1ox9

Crystal structure of SspB-ssrA complex

Method: X-RAY DIFFRACTION

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

Stringent starvation protein B

Escherichia coli

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 4	ssrA × 2	Consistent with protein count
2	Protein heterocomplex	Heteromer	Protein 4	ssrA × 2	Consistent with protein count
3	Protein heterocomplex	Heteromer	Protein 4	ssrA × 2	Consistent with protein count
4	Protein heterocomplex	Heteromer	Protein 4	ssrA × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	SSPB_ECOLI
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–108； UniProt 4–111 Author chain B； PDBConstruct 1–108； UniProt 4–111 Author chain C； PDBConstruct 1–108； UniProt 4–111 Author chain D； PDBConstruct 1–108； UniProt 4–111 Author chain E； PDBConstruct 1–108； UniProt 4–111 Author chain F； PDBConstruct 1–108； UniProt 4–111 Author chain G； PDBConstruct 1–108； UniProt 4–111 Author chain H； PDBConstruct 1–108； UniProt 4–111

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	1ox9
Deposition date deposition_date	2003-04-01
Structure title title	Crystal structure of SspB-ssrA complex
Keywords keywords	SspB-ssrA, HYDROLASE ACTIVATOR; HYDROLASE ACTIVATOR
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.

1ox9__assembly_3__model_1

Assembly 3 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

1ox9__assembly_3__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1ox9__assembly_3__model_1 | P(r) · Pending

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

Rg（Guinier）	21.25 Å
Rg (electron density)	20.20 Å
Total Rg	21.05 Å
Atom count	1820
Residues	232
Excluded volume	32244 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1ox9__assembly_1__model_1`	tetrameric （4）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`1ox9__assembly_2__model_1`	tetrameric （4）	Success	4.1.3-1-20251215 (887e7ef)	View Download
3	1	`1ox9__assembly_3__model_1`	tetrameric （4）	Success	4.1.3-1-20251215 (887e7ef)	View Download
4	1	`1ox9__assembly_4__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 (2)

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6. Fold Classification (SCOP + CATH) 16 domains

SCOP 2.08 (8 domains)

Domain ID domain_id	d1ox9a_
Class class	b — All beta proteins
Fold Fold fold	b.136 — SspB-like
Superfamily Superfamily superfamily	b.136.1 — SspB-like
Family Family family	b.136.1.1 — Stringent starvation protein B, SspB

Domain ID domain_id	d1ox9b_
Class class	b — All beta proteins
Fold Fold fold	b.136 — SspB-like
Superfamily Superfamily superfamily	b.136.1 — SspB-like
Family Family family	b.136.1.1 — Stringent starvation protein B, SspB

Domain ID domain_id	d1ox9c_
Class class	b — All beta proteins
Fold Fold fold	b.136 — SspB-like
Superfamily Superfamily superfamily	b.136.1 — SspB-like
Family Family family	b.136.1.1 — Stringent starvation protein B, SspB

Domain ID domain_id	d1ox9d_
Class class	b — All beta proteins
Fold Fold fold	b.136 — SspB-like
Superfamily Superfamily superfamily	b.136.1 — SspB-like
Family Family family	b.136.1.1 — Stringent starvation protein B, SspB

Domain ID domain_id	d1ox9e_
Class class	b — All beta proteins
Fold Fold fold	b.136 — SspB-like
Superfamily Superfamily superfamily	b.136.1 — SspB-like
Family Family family	b.136.1.1 — Stringent starvation protein B, SspB

Domain ID domain_id	d1ox9f_
Class class	b — All beta proteins
Fold Fold fold	b.136 — SspB-like
Superfamily Superfamily superfamily	b.136.1 — SspB-like
Family Family family	b.136.1.1 — Stringent starvation protein B, SspB

