6uea

Structure of pentameric sIgA complex

Method: ELECTRON MICROSCOPY D_max: 196.3 Å Quality: GOOD

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1. Protein Identity and Related Structures Protein Identity & Related Structures

Immunoglobulin heavy constant alpha 2

Homo sapiens

State in the Current Structure

Assembly	Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Associated Components	Method and Experimental Conditions	Structure Quality
1	Other combination Heteromer Protein × 12 其他Polymer 7 PDB declaration: dodecameric（12） Consistent with protein copy count	Chain A； UniProt 110–340 Chain B； UniProt 110–340 Chain E； UniProt 110–340 Chain F； UniProt 110–340 Chain G； UniProt 110–340 Chain H； UniProt 110–340 Chain I； UniProt 110–340 Chain J； UniProt 110–340 Chain K； UniProt 110–340 Chain L； UniProt 110–340	Fragment：UNP residues 110-340	Polymeric immunoglobulin receptor × 1 （P01833） Immunoglobulin J chain × 1 （P01591） 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose × 4 beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose × 3 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

Other States of the Same Protein in the Database

Each row is a biological assembly of the same UniProt protein in another PDB entry. The “Difference from current entry” column identifies evidence-level differences; no tag means the currently parsed fields agree.

Other PDB	Difference from Current Entry 6UEA	Assembly / Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Non-polymers	Method and Experimental Conditions	Structure Quality
6UE8 Structure of tetrameric sIgA complex (Class 1) Deposited 2019-09-20	Different construct Different mutation/modification Different oligomeric state Different ligand/ion	Assembly 1 Other combination Heteromer；Protein × 10 PDB declaration: decameric	Chain A 110–340（231 aa） Fragment：UNP residues 110-340 Chain B 110–340（231 aa） Fragment：UNP residues 110-340 Chain E 110–340（231 aa） Fragment：UNP residues 110-340 Chain F 110–340（231 aa） Fragment：UNP residues 110-340 Chain G 110–340（231 aa） Fragment：UNP residues 110-340 Chain H 110–340（231 aa） Fragment：UNP residues 110-340 Chain K 110–340（231 aa） Fragment：UNP residues 110-340 Chain L 110–340（231 aa） Fragment：UNP residues 110-340	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	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 10 PDB declaration: decameric	Chain A 110–340（231 aa） Fragment：UNP residues 110-340 Chain B 110–340（231 aa） Fragment：UNP residues 110-340 Chain E 110–340（231 aa） Fragment：UNP residues 110-340 Chain F 110–340（231 aa） Fragment：UNP residues 110-340 Chain G 110–340（231 aa） Fragment：UNP residues 110-340 Chain H 110–340（231 aa） Fragment：UNP residues 110-340 Chain K 110–340（231 aa） Fragment：UNP residues 110-340 Chain L 110–340（231 aa） Fragment：UNP residues 110-340	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
9OFS Crystal structure of the human IGA2m2 FC fragment-FC-alpha receptor (CD89) complex Deposited 2025-04-30	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 4 PDB declaration: tetrameric	Chain A 109–322（214 aa）	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 8 CL CHLORIDE ION × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8；294 K；0.15M sodium chloride 0.1M Tris-HCl pH 8.0 20% PEG 1000	Resolution 1.95 Å R-free 0.253

3 other PDB entries and 3 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence

UniProt name	IGHA2_HUMAN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 15–245； UniProt 110–340 Author chain B； PDBConstruct 15–245； UniProt 110–340 Author chain E； PDBConstruct 15–245； UniProt 110–340 Author chain F； PDBConstruct 15–245； UniProt 110–340 Author chain G； PDBConstruct 15–245； UniProt 110–340 Author chain H； PDBConstruct 15–245； UniProt 110–340 Author chain I； PDBConstruct 15–245； UniProt 110–340 Author chain J； PDBConstruct 15–245； UniProt 110–340 Author chain K； PDBConstruct 15–245； UniProt 110–340 Author chain L； PDBConstruct 15–245； UniProt 110–340

