SAXSdb — 6cbr

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

DNA primase,single-stranded DNA-binding protein chimera

Escherichia coli (strain K12)

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Insufficient information	Monomer	Protein 1	water × 1	Consistent with protein count
2	Insufficient information	Monomer	Protein 1	water × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	A0A0K3FKM0_ECOLX
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 158–166； UniProt 131–139 Author chain B； PDBConstruct 158–166； UniProt 131–139

DNA primase,single-stranded DNA-binding protein chimera

Escherichia coli (strain K12)

UniProt P0ABS5

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Insufficient information	Monomer	Protein 1	water × 1	Consistent with protein count
2	Insufficient information	Monomer	Protein 1	water × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	DNAG_ECOLI
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–148； UniProt 434–581 Author chain B； PDBConstruct 1–148； UniProt 434–581

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	6cbr
Deposition date deposition_date	2018-02-05
Structure title title	DnaG Primase C-terminal domain complex with SSB C-terminal peptide
Keywords keywords	Primase, DnaG, Single-strand DNA-Binding Protein, SSB, Complex, REPLICATION; REPLICATION
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.

6cbr__assembly_1__model_1

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

Download this curve (.dat)

6cbr__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

6cbr__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	18.59 Å
Rg (electron density)	17.46 Å
Total Rg	18.21 Å
Atom count	1144
Residues	144
Excluded volume	20383 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`6cbr__assembly_1__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`6cbr__assembly_2__model_1`	monomeric （1）	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 (2)

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6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d6cbra1
Class class	a — All alpha proteins
Fold Fold fold	a.236 — DNA primase DnaG, C-terminal domain
Superfamily Superfamily superfamily	a.236.1 — DNA primase DnaG, C-terminal domain
Family Family family	a.236.1.1 — DNA primase DnaG, C-terminal domain

Domain ID domain_id	d6cbrb1
Class class	a — All alpha proteins
Fold Fold fold	a.236 — DNA primase DnaG, C-terminal domain
Superfamily Superfamily superfamily	a.236.1 — DNA primase DnaG, C-terminal domain
Family Family family	a.236.1.1 — DNA primase DnaG, C-terminal domain

CATH v4.4 (2 domains)

Domain ID domain_id	6cbrA00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	860 — DNAb Helicase; Chain A
Homologous superfamily homologous superfamily	10 — DNAb Helicase; Chain A

Domain ID domain_id	6cbrB00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	860 — DNAb Helicase; Chain A
Homologous superfamily homologous superfamily	10 — DNAb Helicase; Chain A

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Unit-cell length a length_a	31.723 Å
Unit-cell length b length_b	47.363 Å
Unit-cell length c length_c	51.881 Å
Unit-cell angle α angle_alpha	63.51 °
Unit-cell angle β angle_beta	76.97 °
Unit-cell angle γ angle_gamma	73.81 °
Molecules per unit cell Z z_pdb	2

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

Resolution resolution	1.500 Å
Low-resolution limit resolution_low	41.496 Å
R factor r_factor	0.1625
R_work r_work	0.1617
R_free r_free	0.1787

Description description	DNA primase,single-stranded DNA-binding protein chimera
Molecular weight formula_weight	18691.0 kDa
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	2572

DnaG Primase C-terminal domain complex with SSB C-terminal peptide

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

DNA primase,single-stranded DNA-binding protein chimera

State in the Current Structure

Other States of the Same Protein in the Database

DNA primase,single-stranded DNA-binding protein chimera

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

6cbr__assembly_1__model_1

6cbr__assembly_1__model_1 | I(q)

6cbr__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 (strain K12)
NCBI taxonomy ID ncbi_taxonomy_id	83333
Host organism host_organism	Escherichia coli BL21

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	309

DnaG Primase C-terminal domain complex with SSB C-terminal peptide

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

DNA primase,single-stranded DNA-binding protein chimera

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

DNA primase,single-stranded DNA-binding protein chimera

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

6cbr__assembly_1__model_1

6cbr__assembly_1__model_1 | I(q)

6cbr__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)