SAXSdb — 3egq

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

TetR family Transcriptional regulator

Archaeoglobus fulgidus

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 2	3,6,9,12,15,18,21-HEPTAOXATRICOSANE-1,23-DIOL × 2 water × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	O28458_ARCFU
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 2–170； UniProt 1–169 Author chain B； PDBConstruct 2–170； 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	3egq
Deposition date deposition_date	2008-09-11
Structure title title	Crystal structure of a tetr-family transcriptional regulator (af_1817) from archaeoglobus fulgidus at 2.55 A resolution
Keywords keywords	;Dna-binding, transcription regulation, bacterial regulatory proteins, dna/rna-binding 3-helical bundle fold, helix turn helix motif, hth motif, transcription regulator, structural genomics, Joint Center for Structural Genomics, JCSG, Protein Structure Initiative, PSI-2, 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.

3egq__assembly_1__model_1

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

Download this curve (.dat)

3egq__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

3egq__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	23.32 Å
Rg (electron density)	22.55 Å
Total Rg	22.98 Å
Atom count	2565
Residues	307
Excluded volume	46723 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3egq__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	TetR family Transcriptional regulator
Molecular weight formula_weight	20519.1 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	2582

GMTDQSVRIIEAALRLYMKKPPHEVSIEEIAREAKVSKSLIFYHFESKQKLLEEAVMHAFRKMMEEFNPRSVEEVVDYGIGFIAERREFIEFMMYALSQVRIEELERMFGEALEKVASLFEGCRHPRETAIALMAMLDGLSIYSLYFDLGKLEKYREIAMEFVESRRVRA

Source Source

Source organism organism	Archaeoglobus fulgidus
Common name common_name	Archaea
NCBI taxonomy ID ncbi_taxonomy_id	2234
Host organism host_organism	Escherichia Coli

Entity 2 Entity 2 non-polymer

Description description	3,6,9,12,15,18,21-HEPTAOXATRICOSANE-1,23-DIOL
Molecular weight formula_weight	370.4 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	9

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6. Fold Classification (SCOP + CATH) 2 domains

CATH v4.4 (2 domains)

Domain ID domain_id	3egqA00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	357 — Tetracycline Repressor; domain 2
Homologous superfamily homologous superfamily	10 — Tetracycline Repressor, domain 2

Domain ID domain_id	3egqB00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	357 — Tetracycline Repressor; domain 2
Homologous superfamily homologous superfamily	10 — Tetracycline Repressor, domain 2

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Unit-cell length a length_a	57.550 Å
Unit-cell length b length_b	61.040 Å
Unit-cell length c length_c	109.940 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 21 21 21
Space-group number int_tables_number	19
Crystal system crystal_system	—

Resolution resolution	2.550 Å
Low-resolution limit resolution_low	29.412 Å
R factor r_factor	0.2440
R_work r_work	0.2430
R_free r_free	0.2750

Crystal structure of a tetr-family transcriptional regulator (af_1817) from archaeoglobus fulgidus at 2.55 A resolution

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

TetR family Transcriptional regulator

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

3egq__assembly_1__model_1

3egq__assembly_1__model_1 | I(q)

3egq__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) 2 domains

CATH v4.4 (2 domains)

7. Citations (1)

Crystal structure of a tetr-family transcriptional regulator (af_1817) from archaeoglobus fulgidus at 2.55 A resolution

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

TetR family Transcriptional regulator

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

3egq__assembly_1__model_1

3egq__assembly_1__model_1 | I(q)

3egq__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) 2 domains

CATH v4.4 (2 domains)

7. Citations (1)