SAXSdb — 4om5

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

Cytotoxin 4

OrganismNot specified

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 4	water × 4	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	CTXA4_NAJAT
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–60； UniProt 22–81 Author chain B； PDBConstruct 1–60； UniProt 22–81 Author chain C； PDBConstruct 1–60； UniProt 22–81 Author chain D； PDBConstruct 1–60； UniProt 22–81

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	4om5
Deposition date deposition_date	2014-01-26
Structure title title	Crystal structure of CTX A4 from Taiwan Cobra (Naja naja atra)
Keywords keywords	Five beta sheets, three functional loops, endocytosis, heparin, heparan sulfate, TOXIN; TOXIN
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.

4om5__assembly_1__model_1

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

Download this curve (.dat)

4om5__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

4om5__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)	21.93 Å
Total Rg	22.83 Å
Atom count	1872
Residues	240
Excluded volume	34190 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`4om5__assembly_1__model_1`	tetrameric （4）	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 (2)

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6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

Domain ID domain_id	d4om5a_
Class class	g — Small proteins
Fold Fold fold	g.7 — Snake toxin-like
Superfamily Superfamily superfamily	g.7.1 — Snake toxin-like
Family Family family	g.7.1.1 — Snake venom toxins

Domain ID domain_id	d4om5b_
Class class	g — Small proteins
Fold Fold fold	g.7 — Snake toxin-like
Superfamily Superfamily superfamily	g.7.1 — Snake toxin-like
Family Family family	g.7.1.1 — Snake venom toxins

Domain ID domain_id	d4om5c_
Class class	g — Small proteins
Fold Fold fold	g.7 — Snake toxin-like
Superfamily Superfamily superfamily	g.7.1 — Snake toxin-like
Family Family family	g.7.1.1 — Snake venom toxins

Domain ID domain_id	d4om5d_
Class class	g — Small proteins
Fold Fold fold	g.7 — Snake toxin-like
Superfamily Superfamily superfamily	g.7.1 — Snake toxin-like
Family Family family	g.7.1.1 — Snake venom toxins

CATH v4.4 (4 domains)

Domain ID domain_id	4om5A00
Class class	2 — Mainly Beta
Architecture architecture	10 — Ribbon
Topology topology	60 — CD59
Homologous superfamily homologous superfamily	10 — CD59

Domain ID domain_id	4om5B00
Class class	2 — Mainly Beta
Architecture architecture	10 — Ribbon
Topology topology	60 — CD59
Homologous superfamily homologous superfamily	10 — CD59

Domain ID domain_id	4om5C00
Class class	2 — Mainly Beta
Architecture architecture	10 — Ribbon
Topology topology	60 — CD59
Homologous superfamily homologous superfamily	10 — CD59

Domain ID domain_id	4om5D00
Class class	2 — Mainly Beta
Architecture architecture	10 — Ribbon
Topology topology	60 — CD59
Homologous superfamily homologous superfamily	10 — CD59

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Unit-cell length a length_a	72.933 Å
Unit-cell length b length_b	72.933 Å
Unit-cell length c length_c	249.422 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	48

Space group space_group	P 65 2 2
Space-group number int_tables_number	179
Crystal system crystal_system	—

Resolution resolution	2.550 Å
Low-resolution limit resolution_low	31.050 Å
R factor r_factor	0.2172
R_work r_work	0.2149
R_free r_free	0.2624

Description description	Cytotoxin 4
Molecular weight formula_weight	6804.3 kDa
Source method src_method	nat
Copy count entity_count	4

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C,D
Atom count atom_count	1947

Crystal structure of CTX A4 from Taiwan Cobra (Naja naja atra)

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

Cytotoxin 4

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

4om5__assembly_1__model_1

4om5__assembly_1__model_1 | I(q)

4om5__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 (2)

Entity 1 Entity 1 polymer

Polymer Polymer

Entity 2 Entity 2 water

6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (1)

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	75

Crystal structure of CTX A4 from Taiwan Cobra (Naja naja atra)

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

Cytotoxin 4

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

4om5__assembly_1__model_1

4om5__assembly_1__model_1 | I(q)

4om5__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 (2)

Entity 1 Entity 1 polymer

Polymer Polymer

Entity 2 Entity 2 water

6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (1)