Polymeric immunoglobulin receptor

Homo sapiens

UniProt P01833

State in the Current Structure

Assembly	Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Associated Components	Method and Experimental Conditions	Structure Quality
1	Other combination Heteromer Protein × 12 其他Polymer 7 PDB declaration: dodecameric（12） Consistent with protein copy count	Chain C； UniProt 19–603	Fragment：UNP residues 19-603	Immunoglobulin heavy constant alpha 2 × 10 （P01877） Immunoglobulin J chain × 1 （P01591） 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose × 4 beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose × 3 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

Other States of the Same Protein in the Database

Other PDB	Difference from Current Entry 6UEA	Assembly / Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Non-polymers	Method and Experimental Conditions	Structure Quality
1XED Crystal Structure of a Ligand-Binding Domain of the Human Polymeric Ig Receptor, pIgR Deposited 2004-09-10	Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 19–127（109 aa） Fragment：N-Terminal Domain I	Not recorded	MG MAGNESIUM ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions pH 6.5；293 K；PEG 8000, Magnesium acetate, cacodylate, pH 6.5, VAPOR DIFFUSION, HANGING DROP, temperature 293K, pH 6.50	Resolution 1.90 Å R-free 0.244
1XED Crystal Structure of a Ligand-Binding Domain of the Human Polymeric Ig Receptor, pIgR Deposited 2004-09-10	Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain B 19–127（109 aa） Fragment：N-Terminal Domain I	Not recorded	MG MAGNESIUM ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions pH 6.5；293 K；PEG 8000, Magnesium acetate, cacodylate, pH 6.5, VAPOR DIFFUSION, HANGING DROP, temperature 293K, pH 6.50	Resolution 1.90 Å R-free 0.244
1XED Crystal Structure of a Ligand-Binding Domain of the Human Polymeric Ig Receptor, pIgR Deposited 2004-09-10	Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 3 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain C 19–127（109 aa） Fragment：N-Terminal Domain I	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions pH 6.5；293 K；PEG 8000, Magnesium acetate, cacodylate, pH 6.5, VAPOR DIFFUSION, HANGING DROP, temperature 293K, pH 6.50	Resolution 1.90 Å R-free 0.244
1XED Crystal Structure of a Ligand-Binding Domain of the Human Polymeric Ig Receptor, pIgR Deposited 2004-09-10	Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 4 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain D 19–127（109 aa） Fragment：N-Terminal Domain I	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions pH 6.5；293 K；PEG 8000, Magnesium acetate, cacodylate, pH 6.5, VAPOR DIFFUSION, HANGING DROP, temperature 293K, pH 6.50	Resolution 1.90 Å R-free 0.244
1XED Crystal Structure of a Ligand-Binding Domain of the Human Polymeric Ig Receptor, pIgR Deposited 2004-09-10	Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 5 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain E 19–127（109 aa） Fragment：N-Terminal Domain I	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions pH 6.5；293 K；PEG 8000, Magnesium acetate, cacodylate, pH 6.5, VAPOR DIFFUSION, HANGING DROP, temperature 293K, pH 6.50	Resolution 1.90 Å R-free 0.244
1XED Crystal Structure of a Ligand-Binding Domain of the Human Polymeric Ig Receptor, pIgR Deposited 2004-09-10	Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 6 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain F 19–127（109 aa） Fragment：N-Terminal Domain I	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions pH 6.5；293 K；PEG 8000, Magnesium acetate, cacodylate, pH 6.5, VAPOR DIFFUSION, HANGING DROP, temperature 293K, pH 6.50	Resolution 1.90 Å R-free 0.244
1XED Crystal Structure of a Ligand-Binding Domain of the Human Polymeric Ig Receptor, pIgR Deposited 2004-09-10	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 7 Protein homooligomer Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 19–127（109 aa） Fragment：N-Terminal Domain I Chain B 19–127（109 aa） Fragment：N-Terminal Domain I Chain C 19–127（109 aa） Fragment：N-Terminal Domain I Chain D 19–127（109 aa） Fragment：N-Terminal Domain I	Not recorded	MG MAGNESIUM ION × 2	X-RAY DIFFRACTION X-ray crystallization conditions pH 6.5；293 K；PEG 8000, Magnesium acetate, cacodylate, pH 6.5, VAPOR DIFFUSION, HANGING DROP, temperature 293K, pH 6.50	Resolution 1.90 Å R-free 0.244
1XED Crystal Structure of a Ligand-Binding Domain of the Human Polymeric Ig Receptor, pIgR Deposited 2004-09-10	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 8 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric	Chain B 19–127（109 aa） Fragment：N-Terminal Domain I Chain D 19–127（109 aa） Fragment：N-Terminal Domain I	Not recorded	MG MAGNESIUM ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions pH 6.5；293 K；PEG 8000, Magnesium acetate, cacodylate, pH 6.5, VAPOR DIFFUSION, HANGING DROP, temperature 293K, pH 6.50	Resolution 1.90 Å R-free 0.244
