SAXSdb — 3g7z

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

Cytotoxic protein ccdB

Escherichia coli

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 4	Protein ccdA × 2 （P62552） water × 4	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	CCDB_ECOLI
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–101； UniProt 1–101 Author chain B； PDBConstruct 1–101； UniProt 1–101

Protein ccdA

OrganismNot specified

UniProt P62552

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 4	Cytotoxic protein ccdB × 2 （P62554） water × 4	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	CCDA_ECOLI
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain C； PDBConstruct 1–36； UniProt 37–72 Author chain D； PDBConstruct 1–36； UniProt 37–72

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	3g7z
Deposition date deposition_date	2009-02-11
Structure title title	CcdB dimer in complex with two C-terminal CcdA domains
Keywords keywords	ALPHA+BETA, SH3 domain, intrinsically disordered, TOXIN-TOXIN REPRESSOR COMPLEX; TOXIN/TOXIN 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.

3g7z__assembly_1__model_1

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

Download this curve (.dat)

3g7z__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

3g7z__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	18.71 Å
Rg (electron density)	17.51 Å
Total Rg	18.42 Å
Atom count	2006
Residues	258
Excluded volume	35800 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3g7z__assembly_1__model_1`	tetrameric （4）	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)

Entity 1 Entity 1 polymer

Description description	Cytotoxic protein ccdB
Molecular weight formula_weight	11721.5 kDa
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B
Atom count atom_count	2205

MQFKVYTYKRESRYRLFVDVQSDIIDTPGRRMVIPLASARLLSDKVSRELYPVVHIGDESWRMMTTDMASVPVSVIGEEVADLSHRENDIKNAINLMFWGI

Source Source

Source organism organism	Escherichia coli
NCBI taxonomy ID ncbi_taxonomy_id	562
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 polymer

Description description	Protein ccdA
Molecular weight formula_weight	4376.8 kDa
Source method src_method	syn
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	C,D

RRLRAERWKAENQEGMAEVARFIEMNGSFADENRDW

Entity 3 Entity 3 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	113

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6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d3g7za_
Class class	b — All beta proteins
Fold Fold fold	b.34 — SH3-like barrel
Superfamily Superfamily superfamily	b.34.6 — Cell growth inhibitor/plasmid maintenance toxic component
Family Family family	b.34.6.1 — CcdB

Domain ID domain_id	d3g7zb_
Class class	b — All beta proteins
Fold Fold fold	b.34 — SH3-like barrel
Superfamily Superfamily superfamily	b.34.6 — Cell growth inhibitor/plasmid maintenance toxic component
Family Family family	b.34.6.1 — CcdB

CATH v4.4 (2 domains)

Domain ID domain_id	3g7zA00
Class class	2 — Mainly Beta
Architecture architecture	30 — Roll
Topology topology	30 — SH3 type barrels.
Homologous superfamily homologous superfamily	110 —

Domain ID domain_id	3g7zB00
Class class	2 — Mainly Beta
Architecture architecture	30 — Roll
Topology topology	30 — SH3 type barrels.
Homologous superfamily homologous superfamily	110 —

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Unit-cell length a length_a	58.248 Å
Unit-cell length b length_b	38.377 Å
Unit-cell length c length_c	62.498 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	94.68 °
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	2.351 Å
Low-resolution limit resolution_low	32.674 Å
R factor r_factor	0.2060
R_work r_work	0.2030
R_free r_free	0.2720

CcdB dimer in complex with two C-terminal CcdA domains

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

Cytotoxic protein ccdB

State in the Current Structure

Other States of the Same Protein in the Database

Protein ccdA

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

3g7z__assembly_1__model_1

3g7z__assembly_1__model_1 | I(q)

3g7z__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

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)

CcdB dimer in complex with two C-terminal CcdA domains

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

Cytotoxic protein ccdB

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Protein ccdA

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

3g7z__assembly_1__model_1

3g7z__assembly_1__model_1 | I(q)

3g7z__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

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)