SAXSdb — 1fx3

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

PROTEIN-EXPORT PROTEIN SECB

Haemophilus influenzae

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 4	water × 4	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	SECB_HAEIN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–169； UniProt 1–169 Author chain B； PDBConstruct 1–169； UniProt 1–169 Author chain C； PDBConstruct 1–169； UniProt 1–169 Author chain D； PDBConstruct 1–169； UniProt 1–169

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	1fx3
Deposition date deposition_date	2000-09-25
Structure title title	CRYSTAL STRUCTURE OF H. INFLUENZAE SECB
Keywords keywords	protein trasnport, translocation, 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.

1fx3__assembly_1__model_1

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

Download this curve (.dat)

1fx3__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1fx3__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	26.65 Å
Rg (electron density)	25.17 Å
Total Rg	26.08 Å
Atom count	4422
Residues	569
Excluded volume	78769 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1fx3__assembly_1__model_1`	tetrameric （4）	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	d1fx3a_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.33 — SecB-like
Superfamily Superfamily superfamily	d.33.1 — SecB-like
Family Family family	d.33.1.1 — Bacterial protein-export protein SecB

Domain ID domain_id	d1fx3b_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.33 — SecB-like
Superfamily Superfamily superfamily	d.33.1 — SecB-like
Family Family family	d.33.1.1 — Bacterial protein-export protein SecB

Domain ID domain_id	d1fx3c_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.33 — SecB-like
Superfamily Superfamily superfamily	d.33.1 — SecB-like
Family Family family	d.33.1.1 — Bacterial protein-export protein SecB

Domain ID domain_id	d1fx3d_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.33 — SecB-like
Superfamily Superfamily superfamily	d.33.1 — SecB-like
Family Family family	d.33.1.1 — Bacterial protein-export protein SecB

CATH v4.4 (4 domains)

Domain ID domain_id	1fx3A00
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	420 — Bacterial Protein-export protein SecB
Homologous superfamily homologous superfamily	10 — SecB-like

Domain ID domain_id	1fx3B00
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	420 — Bacterial Protein-export protein SecB
Homologous superfamily homologous superfamily	10 — SecB-like

Domain ID domain_id	1fx3C00
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	420 — Bacterial Protein-export protein SecB
Homologous superfamily homologous superfamily	10 — SecB-like

Domain ID domain_id	1fx3D00
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	420 — Bacterial Protein-export protein SecB
Homologous superfamily homologous superfamily	10 — SecB-like

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Unit-cell length a length_a	126.344 Å
Unit-cell length b length_b	126.344 Å
Unit-cell length c length_c	148.333 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	32

Space group space_group	P 43 21 2
Space-group number int_tables_number	96
Crystal system crystal_system	—

Resolution resolution	2.500 Å
Low-resolution limit resolution_low	44.950 Å
R factor r_factor	0.2410
R_work r_work	0.2410
R_free r_free	0.3010

Description description	PROTEIN-EXPORT PROTEIN SECB
Molecular weight formula_weight	19146.3 kDa
Source method src_method	man
Copy count entity_count	4

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C,D
Atom count atom_count	4485

CRYSTAL STRUCTURE OF H. INFLUENZAE SECB

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

PROTEIN-EXPORT PROTEIN SECB

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

1fx3__assembly_1__model_1

1fx3__assembly_1__model_1 | I(q)

1fx3__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) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (1)

Source organism organism	Haemophilus influenzae
NCBI taxonomy ID ncbi_taxonomy_id	727
Host organism host_organism	Escherichia coli

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	63

CRYSTAL STRUCTURE OF H. INFLUENZAE SECB

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

PROTEIN-EXPORT PROTEIN SECB

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

1fx3__assembly_1__model_1

1fx3__assembly_1__model_1 | I(q)

1fx3__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) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (1)