SAXSdb — 3am2

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

Heat-labile enterotoxin B chain

Clostridium perfringens

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 3	UNKNOWN ATOM OR ION × 9 GLYCEROL × 3 water × 3	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	ELTB_CLOPE
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–319； UniProt 1–319

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	3am2
Deposition date deposition_date	2010-08-12
Structure title title	Clostridium perfringens enterotoxin
Keywords keywords	PORE FORMING TOXINS, 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.

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3am2__assembly_1__model_1`	trimeric （3）	Excluded	—	—
	Exclusion reason： The source record does not identify the atom or ion element unambiguously, so a reliable calculation is not possible.

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4. Crystallography and Experiment 4. Crystallography & Experiment

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5. Entities and Polymers Entities & Polymers (4)

Entity 1 Entity 1 polymer

Description description	Heat-labile enterotoxin B chain
Molecular weight formula_weight	36566.5 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A
Atom count atom_count	2301

MLSNNLNPMVFENAKEVFLISEDLKTPINITNSNSNLSDGLYVIDKGDGWILGEPSVVSSQILNPNETGTFSQSLTKSKEVSINVNFSVGFTSEFIQASVEYGFGITIGEQNTIERSVSTTAGPNEYVYYKVYATYRKYQAIRISHGNISDDGSIYKLTGIWLSKTSADSLGNIDQGSLIETGERCVLTVPSTDIEKEILDLAAATERLNLTDALNSNPAGNLYDWRSSNSYPWTQKLNLHLTITATGQKYRILASKIVDFNIYSNNFNNLVKLEQSLGDGVKDHYVDISLDAGQYVLVMKANSSYSGNYPYSILFQKFLEHHHHHHH

Source Source

Source organism organism	Clostridium perfringens
NCBI taxonomy ID ncbi_taxonomy_id	1502
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 non-polymer

Description description	UNKNOWN ATOM OR ION
Source method src_method	syn
Copy count entity_count	3

Entity 3 Entity 3 non-polymer

Description description	GLYCEROL
Molecular weight formula_weight	92.1 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 4 Entity 4 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	56

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6. Fold Classification (SCOP + CATH) 5 domains

SCOP 2.08 (3 domains)

Domain ID domain_id	d3am2a1
Class class	b — All beta proteins
Fold Fold fold	b.18 — Galactose-binding domain-like
Superfamily Superfamily superfamily	b.18.1 — Galactose-binding domain-like
Family Family family	b.18.1.37 — Clostridium perfringens enterotoxin (CPE), C-terminal domain

Domain ID domain_id	d3am2a2
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.8 — Aerolisin/ETX pore-forming domain
Superfamily Superfamily superfamily	f.8.1 — Aerolisin/ETX pore-forming domain
Family Family family	f.8.1.3 — Clostridium perfringens enterotoxin (CPE), pore-forming domain

Domain ID domain_id	d3am2a3
Class class	l — Artifacts
Fold Fold fold	l.1 — Tags
Superfamily Superfamily superfamily	l.1.1 — Tags
Family Family family	l.1.1.1 — Tags

CATH v4.4 (2 domains)

Domain ID domain_id	3am2A01
Class class	2 — Mainly Beta
Architecture architecture	170 — Beta Complex
Topology topology	15 — Proaerolysin; Chain A, domain 3
Homologous superfamily homologous superfamily	20 —

Domain ID domain_id	3am2A02
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	120 — Jelly Rolls
Homologous superfamily homologous superfamily	1050 —

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Unit-cell length a length_a	101.030 Å
Unit-cell length b length_b	101.030 Å
Unit-cell length c length_c	101.030 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	12

Space group space_group	P 21 3
Space-group number int_tables_number	198
Crystal system crystal_system	—

Resolution resolution	2.510 Å
Low-resolution limit resolution_low	45.180 Å
R factor r_factor	0.2169
R_work r_work	0.2141
R_free r_free	0.2692

Clostridium perfringens enterotoxin

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

Heat-labile enterotoxin B chain

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

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

Diffraction experiment Diffraction

5. Entities and Polymers Entities & Polymers (4)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 water

6. Fold Classification (SCOP + CATH) 5 domains

SCOP 2.08 (3 domains)

CATH v4.4 (2 domains)

7. Citations (1)

Clostridium perfringens enterotoxin

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

Heat-labile enterotoxin B chain

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

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

Diffraction experiment Diffraction

5. Entities and Polymers Entities & Polymers (4)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 water

6. Fold Classification (SCOP + CATH) 5 domains

SCOP 2.08 (3 domains)

CATH v4.4 (2 domains)

7. Citations (1)