1XED Crystal Structure of a Ligand-Binding Domain of the Human Polymeric Ig Receptor, pIgR Deposited 2004-09-10	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 9 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric	Chain A 19–127（109 aa） Fragment：N-Terminal Domain I Chain C 19–127（109 aa） Fragment：N-Terminal Domain I	Not recorded	MG MAGNESIUM ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions pH 6.5；293 K；PEG 8000, Magnesium acetate, cacodylate, pH 6.5, VAPOR DIFFUSION, HANGING DROP, temperature 293K, pH 6.50	Resolution 1.90 Å R-free 0.244
2OCW Solution structure of human secretory component Deposited 2006-12-21	Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 19–603（585 aa）	Not recorded	No recorded non-water small molecule	SOLUTION SCATTERING mmCIF provides none of the parsed conditions	Resolution not provided
3CHN Solution structure of human secretory IgA1 Deposited 2008-03-10	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 10 PDB declaration: decameric	Chain J 353–458（106 aa） Fragment：Ig-like V-type domain 4 Chain S 19–603（585 aa）	Not recorded	No recorded non-water small molecule	SOLUTION SCATTERING mmCIF provides none of the parsed conditions	Resolution not provided
3CM9 Solution Structure of Human SIgA2 Deposited 2008-03-21	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 10 PDB declaration: decameric	Chain J 353–458（106 aa） Fragment：Ig-like V-type domain 4 Chain S 19–603（585 aa）	Not recorded	No recorded non-water small molecule	SOLUTION SCATTERING mmCIF provides none of the parsed conditions	Resolution not provided
5D4K Crystal structure of the human polymeric Ig receptor (pIgR) ectodomain Deposited 2015-08-07	Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Monomer；Protein × 1 PDB declaration: monomeric	Chain A 19–565（547 aa） Fragment：ectodomain (UNP residues 19-565)	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 3 SO4 SULFATE ION × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.5；295 K；0.2 M ammonium sulfate, 0.1M BisTris pH 5.5, 31% Polyethylene glycol 3350	Resolution 2.60 Å R-free 0.254
5D4K Crystal structure of the human polymeric Ig receptor (pIgR) ectodomain Deposited 2015-08-07	Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 2 Other combination Monomer；Protein × 1 PDB declaration: monomeric	Chain B 19–565（547 aa） Fragment：ectodomain (UNP residues 19-565)	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 3 SO4 SULFATE ION × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.5；295 K；0.2 M ammonium sulfate, 0.1M BisTris pH 5.5, 31% Polyethylene glycol 3350	Resolution 2.60 Å R-free 0.254
6KXS Cryo-EM structure of human IgM-Fc in complex with the J chain and the ectodomain of pIgR Deposited 2019-09-12	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 12 PDB declaration: dodecameric	Chain P 19–565（547 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	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Insufficient information Heteromer；Protein × 6 PDB declaration: hexameric	Chain P 1–565（565 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	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Insufficient information Heteromer；Protein × 7 PDB declaration: heptameric	Chain P 1–565（565 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	Different oligomeric state Different ligand/ion Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 6 PDB declaration: hexameric	Chain C 19–603（585 aa） Fragment：UNP residues 19-603	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	Different oligomeric state Different ligand/ion	Assembly 1 Other combination Heteromer；Protein × 10 PDB declaration: decameric	Chain C 19–603（585 aa） Fragment：UNP residues 19-603	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	Different oligomeric state Different ligand/ion Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 10 PDB declaration: decameric	Chain C 19–603（585 aa） Fragment：UNP residues 19-603	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
7K0C Structure of Secretory IgM Core Deposited 2020-09-04	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 12 PDB declaration: dodecameric	Chain C 19–603（585 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
7YSG Cryo-EM structure of human FcmR bound to sIgM Deposited 2022-08-12	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 16 PDB declaration: hexadecameric	Chain P 19–559（541 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
8SKU Structure of human SIgA1 in complex with human CD89 (FcaR1) Deposited 2023-04-20	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 8 PDB declaration: octameric	Chain E 19–565（547 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	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 8 PDB declaration: octameric	Chain E 19–565（547 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

