SAXSdb — 3cnb

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

DNA-binding response regulator, merR family

Colwellia psychrerythraea

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
3	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	Q47UF8_COLP3
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 4–135； UniProt 61–192 Author chain B； PDBConstruct 4–135； UniProt 61–192 Author chain C； PDBConstruct 4–135； UniProt 61–192

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	3cnb
Deposition date deposition_date	2008-03-25
Structure title title	Crystal structure of signal receiver domain of DNA binding response regulator protein (merR) from Colwellia psychrerythraea 34H
Keywords keywords	;SIGNAL RECEIVER DOMAIN, DNA BINDING PROTEIN, PROTEIN STRUCTURE INITIATIVE, PSI-2, New York SGX Research Center for Structural Genomics, NYSGXRC, STRUCTURAL GENOMICS, DNA-binding ;; 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.

3cnb__assembly_2__model_1

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

Download this curve (.dat)

3cnb__assembly_2__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

3cnb__assembly_2__model_1 | P(r) · Pending

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

Rg（Guinier）	14.97 Å
Rg (electron density)	13.40 Å
Total Rg	14.68 Å
Atom count	965
Residues	124
Excluded volume	17625 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3cnb__assembly_1__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`3cnb__assembly_2__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
3	1	`3cnb__assembly_3__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) 3 domains

CATH v4.4 (3 domains)

Domain ID domain_id	3cnbA00
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	2300 — Response regulator

Domain ID domain_id	3cnbB00
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	2300 — Response regulator

Domain ID domain_id	3cnbC00
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	2300 — Response regulator

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Unit-cell length a length_a	55.277 Å
Unit-cell length b length_b	96.446 Å
Unit-cell length c length_c	178.276 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	C 2 2 21
Space-group number int_tables_number	20
Crystal system crystal_system	—

Resolution resolution	2.000 Å
Low-resolution limit resolution_low	20.000 Å
R factor r_factor	0.2080
R_work r_work	0.2064
R_free r_free	0.2560

Description description	DNA-binding response regulator, merR family
Molecular weight formula_weight	15987.6 kDa
Source method src_method	man
Copy count entity_count	3

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C
Atom count atom_count	3070

Crystal structure of signal receiver domain of DNA binding response regulator protein (merR) from Colwellia psychrerythraea 34H

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

DNA-binding response regulator, merR family

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

3cnb__assembly_2__model_1

3cnb__assembly_2__model_1 | I(q)

3cnb__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) 3 domains

CATH v4.4 (3 domains)

7. Citations (1)

Source organism organism	Colwellia psychrerythraea
NCBI taxonomy ID ncbi_taxonomy_id	167879
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	170

Crystal structure of signal receiver domain of DNA binding response regulator protein (merR) from Colwellia psychrerythraea 34H

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

DNA-binding response regulator, merR family

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

3cnb__assembly_2__model_1

3cnb__assembly_2__model_1 | I(q)

3cnb__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) 3 domains

CATH v4.4 (3 domains)

7. Citations (1)