SAXSdb — 3siu

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

NHP2-like protein 1

Homo sapiens

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein–RNA	Heteromer	Protein 2 RNA 1	U4/U6 small nuclear ribonucleoprotein Prp31 × 1 （Q8WWY3） U4atac snRNA × 1 SULFATE ION × 1 water × 3	Consistent with all polymers
2	Protein–RNA	Heteromer	Protein 2 RNA 1	U4/U6 small nuclear ribonucleoprotein Prp31 × 1 （Q8WWY3） U4atac snRNA × 1 SULFATE ION × 1 water × 3	Consistent with all polymers

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	NH2L1_HUMAN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 3–130； UniProt 1–128 Author chain D； PDBConstruct 3–130； UniProt 1–128

U4/U6 small nuclear ribonucleoprotein Prp31

Homo sapiens

UniProt Q8WWY3

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein–RNA	Heteromer	Protein 2 RNA 1	NHP2-like protein 1 × 1 （P55769） U4atac snRNA × 1 SULFATE ION × 1 water × 3	Consistent with all polymers
2	Protein–RNA	Heteromer	Protein 2 RNA 1	NHP2-like protein 1 × 1 （P55769） U4atac snRNA × 1 SULFATE ION × 1 water × 3	Consistent with all polymers

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PRP31_HUMAN
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain B； PDBConstruct 6–254； UniProt 85–333 Author chain E； PDBConstruct 6–254； UniProt 85–333

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	3siu
Deposition date deposition_date	2011-06-20
Structure title title	Structure of a hPrp31-15.5K-U4atac 5' stem loop complex, monomeric form
Keywords keywords	;Major and minor spliceosome, RNA-protein complex, U4 snRNP and U4atac snRNP, RNA-binding protein, pre-mRNA splicing, U4 snRNA, nucleus, SPLICING-RNA complex ;; SPLICING/RNA
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.

3siu__assembly_1__model_1

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

Download this curve (.dat)

3siu__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

3siu__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	28.17 Å
Rg (electron density)	28.58 Å
Total Rg	28.89 Å
Atom count	3417
Residues	388
Excluded volume	58914 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3siu__assembly_1__model_1`	trimeric （3）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`3siu__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 (5)

Entity 1 Entity 1 polymer

Description description	NHP2-like protein 1
Molecular weight formula_weight	14335.7 kDa
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,D
Atom count atom_count	6896

GSMTEADVNPKAYPLADAHLTKKLLDLVQQSCNYKQLRKGANEATKTLNRGISEFIVMAADAEPLEIILHLPLLCEDKNVPYVFVRSKQALGRACGVSRPVIACSVTIKEGSQLKQQIQSIQQSIERLLV

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 polymer

Description description	U4/U6 small nuclear ribonucleoprotein Prp31
Molecular weight formula_weight	28268.2 kDa
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	B,E

GPLGSEAAPEYRVIVDANNLTVEIENELNIIHKFIRDKYSKRFPELESLVPNALDYIRTVKELGNSLDKCKNNENLQQILTNATIMVVSVTASTTQGQQLSEEELERLEEACDMALELNASKHRIYEYVESRMSFIAPNLSIIIGASTAAKIMGVAGGLTNLSKMPACNIMLLGAQRKTLSGFSSTSVLPHTGYIYHSDIVQSLPPDLRRKAARLVAAKCTLAARVDSFHESTEGKVGYELKDEIERKFDKWQE

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 3 Entity 3 polymer

Description description	U4atac snRNA
Molecular weight formula_weight	9073.5 kDa
Source method src_method	syn
Copy count entity_count	2

Polymer Polymer

Polymer type type	polyribonucleotide
Chain IDs strand_id	C,F

CUGUCCAAUGAGCGCAUAGUGAGGGCAG

Entity 4 Entity 4 non-polymer

Description description	SULFATE ION
Molecular weight formula_weight	96.1 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	57

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6. Fold Classification (SCOP + CATH) 6 domains

CATH v4.4 (6 domains)

Domain ID domain_id	3siuA00
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	1330 — 60s Ribosomal Protein L30; Chain: A;
Homologous superfamily homologous superfamily	30 — Ribosomal protein L30/S12

Domain ID domain_id	3siuB01
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	287 — Helix Hairpins
Homologous superfamily homologous superfamily	4070 —

Domain ID domain_id	3siuB02
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	246 — Serum Albumin; Chain A, Domain 1
Homologous superfamily homologous superfamily	90 — Nop domain

Domain ID domain_id	3siuD00
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	1330 — 60s Ribosomal Protein L30; Chain: A;
Homologous superfamily homologous superfamily	30 — Ribosomal protein L30/S12

Domain ID domain_id	3siuE01
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	287 — Helix Hairpins
Homologous superfamily homologous superfamily	4070 —

Domain ID domain_id	3siuE02
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	246 — Serum Albumin; Chain A, Domain 1
Homologous superfamily homologous superfamily	90 — Nop domain

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Unit-cell length a length_a	49.499 Å
Unit-cell length b length_b	111.263 Å
Unit-cell length c length_c	110.858 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	101.81 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	4

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

Resolution resolution	2.626 Å
Low-resolution limit resolution_low	29.450 Å
R factor r_factor	0.2004
R_work r_work	0.1982
R_free r_free	0.2413

Structure of a hPrp31-15.5K-U4atac 5' stem loop complex, monomeric form

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

NHP2-like protein 1

State in the Current Structure

Other States of the Same Protein in the Database

U4/U6 small nuclear ribonucleoprotein Prp31

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

3siu__assembly_1__model_1

3siu__assembly_1__model_1 | I(q)

3siu__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 polymer

Polymer Polymer

Source Source

Entity 3 Entity 3 polymer

Polymer Polymer

Entity 4 Entity 4 non-polymer

Entity 5 Entity 5 water

6. Fold Classification (SCOP + CATH) 6 domains

CATH v4.4 (6 domains)

7. Citations (1)

Structure of a hPrp31-15.5K-U4atac 5' stem loop complex, monomeric form

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

NHP2-like protein 1

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

U4/U6 small nuclear ribonucleoprotein Prp31

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

3siu__assembly_1__model_1

3siu__assembly_1__model_1 | I(q)

3siu__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 polymer

Polymer Polymer

Source Source

Entity 3 Entity 3 polymer

Polymer Polymer

Entity 4 Entity 4 non-polymer

Entity 5 Entity 5 water

6. Fold Classification (SCOP + CATH) 6 domains

CATH v4.4 (6 domains)

7. Citations (1)