15 other PDB entries and 24 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence

UniProt name	PIGR_HUMAN
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain C； PDBConstruct 1–585； UniProt 19–603

Immunoglobulin J chain

Homo sapiens

UniProt P01591

State in the Current Structure

Assembly	Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Associated Components	Method and Experimental Conditions	Structure Quality
1	Other combination Heteromer Protein × 12 其他Polymer 7 PDB declaration: dodecameric（12） Consistent with protein copy count	Chain D； UniProt 23–159	Fragment：UNP residues 23-159	Immunoglobulin heavy constant alpha 2 × 10 （P01877） Polymeric immunoglobulin receptor × 1 （P01833） 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose × 4 beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose × 3 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

Other States of the Same Protein in the Database

Other PDB	Difference from Current Entry 6UEA	Assembly / Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Non-polymers	Method and 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	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 12 PDB declaration: dodecameric	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	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Insufficient information Heteromer；Protein × 6 PDB declaration: hexameric	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	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Insufficient information Heteromer；Protein × 7 PDB declaration: heptameric	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	Different oligomeric state Different ligand/ion Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 6 PDB declaration: hexameric	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	Different oligomeric state Different ligand/ion	Assembly 1 Other combination Heteromer；Protein × 10 PDB declaration: decameric	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	Different oligomeric state Different ligand/ion Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 10 PDB declaration: decameric	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
7K0C Structure of Secretory IgM Core Deposited 2020-09-04	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 12 PDB declaration: dodecameric	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	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 12 PDB declaration: dodecameric	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	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 12 PDB declaration: dodecameric	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	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 12 PDB declaration: dodecameric	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	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 12 PDB declaration: dodecameric	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	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 16 PDB declaration: hexadecameric	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	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 12 PDB declaration: dodecameric	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	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 15 PDB declaration: pentadecameric	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	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 13 PDB declaration: tridecameric	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	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 12 PDB declaration: 12-meric	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	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 6 PDB declaration: hexameric	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	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 8 PDB declaration: octameric	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	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 8 PDB declaration: octameric	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	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Insufficient information Heteromer；Protein × 12 PDB declaration: dodecameric	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	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Insufficient information Heteromer；Protein × 4 PDB declaration: tetrameric	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	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 11 PDB declaration: undecameric	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	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Insufficient information Heteromer；Protein × 6 PDB declaration: hexameric	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

23 other PDB entries and 23 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence

UniProt name	IGJ_HUMAN
Isoform	—
PDB entities	3
Chains and sequence ranges	Author chain D； PDBConstruct 1–137； UniProt 23–159

The page prioritizes protein identity, the current assembly, associated components, oligomeric state and cross-PDB links. Chain mapping and sequence ranges are retained as data evidence. Internal IDs, import timestamps and assembly operation expressions are maintenance fields and are not shown here.

