SAXSdb — 1g9s

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

HYPOXANTHINE PHOSPHORIBOSYLTRANSFERASE

Escherichia coli

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 4	INOSINIC ACID × 2 ;ANY 5'-MONOPHOSPHATE NUCLEOTIDE ; × 2 water × 4	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	HPRT_ECOLI
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–182； UniProt 1–182 Author chain B； PDBConstruct 1–182； UniProt 1–182

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	1g9s
Deposition date deposition_date	2000-11-27
Structure title title	CRYSTAL STRUCTURE OF A COMPLEX BETWEEN E.COLI HPRT AND IMP
Keywords keywords	phosphoribosyltransferases, purine salvage, protein chemistry, enzymology, 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.

1g9s__assembly_1__model_1

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

Download this curve (.dat)

1g9s__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1g9s__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	27.57 Å
Rg (electron density)	26.58 Å
Total Rg	27.35 Å
Atom count	5408
Residues	676
Excluded volume	97048 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1g9s__assembly_1__model_1`	tetrameric （4）	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 (4)

Entity 1 Entity 1 polymer

Description description	HYPOXANTHINE PHOSPHORIBOSYLTRANSFERASE
Molecular weight formula_weight	20657.9 kDa
EC 编号 ec_number	2.4.2.8
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	2800

MVRDMKHTVEVMIPEAEIKARIAELGRQITERYKDSGSDMVLVGLLRGSFMFMADLCREVQVSHEVDFMTASSYGSGMSTTRDLKILKDLDEDIRGKDVLIVEDIIDSGNTLSKVREILSLREPKSLAICTLLDKPSRREVNVPVEFIGFSIPDEFVVGYGIDYAQRYRHLPYIGKVILLDE

Source Source

Source organism organism	Escherichia coli
NCBI taxonomy ID ncbi_taxonomy_id	562
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 non-polymer

Description description	INOSINIC ACID
Molecular weight formula_weight	348.2 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 3 Entity 3 non-polymer

Description description	;ANY 5'-MONOPHOSPHATE NUCLEOTIDE ;
Molecular weight formula_weight	214.1 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 4 Entity 4 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	96

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6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d1g9sa_
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.61.1.1 — Phosphoribosyltransferases (PRTases)

Domain ID domain_id	d1g9sb_
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.61.1.1 — Phosphoribosyltransferases (PRTases)

CATH v4.4 (2 domains)

Domain ID domain_id	1g9sA00
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	1g9sB00
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	84.140 Å
Unit-cell length b length_b	84.140 Å
Unit-cell length c length_c	167.270 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 31 2 1
Space-group number int_tables_number	152
Crystal system crystal_system	—

Resolution resolution	2.800 Å
Low-resolution limit resolution_low	50.000 Å
R factor r_factor	0.2010
R_work r_work	0.2010
R_free r_free	0.2430

CRYSTAL STRUCTURE OF A COMPLEX BETWEEN E.COLI HPRT AND IMP

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

HYPOXANTHINE PHOSPHORIBOSYLTRANSFERASE

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

1g9s__assembly_1__model_1

1g9s__assembly_1__model_1 | I(q)

1g9s__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 (4)

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 water

6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)

CRYSTAL STRUCTURE OF A COMPLEX BETWEEN E.COLI HPRT AND IMP

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

HYPOXANTHINE PHOSPHORIBOSYLTRANSFERASE

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

1g9s__assembly_1__model_1

1g9s__assembly_1__model_1 | I(q)

1g9s__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 (4)

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 water

6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)