SAXSdb — 2btu

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

PHOSPHORIBOSYL-AMINOIMIDAZOLE SYNTHETASE

BACILLUS ANTHRACIS

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	PUR5_BACAN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–346； UniProt 1–346 Author chain B； PDBConstruct 1–346； UniProt 1–346

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	2btu
Deposition date deposition_date	2005-06-07
Structure title title	Crystal structure of Phosphoribosylformylglycinamidine cyclo-ligase from Bacillus Anthracis at 2.3A resolution.
Keywords keywords	;SYNTHASE, PURM, DE NOVO PURINE BIOSYNTHESIS, AIR SYNTHASE FAMILY, SPINE, SYNTHETASE, FGAR AMIDOTRANSFERASE, NOVEL FOLD, STRUCTURAL PROTEOMICS IN EUROPE, STRUCTURAL GENOMICS ;; SYNTHASE
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.

2btu__assembly_1__model_1

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

Download this curve (.dat)

2btu__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

2btu__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	26.53 Å
Rg (electron density)	25.84 Å
Total Rg	26.58 Å
Atom count	4418
Residues	629
Excluded volume	79068 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`2btu__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	d2btua1
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.79 — Bacillus chorismate mutase-like
Superfamily Superfamily superfamily	d.79.4 — PurM N-terminal domain-like
Family Family family	d.79.4.0 — automated matches

Domain ID domain_id	d2btua2
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.139 — PurM C-terminal domain-like
Superfamily Superfamily superfamily	d.139.1 — PurM C-terminal domain-like
Family Family family	d.139.1.0 — automated matches

Domain ID domain_id	d2btub1
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.79 — Bacillus chorismate mutase-like
Superfamily Superfamily superfamily	d.79.4 — PurM N-terminal domain-like
Family Family family	d.79.4.0 — automated matches

Domain ID domain_id	d2btub2
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.139 — PurM C-terminal domain-like
Superfamily Superfamily superfamily	d.139.1 — PurM C-terminal domain-like
Family Family family	d.139.1.0 — automated matches

CATH v4.4 (4 domains)

Domain ID domain_id	2btuA01
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	1330 — 60s Ribosomal Protein L30; Chain: A;
Homologous superfamily homologous superfamily	10 — PurM-like, N-terminal domain

Domain ID domain_id	2btuA02
Class class	3 — Alpha Beta
Architecture architecture	90 — Alpha-Beta Complex
Topology topology	650 — Phosphoribosyl-aminoimidazole Synthetase; Chain A, domain 2
Homologous superfamily homologous superfamily	10 — PurM-like C-terminal domain

Domain ID domain_id	2btuB01
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	1330 — 60s Ribosomal Protein L30; Chain: A;
Homologous superfamily homologous superfamily	10 — PurM-like, N-terminal domain

Domain ID domain_id	2btuB02
Class class	3 — Alpha Beta
Architecture architecture	90 — Alpha-Beta Complex
Topology topology	650 — Phosphoribosyl-aminoimidazole Synthetase; Chain A, domain 2
Homologous superfamily homologous superfamily	10 — PurM-like C-terminal domain

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Unit-cell length a length_a	89.490 Å
Unit-cell length b length_b	89.490 Å
Unit-cell length c length_c	88.117 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	8

Space group space_group	P 41
Space-group number int_tables_number	76
Crystal system crystal_system	—

Resolution resolution	2.310 Å
Low-resolution limit resolution_low	25.000 Å
R factor r_factor	—
R_work r_work	—
R_free r_free	0.2491

Description description	PHOSPHORIBOSYL-AMINOIMIDAZOLE SYNTHETASE
Molecular weight formula_weight	37297.2 kDa
EC 编号 ec_number	6.3.3.1
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	4584

Crystal structure of Phosphoribosylformylglycinamidine cyclo-ligase from Bacillus Anthracis at 2.3A resolution.

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

PHOSPHORIBOSYL-AMINOIMIDAZOLE SYNTHETASE

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

2btu__assembly_1__model_1

2btu__assembly_1__model_1 | I(q)

2btu__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) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (1)

Source organism organism	BACILLUS ANTHRACIS
NCBI taxonomy ID ncbi_taxonomy_id	1392
Host organism host_organism	ESCHERICHIA COLI

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	166

Crystal structure of Phosphoribosylformylglycinamidine cyclo-ligase from Bacillus Anthracis at 2.3A resolution.

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

PHOSPHORIBOSYL-AMINOIMIDAZOLE SYNTHETASE

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

2btu__assembly_1__model_1

2btu__assembly_1__model_1 | I(q)

2btu__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) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (1)