SAXS scattering curve SAXS Profile

P(r) Distance Distribution P(r) Distribution

Download Download SAXS (.dat) P(r) (.pr.out) CIF

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2. Structure Basics 2. Structure Basics

Entry ID entry_id	6uea
Deposition date deposition_date	2019-09-20
Structure title title	Structure of pentameric sIgA complex
Keywords keywords	immunoglobulin, IMMUNE SYSTEM; IMMUNE SYSTEM
Experimental Method method	ELECTRON MICROSCOPY

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3. SAXS Parameters (CRYSOL theoretical calculation) 3. SAXS Parameters (CRYSOL)

Radius of gyration Rg (Guinier) rg_guinier	57.91 Å
Radius of gyration Rg (electron density) rg_electron	57.31 Å
Forward intensity I(0) i0	1348910000.00
Molecular weight molecular_weight	302680.0 kDa
Excluded volume excluded_volume	376910 Å³
Envelope volume envelope_volume	664960 Å³
Hydration-shell volume shell_volume	96342 Å³
Envelope diameter envelope_diameter	192.0 Å
Shell Rg shell_rg	59.02 Å
Envelope Rg envelope_rg	56.83 Å
Shape Rg shape_rg	57.32 Å
Total Rg total_rg	57.31 Å
Total atoms total_atoms	21299
Residues n_residues	2911
Spherical-harmonic order n_harmonics	20
q range q_range	— – 0.5000 Å⁻¹
Data points n_points	101
Shell type shell_type	directional
Solvent electron density solvent_density	0.3340 e/Å³
Shell contrast contrast_shell	0.0300 e/Å³
CRYSOL version crysol_version	4.1.3

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4. P(r) Distance Distribution (GNOM inversion) 4. P(r) Analysis (GNOM)

Maximum dimension Dmax dmax	196.3 Å
Rg (real space) rg_real	57.84 Å
Rg uncertainty (real space) rg_real_error	2.01 Å
I(0) (real space) i0_real	1.3490e+09
I(0) uncertainty (real space) i0_real_error	2.7470e+07
Rg (reciprocal space) rg_reciprocal	57.95 Å
I(0) (reciprocal space) i0_reciprocal	1349000000.0000
Solution quality estimate total_estimate	0.8752
Solution quality rating solution_quality	GOOD a GOOD solution
P(r) peaks n_peaks	1
Primary peak position r_peak_primary	72.7 Å
Skewness Skewness skewness	0.227
Kurtosis Kurtosis kurtosis	-0.507
Angular range angular_range	— – 0.1350 Å⁻¹
Current regularization parameter α current_alpha	0.0000
Highest regularization parameter α highest_alpha	138400000.0000
Real-space data points n_real_points	28
GNOM version gnom_version	4.1.3
Quality Criteria quality_criteria	AN1: 0.000; Oscil: 0.891; Stabil: 1.000; Sysdev: 1.000; Positv: 1.000; Valcen: 0.999; Smooth: 0.701

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5. Crystallography and Experiment 5. Crystallography & Experiment

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6. Entities and Polymers Entities & Polymers (6)

Entity 1 Entity 1 polymer

Description description	Immunoglobulin heavy constant alpha 2
Molecular weight formula_weight	26682.1 kDa
Source method src_method	man
Copy count entity_count	10

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,F,G,K,L,E,H,I,J
Atom count atom_count	21299

DYKDDDDKLVPRGSCHPRLSLHRPALEDLLLGSEANLTCTLTGLRDASGATFTWTPSSGKSAVQGPPERDLCGCYSVSSVLPGCAQPWNHGETFTCTAAHPELKTPLTANITKSGNTFRPEVHLLPPPSEELALNELVTLTCLARGFSPKDVLVRWLQGSQELPREKYLTWASRQEPSQGTTTYAVTSILRVAAEDWKKGETFSCMVGHEALPLAFTQKTIDRLAGKPTHINVSVVMAEADGTCY

来源 Source

来源生物 organism	Homo sapiens
通用名 common_name	Human
NCBI Class编号 ncbi_taxonomy_id	9606
宿主生物 host_organism	Cricetulus griseus

