SAXSdb — 1kpt

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

KP4 TOXIN

OrganismNot specified

State in the Current Structure

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

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	KP4T_UMV4
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–105； UniProt 23–127 Author chain B； PDBConstruct 1–105； UniProt 23–127

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	1kpt
Deposition date deposition_date	1995-06-06
Structure title title	STRUCTURE AND FUNCTION OF A VIRALLY ENCODED FUNGAL TOXIN FROM USTILAGO MAYDIS: A FUNGAL AND MAMMALIAN CALCIUM CHANNEL INHIBITOR
Keywords keywords	KILLER TOXIN, VIRALLY ENCODED, SINGLE SUBUNIT, ALPHA/BETA FAMILY, LEFT-HANDED CROSSOVER, USTILAGO MAYDIS, FUNGAL TOXIN, TOXIN; TOXIN
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.

1kpt__assembly_1__model_1

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

Download this curve (.dat)

1kpt__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1kpt__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	18.80 Å
Rg (electron density)	17.99 Å
Total Rg	18.71 Å
Atom count	1530
Residues	210
Excluded volume	26360 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1kpt__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 (2)

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6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d1kpta_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.70 — Yeast killer toxins
Superfamily Superfamily superfamily	d.70.1 — Yeast killer toxins
Family Family family	d.70.1.1 — Virally encoded KP4 toxin

Domain ID domain_id	d1kptb_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.70 — Yeast killer toxins
Superfamily Superfamily superfamily	d.70.1 — Yeast killer toxins
Family Family family	d.70.1.1 — Virally encoded KP4 toxin

CATH v4.4 (2 domains)

Domain ID domain_id	1kptA00
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	430 — Killer Toxin P4; Chain A
Homologous superfamily homologous superfamily	10 — Killer Toxin P4, subunit A

Domain ID domain_id	1kptB00
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	430 — Killer Toxin P4; Chain A
Homologous superfamily homologous superfamily	10 — Killer Toxin P4, subunit A

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Unit-cell length a length_a	26.140 Å
Unit-cell length b length_b	63.760 Å
Unit-cell length c length_c	53.620 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	92.20 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	4

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

Resolution resolution	1.750 Å
Low-resolution limit resolution_low	6.000 Å
R factor r_factor	0.1740
R_work r_work	0.1740
R_free r_free	0.2160

Description description	KP4 TOXIN
Molecular weight formula_weight	11067.4 kDa
Source method src_method	nat
Copy count entity_count	2

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B
Atom count atom_count	1733

STRUCTURE AND FUNCTION OF A VIRALLY ENCODED FUNGAL TOXIN FROM USTILAGO MAYDIS: A FUNGAL AND MAMMALIAN CALCIUM CHANNEL INHIBITOR

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

KP4 TOXIN

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

1kpt__assembly_1__model_1

1kpt__assembly_1__model_1 | I(q)

1kpt__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

5. Entities and Polymers Entities & Polymers (2)

Entity 1 Entity 1 polymer

Polymer Polymer

Entity 2 Entity 2 water

6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (2)

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	140

STRUCTURE AND FUNCTION OF A VIRALLY ENCODED FUNGAL TOXIN FROM USTILAGO MAYDIS: A FUNGAL AND MAMMALIAN CALCIUM CHANNEL INHIBITOR

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

KP4 TOXIN

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

1kpt__assembly_1__model_1

1kpt__assembly_1__model_1 | I(q)

1kpt__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

5. Entities and Polymers Entities & Polymers (2)

Entity 1 Entity 1 polymer

Polymer Polymer

Entity 2 Entity 2 water

6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (2)