SAXSdb — 5d4k

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

Polymeric immunoglobulin receptor

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 Monomer Protein × 1 其他Polymer 1 PDB declaration: monomeric（1） Consistent with protein copy count	Chain A； UniProt 19–565	Fragment：ectodomain (UNP residues 19-565)	alpha-L-fucopyranose-(1-6)-2-acetamido-2-deoxy-beta-D-glucopyranose × 1 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
2	Other combination Monomer Protein × 1 其他Polymer 1 PDB declaration: monomeric（1） Consistent with protein copy count	Chain B； UniProt 19–565	Fragment：ectodomain (UNP residues 19-565)	alpha-L-fucopyranose-(1-6)-2-acetamido-2-deoxy-beta-D-glucopyranose × 1 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

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 5D4K	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 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 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 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 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 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 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 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 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 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
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 method 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 method 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 method 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 construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions 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 construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions 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 × 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 oligomeric state Different ligand/ion Different experimental method Different experimental conditions 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
6UEA Structure of pentameric sIgA complex Deposited 2019-09-20	Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 12 PDB declaration: dodecameric	Chain C 19–603（585 aa） Fragment：UNP residues 19-603	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	Different construct Different oligomeric state Different ligand/ion Different experimental method 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 method 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 method 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 method 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 23 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence

UniProt name	PIGR_HUMAN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–547； UniProt 19–565 Author chain B； PDBConstruct 1–547； UniProt 19–565

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.

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2. Structure Basics 2. Structure Basics

Entry ID entry_id	5d4k
Deposition date deposition_date	2015-08-07
Structure title title	Crystal structure of the human polymeric Ig receptor (pIgR) ectodomain
Keywords keywords	Ig Super Family (IgSF), polymeric Ig-binding protein, mucosal immunity, Secretory Component, IMMUNE SYSTEM; IMMUNE SYSTEM
Experimental Method method	X-RAY DIFFRACTION

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

Radius of gyration Rg (Guinier) rg_guinier	40.54 Å
Radius of gyration Rg (electron density) rg_electron	40.61 Å
Forward intensity I(0) i0	230930000.00
Molecular weight molecular_weight	120550.0 kDa
Excluded volume excluded_volume	149690 Å³
Envelope volume envelope_volume	213870 Å³
Hydration-shell volume shell_volume	46027 Å³
Envelope diameter envelope_diameter	155.9 Å
Shell Rg shell_rg	44.08 Å
Envelope Rg envelope_rg	39.66 Å
Shape Rg shape_rg	40.60 Å
Total Rg total_rg	40.81 Å
Total atoms total_atoms	16686
Residues n_residues	1075
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	146.0 Å
Rg (real space) rg_real	40.73 Å
Rg uncertainty (real space) rg_real_error	1.71 Å
I(0) (real space) i0_real	2.3090e+08
I(0) uncertainty (real space) i0_real_error	4.7340e+06
Rg (reciprocal space) rg_reciprocal	40.54 Å
I(0) (reciprocal space) i0_reciprocal	230900000.0000
Solution quality estimate total_estimate	0.8479
Solution quality rating solution_quality	GOOD a GOOD solution
P(r) peaks n_peaks	2
Primary peak position r_peak_primary	48.7 Å
Skewness Skewness skewness	0.483
Kurtosis Kurtosis kurtosis	-0.103
Angular range angular_range	— – 0.1950 Å⁻¹
Current regularization parameter α current_alpha	0.0000
Highest regularization parameter α highest_alpha	16410000.0000
Real-space data points n_real_points	40
GNOM version gnom_version	4.1.3
Quality Criteria quality_criteria	AN1: 0.000; Oscil: 0.774; Stabil: 1.000; Sysdev: 1.000; Positv: 1.000; Valcen: 0.812; Smooth: 0.884

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5. Crystallography and Experiment 5. Crystallography & Experiment

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6. Entities and Polymers Entities & Polymers (5)

Entity 1 Entity 1 polymer

Description description	Polymeric immunoglobulin receptor
Molecular weight formula_weight	61483.0 kDa
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B
Atom count atom_count	16744

KSPIFGPEEVNSVEGNSVSITCYYPPTSVNRHTRKYWCRQGARGGCITLISSEGYVSSKYAGRANLTNFPENGTFVVNIAQLSQDDSGRYKCGLGINSRGLSFDVSLEVSQGPGLLNDTKVYTVDLGRTVTINCPFKTENAQKRKSLYKQIGLYPVLVIDSSGYVNPNYTGRIRLDIQGTGQLLFSVVINQLRLSDAGQYLCQAGDDSNSNKKNADLQVLKPEPELVYEDLRGSVTFHCALGPEVANVAKFLCRQSSGENCDVVVNTLGKRAPAFEGRILLNPQDKDGSFSVVITGLRKEDAGRYLCGAHSDGQLQEGSPIQAWQLFVNEESTIPRSPTVVKGVAGSSVAVLCPYNRKESKSIKYWCLWEGAQNGRCPLLVDSEGWVKAQYEGRLSLLEEPGNGTFTVILNQLTSRDAGFYWCLTNGDTLWRTTVEIKIIEGEPNLKVPGNVTAVLGETLKVPCHFPCKFSSYEKYWCKWNNTGCQALPSQDEGPSKAFVNCDENSRLVSLTLNLVTRADEGWYWCGVKQGHFYGETAAVYVAVEERGSWSHPQFEK

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	Homo sapiens

Entity 2 Entity 2 branched

Description description	alpha-L-fucopyranose-(1-6)-2-acetamido-2-deoxy-beta-D-glucopyranose
Molecular weight formula_weight	367.3 kDa
Source method src_method	man
Copy count entity_count	2

Entity 3 Entity 3 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	6

Entity 4 Entity 4 non-polymer

Description description	SULFATE ION
Molecular weight formula_weight	96.1 kDa
Source method src_method	syn
Copy count entity_count	4

Entity 5 Entity 5 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	58

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7. Fold Classification (SCOP + CATH) 4 domains

CATH v4.4 (4 domains)

Domain ID domain_id	5d4kA01
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	10 — Immunoglobulins

Domain ID domain_id	5d4kA02
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	10 — Immunoglobulins

Domain ID domain_id	5d4kB01
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	10 — Immunoglobulins

Domain ID domain_id	5d4kB02
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	61.258 Å
Unit-cell length b length_b	242.434 Å
Unit-cell length c length_c	63.046 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	114.89 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	4

Space group space_group	P 1 21 1
Space-group number int_tables_number	4
Crystal system crystal_system	—

Resolution resolution	2.599 Å
Low-resolution limit resolution_low	36.984 Å
R factor r_factor	0.2032
R_work r_work	0.2009
R_free r_free	0.2536

fit	/app/data/saxs_computation/d4/5d4k/5d4k.fit
pddf	/app/data/pr_computation/d4/5d4k/5d4k.pr.out
profile	/app/data/saxs_computation/d4/5d4k/5d4k.dat

Crystal structure of the human polymeric Ig receptor (pIgR) ectodomain

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

Polymeric immunoglobulin receptor

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

Refinement Refinement

Diffraction experiment Diffraction