SAXSdb — 1igq

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

Transcriptional repressor protein KorB

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	water × 2	Consistent with protein count
2	Protein homooligomer	Homooligomer	Protein 2	water × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	KORB2_ECOLI
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–62； UniProt 297–358 Author chain B； PDBConstruct 1–62； UniProt 297–358 Author chain C； PDBConstruct 1–62； UniProt 297–358 Author chain D； PDBConstruct 1–62； UniProt 297–358

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	1igq
Deposition date deposition_date	2001-04-18
Structure title title	C-terminal Domain of Transcriptional Repressor Protein KorB
Keywords keywords	SH3 domain, dimerization domain, 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.

1igq__assembly_2__model_1

Assembly 2 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

1igq__assembly_2__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1igq__assembly_2__model_1 | P(r) · Pending

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

Rg（Guinier）	15.34 Å
Rg (electron density)	13.74 Å
Total Rg	14.88 Å
Atom count	916
Residues	116
Excluded volume	16247 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1igq__assembly_1__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`1igq__assembly_2__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 (2)

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6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

Domain ID domain_id	d1igqa_
Class class	b — All beta proteins
Fold Fold fold	b.34 — SH3-like barrel
Superfamily Superfamily superfamily	b.34.1 — C-terminal domain of transcriptional repressors
Family Family family	b.34.1.3 — Transcriptional repressor protein KorB

Domain ID domain_id	d1igqb_
Class class	b — All beta proteins
Fold Fold fold	b.34 — SH3-like barrel
Superfamily Superfamily superfamily	b.34.1 — C-terminal domain of transcriptional repressors
Family Family family	b.34.1.3 — Transcriptional repressor protein KorB

Domain ID domain_id	d1igqc_
Class class	b — All beta proteins
Fold Fold fold	b.34 — SH3-like barrel
Superfamily Superfamily superfamily	b.34.1 — C-terminal domain of transcriptional repressors
Family Family family	b.34.1.3 — Transcriptional repressor protein KorB

Domain ID domain_id	d1igqd_
Class class	b — All beta proteins
Fold Fold fold	b.34 — SH3-like barrel
Superfamily Superfamily superfamily	b.34.1 — C-terminal domain of transcriptional repressors
Family Family family	b.34.1.3 — Transcriptional repressor protein KorB

CATH v4.4 (4 domains)

Domain ID domain_id	1igqA00
Class class	2 — Mainly Beta
Architecture architecture	30 — Roll
Topology topology	30 — SH3 type barrels.
Homologous superfamily homologous superfamily	150 — KorB, C-terminal domain

Domain ID domain_id	1igqB00
Class class	2 — Mainly Beta
Architecture architecture	30 — Roll
Topology topology	30 — SH3 type barrels.
Homologous superfamily homologous superfamily	150 — KorB, C-terminal domain

Domain ID domain_id	1igqC00
Class class	2 — Mainly Beta
Architecture architecture	30 — Roll
Topology topology	30 — SH3 type barrels.
Homologous superfamily homologous superfamily	150 — KorB, C-terminal domain

Domain ID domain_id	1igqD00
Class class	2 — Mainly Beta
Architecture architecture	30 — Roll
Topology topology	30 — SH3 type barrels.
Homologous superfamily homologous superfamily	150 — KorB, C-terminal domain

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Unit-cell length a length_a	42.130 Å
Unit-cell length b length_b	82.150 Å
Unit-cell length c length_c	87.860 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	16

Space group space_group	P 21 21 21
Space-group number int_tables_number	19
Crystal system crystal_system	—

Resolution resolution	1.700 Å
Low-resolution limit resolution_low	22.000 Å
R factor r_factor	0.1946
R_work r_work	0.1928
R_free r_free	0.2280

Description description	Transcriptional repressor protein KorB
Molecular weight formula_weight	7110.0 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	2083

C-terminal Domain of Transcriptional Repressor Protein KorB

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

Transcriptional repressor protein KorB

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

1igq__assembly_2__model_1

1igq__assembly_2__model_1 | I(q)

1igq__assembly_2__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	Escherichia coli
NCBI taxonomy ID ncbi_taxonomy_id	562
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	250

C-terminal Domain of Transcriptional Repressor Protein KorB

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

Transcriptional repressor protein KorB

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

1igq__assembly_2__model_1

1igq__assembly_2__model_1 | I(q)

1igq__assembly_2__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)