Entity 2 Entity 2 polymer

Description description	Polymeric immunoglobulin receptor
Molecular weight formula_weight	65154.1 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	C

KSPIFGPEEVNSVEGNSVSITCYYPPTSVNRHTRKYWCRQGARGGCITLISSEGYVSSKYAGRANLTNFPENGTFVVNIAQLSQDDSGRYKCGLGINSRGLSFDVSLEVSQGPGLLNDTKVYTVDLGRTVTINCPFKTENAQKRKSLYKQIGLYPVLVIDSSGYVNPNYTGRIRLDIQGTGQLLFSVVINQLRLSDAGQYLCQAGDDSNSNKKNADLQVLKPEPELVYEDLRGSVTFHCALGPEVANVAKFLCRQSSGENCDVVVNTLGKRAPAFEGRILLNPQDKDGSFSVVITGLRKEDAGRYLCGAHSDGQLQEGSPIQAWQLFVNEESTIPRSPTVVKGVAGGSVAVLCPYNRKESKSIKYWCLWEGAQNGRCPLLVDSEGWVKAQYEGRLSLLEEPGNGTFTVILNQLTSRDAGFYWCLTNGDTLWRTTVEIKIIEGEPNLKVPGNVTAVLGETLKVPCHFPCKFSSYEKYWCKWNNTGCQALPSQDEGPSKAFVNCDENSRLVSLTLNLVTRADEGWYWCGVKQGHFYGETAAVYVAVEERKAAGSRDVSLAKADAAPDEKVLDSGFREIENKAIQDPRHHHHHH

来源 Source

来源生物 organism	Homo sapiens
通用名 common_name	Human
NCBI Class编号 ncbi_taxonomy_id	9606
宿主生物 host_organism	Cricetulus griseus

Entity 3 Entity 3 polymer

Description description	Immunoglobulin J chain
Molecular weight formula_weight	15611.5 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	D

QEDERIVLVDNKCKCARITSRIIRSSEDPNEDIVERNIRIIVPLNNRENISDPTSPLRTRFVYHLSDLCKKCDPTEVELDNQIVTATQSNICDEDSATETCYTYDRNKCYTAVVPLVYGGETKMVETALTPDACYPD

来源 Source

来源生物 organism	Homo sapiens
通用名 common_name	Human
NCBI Class编号 ncbi_taxonomy_id	9606
宿主生物 host_organism	Cricetulus griseus

Entity 4 Entity 4 branched

Description description	2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
Molecular weight formula_weight	424.4 kDa
Source method src_method	man
Copy count entity_count	4

Entity 5 Entity 5 branched

Description description	beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
Molecular weight formula_weight	586.5 kDa
Source method src_method	man
Copy count entity_count	3

Entity 6 Entity 6 non-polymer

Description description	2-acetamido-2-deoxy-beta-D-glucopyranose
Molecular weight formula_weight	221.2 kDa
Source method src_method	man
Copy count entity_count	2

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7. Fold Classification (SCOP + CATH) 30 domains

SCOP 2.08 (20 domains)

Domain ID domain_id	d6ueaa1
Class class	b — All beta proteins
Fold Fold fold	b.1 — Immunoglobulin-like beta-sandwich
Superfamily Superfamily superfamily	b.1.1 — Immunoglobulin
Family Family family	b.1.1.0 — automated matches

Domain ID domain_id	d6ueaa2
Class class	b — All beta proteins
Fold Fold fold	b.1 — Immunoglobulin-like beta-sandwich
Superfamily Superfamily superfamily	b.1.1 — Immunoglobulin
Family Family family	b.1.1.2 — C1 set domains (antibody constant domain-like)

Domain ID domain_id	d6ueab1
Class class	b — All beta proteins
Fold Fold fold	b.1 — Immunoglobulin-like beta-sandwich
Superfamily Superfamily superfamily	b.1.1 — Immunoglobulin
Family Family family	b.1.1.0 — automated matches

