3e5q

Unbound Oxidised CprK

Method: X-RAY DIFFRACTION

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

Cyclic nucleotide-binding protein

Desulfitobacterium hafniense

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 2	No other associated polymer	Consistent with protein count
2	Protein homooligomer	Homooligomer	Protein 2	No other associated polymer	Consistent with protein count
3	Protein homooligomer	Homooligomer	Protein 2	No other associated polymer	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	Q18R04_DESHD
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–232； UniProt 1–232 Author chain B； PDBConstruct 1–232； UniProt 1–232 Author chain C； PDBConstruct 1–232； UniProt 1–232 Author chain D； PDBConstruct 1–232； UniProt 1–232 Author chain E； PDBConstruct 1–232； UniProt 1–232 Author chain F； PDBConstruct 1–232； UniProt 1–232

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	3e5q
Deposition date deposition_date	2008-08-14
Structure title title	Unbound Oxidised CprK
Keywords keywords	CprK, Halorespiration, transcriptional regulator, TRANSCRIPTION REGULATION; TRANSCRIPTION REGULATION
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.

3e5q__assembly_1__model_1

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

Download this curve (.dat)

3e5q__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

3e5q__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	26.19 Å
Rg (electron density)	25.13 Å
Total Rg	26.04 Å
Atom count	3211
Residues	403
Excluded volume	58055 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3e5q__assembly_1__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`3e5q__assembly_2__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
3	1	`3e5q__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 (1)

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6. Fold Classification (SCOP + CATH) 12 domains

CATH v4.4 (12 domains)

Domain ID domain_id	3e5qA01
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	120 — Jelly Rolls
Homologous superfamily homologous superfamily	10 — Jelly Rolls

Domain ID domain_id	3e5qA02
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	10 — Arc Repressor Mutant, subunit A
Homologous superfamily homologous superfamily	10 — Winged helix-like DNA-binding domain superfamily/Winged helix DNA-binding domain

Domain ID domain_id	3e5qB01
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	120 — Jelly Rolls
Homologous superfamily homologous superfamily	10 — Jelly Rolls

Domain ID domain_id	3e5qB02
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	10 — Arc Repressor Mutant, subunit A
Homologous superfamily homologous superfamily	10 — Winged helix-like DNA-binding domain superfamily/Winged helix DNA-binding domain

Domain ID domain_id	3e5qC01
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	120 — Jelly Rolls
Homologous superfamily homologous superfamily	10 — Jelly Rolls

Domain ID domain_id	3e5qC02
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	10 — Arc Repressor Mutant, subunit A
Homologous superfamily homologous superfamily	10 — Winged helix-like DNA-binding domain superfamily/Winged helix DNA-binding domain

Domain ID domain_id	3e5qD01
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	120 — Jelly Rolls
Homologous superfamily homologous superfamily	10 — Jelly Rolls

Domain ID domain_id	3e5qD02
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	10 — Arc Repressor Mutant, subunit A
Homologous superfamily homologous superfamily	10 — Winged helix-like DNA-binding domain superfamily/Winged helix DNA-binding domain

Domain ID domain_id	3e5qE01
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	120 — Jelly Rolls
Homologous superfamily homologous superfamily	10 — Jelly Rolls

Domain ID domain_id	3e5qE02
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	10 — Arc Repressor Mutant, subunit A
Homologous superfamily homologous superfamily	10 — Winged helix-like DNA-binding domain superfamily/Winged helix DNA-binding domain

Domain ID domain_id	3e5qF01
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	120 — Jelly Rolls
Homologous superfamily homologous superfamily	10 — Jelly Rolls

Domain ID domain_id	3e5qF02
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	10 — Arc Repressor Mutant, subunit A
Homologous superfamily homologous superfamily	10 — Winged helix-like DNA-binding domain superfamily/Winged helix DNA-binding domain

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Unit-cell length a length_a	79.405 Å
Unit-cell length b length_b	64.710 Å
Unit-cell length c length_c	148.355 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	105.29 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	12

Space group space_group	P 1 21 1
Space-group number int_tables_number	4
Crystal system crystal_system	—

Resolution resolution	3.200 Å
Low-resolution limit resolution_low	142.860 Å
R factor r_factor	0.2609
R_work r_work	0.2577
R_free r_free	0.3176

Description description	Cyclic nucleotide-binding protein
Molecular weight formula_weight	28395.7 kDa
Source method src_method	man
Copy count entity_count	6

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C,D,E,F
Atom count atom_count	9641

Unbound Oxidised CprK

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

Cyclic nucleotide-binding protein

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

3e5q__assembly_1__model_1

3e5q__assembly_1__model_1 | I(q)

3e5q__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) 12 domains

CATH v4.4 (12 domains)

7. Citations (1)

Source organism organism	Desulfitobacterium hafniense
NCBI taxonomy ID ncbi_taxonomy_id	272564
Host organism host_organism	Escherichia coli

Unbound Oxidised CprK

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

Cyclic nucleotide-binding protein

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

3e5q__assembly_1__model_1

3e5q__assembly_1__model_1 | I(q)

3e5q__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) 12 domains

CATH v4.4 (12 domains)

7. Citations (1)