1s32

Molecular Recognition of the Nucleosomal 'Supergroove'

Method: X-RAY DIFFRACTION

▼

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

Histone H3

Xenopus laevis

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein–DNA	Heteromer	Protein 8 DNA 2	palindromic alpha-satellite 146 bp DNA fragment × 2 Histone H4 × 2 （A0A8J1LTD2） Histone H2A × 2 （Q6AZJ8） Histone H2B × 2 （A0A8J0U496） MANGANESE (II) ION × 14 4-AMINO-(1-METHYLIMIDAZOLE)-2-CARBOXYLIC ACID × 4 4-AMINO-(1-METHYLPYRROLE)-2-CARBOXYLIC ACID × 12 GAMMA-AMINO-BUTANOIC ACID × 2 BETA-ALANINE × 2 3-AMINO-(DIMETHYLPROPYLAMINE) × 2 2-(2-CARBAMOYLMETHOXY-ETHOXY)-ACETAMIDE × 1 CHLORIDE ION × 4 water × 10	Consistent with all polymers

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	A0A310TTQ1_XENLA
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain A； PDBConstruct 1–135； UniProt 2–136 Author chain E； PDBConstruct 1–135； UniProt 2–136

Histone H4

Xenopus laevis

UniProt A0A8J1LTD2

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein–DNA	Heteromer	Protein 8 DNA 2	palindromic alpha-satellite 146 bp DNA fragment × 2 Histone H3 × 2 （A0A310TTQ1） Histone H2A × 2 （Q6AZJ8） Histone H2B × 2 （A0A8J0U496） MANGANESE (II) ION × 14 4-AMINO-(1-METHYLIMIDAZOLE)-2-CARBOXYLIC ACID × 4 4-AMINO-(1-METHYLPYRROLE)-2-CARBOXYLIC ACID × 12 GAMMA-AMINO-BUTANOIC ACID × 2 BETA-ALANINE × 2 3-AMINO-(DIMETHYLPROPYLAMINE) × 2 2-(2-CARBAMOYLMETHOXY-ETHOXY)-ACETAMIDE × 1 CHLORIDE ION × 4 water × 10	Consistent with all polymers

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	A0A8J1LTD2_XENLA
Isoform	—
PDB entities	3
Chains and sequence ranges	Author chain B； PDBConstruct 1–102； UniProt 15–116 Author chain F； PDBConstruct 1–102； UniProt 15–116

Histone H2A

Xenopus laevis

UniProt Q6AZJ8

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein–DNA	Heteromer	Protein 8 DNA 2	palindromic alpha-satellite 146 bp DNA fragment × 2 Histone H3 × 2 （A0A310TTQ1） Histone H4 × 2 （A0A8J1LTD2） Histone H2B × 2 （A0A8J0U496） MANGANESE (II) ION × 14 4-AMINO-(1-METHYLIMIDAZOLE)-2-CARBOXYLIC ACID × 4 4-AMINO-(1-METHYLPYRROLE)-2-CARBOXYLIC ACID × 12 GAMMA-AMINO-BUTANOIC ACID × 2 BETA-ALANINE × 2 3-AMINO-(DIMETHYLPROPYLAMINE) × 2 2-(2-CARBAMOYLMETHOXY-ETHOXY)-ACETAMIDE × 1 CHLORIDE ION × 4 water × 10	Consistent with all polymers

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	Q6AZJ8_XENLA
Isoform	—
PDB entities	4
Chains and sequence ranges	Author chain C； PDBConstruct 1–119； UniProt 2–120 Author chain G； PDBConstruct 1–119； UniProt 2–120

Histone H2B

Xenopus laevis

UniProt A0A8J0U496

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein–DNA	Heteromer	Protein 8 DNA 2	palindromic alpha-satellite 146 bp DNA fragment × 2 Histone H3 × 2 （A0A310TTQ1） Histone H4 × 2 （A0A8J1LTD2） Histone H2A × 2 （Q6AZJ8） MANGANESE (II) ION × 14 4-AMINO-(1-METHYLIMIDAZOLE)-2-CARBOXYLIC ACID × 4 4-AMINO-(1-METHYLPYRROLE)-2-CARBOXYLIC ACID × 12 GAMMA-AMINO-BUTANOIC ACID × 2 BETA-ALANINE × 2 3-AMINO-(DIMETHYLPROPYLAMINE) × 2 2-(2-CARBAMOYLMETHOXY-ETHOXY)-ACETAMIDE × 1 CHLORIDE ION × 4 water × 10	Consistent with all polymers

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	A0A8J0U496_XENLA
Isoform	—
PDB entities	5
Chains and sequence ranges	Author chain D； PDBConstruct 1–122； UniProt 5–126 Author chain H； PDBConstruct 1–122； UniProt 5–126

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.

