SAXSdb — 1q8r

▼

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

Crossover junction endodeoxyribonuclease rusA

Escherichia coli

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	RUS_ECOLI
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–120； UniProt 1–120 Author chain B； PDBConstruct 1–120； UniProt 1–120

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.

▼

2. Structure Basics 2. Structure Basics

Entry ID entry_id	1q8r
Deposition date deposition_date	2003-08-22
Structure title title	Structure of E.coli RusA Holliday junction resolvase
Keywords keywords	extended mixed beta sheet, chorismate mutase-like fold, RECOMBINATION, HYDROLASE; RECOMBINATION,HYDROLASE
Experimental Method method	X-RAY DIFFRACTION

▼

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.

1q8r__assembly_1__model_1

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

Download this curve (.dat)

1q8r__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1q8r__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	19.09 Å
Rg (electron density)	17.92 Å
Total Rg	18.94 Å
Atom count	1757
Residues	227
Excluded volume	31276 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1q8r__assembly_1__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download

▶

4. Crystallography and Experiment 4. Crystallography & Experiment

▶

5. Entities and Polymers Entities & Polymers (2)

▼

6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d1q8ra_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.79 — Bacillus chorismate mutase-like
Superfamily Superfamily superfamily	d.79.6 — Holliday junction resolvase RusA
Family Family family	d.79.6.1 — Holliday junction resolvase RusA

Domain ID domain_id	d1q8rb_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.79 — Bacillus chorismate mutase-like
Superfamily Superfamily superfamily	d.79.6 — Holliday junction resolvase RusA
Family Family family	d.79.6.1 — Holliday junction resolvase RusA

CATH v4.4 (2 domains)

Domain ID domain_id	1q8rA00
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	1330 — 60s Ribosomal Protein L30; Chain: A;
Homologous superfamily homologous superfamily	70 — Holliday junction resolvase RusA

Domain ID domain_id	1q8rB00
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	1330 — 60s Ribosomal Protein L30; Chain: A;
Homologous superfamily homologous superfamily	70 — Holliday junction resolvase RusA

▶

Unit-cell length a length_a	45.352 Å
Unit-cell length b length_b	50.052 Å
Unit-cell length c length_c	49.597 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	101.42 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	4

Space group space_group	P 1 21 1
Space-group number int_tables_number	4
Crystal system crystal_system	—

Resolution resolution	1.899 Å
Low-resolution limit resolution_low	48.800 Å
R factor r_factor	0.1920
R_work r_work	0.1901
R_free r_free	0.2262

Description description	Crossover junction endodeoxyribonuclease rusA
Molecular weight formula_weight	13867.9 kDa
EC 编号 ec_number	3.1.22.-
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	1888

Structure of E.coli RusA Holliday junction resolvase

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

Crossover junction endodeoxyribonuclease rusA

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

1q8r__assembly_1__model_1

1q8r__assembly_1__model_1 | I(q)

1q8r__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 (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	Escherichia coli
NCBI taxonomy ID ncbi_taxonomy_id	562
Host organism host_organism	Escherichia coli

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	131

Structure of E.coli RusA Holliday junction resolvase

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

Crossover junction endodeoxyribonuclease rusA

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

1q8r__assembly_1__model_1

1q8r__assembly_1__model_1 | I(q)

1q8r__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 (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)