SAXSdb — 1u20

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

U8 snoRNA-binding protein X29

Xenopus laevis

State in the Current Structure

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

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	Q6TEC1_XENLA
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–212； UniProt 1–212 Author chain B； PDBConstruct 1–212； UniProt 1–212

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	1u20
Deposition date deposition_date	2004-07-16
Structure title title	Crystal Structure of Xenopus laevis nudix hydrolase nuclear SnoRNA decapping Protein X29
Keywords keywords	modified Nudix hydrolase fold, HYDROLASE; HYDROLASE
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.

1u20__assembly_1__model_1

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

Download this curve (.dat)

1u20__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1u20__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	22.88 Å
Rg (electron density)	21.51 Å
Total Rg	22.36 Å
Atom count	3048
Residues	388
Excluded volume	54135 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1u20__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 (3)

Entity 1 Entity 1 polymer

Description description	U8 snoRNA-binding protein X29
Molecular weight formula_weight	24390.0 kDa
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	3274

MAESRSPDRGAKEDKPRPRNISREESLQLEGYKHACHALLHAPSQAKLFDRVPIRRVLLMMMRFDGRLGFPGGFVDTRDISLEEGLKRELEEELGPALATVEVTEDDYRSSQVREHPQKCVTHFYIKELKLEEIERIEAEAVNAKDHGLEVMGLIRVPLYTLRDRVGGLPAFLCNNFIGNSKSQLLYALRSLKLLREDQIQEVLKASHRLQY

Source Source

Source organism organism	Xenopus laevis
Common name common_name	African clawed frog
NCBI taxonomy ID ncbi_taxonomy_id	8355
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 non-polymer

Description description	GLYCEROL
Molecular weight formula_weight	92.1 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 3 Entity 3 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	186

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6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d1u20a1
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.113 — Nudix
Superfamily Superfamily superfamily	d.113.1 — Nudix
Family Family family	d.113.1.1 — MutT-like

Domain ID domain_id	d1u20b_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.113 — Nudix
Superfamily Superfamily superfamily	d.113.1 — Nudix
Family Family family	d.113.1.1 — MutT-like

CATH v4.4 (2 domains)

Domain ID domain_id	1u20A00
Class class	3 — Alpha Beta
Architecture architecture	90 — Alpha-Beta Complex
Topology topology	79 — Nucleoside Triphosphate Pyrophosphohydrolase
Homologous superfamily homologous superfamily	10 — Nucleoside Triphosphate Pyrophosphohydrolase

Domain ID domain_id	1u20B00
Class class	3 — Alpha Beta
Architecture architecture	90 — Alpha-Beta Complex
Topology topology	79 — Nucleoside Triphosphate Pyrophosphohydrolase
Homologous superfamily homologous superfamily	10 — Nucleoside Triphosphate Pyrophosphohydrolase

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Unit-cell length a length_a	49.188 Å
Unit-cell length b length_b	82.990 Å
Unit-cell length c length_c	111.063 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 21 21 21
Space-group number int_tables_number	19
Crystal system crystal_system	—

Resolution resolution	2.100 Å
Low-resolution limit resolution_low	26.900 Å
R factor r_factor	0.2088
R_work r_work	0.2040
R_free r_free	0.2542

Crystal Structure of Xenopus laevis nudix hydrolase nuclear SnoRNA decapping Protein X29

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

U8 snoRNA-binding protein X29

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

1u20__assembly_1__model_1

1u20__assembly_1__model_1 | I(q)

1u20__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 (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) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)

Crystal Structure of Xenopus laevis nudix hydrolase nuclear SnoRNA decapping Protein X29

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

U8 snoRNA-binding protein X29

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

1u20__assembly_1__model_1

1u20__assembly_1__model_1 | I(q)

1u20__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 (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) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)