SAXSdb — 1kzq

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

Major Surface Antigen P30

Toxoplasma gondii

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	P30_TOXGO
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–289； UniProt 48–336 Author chain B； PDBConstruct 1–289； UniProt 48–336

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	1kzq
Deposition date deposition_date	2002-02-07
Structure title title	crystal structure of a parasite protein
Keywords keywords	SAG1, major surface antigen, Toxoplasma Gondii, parasite invasion, MAD, IMMUNE SYSTEM; IMMUNE SYSTEM
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.

1kzq__assembly_1__model_1

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

Download this curve (.dat)

1kzq__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1kzq__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	27.06 Å
Rg (electron density)	26.33 Å
Total Rg	27.06 Å
Atom count	3702
Residues	506
Excluded volume	66049 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1kzq__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) 8 domains

SCOP 2.08 (4 domains)

Domain ID domain_id	d1kzqa1
Class class	b — All beta proteins
Fold Fold fold	b.6 — Cupredoxin-like
Superfamily Superfamily superfamily	b.6.2 — Major surface antigen p30, SAG1
Family Family family	b.6.2.1 — Major surface antigen p30, SAG1

Domain ID domain_id	d1kzqa2
Class class	b — All beta proteins
Fold Fold fold	b.6 — Cupredoxin-like
Superfamily Superfamily superfamily	b.6.2 — Major surface antigen p30, SAG1
Family Family family	b.6.2.1 — Major surface antigen p30, SAG1

Domain ID domain_id	d1kzqb1
Class class	b — All beta proteins
Fold Fold fold	b.6 — Cupredoxin-like
Superfamily Superfamily superfamily	b.6.2 — Major surface antigen p30, SAG1
Family Family family	b.6.2.1 — Major surface antigen p30, SAG1

Domain ID domain_id	d1kzqb2
Class class	b — All beta proteins
Fold Fold fold	b.6 — Cupredoxin-like
Superfamily Superfamily superfamily	b.6.2 — Major surface antigen p30, SAG1
Family Family family	b.6.2.1 — Major surface antigen p30, SAG1

CATH v4.4 (4 domains)

Domain ID domain_id	1kzqA01
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	1320 — SRS domain

Domain ID domain_id	1kzqA02
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	1320 — SRS domain

Domain ID domain_id	1kzqB01
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	1320 — SRS domain

Domain ID domain_id	1kzqB02
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	1320 — SRS domain

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Unit-cell length a length_a	101.840 Å
Unit-cell length b length_b	101.840 Å
Unit-cell length c length_c	125.500 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	P 41 21 2
Space-group number int_tables_number	92
Crystal system crystal_system	—

Resolution resolution	1.700 Å
Low-resolution limit resolution_low	50.000 Å
R factor r_factor	0.2010
R_work r_work	0.2000
R_free r_free	0.2260

Description description	Major Surface Antigen P30
Molecular weight formula_weight	29829.9 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	4375

crystal structure of a parasite protein

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

Major Surface Antigen P30

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

1kzq__assembly_1__model_1

1kzq__assembly_1__model_1 | I(q)

1kzq__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

Source Source

Entity 2 Entity 2 water

6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (1)

Source organism organism	Toxoplasma gondii
NCBI taxonomy ID ncbi_taxonomy_id	5811
Host organism host_organism	Trichoplusia ni

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	673

crystal structure of a parasite protein

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

Major Surface Antigen P30

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

1kzq__assembly_1__model_1

1kzq__assembly_1__model_1 | I(q)

1kzq__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

Source Source

Entity 2 Entity 2 water

6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (1)