SAXSdb — 1if1

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

PROTEIN (INTERFERON REGULATORY FACTOR 1)

Mus musculus

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein–DNA	Homooligomer	Protein 2 DNA 2	DNA (26-MER) × 2 water × 4	Consistent with all polymers

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	IRF1_MOUSE
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain A； PDBConstruct 1–113； UniProt 1–113 Author chain B； PDBConstruct 1–113； UniProt 1–113

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	1if1
Deposition date deposition_date	1997-09-12
Structure title title	INTERFERON REGULATORY FACTOR 1 (IRF-1) COMPLEX WITH DNA
Keywords keywords	COMPLEX (DNA-BINDING PROTEIN-DNA), TRANSCRIPTION FACTOR, INTERFERON REGULATION, HELIX-TURN-HELIX, TRANSCRIPTION-DNA COMPLEX; TRANSCRIPTION/DNA
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.

1if1__assembly_1__model_1

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

Download this curve (.dat)

1if1__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1if1__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	25.67 Å
Rg (electron density)	25.44 Å
Total Rg	26.03 Å
Atom count	2769
Residues	261
Excluded volume	45853 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1if1__assembly_1__model_1`	tetrameric （4）	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 (3)

Entity 1 Entity 1 polymer

Description description	DNA (26-MER)
Molecular weight formula_weight	7986.2 kDa
Source method src_method	syn
Copy count entity_count	2

Polymer Polymer

Polymer type type	polydeoxyribonucleotide
Chain IDs strand_id	C,D
Atom count atom_count	2779

GAGAAGTGAAAGTACTTTCACTTCTC

Entity 2 Entity 2 polymer

Description description	PROTEIN (INTERFERON REGULATORY FACTOR 1)
Molecular weight formula_weight	13419.6 kDa
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B

MPITWMRMRPWLEMQINSNQIPGLIWINKEEMIFQIPWKHAAKHGWDINKDACLFRSWAIHTGRYKAGEKEPDPKTWKANFRCAMNSLPDIEEVKDQSRNKGSSAVRVYRMLP

Source Source

Source organism organism	Mus musculus
Common name common_name	house mouse
NCBI taxonomy ID ncbi_taxonomy_id	10090
Host organism host_organism	Escherichia coli

Entity 3 Entity 3 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	10

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6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d1if1a_
Class class	a — All alpha proteins
Fold Fold fold	a.4 — DNA/RNA-binding 3-helical bundle
Superfamily Superfamily superfamily	a.4.5 — 'Winged helix' DNA-binding domain
Family Family family	a.4.5.23 — Interferon regulatory factor

Domain ID domain_id	d1if1b_
Class class	a — All alpha proteins
Fold Fold fold	a.4 — DNA/RNA-binding 3-helical bundle
Superfamily Superfamily superfamily	a.4.5 — 'Winged helix' DNA-binding domain
Family Family family	a.4.5.23 — Interferon regulatory factor

CATH v4.4 (2 domains)

Domain ID domain_id	1if1A00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	10 — Arc Repressor Mutant, subunit A
Homologous superfamily homologous superfamily	10 — Winged helix-like DNA-binding domain superfamily/Winged helix DNA-binding domain

Domain ID domain_id	1if1B00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	10 — Arc Repressor Mutant, subunit A
Homologous superfamily homologous superfamily	10 — Winged helix-like DNA-binding domain superfamily/Winged helix DNA-binding domain

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Unit-cell length a length_a	84.800 Å
Unit-cell length b length_b	84.800 Å
Unit-cell length c length_c	203.700 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.00 °
Unit-cell angle γ angle_gamma	120.00 °
Molecules per unit cell Z z_pdb	18

Space group space_group	H 3
Space-group number int_tables_number	146
Crystal system crystal_system	—

Resolution resolution	3.000 Å
Low-resolution limit resolution_low	12.000 Å
R factor r_factor	0.2420
R_work r_work	0.2420
R_free r_free	0.3090

INTERFERON REGULATORY FACTOR 1 (IRF-1) COMPLEX WITH DNA

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

PROTEIN (INTERFERON REGULATORY FACTOR 1)

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

1if1__assembly_1__model_1

1if1__assembly_1__model_1 | I(q)

1if1__assembly_1__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 (3)

Entity 1 Entity 1 polymer

Polymer Polymer

Entity 2 Entity 2 polymer

Polymer Polymer

Source Source

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (2)

INTERFERON REGULATORY FACTOR 1 (IRF-1) COMPLEX WITH DNA

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

PROTEIN (INTERFERON REGULATORY FACTOR 1)

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

1if1__assembly_1__model_1

1if1__assembly_1__model_1 | I(q)

1if1__assembly_1__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 (3)

Entity 1 Entity 1 polymer

Polymer Polymer

Entity 2 Entity 2 polymer

Polymer Polymer

Source Source

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (2)