SAXSdb — 2byk

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

CHRAC-16

DROSOPHILA MELANOGASTER

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 2	CHRAC-14 × 1 （Q9V444） SULFATE ION × 2 water × 2	Consistent with protein count
2	Protein heterocomplex	Heteromer	Protein 2	CHRAC-14 × 1 （Q9V444） SULFATE ION × 1 water × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	Q9V452_DROME
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–140； UniProt 1–140 Author chain C； PDBConstruct 1–140； UniProt 1–140

CHRAC-14

DROSOPHILA MELANOGASTER

UniProt Q9V444

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 2	CHRAC-16 × 1 （Q9V452） SULFATE ION × 2 water × 2	Consistent with protein count
2	Protein heterocomplex	Heteromer	Protein 2	CHRAC-16 × 1 （Q9V452） SULFATE ION × 1 water × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	Q9V444_DROME
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain B； PDBConstruct 1–128； UniProt 1–128 Author chain D； PDBConstruct 1–128； UniProt 1–128

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	2byk
Deposition date deposition_date	2005-08-03
Structure title title	Histone fold heterodimer of the Chromatin Accessibility Complex
Keywords keywords	CHRAC-14, NUCLEOSOME SLIDING, HISTONE FOLD, CHRAC-16, DNA-BINDING PROTEIN, DNA BINDING 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.

2byk__assembly_2__model_1

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

Download this curve (.dat)

2byk__assembly_2__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

2byk__assembly_2__model_1 | P(r) · Pending

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

Rg（Guinier）	17.98 Å
Rg (electron density)	16.69 Å
Total Rg	17.76 Å
Atom count	1229
Residues	158
Excluded volume	22099 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`2byk__assembly_1__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`2byk__assembly_2__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 (4)

Entity 1 Entity 1 polymer

Description description	CHRAC-16
Molecular weight formula_weight	16020.7 kDa
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,C
Atom count atom_count	2518

MGEPRSQPPVERPPTAETFLPLSRVRTIMKSSMDTGLITNEVLFLMTKCTELFVRHLAGAAYTEEFGQRPGEALKYEHLSQVVNKNKNLEFLLQIVPQKIRVHQFQEMLRLNRSAGSDDDDDDDDDDDEEESESESESDE

Source Source

Source organism organism	DROSOPHILA MELANOGASTER
Common name common_name	FRUIT FLY
NCBI taxonomy ID ncbi_taxonomy_id	7227
Host organism host_organism	ESCHERICHIA COLI

Entity 2 Entity 2 polymer

Description description	CHRAC-14
Molecular weight formula_weight	13862.6 kDa
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

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

MVERIEDLNLPNAVIGRLIKEALPESASVSKEARAAIARAASVFAIFVTSSSTALAHKQNHKTITAKDILQTLTELDFESFVPSLTQDLEVYRKVVKEKKESKASKKDSNTAENANASATATAEEAPE

Source Source

Source organism organism	DROSOPHILA MELANOGASTER
Common name common_name	FRUIT FLY
NCBI taxonomy ID ncbi_taxonomy_id	7227
Host organism host_organism	ESCHERICHIA COLI

Entity 3 Entity 3 non-polymer

Description description	SULFATE ION
Molecular weight formula_weight	96.1 kDa
Source method src_method	syn
Copy count entity_count	3

Entity 4 Entity 4 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	38

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6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

Domain ID domain_id	d2byka1
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.22.1.3 — TBP-associated factors, TAFs

Domain ID domain_id	d2bykb1
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.22.1.3 — TBP-associated factors, TAFs

Domain ID domain_id	d2bykc_
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.22.1.3 — TBP-associated factors, TAFs

Domain ID domain_id	d2bykd_
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.22.1.3 — TBP-associated factors, TAFs

CATH v4.4 (4 domains)

Domain ID domain_id	2bykA00
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	2bykB00
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	2bykC00
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	2bykD00
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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Unit-cell length a length_a	76.010 Å
Unit-cell length b length_b	76.010 Å
Unit-cell length c length_c	166.080 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	12

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

Resolution resolution	2.400 Å
Low-resolution limit resolution_low	23.830 Å
R factor r_factor	0.2370
R_work r_work	0.2370
R_free r_free	0.2780

Histone fold heterodimer of the Chromatin Accessibility Complex

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

CHRAC-16

State in the Current Structure

Other States of the Same Protein in the Database

CHRAC-14

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

2byk__assembly_2__model_1

2byk__assembly_2__model_1 | I(q)

2byk__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 (4)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

Source Source

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 water

6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (1)

Histone fold heterodimer of the Chromatin Accessibility Complex

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

CHRAC-16

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

CHRAC-14

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

2byk__assembly_2__model_1

2byk__assembly_2__model_1 | I(q)

2byk__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 (4)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

Source Source

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 water

6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (1)