▼

2. Structure Basics 2. Structure Basics

Entry ID entry_id	1s32
Deposition date deposition_date	2004-01-12
Structure title title	Molecular Recognition of the Nucleosomal 'Supergroove'
Keywords keywords	;Nucleosome Core Particle (NCP), Pyrrole-Imidazole (Py-Im) hairpin polyamide, clamp, nucleosome dynamics, STRUCTURAL PROTEIN-DNA COMPLEX ;; STRUCTURAL PROTEIN/DNA
Experimental Method method	X-RAY DIFFRACTION

▼

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.

1s32__assembly_1__model_1

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

Download this curve (.dat)

1s32__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1s32__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	39.91 Å
Rg (electron density)	37.41 Å
Total Rg	38.11 Å
Atom count	12391
Residues	1071
Excluded volume	202540 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1s32__assembly_1__model_1`	decameric （10）	Success	4.1.3-1-20251215 (887e7ef)	View Download

▶

4. Crystallography and Experiment 4. Crystallography & Experiment

▶

5. Entities and Polymers Entities & Polymers (14)

Entity 1 Entity 1 polymer

Description description	palindromic alpha-satellite 146 bp DNA fragment
Molecular weight formula_weight	45054.8 kDa
Source method src_method	syn
Copy count entity_count	2

Polymer Polymer

Polymer type type	polydeoxyribonucleotide
Chain IDs strand_id	I,J
Atom count atom_count	13437

ATCAATATCCACCTGCAGATTCTACCAAAAGTGTATTTGGAAACTGCTCCATCAAAAGGCATGTTCAGCGGAATTCCGCTGAACATGCCTTTTGATGGAGCAGTTTCCAAATACACTTTTGGTAGAATCTGCAGGTGGATATTGAT

Entity 2 Entity 2 polymer

Description description	Histone H3
Molecular weight formula_weight	15303.9 kDa
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

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

ARTKQTARKSTGGKAPRKQLATKAARKSAPATGGVKKPHRYRPGTVALREIRRYQKSTELLIRKLPFQRLVREIAQDFKTDLRFQSSAVMALQEASEAYLVALFEDTNLCAIHAKRVTIMPKDIQLARRIRGERA

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 3 Entity 3 polymer

Description description	Histone H4
Molecular weight formula_weight	11263.2 kDa
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

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

SGRGKGGKGLGKGGAKRHRKVLRDNIQGITKPAIRRLARRGGVKRISGLIYEETRGVLKVFLENVIRDAVTYTEHAKRKTVTAMDVVYALKRQGRTLYGFGG

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 4 Entity 4 polymer

Description description	Histone H2A
Molecular weight formula_weight	12941.1 kDa
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	C,G

SGRGKQGGKTRAKAKTRSSRAGLQFPVGRVHRLLRKGNYAERVGAGAPVYLAAVLEYLTAEILELAGNAARDNKKTRIIPRHLQLAVRNDEELNKLLGRVTIAQGGVLPNIQSVLLPKK

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 5 Entity 5 polymer

Description description	Histone H2B
Molecular weight formula_weight	13524.8 kDa
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	D,H

AKSAPAPKKGSKKAVTKTQKKDGKKRRKTRKESYAIYVYKVLKQVHPDTGISSKAMSIMNSFVNDVFERIAGEASRLAHYNKRSTITSREIQTAVRLLLPGELAKHAVSEGTKAVTKYTSAK

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 6 Entity 6 non-polymer

Description description	MANGANESE (II) ION
Molecular weight formula_weight	54.9 kDa
Source method src_method	syn
Copy count entity_count	14

Entity 7 Entity 7 non-polymer

Description description	4-AMINO-(1-METHYLIMIDAZOLE)-2-CARBOXYLIC ACID
Molecular weight formula_weight	141.1 kDa
Source method src_method	syn
Copy count entity_count	4

Entity 8 Entity 8 non-polymer

Description description	4-AMINO-(1-METHYLPYRROLE)-2-CARBOXYLIC ACID
Molecular weight formula_weight	140.1 kDa
Source method src_method	syn
Copy count entity_count	12

Entity 9 Entity 9 non-polymer

Description description	GAMMA-AMINO-BUTANOIC ACID
Molecular weight formula_weight	103.1 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 10 Entity 10 non-polymer

Description description	BETA-ALANINE
Molecular weight formula_weight	89.1 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 11 Entity 11 non-polymer

Description description	3-AMINO-(DIMETHYLPROPYLAMINE)
Molecular weight formula_weight	102.2 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 12 Entity 12 non-polymer

Description description	2-(2-CARBAMOYLMETHOXY-ETHOXY)-ACETAMIDE
Molecular weight formula_weight	176.2 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 13 Entity 13 non-polymer

Description description	CHLORIDE ION
Molecular weight formula_weight	35.5 kDa
Source method src_method	syn
Copy count entity_count	4