Domain ID domain_id	d6ueab2
Class class	b — All beta proteins
Fold Fold fold	b.1 — Immunoglobulin-like beta-sandwich
Superfamily Superfamily superfamily	b.1.1 — Immunoglobulin
Family Family family	b.1.1.2 — C1 set domains (antibody constant domain-like)

Domain ID domain_id	d6ueae1
Class class	b — All beta proteins
Fold Fold fold	b.1 — Immunoglobulin-like beta-sandwich
Superfamily Superfamily superfamily	b.1.1 — Immunoglobulin
Family Family family	b.1.1.0 — automated matches

Domain ID domain_id	d6ueae2
Class class	b — All beta proteins
Fold Fold fold	b.1 — Immunoglobulin-like beta-sandwich
Superfamily Superfamily superfamily	b.1.1 — Immunoglobulin
Family Family family	b.1.1.2 — C1 set domains (antibody constant domain-like)

Domain ID domain_id	d6ueaf1
Class class	b — All beta proteins
Fold Fold fold	b.1 — Immunoglobulin-like beta-sandwich
Superfamily Superfamily superfamily	b.1.1 — Immunoglobulin
Family Family family	b.1.1.0 — automated matches

Domain ID domain_id	d6ueaf2
Class class	b — All beta proteins
Fold Fold fold	b.1 — Immunoglobulin-like beta-sandwich
Superfamily Superfamily superfamily	b.1.1 — Immunoglobulin
Family Family family	b.1.1.2 — C1 set domains (antibody constant domain-like)

Domain ID domain_id	d6ueag1
Class class	b — All beta proteins
Fold Fold fold	b.1 — Immunoglobulin-like beta-sandwich
Superfamily Superfamily superfamily	b.1.1 — Immunoglobulin
Family Family family	b.1.1.0 — automated matches

Domain ID domain_id	d6ueag2
Class class	b — All beta proteins
Fold Fold fold	b.1 — Immunoglobulin-like beta-sandwich
Superfamily Superfamily superfamily	b.1.1 — Immunoglobulin
Family Family family	b.1.1.2 — C1 set domains (antibody constant domain-like)

Domain ID domain_id	d6ueah1
Class class	b — All beta proteins
Fold Fold fold	b.1 — Immunoglobulin-like beta-sandwich
Superfamily Superfamily superfamily	b.1.1 — Immunoglobulin
Family Family family	b.1.1.0 — automated matches

Domain ID domain_id	d6ueah2
Class class	b — All beta proteins
Fold Fold fold	b.1 — Immunoglobulin-like beta-sandwich
Superfamily Superfamily superfamily	b.1.1 — Immunoglobulin
Family Family family	b.1.1.2 — C1 set domains (antibody constant domain-like)

Domain ID domain_id	d6ueai1
Class class	b — All beta proteins
Fold Fold fold	b.1 — Immunoglobulin-like beta-sandwich
Superfamily Superfamily superfamily	b.1.1 — Immunoglobulin
Family Family family	b.1.1.0 — automated matches

Domain ID domain_id	d6ueai2
Class class	b — All beta proteins
Fold Fold fold	b.1 — Immunoglobulin-like beta-sandwich
Superfamily Superfamily superfamily	b.1.1 — Immunoglobulin
Family Family family	b.1.1.2 — C1 set domains (antibody constant domain-like)

Domain ID domain_id	d6ueaj1
Class class	b — All beta proteins
Fold Fold fold	b.1 — Immunoglobulin-like beta-sandwich
Superfamily Superfamily superfamily	b.1.1 — Immunoglobulin
Family Family family	b.1.1.0 — automated matches

Domain ID domain_id	d6ueaj2
Class class	b — All beta proteins
Fold Fold fold	b.1 — Immunoglobulin-like beta-sandwich
Superfamily Superfamily superfamily	b.1.1 — Immunoglobulin
Family Family family	b.1.1.2 — C1 set domains (antibody constant domain-like)

