SAXSdb — 2rec

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

RECA

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	No other associated polymer	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	RECA_ECOLI
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 2–353； UniProt 1–352 Author chain B； PDBConstruct 2–353； UniProt 1–352 Author chain C； PDBConstruct 2–353； UniProt 1–352 Author chain D； PDBConstruct 2–353； UniProt 1–352 Author chain E； PDBConstruct 2–353； UniProt 1–352 Author chain F； PDBConstruct 2–353； UniProt 1–352

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	2rec
Deposition date deposition_date	1996-12-03
Structure title title	RECA HEXAMER MODEL, ELECTRON MICROSCOPY
Keywords keywords	HELICASE, DNA DAMAGE, DNA RECOMBINATION, SOS RESPONSE, ATP-BINDING, DNA-BINDING; HELICASE
Experimental Method method	ELECTRON MICROSCOPY

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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.

2rec__assembly_1__model_1

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

Download this curve (.dat)

2rec__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

2rec__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	44.89 Å
Rg (electron density)	44.26 Å
Total Rg	44.46 Å
Atom count	0
Residues	0
Excluded volume	241280 Å³
Maximum q	0.500 Å⁻¹

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

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6. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (6 domains)

Domain ID domain_id	d2reca_
Class class	i — Low resolution protein structures
Fold Fold fold	i.2 — Helicase
Superfamily Superfamily superfamily	i.2.1 — Helicase
Family Family family	i.2.1.1 — Helicase

Domain ID domain_id	d2recb_
Class class	i — Low resolution protein structures
Fold Fold fold	i.2 — Helicase
Superfamily Superfamily superfamily	i.2.1 — Helicase
Family Family family	i.2.1.1 — Helicase

Domain ID domain_id	d2recc_
Class class	i — Low resolution protein structures
Fold Fold fold	i.2 — Helicase
Superfamily Superfamily superfamily	i.2.1 — Helicase
Family Family family	i.2.1.1 — Helicase

Domain ID domain_id	d2recd_
Class class	i — Low resolution protein structures
Fold Fold fold	i.2 — Helicase
Superfamily Superfamily superfamily	i.2.1 — Helicase
Family Family family	i.2.1.1 — Helicase

Domain ID domain_id	d2rece_
Class class	i — Low resolution protein structures
Fold Fold fold	i.2 — Helicase
Superfamily Superfamily superfamily	i.2.1 — Helicase
Family Family family	i.2.1.1 — Helicase

Domain ID domain_id	d2recf_
Class class	i — Low resolution protein structures
Fold Fold fold	i.2 — Helicase
Superfamily Superfamily superfamily	i.2.1 — Helicase
Family Family family	i.2.1.1 — Helicase

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Unit-cell length a length_a	1.000 Å
Unit-cell length b length_b	1.000 Å
Unit-cell length c length_c	1.000 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	1

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

Description description	RECA
Molecular weight formula_weight	38016.3 kDa
Source method src_method	nat
Copy count entity_count	6

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C,D,E,F
Atom count atom_count	1818

RECA HEXAMER MODEL, ELECTRON MICROSCOPY

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

RECA

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

2rec__assembly_1__model_1

2rec__assembly_1__model_1 | I(q)

2rec__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

5. Entities and Polymers Entities & Polymers (1)

Entity 1 Entity 1 polymer

Polymer Polymer

6. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (6 domains)

7. Citations (1)

RECA HEXAMER MODEL, ELECTRON MICROSCOPY

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

RECA

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

2rec__assembly_1__model_1

2rec__assembly_1__model_1 | I(q)

2rec__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

5. Entities and Polymers Entities & Polymers (1)

Entity 1 Entity 1 polymer

Polymer Polymer

6. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (6 domains)

7. Citations (1)