SAXSdb — 3b8m

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

Ferric enterobactin (Enterochelin) transport

Escherichia coli

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 9	water × 9	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	Q8XBV8_ECO57
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 13–280； UniProt 64–331 Author chain B； PDBConstruct 13–280； UniProt 64–331 Author chain C； PDBConstruct 13–280； UniProt 64–331

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	3b8m
Deposition date deposition_date	2007-11-01
Structure title title	Structure of FepE- Bacterial Polysaccharide Co-polymerase
Keywords keywords	WZZ, FepE, Bacterial Polysaccharide Co-polymerase, METAL TRANSPORT, BIOSYNTHETIC PROTEIN; BIOSYNTHETIC PROTEIN
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.

3b8m__assembly_1__model_1

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

Download this curve (.dat)

3b8m__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

3b8m__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	48.52 Å
Rg (electron density)	47.71 Å
Total Rg	48.04 Å
Atom count	18393
Residues	2295
Excluded volume	329530 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3b8m__assembly_1__model_1`	nonameric （9）	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) 9 domains

SCOP 2.08 (3 domains)

Domain ID domain_id	d3b8ma1
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.58 — Ferredoxin-like
Superfamily Superfamily superfamily	d.58.60 — Bacterial polysaccharide co-polymerase-like
Family Family family	d.58.60.1 — FepE-like

Domain ID domain_id	d3b8mb_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.58 — Ferredoxin-like
Superfamily Superfamily superfamily	d.58.60 — Bacterial polysaccharide co-polymerase-like
Family Family family	d.58.60.1 — FepE-like

Domain ID domain_id	d3b8mc_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.58 — Ferredoxin-like
Superfamily Superfamily superfamily	d.58.60 — Bacterial polysaccharide co-polymerase-like
Family Family family	d.58.60.1 — FepE-like

CATH v4.4 (6 domains)

Domain ID domain_id	3b8mA01
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	1890 — Bacterial polysaccharide co-polymerase-like
Homologous superfamily homologous superfamily	10 — FepE-like

Domain ID domain_id	3b8mA02
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	287 — Helix Hairpins
Homologous superfamily homologous superfamily	210 —

Domain ID domain_id	3b8mB01
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	1890 — Bacterial polysaccharide co-polymerase-like
Homologous superfamily homologous superfamily	10 — FepE-like

Domain ID domain_id	3b8mB02
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	287 — Helix Hairpins
Homologous superfamily homologous superfamily	210 —

Domain ID domain_id	3b8mC01
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	1890 — Bacterial polysaccharide co-polymerase-like
Homologous superfamily homologous superfamily	10 — FepE-like

Domain ID domain_id	3b8mC02
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	287 — Helix Hairpins
Homologous superfamily homologous superfamily	210 —

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Unit-cell length a length_a	139.726 Å
Unit-cell length b length_b	139.726 Å
Unit-cell length c length_c	276.654 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.00 °
Unit-cell angle γ angle_gamma	120.00 °
Molecules per unit cell Z z_pdb	36

Space group space_group	P 63 2 2
Space-group number int_tables_number	182
Crystal system crystal_system	—

Resolution resolution	2.700 Å
Low-resolution limit resolution_low	46.130 Å
R factor r_factor	0.2280
R_work r_work	0.2258
R_free r_free	0.2695

Description description	Ferric enterobactin (Enterochelin) transport
Molecular weight formula_weight	31865.1 kDa
Source method src_method	man
Copy count entity_count	3

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C
Atom count atom_count	6159

Structure of FepE- Bacterial Polysaccharide Co-polymerase

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

Ferric enterobactin (Enterochelin) transport

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

3b8m__assembly_1__model_1

3b8m__assembly_1__model_1 | I(q)

3b8m__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) 9 domains

SCOP 2.08 (3 domains)

CATH v4.4 (6 domains)

7. Citations (1)

Source organism organism	Escherichia coli
NCBI taxonomy ID ncbi_taxonomy_id	562
Host organism host_organism	Escherichia coli BL21(DE3)

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	28

Structure of FepE- Bacterial Polysaccharide Co-polymerase

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

Ferric enterobactin (Enterochelin) transport

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

3b8m__assembly_1__model_1

3b8m__assembly_1__model_1 | I(q)

3b8m__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) 9 domains

SCOP 2.08 (3 domains)

CATH v4.4 (6 domains)

7. Citations (1)