4ece

Crystal structure of purine nucleoside phosphorylase (W16Y, W94Y, W178Y, H257W) mutant from human complexed with guanine

Method: X-RAY DIFFRACTION

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

Purine nucleoside phosphorylase

Homo sapiens

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 3	GUANINE × 3 water × 3	Consistent with protein count
2	Protein homooligomer	Homooligomer	Protein 3	GUANINE × 3 water × 3	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PNPH_HUMAN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 36–324； UniProt 1–289 Author chain B； PDBConstruct 36–324； UniProt 1–289 Author chain C； PDBConstruct 36–324； UniProt 1–289 Author chain D； PDBConstruct 36–324； UniProt 1–289 Author chain E； PDBConstruct 36–324； UniProt 1–289 Author chain F； PDBConstruct 36–324； UniProt 1–289

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	4ece
Deposition date deposition_date	2012-03-26
Structure title title	Crystal structure of purine nucleoside phosphorylase (W16Y, W94Y, W178Y, H257W) mutant from human complexed with guanine
Keywords keywords	;TRANSFERASE, PNP, guanine, Purine nucleoside phosphorylase, nucleoside binding, purine base binding, purine-nucleoside phosphorylase activity, drug binding, transferring glycosyl groups, phosphate ion binding, intracellular, cytosol ;; 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.

4ece__assembly_2__model_1

Assembly 2 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

4ece__assembly_2__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

4ece__assembly_2__model_1 | P(r) · Pending

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

Rg（Guinier）	29.38 Å
Rg (electron density)	28.39 Å
Total Rg	29.18 Å
Atom count	6642
Residues	846
Excluded volume	118240 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`4ece__assembly_1__model_1`	trimeric （3）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`4ece__assembly_2__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 (3)

Entity 1 Entity 1 polymer

Description description	Purine nucleoside phosphorylase
Molecular weight formula_weight	36127.1 kDa
EC 编号 ec_number	2.4.2.1
Mutation mutation	W16Y, W94Y, W178Y, H257W
Source method src_method	man
Copy count entity_count	6

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C,D,E,F
Atom count atom_count	13632

MRGSHHHHHHGMASMTGGQQMGRDLYDDDDKDPTLMENGYTYEDYKNTAEYLLSHTKHRPQVAIICGSGLGGLTDKLTQAQIFDYSEIPNFPRSTVPGHAGRLVFGFLNGRACVMMQGRFHMYEGYPLYKVTFPVRVFHLLGVDTLVVTNAAGGLNPKFEVGDIMLIRDHINLPGFSGQNPLRGPNDERFGDRFPAMSDAYDRTMRQRALSTYKQMGEQRELQEGTYVMVAGPSFETVAECRVLQKLGADAVGMSTVPEVIVARHCGLRVFGFSLITNKVIMDYESLEKANWEEVLAAGKQAAQKLEQFVSILMASIPLPDKAS

Source Source

Source organism organism	Homo sapiens
Common name common_name	human
NCBI taxonomy ID ncbi_taxonomy_id	9606
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 non-polymer

Description description	GUANINE
Molecular weight formula_weight	151.1 kDa
Source method src_method	syn
Copy count entity_count	6

Entity 3 Entity 3 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	305

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6. Fold Classification (SCOP + CATH) 12 domains

SCOP 2.08 (6 domains)

Domain ID domain_id	d4ecea_
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	d4eceb_
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	d4ecec_
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	d4eced_
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	d4ecee_
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	d4ecef_
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 (6 domains)

Domain ID domain_id	4eceA00
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	4eceB00
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	4eceC00
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	4eceD00
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	4eceE00
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	4eceF00
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	77.553 Å
Unit-cell length b length_b	129.676 Å
Unit-cell length c length_c	104.346 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	105.29 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	12

Space group space_group	P 1 21 1
Space-group number int_tables_number	4
Crystal system crystal_system	—

Resolution resolution	2.600 Å
Low-resolution limit resolution_low	49.040 Å
R factor r_factor	0.2235
R_work r_work	0.2215
R_free r_free	0.2610

Crystal structure of purine nucleoside phosphorylase (W16Y, W94Y, W178Y, H257W) mutant from human complexed with guanine

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

Purine nucleoside phosphorylase

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

4ece__assembly_2__model_1

4ece__assembly_2__model_1 | I(q)

4ece__assembly_2__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 (3)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 12 domains

SCOP 2.08 (6 domains)

CATH v4.4 (6 domains)

7. Citations (1)

Crystal structure of purine nucleoside phosphorylase (W16Y, W94Y, W178Y, H257W) mutant from human complexed with guanine

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

Purine nucleoside phosphorylase

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

4ece__assembly_2__model_1

4ece__assembly_2__model_1 | I(q)

4ece__assembly_2__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 (3)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 12 domains

SCOP 2.08 (6 domains)

CATH v4.4 (6 domains)

7. Citations (1)