SAXSdb — 2qj6

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

Toxin A

Clostridium difficile

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein monomer	Monomer	Protein 1	water × 1	Consistent with protein count
2	Protein monomer	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	TOXA_CLODI
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 13–332； UniProt 2387–2706 Author chain B； PDBConstruct 13–332； UniProt 2387–2706

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	2qj6
Deposition date deposition_date	2007-07-06
Structure title title	Crystal structure analysis of a 14 repeat C-terminal fragment of toxin TcdA in Clostridium difficile
Keywords keywords	Clostridial Repetitive Oligo Peptides, TOXIN; TOXIN
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.

2qj6__assembly_1__model_1

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

Download this curve (.dat)

2qj6__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

2qj6__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	33.11 Å
Rg (electron density)	33.66 Å
Total Rg	33.96 Å
Atom count	2522
Residues	317
Excluded volume	44554 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`2qj6__assembly_1__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`2qj6__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) 6 domains

CATH v4.4 (6 domains)

Domain ID domain_id	2qj6A01
Class class	2 — Mainly Beta
Architecture architecture	10 — Ribbon
Topology topology	270 — left handed beta-beta-3-solenoid
Homologous superfamily homologous superfamily	10 — Cholin Binding

Domain ID domain_id	2qj6A02
Class class	2 — Mainly Beta
Architecture architecture	10 — Ribbon
Topology topology	270 — left handed beta-beta-3-solenoid
Homologous superfamily homologous superfamily	10 — Cholin Binding

Domain ID domain_id	2qj6A03
Class class	2 — Mainly Beta
Architecture architecture	10 — Ribbon
Topology topology	270 — left handed beta-beta-3-solenoid
Homologous superfamily homologous superfamily	10 — Cholin Binding

Domain ID domain_id	2qj6B01
Class class	2 — Mainly Beta
Architecture architecture	10 — Ribbon
Topology topology	270 — left handed beta-beta-3-solenoid
Homologous superfamily homologous superfamily	10 — Cholin Binding

Domain ID domain_id	2qj6B02
Class class	2 — Mainly Beta
Architecture architecture	10 — Ribbon
Topology topology	270 — left handed beta-beta-3-solenoid
Homologous superfamily homologous superfamily	10 — Cholin Binding

Domain ID domain_id	2qj6B03
Class class	2 — Mainly Beta
Architecture architecture	10 — Ribbon
Topology topology	270 — left handed beta-beta-3-solenoid
Homologous superfamily homologous superfamily	10 — Cholin Binding

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Unit-cell length a length_a	40.050 Å
Unit-cell length b length_b	199.680 Å
Unit-cell length c length_c	58.720 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.01 °
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	2.500 Å
Low-resolution limit resolution_low	56.335 Å
R factor r_factor	0.2277
R_work r_work	0.2256
R_free r_free	0.2734

Description description	Toxin A
Molecular weight formula_weight	37240.2 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	5227

Crystal structure analysis of a 14 repeat C-terminal fragment of toxin TcdA in Clostridium difficile

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

Toxin A

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

2qj6__assembly_1__model_1

2qj6__assembly_1__model_1 | I(q)

2qj6__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) 6 domains

CATH v4.4 (6 domains)

7. Citations (1)

Source organism organism	Clostridium difficile
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	183

Crystal structure analysis of a 14 repeat C-terminal fragment of toxin TcdA in Clostridium difficile

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

Toxin A

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

2qj6__assembly_1__model_1

2qj6__assembly_1__model_1 | I(q)

2qj6__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) 6 domains

CATH v4.4 (6 domains)

7. Citations (1)