SAXSdb — 2hio

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

PROTEIN (HISTONE H2A)

OrganismNot specified

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 8	PROTEIN (HISTONE H2B) × 2 （P02279） PROTEIN (HISTONE H3) × 2 （P84229） PROTEIN (HISTONE H4) × 2 （P62801）	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	H2A4_CHICK
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–128； UniProt 1–128

PROTEIN (HISTONE H2B)

OrganismNot specified

UniProt P02279

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 8	PROTEIN (HISTONE H2A) × 2 （P02263） PROTEIN (HISTONE H3) × 2 （P84229） PROTEIN (HISTONE H4) × 2 （P62801）	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	H2B_CHICK
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain B； PDBConstruct 1–125； UniProt 1–125

PROTEIN (HISTONE H3)

OrganismNot specified

UniProt P84229

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 8	PROTEIN (HISTONE H2A) × 2 （P02263） PROTEIN (HISTONE H2B) × 2 （P02279） PROTEIN (HISTONE H4) × 2 （P62801）	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	H31_CHICK
Isoform	—
PDB entities	3
Chains and sequence ranges	Author chain C； PDBConstruct 1–136； UniProt 1–136

PROTEIN (HISTONE H4)

OrganismNot specified

UniProt P62801

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 8	PROTEIN (HISTONE H2A) × 2 （P02263） PROTEIN (HISTONE H2B) × 2 （P02279） PROTEIN (HISTONE H3) × 2 （P84229）	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	H4_CHICK
Isoform	—
PDB entities	4
Chains and sequence ranges	Author chain D； PDBConstruct 1–103； UniProt 1–103

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	2hio
Deposition date deposition_date	1999-06-15
Structure title title	HISTONE OCTAMER (CHICKEN), CHROMOSOMAL PROTEIN
Keywords keywords	HISTONE, CHROMOSOMAL PROTEIN, STRUCTURAL PROTEIN, DNA BINDING PROTEIN; STRUCTURAL PROTEIN,DNA BINDING PROTEIN
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.

2hio__assembly_1__model_1

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

Download this curve (.dat)

2hio__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

2hio__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	27.65 Å
Rg (electron density)	26.50 Å
Total Rg	27.53 Å
Atom count	5700
Residues	724
Excluded volume	102380 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`2hio__assembly_1__model_1`	octameric （8）	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 (4)

Entity 1 Entity 1 polymer

Description description	PROTEIN (HISTONE H2A)
Molecular weight formula_weight	13838.2 kDa
Source method src_method	nat
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A
Atom count atom_count	2850

SGRGKQGGKARAKAKSRSSRAGLQFPVGRVHRLLRKGNYAERVGAGAPVYLAAVLEYLTAEILELAGNAARDNKKTRIIPRHLQLAIRNDEELNKLLGKVTIAQGGVLPNIQAVLLPKKTDSHKAKAK

Entity 2 Entity 2 polymer

Description description	PROTEIN (HISTONE H2B)
Molecular weight formula_weight	13822.1 kDa
Source method src_method	nat
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	B

PEPAKSAPAPKKGSKKAVTKTQKKGDKKRKKSRKESYSIYVYKVLKQVHPDTGISSKAMGIMNSFVNDIFERIAGEASRLAHYNKRSTITSREIQTAVRLLLPGELAKHAVSEGTKAVTKYTSSK

Entity 3 Entity 3 polymer

Description description	PROTEIN (HISTONE H3)
Molecular weight formula_weight	15421.1 kDa
Source method src_method	nat
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	C

MARTKQTARKSTGGKAPRKQLATKAARKSAPATGGVKKPHRYRPGTVALREIRRYQKSTELLIRKLPFQRLVREIAQDFKTDLRFQSSAVMALQEASEAYLVGLFEDTNLCAIHAKRVTIMPKDIQLARRIRGERA

