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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：P01591 New Search
24PDB entries
24Biological assembly
24chain/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
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 J 24–159（136 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
6LX3 Cryo-EM structure of human secretory immunoglobulin A Deposited 2020-02-10 Assembly 1 Insufficient information Heteromer；Protein × 6 PDB declaration: hexameric（6） Consistent with protein count
Chain J 1–159（159 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.15 Å
6LXW Cryo-EM structure of human secretory immunoglobulin A in complex with the N-terminal domain of SpsA Deposited 2020-02-12 Assembly 1 Insufficient information Heteromer；Protein × 7 PDB declaration: heptameric（7） Consistent with protein count
Chain J 1–159（159 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.27 Å
6UE7 Structure of dimeric sIgA complex Deposited 2019-09-20 Assembly 1 Other combination Heteromer；Protein × 6 PDB declaration: hexameric（6） Consistent with protein count
Chain D 23–159（137 aa） Fragment：UNP residues 23-159
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 7 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.2
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.90 Å
6UE8 Structure of tetrameric sIgA complex (Class 1) Deposited 2019-09-20 Assembly 1 Other combination Heteromer；Protein × 10 PDB declaration: decameric（10） Consistent with protein count
Chain D 23–159（137 aa） Fragment：UNP residues 23-159
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 5 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.2
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.00 Å
6UE9 Structure of tetrameric sIgA complex (Class 2) Deposited 2019-09-20 Assembly 1 Other combination Heteromer；Protein × 10 PDB declaration: decameric（10） Consistent with protein count
Chain D 23–159（137 aa） Fragment：UNP residues 23-159
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 7 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.2
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.90 Å
6UEA Structure of pentameric sIgA complex Deposited 2019-09-20 Assembly 1 Other combination Heteromer；Protein × 12 PDB declaration: dodecameric（12） Consistent with protein count
Chain D 23–159（137 aa） Fragment：UNP residues 23-159
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.2
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.00 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 D 23–159（137 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
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 J 24–159（136 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 J 24–159（136 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 J 24–159（136 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 J 24–159（136 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 J 24–159（136 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 J 24–159（136 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 J 24–159（136 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 J 24–159（136 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
8R83 pentameric IgMFc-AIM complex global refinement Deposited 2023-11-28 Assembly 1 Other combination Heteromer；Protein × 12 PDB declaration: 12-meric（12） Consistent with protein count
Chain J 1–159（159 aa）
Not recorded CA CALCIUM ION × 2 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 6 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.57 Å
8R84 pentameric IgMFc-AIM complex focused refinement Deposited 2023-11-28 Assembly 1 Other combination Heteromer；Protein × 6 PDB declaration: hexameric（6） Consistent with protein count
Chain J 1–159（159 aa）
Not recorded CA CALCIUM ION × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.60 Å
8SKU Structure of human SIgA1 in complex with human CD89 (FcaR1) Deposited 2023-04-20 Assembly 1 Other combination Heteromer；Protein × 8 PDB declaration: octameric（8） Consistent with protein count
Chain J 23–159（137 aa）
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 ELECTRON MICROSCOPY
cryo-EM buffer pH 7
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.20 Å
8SKV Structure of human SIgA1 in complex with Streptococcus pyogenes protein M4 (Arp4) Deposited 2023-04-20 Assembly 1 Other combination Heteromer；Protein × 8 PDB declaration: octameric（8） Consistent with protein count
Chain J 23–159（137 aa）
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 7 ELECTRON MICROSCOPY
cryo-EM buffer pH 7
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.10 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 J 1–159（159 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 J 1–159（159 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 J 1–159（159 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
9MBZ Cryo-EM structure of human FcRL4 bound to IgA-Fc/J Deposited 2025-03-17 Assembly 1 Insufficient information Heteromer；Protein × 6 PDB declaration: hexameric（6） Consistent with protein count
Chain J 1–159（159 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY mmCIF provides none of the parsed conditions Resolution 3.30 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.