SAXSdb — 1h3l

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

RNA POLYMERASE SIGMA FACTOR

STREPTOMYCES COELICOLOR A3(2)

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein monomer	Monomer	Protein 1	water × 1	Consistent with protein count
2	Protein monomer	Monomer	Protein 1	water × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	O87834_STRCO
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–87； UniProt 23–109 Author chain B； PDBConstruct 1–87； UniProt 23–109

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	1h3l
Deposition date deposition_date	2002-09-10
Structure title title	N-terminal fragment of SigR from Streptomyces coelicolor
Keywords keywords	TRANSCRIPTION, DNA-BINDING, TRANSCRIPTION REGULATION; 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.

1h3l__assembly_1__model_1

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

Download this curve (.dat)

1h3l__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1h3l__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	14.06 Å
Rg (electron density)	12.67 Å
Total Rg	13.93 Å
Atom count	611
Residues	75
Excluded volume	10709 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1h3l__assembly_1__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`1h3l__assembly_2__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 (2)

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6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d1h3la_
Class class	a — All alpha proteins
Fold Fold fold	a.177 — Sigma2 domain of RNA polymerase sigma factors
Superfamily Superfamily superfamily	a.177.1 — Sigma2 domain of RNA polymerase sigma factors
Family Family family	a.177.1.1 — Sigma2 domain of RNA polymerase sigma factors

Domain ID domain_id	d1h3lb_
Class class	a — All alpha proteins
Fold Fold fold	a.177 — Sigma2 domain of RNA polymerase sigma factors
Superfamily Superfamily superfamily	a.177.1 — Sigma2 domain of RNA polymerase sigma factors
Family Family family	a.177.1.1 — Sigma2 domain of RNA polymerase sigma factors

CATH v4.4 (2 domains)

Domain ID domain_id	1h3lA00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	1740 — Rna Polymerase Sigma Factor; Chain: A
Homologous superfamily homologous superfamily	10 — RNA polymerase sigma factor, region 2, helix turn helix motif

Domain ID domain_id	1h3lB00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	1740 — Rna Polymerase Sigma Factor; Chain: A
Homologous superfamily homologous superfamily	10 — RNA polymerase sigma factor, region 2, helix turn helix motif

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Unit-cell length a length_a	71.546 Å
Unit-cell length b length_b	71.546 Å
Unit-cell length c length_c	102.794 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.00 °
Unit-cell angle γ angle_gamma	120.00 °
Molecules per unit cell Z z_pdb	12

Space group space_group	P 32 2 1
Space-group number int_tables_number	154
Crystal system crystal_system	—

Resolution resolution	2.375 Å
Low-resolution limit resolution_low	40.000 Å
R factor r_factor	0.2594
R_work r_work	0.2584
R_free r_free	0.2782

Description description	RNA POLYMERASE SIGMA FACTOR
Molecular weight formula_weight	10157.3 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	1251

N-terminal fragment of SigR from Streptomyces coelicolor

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

RNA POLYMERASE SIGMA FACTOR

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

1h3l__assembly_1__model_1

1h3l__assembly_1__model_1 | I(q)

1h3l__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) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)

Source organism organism	STREPTOMYCES COELICOLOR A3(2)
NCBI taxonomy ID ncbi_taxonomy_id	100226
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	7

N-terminal fragment of SigR from Streptomyces coelicolor

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

RNA POLYMERASE SIGMA FACTOR

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

1h3l__assembly_1__model_1

1h3l__assembly_1__model_1 | I(q)

1h3l__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) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)