SAXSdb — 4j6n

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

Low affinity immunoglobulin epsilon Fc receptor

Homo sapiens

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein monomer	Monomer	Protein 1	No other associated polymer	Consistent with protein count
2	Protein monomer	Monomer	Protein 1	No other associated polymer	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	FCER2_HUMAN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–143； UniProt 156–298 Author chain B； PDBConstruct 1–143； UniProt 156–298

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	4j6n
Deposition date deposition_date	2013-02-11
Structure title title	Crystal structure of calcium2+-free wild-type CD23 lectin domain (crystal form E)
Keywords keywords	immunoglobulin fold lectin, antibody receptor, immune system; IMMUNE SYSTEM
Experimental Method method	X-RAY DIFFRACTION

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3. Official assembly/model SAXS Official SAXS Profiles

This page reads only the latest assembly calculations. Every curve maps to an explicit PDB entry, official biological assembly and coordinate model.

4j6n__assembly_2__model_1

Assembly 2 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

4j6n__assembly_2__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

4j6n__assembly_2__model_1 | P(r) · Pending

P(r) will be calculated and displayed separately for the same assembly/model.

Rg（Guinier）	15.83 Å
Rg (electron density)	14.88 Å
Total Rg	16.05 Å
Atom count	1083
Residues	135
Excluded volume	18888 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`4j6n__assembly_1__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`4j6n__assembly_2__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download

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4. Crystallography and Experiment 4. Crystallography & Experiment

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5. Entities and Polymers Entities & Polymers (1)

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6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d4j6na_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.169 — C-type lectin-like
Superfamily Superfamily superfamily	d.169.1 — C-type lectin-like
Family Family family	d.169.1.1 — C-type lectin domain

Domain ID domain_id	d4j6nb_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.169 — C-type lectin-like
Superfamily Superfamily superfamily	d.169.1 — C-type lectin-like
Family Family family	d.169.1.1 — C-type lectin domain

CATH v4.4 (2 domains)

Domain ID domain_id	4j6nA01
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	100 — Mannose-Binding Protein A; Chain A
Homologous superfamily homologous superfamily	10 — Mannose-Binding Protein A, subunit A

Domain ID domain_id	4j6nB01
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	100 — Mannose-Binding Protein A; Chain A
Homologous superfamily homologous superfamily	10 — Mannose-Binding Protein A, subunit A

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Unit-cell length a length_a	64.260 Å
Unit-cell length b length_b	73.070 Å
Unit-cell length c length_c	57.040 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	8

Space group space_group	P 21 21 2
Space-group number int_tables_number	18
Crystal system crystal_system	—

Resolution resolution	2.850 Å
Low-resolution limit resolution_low	48.250 Å
R factor r_factor	0.2583
R_work r_work	0.2518
R_free r_free	0.3169

Description description	Low affinity immunoglobulin epsilon Fc receptor
Molecular weight formula_weight	16165.0 kDa
Source method src_method	man
Copy count entity_count	2

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B
Atom count atom_count	2186

Crystal structure of calcium2+-free wild-type CD23 lectin domain (crystal form E)

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

Low affinity immunoglobulin epsilon Fc receptor

State in the Current Structure

Other States of the Same Protein in the Database

2. Structure Basics 2. Structure Basics

3. Official assembly/model SAXS Official SAXS Profiles

4j6n__assembly_2__model_1

4j6n__assembly_2__model_1 | I(q)

4j6n__assembly_2__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

Diffraction experiment Diffraction

5. Entities and Polymers Entities & Polymers (1)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)

Source organism organism	Homo sapiens
Common name common_name	human
NCBI taxonomy ID ncbi_taxonomy_id	9606
Host organism host_organism	Escherichia coli

Crystal structure of calcium2+-free wild-type CD23 lectin domain (crystal form E)

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

Low affinity immunoglobulin epsilon Fc receptor

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

2. Structure Basics 2. Structure Basics

3. Official assembly/model SAXS Official SAXS Profiles

4j6n__assembly_2__model_1

4j6n__assembly_2__model_1 | I(q)

4j6n__assembly_2__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

Diffraction experiment Diffraction

5. Entities and Polymers Entities & Polymers (1)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)