2fkd

Crystal Structure of the C-terminal domain of Bacteriophage 186 repressor

Method: X-RAY DIFFRACTION

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

Repressor protein CI

Enterobacteria phage 186

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 14	No other associated polymer	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	RPC1_BP186
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–110； UniProt 83–192 Author chain B； PDBConstruct 1–110； UniProt 83–192 Author chain C； PDBConstruct 1–110； UniProt 83–192 Author chain D； PDBConstruct 1–110； UniProt 83–192 Author chain E； PDBConstruct 1–110； UniProt 83–192 Author chain F； PDBConstruct 1–110； UniProt 83–192 Author chain G； PDBConstruct 1–110； UniProt 83–192 Author chain H； PDBConstruct 1–110； UniProt 83–192 Author chain I； PDBConstruct 1–110； UniProt 83–192 Author chain J； PDBConstruct 1–110； UniProt 83–192 Author chain K； PDBConstruct 1–110； UniProt 83–192 Author chain L； PDBConstruct 1–110； UniProt 83–192 Author chain M； PDBConstruct 1–110； UniProt 83–192 Author chain N； PDBConstruct 1–110； UniProt 83–192

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	2fkd
Deposition date deposition_date	2006-01-04
Structure title title	Crystal Structure of the C-terminal domain of Bacteriophage 186 repressor
Keywords keywords	genetic switch, regulation, cooperativity, repressor, Transcription regulator; Transcription regulator
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.

2fkd__assembly_1__model_1

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

Download this curve (.dat)

2fkd__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

2fkd__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	39.88 Å
Rg (electron density)	38.81 Å
Total Rg	39.43 Å
Atom count	11886
Residues	1540
Excluded volume	213740 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`2fkd__assembly_1__model_1`	tetradecameric （14）	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 (1)

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6. Fold Classification (SCOP + CATH) 14 domains

CATH v4.4 (14 domains)

Domain ID domain_id	2fkdA00
Class class	2 — Mainly Beta
Architecture architecture	10 — Ribbon
Topology topology	109 — Umud Fragment, subunit A
Homologous superfamily homologous superfamily	10 — Umud Fragment, subunit A

Domain ID domain_id	2fkdB00
Class class	2 — Mainly Beta
Architecture architecture	10 — Ribbon
Topology topology	109 — Umud Fragment, subunit A
Homologous superfamily homologous superfamily	10 — Umud Fragment, subunit A

Domain ID domain_id	2fkdC00
Class class	2 — Mainly Beta
Architecture architecture	10 — Ribbon
Topology topology	109 — Umud Fragment, subunit A
Homologous superfamily homologous superfamily	10 — Umud Fragment, subunit A

Domain ID domain_id	2fkdD00
Class class	2 — Mainly Beta
Architecture architecture	10 — Ribbon
Topology topology	109 — Umud Fragment, subunit A
Homologous superfamily homologous superfamily	10 — Umud Fragment, subunit A

Domain ID domain_id	2fkdE00
Class class	2 — Mainly Beta
Architecture architecture	10 — Ribbon
Topology topology	109 — Umud Fragment, subunit A
Homologous superfamily homologous superfamily	10 — Umud Fragment, subunit A

Domain ID domain_id	2fkdF00
Class class	2 — Mainly Beta
Architecture architecture	10 — Ribbon
Topology topology	109 — Umud Fragment, subunit A
Homologous superfamily homologous superfamily	10 — Umud Fragment, subunit A

Domain ID domain_id	2fkdG00
Class class	2 — Mainly Beta
Architecture architecture	10 — Ribbon
Topology topology	109 — Umud Fragment, subunit A
Homologous superfamily homologous superfamily	10 — Umud Fragment, subunit A

Domain ID domain_id	2fkdH00
Class class	2 — Mainly Beta
Architecture architecture	10 — Ribbon
Topology topology	109 — Umud Fragment, subunit A
Homologous superfamily homologous superfamily	10 — Umud Fragment, subunit A

Domain ID domain_id	2fkdI00
Class class	2 — Mainly Beta
Architecture architecture	10 — Ribbon
Topology topology	109 — Umud Fragment, subunit A
Homologous superfamily homologous superfamily	10 — Umud Fragment, subunit A

Domain ID domain_id	2fkdJ00
Class class	2 — Mainly Beta
Architecture architecture	10 — Ribbon
Topology topology	109 — Umud Fragment, subunit A
Homologous superfamily homologous superfamily	10 — Umud Fragment, subunit A

Domain ID domain_id	2fkdK00
Class class	2 — Mainly Beta
Architecture architecture	10 — Ribbon
Topology topology	109 — Umud Fragment, subunit A
Homologous superfamily homologous superfamily	10 — Umud Fragment, subunit A

Domain ID domain_id	2fkdL00
Class class	2 — Mainly Beta
Architecture architecture	10 — Ribbon
Topology topology	109 — Umud Fragment, subunit A
Homologous superfamily homologous superfamily	10 — Umud Fragment, subunit A

Domain ID domain_id	2fkdM00
Class class	2 — Mainly Beta
Architecture architecture	10 — Ribbon
Topology topology	109 — Umud Fragment, subunit A
Homologous superfamily homologous superfamily	10 — Umud Fragment, subunit A

Domain ID domain_id	2fkdN00
Class class	2 — Mainly Beta
Architecture architecture	10 — Ribbon
Topology topology	109 — Umud Fragment, subunit A
Homologous superfamily homologous superfamily	10 — Umud Fragment, subunit A

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Unit-cell length a length_a	65.606 Å
Unit-cell length b length_b	167.089 Å
Unit-cell length c length_c	177.068 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	56

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

Resolution resolution	2.700 Å
Low-resolution limit resolution_low	20.000 Å
R factor r_factor	0.2410
R_work r_work	0.2400
R_free r_free	0.2970

Description description	Repressor protein CI
Molecular weight formula_weight	12073.8 kDa
Source method src_method	man
Copy count entity_count	14

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C,D,E,F,G,H,I,J,K,L,M,N
Atom count atom_count	11886

Crystal Structure of the C-terminal domain of Bacteriophage 186 repressor

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

Repressor protein CI

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

2fkd__assembly_1__model_1

2fkd__assembly_1__model_1 | I(q)

2fkd__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 (1)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

6. Fold Classification (SCOP + CATH) 14 domains

CATH v4.4 (14 domains)

7. Citations (1)

Source organism organism	Enterobacteria phage 186
NCBI taxonomy ID ncbi_taxonomy_id	29252
Host organism host_organism	Escherichia coli

Crystal Structure of the C-terminal domain of Bacteriophage 186 repressor

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

Repressor protein CI

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

2fkd__assembly_1__model_1

2fkd__assembly_1__model_1 | I(q)

2fkd__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 (1)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

6. Fold Classification (SCOP + CATH) 14 domains

CATH v4.4 (14 domains)

7. Citations (1)