Domain ID domain_id	d1ox9g_
Class class	b — All beta proteins
Fold Fold fold	b.136 — SspB-like
Superfamily Superfamily superfamily	b.136.1 — SspB-like
Family Family family	b.136.1.1 — Stringent starvation protein B, SspB

Domain ID domain_id	d1ox9h_
Class class	b — All beta proteins
Fold Fold fold	b.136 — SspB-like
Superfamily Superfamily superfamily	b.136.1 — SspB-like
Family Family family	b.136.1.1 — Stringent starvation protein B, SspB

CATH v4.4 (8 domains)

Domain ID domain_id	1ox9A00
Class class	2 — Mainly Beta
Architecture architecture	30 — Roll
Topology topology	30 — SH3 type barrels.
Homologous superfamily homologous superfamily	220 — SspB-like

Domain ID domain_id	1ox9B00
Class class	2 — Mainly Beta
Architecture architecture	30 — Roll
Topology topology	30 — SH3 type barrels.
Homologous superfamily homologous superfamily	220 — SspB-like

Domain ID domain_id	1ox9C00
Class class	2 — Mainly Beta
Architecture architecture	30 — Roll
Topology topology	30 — SH3 type barrels.
Homologous superfamily homologous superfamily	220 — SspB-like

Domain ID domain_id	1ox9D00
Class class	2 — Mainly Beta
Architecture architecture	30 — Roll
Topology topology	30 — SH3 type barrels.
Homologous superfamily homologous superfamily	220 — SspB-like

Domain ID domain_id	1ox9E00
Class class	2 — Mainly Beta
Architecture architecture	30 — Roll
Topology topology	30 — SH3 type barrels.
Homologous superfamily homologous superfamily	220 — SspB-like

Domain ID domain_id	1ox9F00
Class class	2 — Mainly Beta
Architecture architecture	30 — Roll
Topology topology	30 — SH3 type barrels.
Homologous superfamily homologous superfamily	220 — SspB-like

Domain ID domain_id	1ox9G00
Class class	2 — Mainly Beta
Architecture architecture	30 — Roll
Topology topology	30 — SH3 type barrels.
Homologous superfamily homologous superfamily	220 — SspB-like

Domain ID domain_id	1ox9H00
Class class	2 — Mainly Beta
Architecture architecture	30 — Roll
Topology topology	30 — SH3 type barrels.
Homologous superfamily homologous superfamily	220 — SspB-like

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Unit-cell length a length_a	81.513 Å
Unit-cell length b length_b	81.524 Å
Unit-cell length c length_c	131.773 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	92.83 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	16

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

Resolution resolution	2.900 Å
Low-resolution limit resolution_low	30.000 Å
R factor r_factor	0.2450
R_work r_work	0.2430
R_free r_free	0.2970

Description description	Stringent starvation protein B
Molecular weight formula_weight	12018.7 kDa
Source method src_method	man
Copy count entity_count	8

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C,D,E,F,G,H
Atom count atom_count	7280

Crystal structure of SspB-ssrA complex

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

Stringent starvation 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

1ox9__assembly_3__model_1

1ox9__assembly_3__model_1 | I(q)

1ox9__assembly_3__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 polymer

Polymer Polymer

6. Fold Classification (SCOP + CATH) 16 domains

SCOP 2.08 (8 domains)

CATH v4.4 (8 domains)

7. Citations (1)

Source organism organism	Escherichia coli
NCBI taxonomy ID ncbi_taxonomy_id	83334
Host organism host_organism	Escherichia coli

Description description	ssrA
Molecular weight formula_weight	866.8 kDa
Source method src_method	syn
Copy count entity_count	8

Crystal structure of SspB-ssrA complex

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

Stringent starvation 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

1ox9__assembly_3__model_1

1ox9__assembly_3__model_1 | I(q)

1ox9__assembly_3__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 polymer

Polymer Polymer

6. Fold Classification (SCOP + CATH) 16 domains

SCOP 2.08 (8 domains)

CATH v4.4 (8 domains)

7. Citations (1)