SAXSdb — 6fal

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

Trp operon repressor

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	INDOLYLPROPIONIC ACID × 2 water × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	TRPR_ECOLI
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–107； UniProt 2–108 Author chain B； PDBConstruct 1–107； UniProt 2–108

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	6fal
Deposition date deposition_date	2017-12-15
Structure title title	Tryptophan Repressor TrpR from E.coli with 3-Indolepropionic acid as ligand
Keywords keywords	Ligand Binding, TRANSCRIPTION; TRANSCRIPTION
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.

6fal__assembly_1__model_1

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

Download this curve (.dat)

6fal__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

6fal__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	19.21 Å
Rg (electron density)	17.88 Å
Total Rg	18.98 Å
Atom count	3255
Residues	194
Excluded volume	28848 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`6fal__assembly_1__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 (3)

Entity 1 Entity 1 polymer

Description description	Trp operon repressor
Molecular weight formula_weight	13386.2 kDa
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B
Atom count atom_count	3550

AQQSPYSAAMAEQRHQEWLRFVDLLKNAYQNDLHLPLLNLMLTPDEREALGTRVRIVEELLRGEMSQRELKNELGAGIATITRGSNYLKAAPVELRQWLEEVLLKSDLEHHHHHH

Source Source

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

Entity 2 Entity 2 non-polymer

Description description	INDOLYLPROPIONIC ACID
Molecular weight formula_weight	189.2 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 3 Entity 3 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	224

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6. Fold Classification (SCOP + CATH) 5 domains

SCOP 2.08 (3 domains)

Domain ID domain_id	d6fala_
Class class	a — All alpha proteins
Fold Fold fold	a.4 — DNA/RNA-binding 3-helical bundle
Superfamily Superfamily superfamily	a.4.12 — TrpR-like
Family Family family	a.4.12.1 — Trp repressor, TrpR

Domain ID domain_id	d6falb1
Class class	a — All alpha proteins
Fold Fold fold	a.4 — DNA/RNA-binding 3-helical bundle
Superfamily Superfamily superfamily	a.4.12 — TrpR-like
Family Family family	a.4.12.1 — Trp repressor, TrpR

Domain ID domain_id	d6falb2
Class class	l — Artifacts
Fold Fold fold	l.1 — Tags
Superfamily Superfamily superfamily	l.1.1 — Tags
Family Family family	l.1.1.1 — Tags

CATH v4.4 (2 domains)

Domain ID domain_id	6falA00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	1270 — Trp Operon Repressor; Chain A
Homologous superfamily homologous superfamily	10 — TrpR-like

Domain ID domain_id	6falB00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	1270 — Trp Operon Repressor; Chain A
Homologous superfamily homologous superfamily	10 — TrpR-like

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Unit-cell length a length_a	36.070 Å
Unit-cell length b length_b	45.250 Å
Unit-cell length c length_c	60.670 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	104.02 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	4

Space group space_group	P 1 21 1
Space-group number int_tables_number	4
Crystal system crystal_system	—

Resolution resolution	1.200 Å
Low-resolution limit resolution_low	35.875 Å
R factor r_factor	0.1627
R_work r_work	0.1618
R_free r_free	0.1790

Tryptophan Repressor TrpR from E.coli with 3-Indolepropionic acid as ligand

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

Trp operon repressor

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

6fal__assembly_1__model_1

6fal__assembly_1__model_1 | I(q)

6fal__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

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 5 domains

SCOP 2.08 (3 domains)

CATH v4.4 (2 domains)

7. Citations (1)

Tryptophan Repressor TrpR from E.coli with 3-Indolepropionic acid as ligand

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

Trp operon repressor

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

6fal__assembly_1__model_1

6fal__assembly_1__model_1 | I(q)

6fal__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

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 5 domains

SCOP 2.08 (3 domains)

CATH v4.4 (2 domains)

7. Citations (1)