
Chain L 106–453（348 aa）
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 10 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.71 Å
7Y0H Cryo-EM structure of human IgM-Fc in complex with the J chain and the P. falciparum VAR2CSA FCR3 Deposited 2022-06-05 Assembly 1 Other combination Heteromer；Protein × 12 PDB declaration: dodecameric（12） Consistent with protein count
Chain A 106–453（348 aa）
Chain B 106–453（348 aa）
Chain C 106–453（348 aa）
Chain D 106–453（348 aa）
Chain E 106–453（348 aa）
Chain F 106–453（348 aa）
Chain G 106–453（348 aa）
Chain H 106–453（348 aa）
Chain K 106–453（348 aa）
Chain L 106–453（348 aa）
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 10 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.56 Å
7Y0J Cryo-EM structure of human IgM-Fc in complex with the J chain and the P. falciparum TM284VAR1 Deposited 2022-06-05 Assembly 1 Other combination Heteromer；Protein × 12 PDB declaration: dodecameric（12） Consistent with protein count
Chain A 106–453（348 aa）
Chain B 106–453（348 aa）
Chain C 106–453（348 aa）
Chain D 106–453（348 aa）
Chain E 106–453（348 aa）
Chain F 106–453（348 aa）
Chain G 106–453（348 aa）
Chain H 106–453（348 aa）
Chain K 106–453（348 aa）
Chain L 106–453（348 aa）
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 10 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.62 Å
7YG2 Cryo-EM structure of human IgM-Fc in complex with the J chain and the DBL domain of DBLMSP2 Deposited 2022-07-09 Assembly 1 Other combination Heteromer；Protein × 12 PDB declaration: dodecameric（12） Consistent with protein count
Chain A 106–453（348 aa）
Chain B 106–453（348 aa）
Chain C 106–453（348 aa）
Chain D 106–453（348 aa）
Chain E 106–453（348 aa）
Chain F 106–453（348 aa）
Chain G 106–453（348 aa）
Chain H 106–453（348 aa）
Chain K 106–453（348 aa）
Chain L 106–453（348 aa）
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 10 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.32 Å
7YSG Cryo-EM structure of human FcmR bound to sIgM Deposited 2022-08-12 Assembly 1 Other combination Heteromer；Protein × 16 PDB declaration: hexadecameric（16） Consistent with protein count
Chain A 222–453（232 aa）
Chain B 222–453（232 aa）
Chain C 222–453（232 aa）
Chain D 222–453（232 aa）
Chain E 222–453（232 aa）
Chain F 222–453（232 aa）
Chain G 222–453（232 aa）
Chain H 222–453（232 aa）
Chain K 222–453（232 aa）
Chain L 222–453（232 aa）
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 10 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.18 Å
7YTC Cryo-EM structure of human FcmR bound to IgM-Fc/J Deposited 2022-08-14 Assembly 1 Protein heterocomplex Heteromer；Protein × 12 PDB declaration: dodecameric（12） Consistent with protein count
Chain A 222–453（232 aa）
Chain B 222–453（232 aa）
Chain C 222–453（232 aa）
Chain D 222–453（232 aa）
Chain E 222–453（232 aa）
Chain F 222–453（232 aa）
Chain G 222–453（232 aa）
Chain H 222–453（232 aa）
Chain K 222–453（232 aa）
Chain L 222–453（232 aa）
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 11 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.39 Å
7YTD Cryo-EM structure of four human FcmR bound to IgM-Fc/J Deposited 2022-08-14 Assembly 1 Protein heterocomplex Heteromer；Protein × 15 PDB declaration: pentadecameric（15） Consistent with protein count
Chain A 222–452（231 aa）
Chain B 222–452（231 aa）
Chain C 222–452（231 aa）
Chain D 222–452（231 aa）
Chain E 222–452（231 aa）
Chain F 222–452（231 aa）
Chain G 222–452（231 aa）
Chain H 222–452（231 aa）
Chain K 222–452（231 aa）
Chain L 222–452（231 aa）
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 10 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.71 Å
8GZN IgM-var2CSA complex Deposited 2022-09-27 Assembly 1 Protein heterocomplex Heteromer；Protein × 13 PDB declaration: tridecameric（13） Consistent with protein count
Chain A 1–453（453 aa）
Chain B 1–453（453 aa）
Chain C 1–453（453 aa）
Chain D 1–453（453 aa）
Chain E 1–453（453 aa）
Chain F 1–453（453 aa）
Chain G 1–453（453 aa）
Chain H 1–453（453 aa）
Chain K 1–453（453 aa）
Chain L 1–453（453 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.60 Å
8WYR Cryo-EM structure of human CD5L bound to IgM-Fc/J Deposited 2023-10-31 Assembly 1 Insufficient information Heteromer；Protein × 12 PDB declaration: dodecameric（12） Consistent with protein count
Chain A 106–453（348 aa）
Chain B 106–453（348 aa）
Chain C 106–453（348 aa）
Chain D 106–453（348 aa）
Chain E 106–453（348 aa）
Chain F 106–453（348 aa）
Chain G 106–453（348 aa）
Chain H 106–453（348 aa）
Chain K 106–453（348 aa）
Chain L 106–453（348 aa）
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 10 CA CALCIUM ION × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.39 Å
8WYS Local map of human CD5L bound to IgM-Fc/J Deposited 2023-10-31 Assembly 1 Insufficient information Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain A 106–453（348 aa）
Chain L 106–453（348 aa）
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 CA CALCIUM ION × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.41 Å
9ARV CryoEM structure of AMETA-A3 Deposited 2024-02-23 Assembly 1 Protein heterocomplex Heteromer；Protein × 11 PDB declaration: undecameric（11） Consistent with protein count
Chain A 106–453（348 aa）
Chain B 106–453（348 aa）
Chain C 106–453（348 aa）
Chain D 106–453（348 aa）
Chain E 106–453（348 aa）
Chain L 106–453（348 aa）
Chain M 106–453（348 aa）
Chain N 106–453（348 aa）
Chain O 106–453（348 aa）
Chain P 106–453（348 aa）
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 5 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.60 Å
9UO3 Cryo-EM structure of the human IgM-Fc hexamer Deposited 2025-04-25 Assembly 1 Protein homooligomer Homooligomer；Protein × 12 PDB declaration: dodecameric（12） Consistent with protein count
Chain A 106–446（341 aa）
Chain B 106–446（341 aa）
Chain C 106–446（341 aa）
Chain D 106–446（341 aa）
Chain E 106–446（341 aa）
Chain F 106–446（341 aa）
Chain G 106–446（341 aa）
Chain H 106–446（341 aa）
Chain I 106–446（341 aa）
Chain J 106–446（341 aa）
Chain K 106–446（341 aa）
Chain L 106–446（341 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.17 Å
9UO4 Cryo-EM structure of the chimeric human IgM-Fc hexamer Deposited 2025-04-25 Assembly 1 Protein homooligomer Homooligomer；Protein × 12 PDB declaration: dodecameric（12） Consistent with protein count
Chain A 106–433（328 aa）
Chain B 106–433（328 aa）
Chain C 106–433（328 aa）
Chain D 106–433（328 aa）
Chain E 106–433（328 aa）
Chain F 106–433（328 aa）
Chain G 106–433（328 aa）
Chain H 106–433（328 aa）
Chain I 106–433（328 aa）
Chain J 106–433（328 aa）
Chain K 106–433（328 aa）
Chain L 106–433（328 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
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.