SAXSdb — 3hcq

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

Putative choline ABC transporter, periplasmic solute-binding component

Sinorhizobium meliloti

State in the Current Structure

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

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	Q92N37_RHIME
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–291； UniProt 28–318 Author chain B； PDBConstruct 1–291； UniProt 28–318

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	3hcq
Deposition date deposition_date	2009-05-06
Structure title title	Structural analysis of the choline binding protein ChoX in a semi-closed and ligand-free conformation
Keywords keywords	transport, ABC transporter, binding protein, semi-closed, CHOLINE-BINDING PROTEIN; CHOLINE-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.

3hcq__assembly_2__model_1

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

Download this curve (.dat)

3hcq__assembly_2__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

3hcq__assembly_2__model_1 | P(r) · Pending

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

Rg（Guinier）	22.71 Å
Rg (electron density)	21.71 Å
Total Rg	22.64 Å
Atom count	2176
Residues	288
Excluded volume	38603 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3hcq__assembly_1__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`3hcq__assembly_2__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 (1)

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6. Fold Classification (SCOP + CATH) 4 domains

CATH v4.4 (4 domains)

Domain ID domain_id	3hcqA01
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	190 — D-Maltodextrin-Binding Protein; domain 2
Homologous superfamily homologous superfamily	10 — Periplasmic binding protein-like II

Domain ID domain_id	3hcqA02
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	190 — D-Maltodextrin-Binding Protein; domain 2
Homologous superfamily homologous superfamily	100 — Glycine betaine-binding periplasmic protein; domain 2

Domain ID domain_id	3hcqB01
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	190 — D-Maltodextrin-Binding Protein; domain 2
Homologous superfamily homologous superfamily	10 — Periplasmic binding protein-like II

Domain ID domain_id	3hcqB02
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	190 — D-Maltodextrin-Binding Protein; domain 2
Homologous superfamily homologous superfamily	100 — Glycine betaine-binding periplasmic protein; domain 2

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Unit-cell length a length_a	34.100 Å
Unit-cell length b length_b	232.500 Å
Unit-cell length c length_c	47.300 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.20 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	4

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

Resolution resolution	2.890 Å
Low-resolution limit resolution_low	19.470 Å
R factor r_factor	0.2446
R_work r_work	0.2424
R_free r_free	0.2847

Description description	Putative choline ABC transporter, periplasmic solute-binding component
Molecular weight formula_weight	32302.0 kDa
Mutation mutation	G251D
Source method src_method	man
Copy count entity_count	2

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B
Atom count atom_count	4352

Structural analysis of the choline binding protein ChoX in a semi-closed and ligand-free conformation

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

Putative choline ABC transporter, periplasmic solute-binding component

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

3hcq__assembly_2__model_1

3hcq__assembly_2__model_1 | I(q)

3hcq__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 (1)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

6. Fold Classification (SCOP + CATH) 4 domains

CATH v4.4 (4 domains)

7. Citations (1)

Source organism organism	Sinorhizobium meliloti
Common name common_name	Sinorhizobium meliloti
NCBI taxonomy ID ncbi_taxonomy_id	382
Host organism host_organism	Escherichia coli BL21

Structural analysis of the choline binding protein ChoX in a semi-closed and ligand-free conformation

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

Putative choline ABC transporter, periplasmic solute-binding component

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

3hcq__assembly_2__model_1

3hcq__assembly_2__model_1 | I(q)

3hcq__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 (1)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

6. Fold Classification (SCOP + CATH) 4 domains

CATH v4.4 (4 domains)

7. Citations (1)