SAXSdb — 1ou5

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

tRNA CCA-adding enzyme

Homo sapiens

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 2	No other associated polymer	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	TRNT1_HUMAN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 44–448； UniProt 30–434 Author chain B； PDBConstruct 44–448； UniProt 30–434

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	1ou5
Deposition date deposition_date	2003-03-24
Structure title title	Crystal structure of human CCA-adding enzyme
Keywords keywords	tRNA, polymerase, nucleotidyltransferase, TRANSLATION, TRANSFERASE; TRANSLATION, TRANSFERASE
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.

1ou5__assembly_1__model_1

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

Download this curve (.dat)

1ou5__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1ou5__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	40.47 Å
Rg (electron density)	40.62 Å
Total Rg	40.62 Å
Atom count	5570
Residues	688
Excluded volume	99550 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1ou5__assembly_1__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 (1)

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6. Fold Classification (SCOP + CATH) 10 domains

SCOP 2.08 (6 domains)

Domain ID domain_id	d1ou5a1
Class class	a — All alpha proteins
Fold Fold fold	a.173 — Poly A polymerase C-terminal region-like
Superfamily Superfamily superfamily	a.173.1 — Poly A polymerase C-terminal region-like
Family Family family	a.173.1.1 — Poly A polymerase C-terminal region-like

Domain ID domain_id	d1ou5a2
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.218 — Nucleotidyltransferase
Superfamily Superfamily superfamily	d.218.1 — Nucleotidyltransferase
Family Family family	d.218.1.4 — Poly A polymerase head domain-like

Domain ID domain_id	d1ou5a3
Class class	l — Artifacts
Fold Fold fold	l.1 — Tags
Superfamily Superfamily superfamily	l.1.1 — Tags
Family Family family	l.1.1.1 — Tags

Domain ID domain_id	d1ou5b1
Class class	a — All alpha proteins
Fold Fold fold	a.173 — Poly A polymerase C-terminal region-like
Superfamily Superfamily superfamily	a.173.1 — Poly A polymerase C-terminal region-like
Family Family family	a.173.1.1 — Poly A polymerase C-terminal region-like

Domain ID domain_id	d1ou5b2
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.218 — Nucleotidyltransferase
Superfamily Superfamily superfamily	d.218.1 — Nucleotidyltransferase
Family Family family	d.218.1.4 — Poly A polymerase head domain-like

Domain ID domain_id	d1ou5b3
Class class	l — Artifacts
Fold Fold fold	l.1 — Tags
Superfamily Superfamily superfamily	l.1.1 — Tags
Family Family family	l.1.1.1 — Tags

CATH v4.4 (4 domains)

Domain ID domain_id	1ou5A01
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	460 — Beta Polymerase; domain 2
Homologous superfamily homologous superfamily	10 — Beta Polymerase, domain 2

Domain ID domain_id	1ou5A02
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	3090 — cca-adding enzyme, domain 2
Homologous superfamily homologous superfamily	10 — cca-adding enzyme, domain 2

Domain ID domain_id	1ou5B01
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	460 — Beta Polymerase; domain 2
Homologous superfamily homologous superfamily	10 — Beta Polymerase, domain 2

Domain ID domain_id	1ou5B02
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	3090 — cca-adding enzyme, domain 2
Homologous superfamily homologous superfamily	10 — cca-adding enzyme, domain 2

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Unit-cell length a length_a	102.520 Å
Unit-cell length b length_b	102.520 Å
Unit-cell length c length_c	206.658 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	3.400 Å
Low-resolution limit resolution_low	20.000 Å
R factor r_factor	0.2820
R_work r_work	0.2780
R_free r_free	0.3180

Description description	tRNA CCA-adding enzyme
Molecular weight formula_weight	51225.1 kDa
Source method src_method	man
Copy count entity_count	2

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B
Atom count atom_count	5570

Crystal structure of human CCA-adding enzyme

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

tRNA CCA-adding enzyme

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

1ou5__assembly_1__model_1

1ou5__assembly_1__model_1 | I(q)

1ou5__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 (1)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

6. Fold Classification (SCOP + CATH) 10 domains

SCOP 2.08 (6 domains)

CATH v4.4 (4 domains)

7. Citations (1)

Source organism organism	Homo sapiens
Common name common_name	human
NCBI taxonomy ID ncbi_taxonomy_id	9606
Host organism host_organism	Escherichia coli

Crystal structure of human CCA-adding enzyme

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

tRNA CCA-adding enzyme

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

1ou5__assembly_1__model_1

1ou5__assembly_1__model_1 | I(q)

1ou5__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 (1)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

6. Fold Classification (SCOP + CATH) 10 domains

SCOP 2.08 (6 domains)

CATH v4.4 (4 domains)

7. Citations (1)