Domain ID domain_id	d6ueak1
Class class	b — All beta proteins
Fold Fold fold	b.1 — Immunoglobulin-like beta-sandwich
Superfamily Superfamily superfamily	b.1.1 — Immunoglobulin
Family Family family	b.1.1.0 — automated matches

Domain ID domain_id	d6ueak2
Class class	b — All beta proteins
Fold Fold fold	b.1 — Immunoglobulin-like beta-sandwich
Superfamily Superfamily superfamily	b.1.1 — Immunoglobulin
Family Family family	b.1.1.2 — C1 set domains (antibody constant domain-like)

Domain ID domain_id	d6ueal1
Class class	b — All beta proteins
Fold Fold fold	b.1 — Immunoglobulin-like beta-sandwich
Superfamily Superfamily superfamily	b.1.1 — Immunoglobulin
Family Family family	b.1.1.0 — automated matches

Domain ID domain_id	d6ueal2
Class class	b — All beta proteins
Fold Fold fold	b.1 — Immunoglobulin-like beta-sandwich
Superfamily Superfamily superfamily	b.1.1 — Immunoglobulin
Family Family family	b.1.1.2 — C1 set domains (antibody constant domain-like)

CATH v4.4 (10 domains)

Domain ID domain_id	6ueaA02
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	10 — Immunoglobulins

Domain ID domain_id	6ueaB02
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	10 — Immunoglobulins

Domain ID domain_id	6ueaE02
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	10 — Immunoglobulins

Domain ID domain_id	6ueaF02
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	10 — Immunoglobulins

Domain ID domain_id	6ueaG02
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	10 — Immunoglobulins

Domain ID domain_id	6ueaH02
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	10 — Immunoglobulins

Domain ID domain_id	6ueaI02
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	10 — Immunoglobulins

Domain ID domain_id	6ueaJ02
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	10 — Immunoglobulins

Domain ID domain_id	6ueaK02
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	10 — Immunoglobulins

Domain ID domain_id	6ueaL02
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	10 — Immunoglobulins

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8. Citations (1)

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Unit-cell length a length_a	1.000 Å
Unit-cell length b length_b	1.000 Å
Unit-cell length c length_c	1.000 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.00 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	—

Space group space_group	P 1
Space-group number int_tables_number	1
Crystal system crystal_system	—

Resolution resolution	3.00 Å
Resolution测定方法 resolution_method	—
颗粒数 num_particles	165069

Structure of pentameric sIgA complex

1. Protein Identity and Related Structures Protein Identity & Related Structures

Immunoglobulin heavy constant alpha 2

State in the Current Structure

Other States of the Same Protein in the Database

Polymeric immunoglobulin receptor

State in the Current Structure

Other States of the Same Protein in the Database

Immunoglobulin J chain

State in the Current Structure

Other States of the Same Protein in the Database

SAXS scattering curve SAXS Profile

P(r) Distance Distribution P(r) Distribution

2. Structure Basics 2. Structure Basics

3. SAXS Parameters (CRYSOL theoretical calculation) 3. SAXS Parameters (CRYSOL)

4. P(r) Distance Distribution (GNOM inversion) 4. P(r) Analysis (GNOM)

5. Crystallography and Experiment 5. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

冷冻电镜 EM 3D

6. Entities and Polymers Entities & Polymers (6)

Entity 1 Entity 1 polymer

Polymer Polymer

来源 Source

Entity 2 Entity 2 polymer

Polymer Polymer

来源 Source

Entity 3 Entity 3 polymer

Polymer Polymer

来源 Source

Entity 4 Entity 4 branched

Entity 5 Entity 5 branched

Entity 6 Entity 6 non-polymer

7. Fold Classification (SCOP + CATH) 30 domains

SCOP 2.08 (20 domains)

CATH v4.4 (10 domains)

8. Citations (1)

9. Files and Curves (10)

Files (7)

Curves (3)

fit	/app/data/saxs_computation/ue/6uea/6uea.fit
pddf	/app/data/pr_computation/ue/6uea/6uea.pr.out
profile	/app/data/saxs_computation/ue/6uea/6uea.dat