SAXSdb — 1b4b

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

ARGININE REPRESSOR

OrganismNot specified

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 6	ARGININE × 6 water × 6	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	ARGR_BACST
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–71； UniProt 79–149 Author chain B； PDBConstruct 1–71； UniProt 79–149 Author chain C； PDBConstruct 1–71； UniProt 79–149

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	1b4b
Deposition date deposition_date	1998-12-18
Structure title title	STRUCTURE OF THE OLIGOMERIZATION DOMAIN OF THE ARGININE REPRESSOR FROM BACILLUS STEAROTHERMOPHILUS
Keywords keywords	REPRESSOR, ARGININE, CORE, OLIGOMERIZATION DOMAIN, HELIX TURN HELIX; REPRESSOR
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.

1b4b__assembly_1__model_1

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

Download this curve (.dat)

1b4b__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1b4b__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	22.12 Å
Rg (electron density)	21.49 Å
Total Rg	22.37 Å
Atom count	3270
Residues	426
Excluded volume	59325 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1b4b__assembly_1__model_1`	hexameric （6）	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)

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6. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (3 domains)

Domain ID domain_id	d1b4ba_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.74 — DCoH-like
Superfamily Superfamily superfamily	d.74.2 — C-terminal domain of arginine repressor
Family Family family	d.74.2.1 — C-terminal domain of arginine repressor

Domain ID domain_id	d1b4bb_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.74 — DCoH-like
Superfamily Superfamily superfamily	d.74.2 — C-terminal domain of arginine repressor
Family Family family	d.74.2.1 — C-terminal domain of arginine repressor

Domain ID domain_id	d1b4bc_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.74 — DCoH-like
Superfamily Superfamily superfamily	d.74.2 — C-terminal domain of arginine repressor
Family Family family	d.74.2.1 — C-terminal domain of arginine repressor

CATH v4.4 (3 domains)

Domain ID domain_id	1b4bA00
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	1360 — Gyrase A; domain 2
Homologous superfamily homologous superfamily	40 —

Domain ID domain_id	1b4bB00
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	1360 — Gyrase A; domain 2
Homologous superfamily homologous superfamily	40 —

Domain ID domain_id	1b4bC00
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	1360 — Gyrase A; domain 2
Homologous superfamily homologous superfamily	40 —

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Unit-cell length a length_a	82.000 Å
Unit-cell length b length_b	82.000 Å
Unit-cell length c length_c	67.200 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	24

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

Resolution resolution	2.200 Å
Low-resolution limit resolution_low	8.000 Å
R factor r_factor	0.2180
R_work r_work	0.2180
R_free r_free	0.2660

Description description	ARGININE REPRESSOR
Molecular weight formula_weight	7640.9 kDa
Source method src_method	nat
Copy count entity_count	3

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C
Atom count atom_count	1835

STRUCTURE OF THE OLIGOMERIZATION DOMAIN OF THE ARGININE REPRESSOR FROM BACILLUS STEAROTHERMOPHILUS

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

ARGININE REPRESSOR

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

1b4b__assembly_1__model_1

1b4b__assembly_1__model_1 | I(q)

1b4b__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 non-polymer

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (3 domains)

CATH v4.4 (3 domains)

7. Citations (2)

Description description	ARGININE
Molecular weight formula_weight	175.2 kDa
Source method src_method	syn
Copy count entity_count	3

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	200

STRUCTURE OF THE OLIGOMERIZATION DOMAIN OF THE ARGININE REPRESSOR FROM BACILLUS STEAROTHERMOPHILUS

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

ARGININE REPRESSOR

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

1b4b__assembly_1__model_1

1b4b__assembly_1__model_1 | I(q)

1b4b__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 non-polymer

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (3 domains)

CATH v4.4 (3 domains)

7. Citations (2)