SAXSdb — 1xxa

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

ARGININE REPRESSOR

Escherichia coli K12

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 LEAD (II) ION × 4 water × 6	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	ARGR_ECOLI
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 2–78； UniProt 80–156 Author chain B； PDBConstruct 2–78； UniProt 80–156 Author chain C； PDBConstruct 2–78； UniProt 80–156 Author chain D； PDBConstruct 2–78； UniProt 80–156 Author chain E； PDBConstruct 2–78； UniProt 80–156 Author chain F； PDBConstruct 2–78； UniProt 80–156

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	1xxa
Deposition date deposition_date	1995-11-03
Structure title title	C-TERMINAL DOMAIN OF ESCHERICHIA COLI ARGININE REPRESSOR/ L-ARGININE COMPLEX; PB DERIVATIVE
Keywords keywords	COMPLEX (DNA BINDING PROTEIN-PEPTIDE), COMPLEX (DNA BINDING PROTEIN-PEPTIDE) complex; COMPLEX (DNA BINDING PROTEIN/PEPTIDE)
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.

1xxa__assembly_1__model_1

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

Download this curve (.dat)

1xxa__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1xxa__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	22.64 Å
Rg (electron density)	21.58 Å
Total Rg	22.62 Å
Atom count	3290
Residues	429
Excluded volume	59556 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1xxa__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 (4)

Entity 1 Entity 1 polymer

Description description	ARGININE REPRESSOR
Molecular weight formula_weight	8351.5 kDa
Source method src_method	man
Copy count entity_count	6

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C,D,E,F
Atom count atom_count	3705

MSPLKNLVLDIDYNDAVVVIHTSPGAAQLIARLLDSLGKAEGILGTIAGDDTIFTTPANGFTVKDLYEAILELFDQEL

Source Source

Source organism organism	Escherichia coli K12
NCBI taxonomy ID ncbi_taxonomy_id	83333
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 non-polymer

Description description	ARGININE
Molecular weight formula_weight	175.2 kDa
Source method src_method	syn
Copy count entity_count	6

Entity 3 Entity 3 non-polymer

Description description	LEAD (II) ION
Molecular weight formula_weight	207.2 kDa
Source method src_method	syn
Copy count entity_count	4

Entity 4 Entity 4 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	415

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6. Fold Classification (SCOP + CATH) 12 domains

SCOP 2.08 (6 domains)

Domain ID domain_id	d1xxaa_
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	d1xxab_
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	d1xxac_
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	d1xxad_
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	d1xxae_
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	d1xxaf_
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 (6 domains)

Domain ID domain_id	1xxaA00
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	1xxaB00
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	1xxaC00
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	1xxaD00
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	1xxaE00
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	1xxaF00
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	53.500 Å
Unit-cell length b length_b	83.800 Å
Unit-cell length c length_c	217.000 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	48

Space group space_group	C 2 2 21
Space-group number int_tables_number	20
Crystal system crystal_system	—

Resolution resolution	2.200 Å
Low-resolution limit resolution_low	8.000 Å
R factor r_factor	0.2000
R_work r_work	0.2000
R_free r_free	0.3300

C-TERMINAL DOMAIN OF ESCHERICHIA COLI ARGININE REPRESSOR/ L-ARGININE COMPLEX; PB DERIVATIVE

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

1xxa__assembly_1__model_1

1xxa__assembly_1__model_1 | I(q)

1xxa__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 (4)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 water

6. Fold Classification (SCOP + CATH) 12 domains

SCOP 2.08 (6 domains)

CATH v4.4 (6 domains)

7. Citations (3)

C-TERMINAL DOMAIN OF ESCHERICHIA COLI ARGININE REPRESSOR/ L-ARGININE COMPLEX; PB DERIVATIVE

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

1xxa__assembly_1__model_1

1xxa__assembly_1__model_1 | I(q)

1xxa__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 (4)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 water

6. Fold Classification (SCOP + CATH) 12 domains

SCOP 2.08 (6 domains)

CATH v4.4 (6 domains)

7. Citations (3)