Entity 14 Entity 14 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	888

▼

6. Fold Classification (SCOP + CATH) 16 domains

SCOP 2.08 (8 domains)

Domain ID domain_id	d1s32a_
Class class	a — All alpha proteins
Fold Fold fold	a.22 — Histone-fold
Superfamily Superfamily superfamily	a.22.1 — Histone-fold
Family Family family	a.22.1.1 — Nucleosome core histones

Domain ID domain_id	d1s32b_
Class class	a — All alpha proteins
Fold Fold fold	a.22 — Histone-fold
Superfamily Superfamily superfamily	a.22.1 — Histone-fold
Family Family family	a.22.1.1 — Nucleosome core histones

Domain ID domain_id	d1s32c_
Class class	a — All alpha proteins
Fold Fold fold	a.22 — Histone-fold
Superfamily Superfamily superfamily	a.22.1 — Histone-fold
Family Family family	a.22.1.1 — Nucleosome core histones

Domain ID domain_id	d1s32d_
Class class	a — All alpha proteins
Fold Fold fold	a.22 — Histone-fold
Superfamily Superfamily superfamily	a.22.1 — Histone-fold
Family Family family	a.22.1.1 — Nucleosome core histones

Domain ID domain_id	d1s32e_
Class class	a — All alpha proteins
Fold Fold fold	a.22 — Histone-fold
Superfamily Superfamily superfamily	a.22.1 — Histone-fold
Family Family family	a.22.1.1 — Nucleosome core histones

Domain ID domain_id	d1s32f_
Class class	a — All alpha proteins
Fold Fold fold	a.22 — Histone-fold
Superfamily Superfamily superfamily	a.22.1 — Histone-fold
Family Family family	a.22.1.1 — Nucleosome core histones

Domain ID domain_id	d1s32g_
Class class	a — All alpha proteins
Fold Fold fold	a.22 — Histone-fold
Superfamily Superfamily superfamily	a.22.1 — Histone-fold
Family Family family	a.22.1.1 — Nucleosome core histones

Domain ID domain_id	d1s32h_
Class class	a — All alpha proteins
Fold Fold fold	a.22 — Histone-fold
Superfamily Superfamily superfamily	a.22.1 — Histone-fold
Family Family family	a.22.1.1 — Nucleosome core histones

CATH v4.4 (8 domains)

Domain ID domain_id	1s32A00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	20 — Histone, subunit A
Homologous superfamily homologous superfamily	10 — Histone, subunit A

Domain ID domain_id	1s32B00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	20 — Histone, subunit A
Homologous superfamily homologous superfamily	10 — Histone, subunit A

Domain ID domain_id	1s32C00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	20 — Histone, subunit A
Homologous superfamily homologous superfamily	10 — Histone, subunit A

Domain ID domain_id	1s32D00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	20 — Histone, subunit A
Homologous superfamily homologous superfamily	10 — Histone, subunit A

Domain ID domain_id	1s32E00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	20 — Histone, subunit A
Homologous superfamily homologous superfamily	10 — Histone, subunit A

Domain ID domain_id	1s32F00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	20 — Histone, subunit A
Homologous superfamily homologous superfamily	10 — Histone, subunit A

Domain ID domain_id	1s32G00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	20 — Histone, subunit A
Homologous superfamily homologous superfamily	10 — Histone, subunit A

Domain ID domain_id	1s32H00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	20 — Histone, subunit A
Homologous superfamily homologous superfamily	10 — Histone, subunit A

▶

Unit-cell length a length_a	105.352 Å
Unit-cell length b length_b	109.717 Å
Unit-cell length c length_c	181.827 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	2.050 Å
Low-resolution limit resolution_low	100.000 Å
R factor r_factor	—
R_work r_work	0.2194
R_free r_free	0.2434

Molecular Recognition of the Nucleosomal 'Supergroove'

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

Histone H3

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Histone H4

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Histone H2A

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Histone H2B

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

1s32__assembly_1__model_1

1s32__assembly_1__model_1 | I(q)

1s32__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 (14)

Entity 1 Entity 1 polymer

Polymer Polymer

Entity 2 Entity 2 polymer

Polymer Polymer

Source Source

Entity 3 Entity 3 polymer

Polymer Polymer

Source Source

Entity 4 Entity 4 polymer

Polymer Polymer

Source Source

Entity 5 Entity 5 polymer

Polymer Polymer

Source Source

Entity 6 Entity 6 non-polymer

Entity 7 Entity 7 non-polymer

Entity 8 Entity 8 non-polymer

Entity 9 Entity 9 non-polymer

Entity 10 Entity 10 non-polymer

Entity 11 Entity 11 non-polymer

Entity 12 Entity 12 non-polymer

Entity 13 Entity 13 non-polymer

Entity 14 Entity 14 water

6. Fold Classification (SCOP + CATH) 16 domains

SCOP 2.08 (8 domains)

CATH v4.4 (8 domains)

7. Citations (1)