SAXSdb — 1ixm

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

PROTEIN (SPORULATION RESPONSE REGULATORY PROTEIN)

Bacillus subtilis

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

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	SP0B_BACSU
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–192； UniProt 1–192 Author chain B； PDBConstruct 1–192； UniProt 1–192

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	1ixm
Deposition date deposition_date	1998-11-06
Structure title title	CRYSTAL STRUCTURE OF SPOOB FROM BACILLUS SUBTILIS
Keywords keywords	PHOSPHOTRANSFERASE, SPORULATION RESPONSE REGULATOR, TWO COMPONENT SYSTEM, REGULATORY PROTEIN, TRANSFERASE; TRANSFERASE
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.

1ixm__assembly_1__model_1

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

Download this curve (.dat)

1ixm__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1ixm__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	24.28 Å
Rg (electron density)	23.58 Å
Total Rg	24.32 Å
Atom count	2489
Residues	343
Excluded volume	44289 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1ixm__assembly_1__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) 6 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d1ixma_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.123 — Sporulation response regulatory protein Spo0B
Superfamily Superfamily superfamily	d.123.1 — Sporulation response regulatory protein Spo0B
Family Family family	d.123.1.1 — Sporulation response regulatory protein Spo0B

Domain ID domain_id	d1ixmb_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.123 — Sporulation response regulatory protein Spo0B
Superfamily Superfamily superfamily	d.123.1 — Sporulation response regulatory protein Spo0B
Family Family family	d.123.1.1 — Sporulation response regulatory protein Spo0B

CATH v4.4 (4 domains)

Domain ID domain_id	1ixmA01
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	287 — Helix Hairpins
Homologous superfamily homologous superfamily	130 — Signal transduction histidine kinase, dimerisation/phosphotransfer (DHp) domain

Domain ID domain_id	1ixmA02
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	565 — Heat Shock Protein 90
Homologous superfamily homologous superfamily	30 — Sporulation initiation phosphotransferase B (SpoOB), C-terminal domain

Domain ID domain_id	1ixmB01
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	287 — Helix Hairpins
Homologous superfamily homologous superfamily	130 — Signal transduction histidine kinase, dimerisation/phosphotransfer (DHp) domain

Domain ID domain_id	1ixmB02
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	565 — Heat Shock Protein 90
Homologous superfamily homologous superfamily	30 — Sporulation initiation phosphotransferase B (SpoOB), C-terminal domain

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Unit-cell length a length_a	44.400 Å
Unit-cell length b length_b	94.400 Å
Unit-cell length c length_c	109.700 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	8

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

Resolution resolution	2.600 Å
Low-resolution limit resolution_low	35.000 Å
R factor r_factor	—
R_work r_work	0.2170
R_free r_free	0.3140

Description description	PROTEIN (SPORULATION RESPONSE REGULATORY PROTEIN)
Molecular weight formula_weight	22573.6 kDa
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	2489

CRYSTAL STRUCTURE OF SPOOB FROM BACILLUS SUBTILIS

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

PROTEIN (SPORULATION RESPONSE REGULATORY 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

1ixm__assembly_1__model_1

1ixm__assembly_1__model_1 | I(q)

1ixm__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) 6 domains

SCOP 2.08 (2 domains)

CATH v4.4 (4 domains)

7. Citations (1)

Source organism organism	Bacillus subtilis
NCBI taxonomy ID ncbi_taxonomy_id	1423
Host organism host_organism	Bacillus subtilis

CRYSTAL STRUCTURE OF SPOOB FROM BACILLUS SUBTILIS

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

PROTEIN (SPORULATION RESPONSE REGULATORY 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

1ixm__assembly_1__model_1

1ixm__assembly_1__model_1 | I(q)

1ixm__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) 6 domains

SCOP 2.08 (2 domains)

CATH v4.4 (4 domains)

7. Citations (1)