SAXSdb — 2qfi

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

Ferrous-iron efflux pump fieF

Escherichia coli

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 2	ZINC ION × 8	Consistent with protein count
2	Protein homooligomer	Homooligomer	Protein 2	ZINC ION × 6	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	FIEF_ECOLI
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–300； UniProt 1–300 Author chain B； PDBConstruct 1–300； UniProt 1–300

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	2qfi
Deposition date deposition_date	2007-06-27
Structure title title	Structure of the zinc transporter YiiP
Keywords keywords	zinc transporter, TRANSPORT PROTEIN; TRANSPORT 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.

2qfi__assembly_1__model_1

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

Download this curve (.dat)

2qfi__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

2qfi__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	29.14 Å
Rg (electron density)	29.28 Å
Total Rg	29.86 Å
Atom count	4418
Residues	572
Excluded volume	79681 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`2qfi__assembly_1__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`2qfi__assembly_2__model_1`	dimeric （2）	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) 8 domains

SCOP 2.08 (4 domains)

Domain ID domain_id	d2qfia1
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.52 — Alpha-lytic protease prodomain-like
Superfamily Superfamily superfamily	d.52.9 — Cation efflux protein cytoplasmic domain-like
Family Family family	d.52.9.1 — Cation efflux protein cytoplasmic domain-like

Domain ID domain_id	d2qfia2
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.59 — Cation efflux protein transmembrane domain-like
Superfamily Superfamily superfamily	f.59.1 — Cation efflux protein transmembrane domain-like
Family Family family	f.59.1.1 — Cation efflux protein transmembrane domain-like

Domain ID domain_id	d2qfib1
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.52 — Alpha-lytic protease prodomain-like
Superfamily Superfamily superfamily	d.52.9 — Cation efflux protein cytoplasmic domain-like
Family Family family	d.52.9.1 — Cation efflux protein cytoplasmic domain-like

Domain ID domain_id	d2qfib2
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.59 — Cation efflux protein transmembrane domain-like
Superfamily Superfamily superfamily	f.59.1 — Cation efflux protein transmembrane domain-like
Family Family family	f.59.1.1 — Cation efflux protein transmembrane domain-like

CATH v4.4 (4 domains)

Domain ID domain_id	2qfiA01
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	1510 — Alpha-lytic protease prodomain-like
Homologous superfamily homologous superfamily	10 — Cation efflux protein transmembrane domain

Domain ID domain_id	2qfiA02
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily	1350 — Cation efflux protein, cytoplasmic domain

Domain ID domain_id	2qfiB01
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	1510 — Alpha-lytic protease prodomain-like
Homologous superfamily homologous superfamily	10 — Cation efflux protein transmembrane domain

Domain ID domain_id	2qfiB02
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily	1350 — Cation efflux protein, cytoplasmic domain

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Unit-cell length a length_a	106.660 Å
Unit-cell length b length_b	110.839 Å
Unit-cell length c length_c	130.662 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	8

Space group space_group	P 2 2 21
Space-group number int_tables_number	17
Crystal system crystal_system	—

Resolution resolution	3.800 Å
Low-resolution limit resolution_low	12.000 Å
R factor r_factor	0.3226
R_work r_work	0.3222
R_free r_free	0.3293

Description description	Ferrous-iron efflux pump fieF
Molecular weight formula_weight	32957.2 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	4417

Structure of the zinc transporter YiiP

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

Ferrous-iron efflux pump fieF

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

2qfi__assembly_1__model_1

2qfi__assembly_1__model_1 | I(q)

2qfi__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 non-polymer

6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (1)

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

Description description	ZINC ION
Molecular weight formula_weight	65.4 kDa
Source method src_method	syn
Copy count entity_count	7

Structure of the zinc transporter YiiP

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

Ferrous-iron efflux pump fieF

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

2qfi__assembly_1__model_1

2qfi__assembly_1__model_1 | I(q)

2qfi__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 non-polymer

6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (1)