SAXSdb — 3c9i

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

Tail needle protein gp26

Bacteriophage P22

State in the Current Structure

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

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	VG26_BPP22
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 10–242； UniProt 1–233 Author chain B； PDBConstruct 10–242； UniProt 1–233 Author chain C； PDBConstruct 10–242； UniProt 1–233 Author chain D； PDBConstruct 10–242； UniProt 1–233 Author chain E； PDBConstruct 10–242； UniProt 1–233 Author chain F； PDBConstruct 10–242； UniProt 1–233

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	3c9i
Deposition date deposition_date	2008-02-15
Structure title title	Structure of P22 Tail-Needle GP26 Bound to Xenon Gas
Keywords keywords	P22, Tail-Needle, Xenon, Coiled-Coil, Protein Fiber, Coiled coil, Late protein, VIRAL PROTEIN; VIRAL 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.

3c9i__assembly_1__model_1

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

Download this curve (.dat)

3c9i__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

3c9i__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	71.77 Å
Rg (electron density)	75.27 Å
Total Rg	73.87 Å
Atom count	5282
Residues	708
Excluded volume	93038 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3c9i__assembly_1__model_1`	trimeric （3）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`3c9i__assembly_2__model_1`	trimeric （3）	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 (5)

Entity 1 Entity 1 polymer

Description description	Tail needle protein gp26
Molecular weight formula_weight	25640.4 kDa
Mutation mutation	L222M
Source method src_method	man
Copy count entity_count	6

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C,D,E,F
Atom count atom_count	11851

GALVPRGSHMADPSLNNPVVIQATRLDASILPRNVFSKSYLLYVIAQGTDVGAIAGKANEAGQGAYDAQVKNDEQDVELADHEARIKQLRIDVDDHESRITANTKAITALNVRVTTAEGEIASLQTNVSALDGRVTTAENNISALQADYVSKTATTSQSLASPLNVTTSYSVGGKKVVGARQTGWTAATGTANKGVFDADLTFAVSDTYTQSEIQAIANALITERRRTKAMEDALRAHGLID

Source Source

Source organism organism	Bacteriophage P22
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 non-polymer

Description description	XENON
Molecular weight formula_weight	131.3 kDa
Source method src_method	syn
Copy count entity_count	14

Entity 3 Entity 3 non-polymer

Description description	CALCIUM ION
Molecular weight formula_weight	40.1 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 4 Entity 4 non-polymer

Description description	CHLORIDE ION
Molecular weight formula_weight	35.5 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 5 Entity 5 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	1590

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6. Fold Classification (SCOP + CATH) 12 domains

CATH v4.4 (12 domains)

Domain ID domain_id	3c9iA01
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	5 — Single alpha-helices involved in coiled-coils or other helix-helix interfaces
Homologous superfamily homologous superfamily	340 —

Domain ID domain_id	3c9iA02
Class class	6 — Special
Architecture architecture	10 — Helix non-globular
Topology topology	140 — Helix Hairpins
Homologous superfamily homologous superfamily	940 —

Domain ID domain_id	3c9iB01
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	5 — Single alpha-helices involved in coiled-coils or other helix-helix interfaces
Homologous superfamily homologous superfamily	340 —

Domain ID domain_id	3c9iB02
Class class	6 — Special
Architecture architecture	10 — Helix non-globular
Topology topology	140 — Helix Hairpins
Homologous superfamily homologous superfamily	940 —

Domain ID domain_id	3c9iC01
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	5 — Single alpha-helices involved in coiled-coils or other helix-helix interfaces
Homologous superfamily homologous superfamily	340 —

Domain ID domain_id	3c9iC02
Class class	6 — Special
Architecture architecture	10 — Helix non-globular
Topology topology	140 — Helix Hairpins
Homologous superfamily homologous superfamily	940 —

Domain ID domain_id	3c9iD01
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	5 — Single alpha-helices involved in coiled-coils or other helix-helix interfaces
Homologous superfamily homologous superfamily	340 —

Domain ID domain_id	3c9iD02
Class class	6 — Special
Architecture architecture	10 — Helix non-globular
Topology topology	140 — Helix Hairpins
Homologous superfamily homologous superfamily	940 —

Domain ID domain_id	3c9iE01
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	5 — Single alpha-helices involved in coiled-coils or other helix-helix interfaces
Homologous superfamily homologous superfamily	340 —

Domain ID domain_id	3c9iE02
Class class	6 — Special
Architecture architecture	10 — Helix non-globular
Topology topology	140 — Helix Hairpins
Homologous superfamily homologous superfamily	940 —

Domain ID domain_id	3c9iF01
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	5 — Single alpha-helices involved in coiled-coils or other helix-helix interfaces
Homologous superfamily homologous superfamily	340 —

Domain ID domain_id	3c9iF02
Class class	6 — Special
Architecture architecture	10 — Helix non-globular
Topology topology	140 — Helix Hairpins
Homologous superfamily homologous superfamily	940 —

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Unit-cell length a length_a	40.539 Å
Unit-cell length b length_b	114.531 Å
Unit-cell length c length_c	172.045 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	91.01 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	12

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

Resolution resolution	1.950 Å
Low-resolution limit resolution_low	20.000 Å
R factor r_factor	0.2340
R_work r_work	0.2340
R_free r_free	0.2690

Structure of P22 Tail-Needle GP26 Bound to Xenon Gas

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

Tail needle protein gp26

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

3c9i__assembly_1__model_1

3c9i__assembly_1__model_1 | I(q)

3c9i__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 (5)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 non-polymer

Entity 5 Entity 5 water

6. Fold Classification (SCOP + CATH) 12 domains

CATH v4.4 (12 domains)

7. Citations (1)

Structure of P22 Tail-Needle GP26 Bound to Xenon Gas

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

Tail needle protein gp26

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

3c9i__assembly_1__model_1

3c9i__assembly_1__model_1 | I(q)

3c9i__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 (5)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 non-polymer

Entity 5 Entity 5 water

6. Fold Classification (SCOP + CATH) 12 domains

CATH v4.4 (12 domains)

7. Citations (1)