SAXSdb — 1c3x

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

PENTOSYLTRANSFERASE

OrganismNot specified

UniProt P81989

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 3	PHOSPHATE ION × 3 8-IODO-GUANINE × 3 CALCIUM ION × 1 water × 3	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PUNA_CELSP
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–266； UniProt 9–282 Author chain B； PDBConstruct 1–266； UniProt 9–282 Author chain C； PDBConstruct 1–266； UniProt 9–282

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	1c3x
Deposition date deposition_date	1999-07-29
Structure title title	PURINE NUCLEOSIDE PHOSPHORYLASE FROM CELLULOMONAS SP. IN COMPLEX WITH 8-IODO-GUANINE
Keywords keywords	ENZYME, PURINE NUCLEOSIDE PHOSPHORYLASE, 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.

1c3x__assembly_1__model_1

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

Download this curve (.dat)

1c3x__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1c3x__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	29.17 Å
Rg (electron density)	28.22 Å
Total Rg	28.88 Å
Atom count	5866
Residues	798
Excluded volume	103560 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1c3x__assembly_1__model_1`	trimeric （3）	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	PENTOSYLTRANSFERASE
Molecular weight formula_weight	27546.2 kDa
Source method src_method	nat
Copy count entity_count	3

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C
Atom count atom_count	6133

PPLDDPATDPFLVARAAADHIAQATGVEGHDMALVLGSGWGGAAELLGEVVAEVPTHEIPGFSSVTRSIRVERADGSVRHALVLGSRTHLYEGKGVRAVVHGVRTAAATGAETLILTNGCGGLNQEWGAGTPVLLSDHINLTARSPLEGPTFVDLTDVYSPRLRELAHRVDPTLPEGVYAQFPGPHYETPAEVRMAGILGADLVGMSTTLEAIAARHCGLEVLGVSLVTNLAAGISPTPLSHAEVIEAGQAAGPRISALLADIAKR

Entity 2 Entity 2 non-polymer

Description description	PHOSPHATE ION
Molecular weight formula_weight	95.0 kDa
Source method src_method	syn
Copy count entity_count	3

Entity 3 Entity 3 non-polymer

Description description	8-IODO-GUANINE
Molecular weight formula_weight	277.0 kDa
Source method src_method	syn
Copy count entity_count	3

Entity 4 Entity 4 non-polymer

Description description	CALCIUM ION
Molecular weight formula_weight	40.1 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 5 Entity 5 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	267

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6. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (3 domains)

Domain ID domain_id	d1c3xa_
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.56 — Phosphorylase/hydrolase-like
Superfamily Superfamily superfamily	c.56.2 — Purine and uridine phosphorylases
Family Family family	c.56.2.1 — Purine and uridine phosphorylases

Domain ID domain_id	d1c3xb_
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.56 — Phosphorylase/hydrolase-like
Superfamily Superfamily superfamily	c.56.2 — Purine and uridine phosphorylases
Family Family family	c.56.2.1 — Purine and uridine phosphorylases

Domain ID domain_id	d1c3xc_
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.56 — Phosphorylase/hydrolase-like
Superfamily Superfamily superfamily	c.56.2 — Purine and uridine phosphorylases
Family Family family	c.56.2.1 — Purine and uridine phosphorylases

CATH v4.4 (3 domains)

Domain ID domain_id	1c3xA00
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	1580 — Nucleoside phosphorylase domain

Domain ID domain_id	1c3xB00
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	1580 — Nucleoside phosphorylase domain

Domain ID domain_id	1c3xC00
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	1580 — Nucleoside phosphorylase domain

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Unit-cell length a length_a	63.319 Å
Unit-cell length b length_b	108.340 Å
Unit-cell length c length_c	117.562 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	12

Space group space_group	P 21 21 21
Space-group number int_tables_number	19
Crystal system crystal_system	—

Resolution resolution	2.400 Å
Low-resolution limit resolution_low	44.000 Å
R factor r_factor	0.2000
R_work r_work	0.2000
R_free r_free	0.2510

PURINE NUCLEOSIDE PHOSPHORYLASE FROM CELLULOMONAS SP. IN COMPLEX WITH 8-IODO-GUANINE

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

PENTOSYLTRANSFERASE

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

1c3x__assembly_1__model_1

1c3x__assembly_1__model_1 | I(q)

1c3x__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

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) 6 domains

SCOP 2.08 (3 domains)

CATH v4.4 (3 domains)

7. Citations (1)

PURINE NUCLEOSIDE PHOSPHORYLASE FROM CELLULOMONAS SP. IN COMPLEX WITH 8-IODO-GUANINE

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

PENTOSYLTRANSFERASE

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

1c3x__assembly_1__model_1

1c3x__assembly_1__model_1 | I(q)

1c3x__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

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) 6 domains

SCOP 2.08 (3 domains)

CATH v4.4 (3 domains)

7. Citations (1)