SAXSdb — 1ibs

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

RIBOSE-PHOSPHATE PYROPHOSPHOKINASE

Bacillus subtilis

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 6	SULFATE ION × 12 CADMIUM ION × 12 METHYL PHOSPHONIC ACID ADENOSINE ESTER × 6 water × 6	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	KPRS_BACSU
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–317； UniProt 1–317 Author chain B； PDBConstruct 1–317； UniProt 1–317

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	1ibs
Deposition date deposition_date	2001-03-29
Structure title title	PHOSPHORIBOSYLDIPHOSPHATE SYNTHETASE IN COMPLEX WITH CADMIUM IONS
Keywords keywords	Open alpha beta structure, Domain duplication, Phosphoribosyltransferase type I fold, TRANSFERASE; TRANSFERASE
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.

1ibs__assembly_1__model_1

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

Download this curve (.dat)

1ibs__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1ibs__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	37.78 Å
Rg (electron density)	37.12 Å
Total Rg	37.51 Å
Atom count	14001
Residues	1788
Excluded volume	251620 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1ibs__assembly_1__model_1`	hexameric （6）	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 (5)

Entity 1 Entity 1 polymer

Description description	RIBOSE-PHOSPHATE PYROPHOSPHOKINASE
Molecular weight formula_weight	34910.2 kDa
EC 编号 ec_number	2.7.6.1
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B
Atom count atom_count	4714

MSNQYGDKNLKIFSLNSNPELAKEIADIVGVQLGKCSVTRFSDGEVQINIEESIRGCDCYIIQSTSDPVNEHIMELLIMVDALKRASAKTINIVIPYYGYARQDRKARSREPITAKLFANLLETAGATRVIALDLHAPQIQGFFDIPIDHLMGVPILGEYFEGKNLEDIVIVSPDHGGVTRARKLADRLKAPIAIIDKRRPRPNVAEVMNIVGNIEGKTAILIDDIIDTAGTITLAANALVENGAKEVYACCTHPVLSGPAVERINNSTIKELVVTNSIKLPEEKKIERFKQLSVGPLLAEAIIRVHEQQSVSYLFS

Source Source

Source organism organism	Bacillus subtilis
NCBI taxonomy ID ncbi_taxonomy_id	1423
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 non-polymer

Description description	SULFATE ION
Molecular weight formula_weight	96.1 kDa
Source method src_method	syn
Copy count entity_count	4

Entity 3 Entity 3 non-polymer

Description description	CADMIUM ION
Molecular weight formula_weight	112.4 kDa
Source method src_method	syn
Copy count entity_count	4

Entity 4 Entity 4 non-polymer

Description description	METHYL PHOSPHONIC ACID ADENOSINE ESTER
Molecular weight formula_weight	345.2 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 5 Entity 5 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	47

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6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

Domain ID domain_id	d1ibsa1
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.61 — PRTase-like
Superfamily Superfamily superfamily	c.61.1 — PRTase-like
Family Family family	c.61.1.2 — Phosphoribosylpyrophosphate synthetase-like

Domain ID domain_id	d1ibsa2
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.61 — PRTase-like
Superfamily Superfamily superfamily	c.61.1 — PRTase-like
Family Family family	c.61.1.2 — Phosphoribosylpyrophosphate synthetase-like

Domain ID domain_id	d1ibsb1
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.61 — PRTase-like
Superfamily Superfamily superfamily	c.61.1 — PRTase-like
Family Family family	c.61.1.2 — Phosphoribosylpyrophosphate synthetase-like

Domain ID domain_id	d1ibsb2
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.61 — PRTase-like
Superfamily Superfamily superfamily	c.61.1 — PRTase-like
Family Family family	c.61.1.2 — Phosphoribosylpyrophosphate synthetase-like

CATH v4.4 (4 domains)

Domain ID domain_id	1ibsA01
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	2020 —

Domain ID domain_id	1ibsA02
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	2020 —

Domain ID domain_id	1ibsB01
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	2020 —

Domain ID domain_id	1ibsB02
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	2020 —

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Unit-cell length a length_a	115.600 Å
Unit-cell length b length_b	115.600 Å
Unit-cell length c length_c	107.670 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.00 °
Unit-cell angle γ angle_gamma	120.00 °
Molecules per unit cell Z z_pdb	12

Space group space_group	P 63
Space-group number int_tables_number	173
Crystal system crystal_system	—

Resolution resolution	2.800 Å
Low-resolution limit resolution_low	30.000 Å
R factor r_factor	0.2000
R_work r_work	0.2000
R_free r_free	0.2730

PHOSPHORIBOSYLDIPHOSPHATE SYNTHETASE IN COMPLEX WITH CADMIUM IONS

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

RIBOSE-PHOSPHATE PYROPHOSPHOKINASE

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

1ibs__assembly_1__model_1

1ibs__assembly_1__model_1 | I(q)

1ibs__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 (5)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 non-polymer

Entity 5 Entity 5 water

6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (1)

PHOSPHORIBOSYLDIPHOSPHATE SYNTHETASE IN COMPLEX WITH CADMIUM IONS

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

RIBOSE-PHOSPHATE PYROPHOSPHOKINASE

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

1ibs__assembly_1__model_1

1ibs__assembly_1__model_1 | I(q)

1ibs__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 (5)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 non-polymer

Entity 5 Entity 5 water

6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (1)