Entity 4 Entity 4 polymer

Description description	PROTEIN (HISTONE H4)
Molecular weight formula_weight	11466.5 kDa
Source method src_method	nat
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	D

MSGRGKGGKGLGKGGAKRHRKVLRDNIQGITKPAIRRLARRGGVKRISGLIYEETRGVLKVFLENVIRDAVTYTEHAKRKTVTAMDVVYALKRQERTLYGFGG

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6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

Domain ID domain_id	d2hioa_
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	d2hiob_
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	d2hioc_
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	d2hiod_
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 (4 domains)

Domain ID domain_id	2hioA00
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	2hioB00
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	2hioC00
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	2hioD00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	20 — Histone, subunit A
Homologous superfamily homologous superfamily	10 — Histone, subunit A

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7. Citations (7)

The nucleosomal core histone octamer at 3.1 A resolution: a tripartite protein assembly and a left-handed superhelix.

Proc.Natl.Acad.Sci.USA (1991)

PMID: 1946434 · DOI: 10.1073/pnas.88.22.10148 PRIMARY

Spectropolarimetric Analysis of the Core Histone Octamer and its Subunits

Biochemistry (1990)

Crystallographic Structure of the Octameric Histone Core of the Nucleosome at a Resolution of 3.3 A

Science (1985)

Crystals of the Octameric Histone Core of the Nucleosome

Science (1984)

Reversible Association of Calf Thymus Histones to Form the Symmetrical Octamer (H2Ah2Bh3H4)2: A Case of a Mixed-Associating System

Biochemistry (1980)

The Histone Core Complex: An Octamer Assembled by Two Sets of Protein-Protein Interactions

Biochemistry (1978)

The Compaction of DNA Helices Into Either Continuous Supercoils or Folded-Fiber Rods and Toroids

Cell(Cambridge,Mass.) (1978)

DOI: 10.1016/0092-8674(78)90198-8

Unit-cell length a length_a	118.820 Å
Unit-cell length b length_b	118.820 Å
Unit-cell length c length_c	102.930 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.00 °
Unit-cell angle γ angle_gamma	120.00 °
Molecules per unit cell Z z_pdb	6

Space group space_group	P 32 2 1
Space-group number int_tables_number	154
Crystal system crystal_system	—

Resolution resolution	3.100 Å
Low-resolution limit resolution_low	10.000 Å
R factor r_factor	0.2550
R_work r_work	—
R_free r_free	—

HISTONE OCTAMER (CHICKEN), CHROMOSOMAL PROTEIN

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

PROTEIN (HISTONE H2A)

State in the Current Structure

Other States of the Same Protein in the Database

PROTEIN (HISTONE H2B)

State in the Current Structure

Other States of the Same Protein in the Database

PROTEIN (HISTONE H3)

State in the Current Structure

Other States of the Same Protein in the Database

PROTEIN (HISTONE H4)

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

2hio__assembly_1__model_1

2hio__assembly_1__model_1 | I(q)

2hio__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 (4)

Entity 1 Entity 1 polymer

Polymer Polymer

Entity 2 Entity 2 polymer

Polymer Polymer

Entity 3 Entity 3 polymer

Polymer Polymer

Entity 4 Entity 4 polymer

Polymer Polymer

6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (7)

HISTONE OCTAMER (CHICKEN), CHROMOSOMAL PROTEIN

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

PROTEIN (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

PROTEIN (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

PROTEIN (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

PROTEIN (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

2. Structure Basics 2. Structure Basics

3. Official assembly/model SAXS Official SAXS Profiles

2hio__assembly_1__model_1

2hio__assembly_1__model_1 | I(q)

2hio__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 (4)

Entity 1 Entity 1 polymer

Polymer Polymer

Entity 2 Entity 2 polymer

Polymer Polymer

Entity 3 Entity 3 polymer

Polymer Polymer

Entity 4 Entity 4 polymer

Polymer Polymer

6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (7)