SAXSdb — 1by3

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

PROTEIN (FERRICHROME-IRON RECEPTOR PRECURSOR (FHUA))

OrganismNot specified

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein monomer	Monomer	Protein 1	N-OCTYL-2-HYDROXYETHYL SULFOXIDE × 7 water × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	FHUA_ECOLI
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–714； UniProt 34–747

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	1by3
Deposition date deposition_date	1998-10-22
Structure title title	FHUA FROM E. COLI
Keywords keywords	FHUA, MEMBRANE PROTEIN, LIGAND-GATED, IRON TRANSPORT; MEMBRANE 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.

1by3__assembly_1__model_1

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

Download this curve (.dat)

1by3__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1by3__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	26.40 Å
Rg (electron density)	25.71 Å
Total Rg	26.52 Å
Atom count	5526
Residues	695
Excluded volume	97577 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1by3__assembly_1__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 (3)

Entity 1 Entity 1 polymer

Description description	PROTEIN (FERRICHROME-IRON RECEPTOR PRECURSOR (FHUA))
Molecular weight formula_weight	78929.0 kDa
Source method src_method	nat
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A
Atom count atom_count	5677

AVEPKEDTITVTAAPAPQESAWGPAATIAARQSATGTKTDTPIQKVPQSISVVTAEEMALHQPKSVKEALSYTPGVSVGTRGASNTYDHLIIRGFAAEGQSQNNYLNGLKLQGNFYNDAVIDPYMLERAEIMRGPVSVLYGKSSPGGLLNMVSKRPTTEPLKEVQFKAGTDSLFQTGFDFSDSLDDDGVYSYRLTGLARSANAQQKGSEEQRYAIAPAFTWRPDDKTNFTFLSYFQNEPETGYYGWLPKEGTVEPLPNGKRLPTDFNEGAKNNTYSRNEKMVGYSFDHEFNDTFTVRQNLRFAENKTSQNSVYGYGVCSDPANAYSKQCAALAPADKGHYLARKYVVDDEKLQNFSVDTQLQSKFATGDIDHTLLTGVDFMRMRNDINAWFGYDDSVPLLNLYNPVNTDFDFNAKDPANSGPYRILNKQKQTGVYVQDQAQWDKVLVTLGGRYDWADQESLNRVAGTTDKRDDKQFTWRGGVNYLFDNGVTPYFSYSESFEPSSQVGKDGNIFAPSKGKQYEVGVKYVPEDRPIVVTGAVYNLTKTNNLMADPEGSFFSVEGGEIRARGVEIEAKRPLSASVNVVGSYTYTDAEYTTDTTYKGNTPAQVPKHMASLWADYTFFDGPLSGLTLGTGGRYTGSSYGDPANSFKVGSYTVVDALVRYDLARVGMAGSNVALHVNNLFDREYVASCFNTYGCFWGAERQVVATATFRF

Entity 2 Entity 2 non-polymer

Description description	N-OCTYL-2-HYDROXYETHYL SULFOXIDE
Molecular weight formula_weight	206.3 kDa
Source method src_method	syn
Copy count entity_count	7

Entity 3 Entity 3 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	151

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6. Fold Classification (SCOP + CATH) 3 domains

SCOP 2.08 (1 domains)

Domain ID domain_id	d1by3a_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.4 — Transmembrane beta-barrels
Superfamily Superfamily superfamily	f.4.3 — Porins
Family Family family	f.4.3.3 — Ligand-gated protein channel

CATH v4.4 (2 domains)

Domain ID domain_id	1by3A01
Class class	2 — Mainly Beta
Architecture architecture	170 — Beta Complex
Topology topology	130 — Ferric Hydroxamate Uptake Protein; Chain A, domain 1
Homologous superfamily homologous superfamily	10 — TonB-dependent receptor, plug domain

Domain ID domain_id	1by3A02
Class class	2 — Mainly Beta
Architecture architecture	40 — Beta Barrel
Topology topology	170 — Maltoporin; Chain A
Homologous superfamily homologous superfamily	20 — TonB-dependent receptor, beta-barrel domain

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Unit-cell length a length_a	132.900 Å
Unit-cell length b length_b	89.900 Å
Unit-cell length c length_c	90.000 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	95.20 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	4

Space group space_group	C 1 2 1
Space-group number int_tables_number	5
Crystal system crystal_system	—

Resolution resolution	2.740 Å
Low-resolution limit resolution_low	12.000 Å
R factor r_factor	0.1860
R_work r_work	0.1860
R_free r_free	0.2440

FHUA FROM E. COLI

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

PROTEIN (FERRICHROME-IRON RECEPTOR PRECURSOR (FHUA))

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

1by3__assembly_1__model_1

1by3__assembly_1__model_1 | I(q)

1by3__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 (3)

Entity 1 Entity 1 polymer

Polymer Polymer

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 3 domains

SCOP 2.08 (1 domains)

CATH v4.4 (2 domains)

7. Citations (2)

FHUA FROM E. COLI

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

PROTEIN (FERRICHROME-IRON RECEPTOR PRECURSOR (FHUA))

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

1by3__assembly_1__model_1

1by3__assembly_1__model_1 | I(q)

1by3__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 (3)

Entity 1 Entity 1 polymer

Polymer Polymer

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 3 domains

SCOP 2.08 (1 domains)

CATH v4.4 (2 domains)

7. Citations (2)