SAXSdb — 1kut

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

Phosphoribosylaminoimidazole-succinocarboxamide synthase

Thermotoga maritima

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	PUR7_THEMA
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–230； UniProt 1–230 Author chain B； PDBConstruct 1–230； UniProt 1–230

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	1kut
Deposition date deposition_date	2002-01-22
Structure title title	Structural Genomics, Protein TM1243, (SAICAR synthetase)
Keywords keywords	structural genomics, SAICAR synthetase, PSI, Protein Structure Initiative, Midwest Center for Structural Genomics, MCSG, LIGASE; STRUCTURAL GENOMICS, LIGASE
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.

1kut__assembly_1__model_1

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

Download this curve (.dat)

1kut__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1kut__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	27.34 Å
Rg (electron density)	26.62 Å
Total Rg	27.31 Å
Atom count	3502
Residues	427
Excluded volume	63502 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1kut__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) 6 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d1kuta_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.143 — SAICAR synthase-like
Superfamily Superfamily superfamily	d.143.1 — SAICAR synthase-like
Family Family family	d.143.1.1 — SAICAR synthase

Domain ID domain_id	d1kutb_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.143 — SAICAR synthase-like
Superfamily Superfamily superfamily	d.143.1 — SAICAR synthase-like
Family Family family	d.143.1.1 — SAICAR synthase

CATH v4.4 (4 domains)

Domain ID domain_id	1kutA01
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	200 — Phosphorylase Kinase; domain 1
Homologous superfamily homologous superfamily	20 — Phosphorylase Kinase; domain 1

Domain ID domain_id	1kutA02
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	470 — D-amino Acid Aminotransferase; Chain A, domain 1
Homologous superfamily homologous superfamily	20 — ATP-grasp fold, B domain

Domain ID domain_id	1kutB01
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	200 — Phosphorylase Kinase; domain 1
Homologous superfamily homologous superfamily	20 — Phosphorylase Kinase; domain 1

Domain ID domain_id	1kutB02
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	470 — D-amino Acid Aminotransferase; Chain A, domain 1
Homologous superfamily homologous superfamily	20 — ATP-grasp fold, B domain

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Unit-cell length a length_a	63.509 Å
Unit-cell length b length_b	43.067 Å
Unit-cell length c length_c	80.217 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	92.30 °
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	2.200 Å
Low-resolution limit resolution_low	10.000 Å
R factor r_factor	—
R_work r_work	0.2450
R_free r_free	0.2810

Description description	Phosphoribosylaminoimidazole-succinocarboxamide synthase
Molecular weight formula_weight	26508.1 kDa
EC 编号 ec_number	6.3.2.6
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	3583

Structural Genomics, Protein TM1243, (SAICAR synthetase)

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

Phosphoribosylaminoimidazole-succinocarboxamide synthase

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

1kut__assembly_1__model_1

1kut__assembly_1__model_1 | I(q)

1kut__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) 6 domains

SCOP 2.08 (2 domains)

CATH v4.4 (4 domains)

7. Citations (1)

Source organism organism	Thermotoga maritima
NCBI taxonomy ID ncbi_taxonomy_id	2336
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	81

Structural Genomics, Protein TM1243, (SAICAR synthetase)

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

Phosphoribosylaminoimidazole-succinocarboxamide synthase

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

1kut__assembly_1__model_1

1kut__assembly_1__model_1 | I(q)

1kut__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) 6 domains

SCOP 2.08 (2 domains)

CATH v4.4 (4 domains)

7. Citations (1)