SAXSdb — 8qa8

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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	CYTIDINE-5'-TRIPHOSPHATE × 2 CHLORIDE ION × 8 water × 2	Consistent with protein count
2	Protein homooligomer	Homooligomer	Protein 2	CYTIDINE-5'-TRIPHOSPHATE × 2 CHLORIDE ION × 7 water × 2	Consistent with protein count
3	Protein homooligomer	Homooligomer	Protein 2	CYTIDINE-5'-TRIPHOSPHATE × 2 CHLORIDE ION × 7 water × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	KORB2_ECOLX
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 2–224； UniProt 31–253 Author chain B； PDBConstruct 2–224； UniProt 31–253 Author chain C； PDBConstruct 2–224； UniProt 31–253 Author chain D； PDBConstruct 2–224； UniProt 31–253 Author chain E； PDBConstruct 2–224； UniProt 31–253 Author chain F； PDBConstruct 2–224； UniProt 31–253

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	8qa8
Deposition date deposition_date	2023-08-22
Structure title title	Crystal structure of the C-terminally truncated transcriptional repressor protein KorB from the RK2 plasmid complexed with CTP-gamma-S
Keywords keywords	multi-drug resistance, ParABS, clamp, CTP switch, DNA segregation, gene expression regulation, DNA BINDING PROTEIN; DNA BINDING 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.

8qa8__assembly_1__model_1

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

Download this curve (.dat)

8qa8__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

8qa8__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	24.01 Å
Rg (electron density)	23.32 Å
Total Rg	24.09 Å
Atom count	3229
Residues	403
Excluded volume	56726 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`8qa8__assembly_1__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`8qa8__assembly_2__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
3	1	`8qa8__assembly_3__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 (4)

Entity 1 Entity 1 polymer

Description description	Transcriptional repressor protein KorB
Molecular weight formula_weight	26418.6 kDa
Source method src_method	man
Copy count entity_count	6

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C,D,E,F
Atom count atom_count	9992

MLDSIGDLSSLLDAPAASQGGSGPIELDLDLIDEDPHQPRTADNPGFSPESIAEIGATIKERGVKSPISVRENQEQPGRYIINHGARRYRGSKWAGKKSIPAFIDNDYNEADQVIENLQRNELTPREIADFIGRELAKGKKKGDIAKEIGKSPAFITQHVTLLDLPEKIADAFNTGRVRDVTVVNELVTAFKKRPEEVEAWLDDDTQEITRGTVKLLREFLDEKKLAAALEHHHHHH

Source Source

Source organism organism	Escherichia coli
NCBI taxonomy ID ncbi_taxonomy_id	562
Host organism host_organism	Escherichia coli BL21(DE3)

Entity 2 Entity 2 non-polymer

Description description	CYTIDINE-5'-TRIPHOSPHATE
Molecular weight formula_weight	483.2 kDa
Source method src_method	syn
Copy count entity_count	6

Entity 3 Entity 3 non-polymer

Description description	CHLORIDE ION
Molecular weight formula_weight	35.5 kDa
Source method src_method	nat
Copy count entity_count	22

Entity 4 Entity 4 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	204

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Unit-cell length a length_a	58.686 Å
Unit-cell length b length_b	152.710 Å
Unit-cell length c length_c	198.274 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	24

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

Resolution resolution	2.300 Å
Low-resolution limit resolution_low	121.280 Å
R factor r_factor	0.2288
R_work r_work	0.2274
R_free r_free	0.2562

Crystal structure of the C-terminally truncated transcriptional repressor protein KorB from the RK2 plasmid complexed with CTP-gamma-S

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

8qa8__assembly_1__model_1

8qa8__assembly_1__model_1 | I(q)

8qa8__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 (4)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 water

7. Citations (1)

Crystal structure of the C-terminally truncated transcriptional repressor protein KorB from the RK2 plasmid complexed with CTP-gamma-S

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

8qa8__assembly_1__model_1

8qa8__assembly_1__model_1 | I(q)

8qa8__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 (4)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 water

7. Citations (1)