3b8n

Structure of FepE- Bacterial Polysaccharide Co-polymerase

Method: X-RAY DIFFRACTION

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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	No other associated polymer	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 13–279； UniProt 65–331 Author chain B； PDBConstruct 13–279； UniProt 65–331 Author chain C； PDBConstruct 13–279； UniProt 65–331 Author chain D； PDBConstruct 13–279； UniProt 65–331 Author chain E； PDBConstruct 13–279； UniProt 65–331 Author chain F； PDBConstruct 13–279； UniProt 65–331 Author chain G； PDBConstruct 13–279； UniProt 65–331 Author chain H； PDBConstruct 13–279； UniProt 65–331 Author chain I； PDBConstruct 13–279； UniProt 65–331

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	3b8n
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.

3b8n__assembly_1__model_1

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

Download this curve (.dat)

3b8n__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

3b8n__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	48.61 Å
Rg (electron density)	47.70 Å
Total Rg	48.04 Å
Atom count	17478
Residues	2169
Excluded volume	313880 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3b8n__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 (1)

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6. Fold Classification (SCOP + CATH) 27 domains

SCOP 2.08 (9 domains)

Domain ID domain_id	d3b8na1
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	d3b8nb_
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	d3b8nc_
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	d3b8nd_
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	d3b8ne_
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	d3b8nf_
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	d3b8ng_
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	d3b8nh_
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	d3b8ni_
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 (18 domains)

Domain ID domain_id	3b8nA01
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	3b8nA02
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	287 — Helix Hairpins
Homologous superfamily homologous superfamily	210 —

Domain ID domain_id	3b8nB01
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	3b8nB02
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	287 — Helix Hairpins
Homologous superfamily homologous superfamily	210 —

Domain ID domain_id	3b8nC01
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	3b8nC02
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	287 — Helix Hairpins
Homologous superfamily homologous superfamily	210 —

Domain ID domain_id	3b8nD01
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	3b8nD02
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	287 — Helix Hairpins
Homologous superfamily homologous superfamily	210 —

Domain ID domain_id	3b8nE01
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	3b8nE02
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	287 — Helix Hairpins
Homologous superfamily homologous superfamily	210 —

Domain ID domain_id	3b8nF01
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	3b8nF02
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	287 — Helix Hairpins
Homologous superfamily homologous superfamily	210 —

Domain ID domain_id	3b8nG01
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	3b8nG02
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	287 — Helix Hairpins
Homologous superfamily homologous superfamily	210 —

Domain ID domain_id	3b8nH01
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	3b8nH02
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	287 — Helix Hairpins
Homologous superfamily homologous superfamily	210 —

Domain ID domain_id	3b8nI01
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	3b8nI02
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	160.670 Å
Unit-cell length b length_b	160.670 Å
Unit-cell length c length_c	276.938 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	54

Space group space_group	P 32 2 1
Space-group number int_tables_number	154
Crystal system crystal_system	—

Resolution resolution	3.100 Å
Low-resolution limit resolution_low	20.000 Å
R factor r_factor	—
R_work r_work	0.2540
R_free r_free	0.2820

Description description	Ferric enterobactin (Enterochelin) transport
Molecular weight formula_weight	31735.9 kDa
Source method src_method	man
Copy count entity_count	9

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C,D,E,F,G,H,I
Atom count atom_count	17478

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

3b8n__assembly_1__model_1

3b8n__assembly_1__model_1 | I(q)

3b8n__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 (1)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

6. Fold Classification (SCOP + CATH) 27 domains

SCOP 2.08 (9 domains)

CATH v4.4 (18 domains)

7. Citations (1)

Source organism organism	Escherichia coli
NCBI taxonomy ID ncbi_taxonomy_id	83334
Host organism host_organism	Escherichia coli BL21(DE3)

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

3b8n__assembly_1__model_1

3b8n__assembly_1__model_1 | I(q)

3b8n__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 (1)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

6. Fold Classification (SCOP + CATH) 27 domains

SCOP 2.08 (9 domains)

CATH v4.4 (18 domains)

7. Citations (1)