SAXSdb — 2ob9

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

Tail assembly chaperone

Enterobacteria phage HK97

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 8	water × 8	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	Q9MCS6_BPHK7
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 3–130； UniProt 1–128 Author chain B； PDBConstruct 3–130； UniProt 1–128

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	2ob9
Deposition date deposition_date	2006-12-18
Structure title title	Structure of bacteriophage HK97 tail assembly chaperone
Keywords keywords	Bacteriophage HK97, morphogenesis, tail assembly chaperone, CHAPERONE; CHAPERONE
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.

2ob9__assembly_1__model_1

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

Download this curve (.dat)

2ob9__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

2ob9__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	39.49 Å
Rg (electron density)	38.71 Å
Total Rg	39.63 Å
Atom count	6780
Residues	824
Excluded volume	121610 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`2ob9__assembly_1__model_1`	octameric （8）	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) 2 domains

CATH v4.4 (2 domains)

Domain ID domain_id	2ob9A00
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	2220 — rbstp2171
Homologous superfamily homologous superfamily	20 — Phage tail assembly chaperone gp13-like

Domain ID domain_id	2ob9B00
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	2220 — rbstp2171
Homologous superfamily homologous superfamily	20 — Phage tail assembly chaperone gp13-like

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Unit-cell length a length_a	101.140 Å
Unit-cell length b length_b	101.140 Å
Unit-cell length c length_c	63.382 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	I 4
Space-group number int_tables_number	79
Crystal system crystal_system	—

Resolution resolution	2.300 Å
Low-resolution limit resolution_low	36.800 Å
R factor r_factor	0.2348
R_work r_work	0.2320
R_free r_free	0.2914

Description description	Tail assembly chaperone
Molecular weight formula_weight	14737.2 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	1764

Structure of bacteriophage HK97 tail assembly chaperone

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

Tail assembly chaperone

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

2ob9__assembly_1__model_1

2ob9__assembly_1__model_1 | I(q)

2ob9__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 (2)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 water

6. Fold Classification (SCOP + CATH) 2 domains

CATH v4.4 (2 domains)

7. Citations (1)

Source organism organism	Enterobacteria phage HK97
NCBI taxonomy ID ncbi_taxonomy_id	37554
Host organism host_organism	Escherichia coli BL21(DE3)

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	53

Structure of bacteriophage HK97 tail assembly chaperone

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

Tail assembly chaperone

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

2ob9__assembly_1__model_1

2ob9__assembly_1__model_1 | I(q)

2ob9__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 (2)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 water

6. Fold Classification (SCOP + CATH) 2 domains

CATH v4.4 (2 domains)

7. Citations (1)