1lkt

CRYSTAL STRUCTURE OF THE HEAD-BINDING DOMAIN OF PHAGE P22 TAILSPIKE PROTEIN

Method: X-RAY DIFFRACTION

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

TAILSPIKE PROTEIN

Enterobacteria phage P22

State in the Current Structure

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

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	TSPE_BPP22
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–104； UniProt 6–109 Author chain B； PDBConstruct 1–104； UniProt 6–109 Author chain C； PDBConstruct 1–104； UniProt 6–109 Author chain D； PDBConstruct 1–104； UniProt 6–109 Author chain E； PDBConstruct 1–104； UniProt 6–109 Author chain F； PDBConstruct 1–104； UniProt 6–109

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	1lkt
Deposition date deposition_date	1997-10-17
Structure title title	CRYSTAL STRUCTURE OF THE HEAD-BINDING DOMAIN OF PHAGE P22 TAILSPIKE PROTEIN
Keywords keywords	VIRUS PROTEIN, SALMONELLA PHAGE P22, TELLUROMETHIONINE, 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.

1lkt__assembly_1__model_1

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

Download this curve (.dat)

1lkt__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1lkt__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	20.85 Å
Rg (electron density)	19.51 Å
Total Rg	20.40 Å
Atom count	2922
Residues	312
Excluded volume	42677 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1lkt__assembly_1__model_1`	trimeric （3）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`1lkt__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 (2)

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6. Fold Classification (SCOP + CATH) 12 domains

SCOP 2.08 (6 domains)

Domain ID domain_id	d1lkta_
Class class	b — All beta proteins
Fold Fold fold	b.90 — Head-binding domain of phage P22 tailspike protein
Superfamily Superfamily superfamily	b.90.1 — Head-binding domain of phage P22 tailspike protein
Family Family family	b.90.1.1 — Head-binding domain of phage P22 tailspike protein

Domain ID domain_id	d1lktb_
Class class	b — All beta proteins
Fold Fold fold	b.90 — Head-binding domain of phage P22 tailspike protein
Superfamily Superfamily superfamily	b.90.1 — Head-binding domain of phage P22 tailspike protein
Family Family family	b.90.1.1 — Head-binding domain of phage P22 tailspike protein

Domain ID domain_id	d1lktc_
Class class	b — All beta proteins
Fold Fold fold	b.90 — Head-binding domain of phage P22 tailspike protein
Superfamily Superfamily superfamily	b.90.1 — Head-binding domain of phage P22 tailspike protein
Family Family family	b.90.1.1 — Head-binding domain of phage P22 tailspike protein

Domain ID domain_id	d1lktd_
Class class	b — All beta proteins
Fold Fold fold	b.90 — Head-binding domain of phage P22 tailspike protein
Superfamily Superfamily superfamily	b.90.1 — Head-binding domain of phage P22 tailspike protein
Family Family family	b.90.1.1 — Head-binding domain of phage P22 tailspike protein

Domain ID domain_id	d1lkte_
Class class	b — All beta proteins
Fold Fold fold	b.90 — Head-binding domain of phage P22 tailspike protein
Superfamily Superfamily superfamily	b.90.1 — Head-binding domain of phage P22 tailspike protein
Family Family family	b.90.1.1 — Head-binding domain of phage P22 tailspike protein

Domain ID domain_id	d1lktf_
Class class	b — All beta proteins
Fold Fold fold	b.90 — Head-binding domain of phage P22 tailspike protein
Superfamily Superfamily superfamily	b.90.1 — Head-binding domain of phage P22 tailspike protein
Family Family family	b.90.1.1 — Head-binding domain of phage P22 tailspike protein

CATH v4.4 (6 domains)

Domain ID domain_id	1lktA00
Class class	2 — Mainly Beta
Architecture architecture	170 — Beta Complex
Topology topology	14 — Tailspike Protein; Chain
Homologous superfamily homologous superfamily	10 — Phage P22 tailspike-like, N-terminal domain

Domain ID domain_id	1lktB00
Class class	2 — Mainly Beta
Architecture architecture	170 — Beta Complex
Topology topology	14 — Tailspike Protein; Chain
Homologous superfamily homologous superfamily	10 — Phage P22 tailspike-like, N-terminal domain

Domain ID domain_id	1lktC00
Class class	2 — Mainly Beta
Architecture architecture	170 — Beta Complex
Topology topology	14 — Tailspike Protein; Chain
Homologous superfamily homologous superfamily	10 — Phage P22 tailspike-like, N-terminal domain

Domain ID domain_id	1lktD00
Class class	2 — Mainly Beta
Architecture architecture	170 — Beta Complex
Topology topology	14 — Tailspike Protein; Chain
Homologous superfamily homologous superfamily	10 — Phage P22 tailspike-like, N-terminal domain

Domain ID domain_id	1lktE00
Class class	2 — Mainly Beta
Architecture architecture	170 — Beta Complex
Topology topology	14 — Tailspike Protein; Chain
Homologous superfamily homologous superfamily	10 — Phage P22 tailspike-like, N-terminal domain

Domain ID domain_id	1lktF00
Class class	2 — Mainly Beta
Architecture architecture	170 — Beta Complex
Topology topology	14 — Tailspike Protein; Chain
Homologous superfamily homologous superfamily	10 — Phage P22 tailspike-like, N-terminal domain

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Unit-cell length a length_a	57.300 Å
Unit-cell length b length_b	82.100 Å
Unit-cell length c length_c	73.800 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.90 °
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	2.600 Å
Low-resolution limit resolution_low	8.000 Å
R factor r_factor	0.1990
R_work r_work	0.1990
R_free r_free	—

Description description	TAILSPIKE PROTEIN
Molecular weight formula_weight	11307.8 kDa
Source method src_method	man
Copy count entity_count	6

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C,D,E,F
Atom count atom_count	7140

CRYSTAL STRUCTURE OF THE HEAD-BINDING DOMAIN OF PHAGE P22 TAILSPIKE PROTEIN

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

TAILSPIKE 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

1lkt__assembly_1__model_1

1lkt__assembly_1__model_1 | I(q)

1lkt__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) 12 domains

SCOP 2.08 (6 domains)

CATH v4.4 (6 domains)

7. Citations (1)

Source organism organism	Enterobacteria phage P22
NCBI taxonomy ID ncbi_taxonomy_id	10754
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	432

CRYSTAL STRUCTURE OF THE HEAD-BINDING DOMAIN OF PHAGE P22 TAILSPIKE PROTEIN

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

TAILSPIKE 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

1lkt__assembly_1__model_1

1lkt__assembly_1__model_1 | I(q)

1lkt__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) 12 domains

SCOP 2.08 (6 domains)

CATH v4.4 (6 domains)

7. Citations (1)