SAXSdb — 3s03

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

Motility protein B

Helicobacter pylori

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 2	SULFATE ION × 2 water × 2	Consistent with protein count
2	Protein homooligomer	Homooligomer	Protein 2	SULFATE ION × 5 water × 2	Consistent with protein count
3	Protein homooligomer	Homooligomer	Protein 4	SULFATE ION × 7 water × 4	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	MOTB_HELPY
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 7–166； UniProt 98–257 Author chain B； PDBConstruct 7–166； UniProt 98–257 Author chain C； PDBConstruct 7–166； UniProt 98–257 Author chain D； PDBConstruct 7–166； UniProt 98–257

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	3s03
Deposition date deposition_date	2011-05-13
Structure title title	The crystal structure of the periplasmic domain of Helicobacter pylori MotB (residues 97-256, P43).
Keywords keywords	peptidoglycan binding, flagellar rotation, chemotaxis, bacterial flagellar motor, membrane, MOTOR PROTEIN; MOTOR 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.

3s03__assembly_1__model_1

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

Download this curve (.dat)

3s03__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

3s03__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	27.30 Å
Rg (electron density)	26.86 Å
Total Rg	27.62 Å
Atom count	2258
Residues	281
Excluded volume	40088 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3s03__assembly_1__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`3s03__assembly_2__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
3	1	`3s03__assembly_3__model_1`	tetrameric （4）	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 (3)

Entity 1 Entity 1 polymer

Description description	Motility protein B
Molecular weight formula_weight	18876.4 kDa
Source method src_method	man
Copy count entity_count	4

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C,D
Atom count atom_count	4664

GIDPFTATIARKGEGSVLEQIDQGSILKLPSNLLFENATSDAINQDMMLYIERIAKIIQKLPKRVHINVRGFTDDTPLVKTRFKSHYELAANRAYRVMKVLIQYGVNPNQLSFSSYGSTNPIAPNDSLENRMKNNRVEIFFSTDANDLSKIHSILDNEFNPHKQQE

Source Source

Source organism organism	Helicobacter pylori
NCBI taxonomy ID ncbi_taxonomy_id	85962
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 non-polymer

Description description	SULFATE ION
Molecular weight formula_weight	96.1 kDa
Source method src_method	syn
Copy count entity_count	7

Entity 3 Entity 3 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	145

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6. Fold Classification (SCOP + CATH) 4 domains

CATH v4.4 (4 domains)

Domain ID domain_id	3s03A00
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	1330 — 60s Ribosomal Protein L30; Chain: A;
Homologous superfamily homologous superfamily	60 — OmpA-like domain

Domain ID domain_id	3s03B00
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	1330 — 60s Ribosomal Protein L30; Chain: A;
Homologous superfamily homologous superfamily	60 — OmpA-like domain

Domain ID domain_id	3s03C00
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	1330 — 60s Ribosomal Protein L30; Chain: A;
Homologous superfamily homologous superfamily	60 — OmpA-like domain

Domain ID domain_id	3s03D00
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	1330 — 60s Ribosomal Protein L30; Chain: A;
Homologous superfamily homologous superfamily	60 — OmpA-like domain

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Unit-cell length a length_a	71.669 Å
Unit-cell length b length_b	71.669 Å
Unit-cell length c length_c	126.236 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	16

Space group space_group	P 43
Space-group number int_tables_number	78
Crystal system crystal_system	—

Resolution resolution	2.500 Å
Low-resolution limit resolution_low	71.670 Å
R factor r_factor	0.2281
R_work r_work	0.2251
R_free r_free	0.2843

The crystal structure of the periplasmic domain of Helicobacter pylori MotB (residues 97-256, P43).

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

Motility protein B

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

3s03__assembly_1__model_1

3s03__assembly_1__model_1 | I(q)

3s03__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 (3)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 4 domains

CATH v4.4 (4 domains)

7. Citations (2)

The crystal structure of the periplasmic domain of Helicobacter pylori MotB (residues 97-256, P43).

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

Motility protein B

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

3s03__assembly_1__model_1

3s03__assembly_1__model_1 | I(q)

3s03__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 (3)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 4 domains

CATH v4.4 (4 domains)

7. Citations (2)