SAXSdb — 1ilr

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

INTERLEUKIN-1 RECEPTOR ANTAGONIST PROTEIN

Homo sapiens

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 2	water × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	IL1RA_HUMAN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain 1； PDBConstruct 1–152； UniProt 26–177 Author chain 2； PDBConstruct 1–152； UniProt 26–177

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	1ilr
Deposition date deposition_date	1994-06-20
Structure title title	CRYSTAL STRUCTURE OF THE INTERLEUKIN-1 RECEPTOR ANTAGONIST
Keywords keywords	BINDING PROTEIN; BINDING PROTEIN
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.

1ilr__assembly_1__model_1

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

Download this curve (.dat)

1ilr__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1ilr__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	23.04 Å
Rg (electron density)	22.32 Å
Total Rg	23.05 Å
Atom count	2285
Residues	289
Excluded volume	40527 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1ilr__assembly_1__model_1`	dimeric （2）	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 (2)

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6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d1ilr1_
Class class	b — All beta proteins
Fold Fold fold	b.42 — beta-Trefoil
Superfamily Superfamily superfamily	b.42.1 — Cytokine
Family Family family	b.42.1.2 — Interleukin-1 (IL-1)

Domain ID domain_id	d1ilr2_
Class class	b — All beta proteins
Fold Fold fold	b.42 — beta-Trefoil
Superfamily Superfamily superfamily	b.42.1 — Cytokine
Family Family family	b.42.1.2 — Interleukin-1 (IL-1)

CATH v4.4 (2 domains)

Domain ID domain_id	1ilr100
Class class	2 — Mainly Beta
Architecture architecture	80 — Trefoil
Topology topology	10 — Trefoil (Acidic Fibroblast Growth Factor, subunit A)
Homologous superfamily homologous superfamily	50 —

Domain ID domain_id	1ilr200
Class class	2 — Mainly Beta
Architecture architecture	80 — Trefoil
Topology topology	10 — Trefoil (Acidic Fibroblast Growth Factor, subunit A)
Homologous superfamily homologous superfamily	50 —

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Unit-cell length a length_a	71.300 Å
Unit-cell length b length_b	71.300 Å
Unit-cell length c length_c	117.300 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	16

Space group space_group	P 43 21 2
Space-group number int_tables_number	96
Crystal system crystal_system	—

Resolution resolution	2.100 Å
Low-resolution limit resolution_low	8.000 Å
R factor r_factor	0.1970
R_work r_work	0.1970
R_free r_free	—

Description description	INTERLEUKIN-1 RECEPTOR ANTAGONIST PROTEIN
Molecular weight formula_weight	17145.4 kDa
Source method src_method	man
Copy count entity_count	2

Polymer type type	polypeptide(L)
Chain IDs strand_id	1,2
Atom count atom_count	2424

CRYSTAL STRUCTURE OF THE INTERLEUKIN-1 RECEPTOR ANTAGONIST

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

INTERLEUKIN-1 RECEPTOR ANTAGONIST PROTEIN

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

1ilr__assembly_1__model_1

1ilr__assembly_1__model_1 | I(q)

1ilr__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

5. Entities and Polymers Entities & Polymers (2)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 water

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

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	139

CRYSTAL STRUCTURE OF THE INTERLEUKIN-1 RECEPTOR ANTAGONIST

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

INTERLEUKIN-1 RECEPTOR ANTAGONIST PROTEIN

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

1ilr__assembly_1__model_1

1ilr__assembly_1__model_1 | I(q)

1ilr__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

5. Entities and Polymers Entities & Polymers (2)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 water

6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)