1k1q

Crystal Structure of a DinB Family Error Prone DNA Polymerase from Sulfolobus solfataricus

Method: X-RAY DIFFRACTION

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

DBH protein

Sulfolobus solfataricus

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein monomer	Monomer	Protein 1	water × 1	Consistent with protein count
2	Protein monomer	Monomer	Protein 1	water × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	DPO41_SULSO
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–354； UniProt 1–354 Author chain B； PDBConstruct 1–354； UniProt 1–354

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	1k1q
Deposition date deposition_date	2001-09-25
Structure title title	Crystal Structure of a DinB Family Error Prone DNA Polymerase from Sulfolobus solfataricus
Keywords keywords	DNA polymerase, error-prone polymerase, lesion-bypass polymerase, TRANSCRIPTION; TRANSCRIPTION
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.

1k1q__assembly_2__model_1

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

Download this curve (.dat)

1k1q__assembly_2__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1k1q__assembly_2__model_1 | P(r) · Pending

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

Rg（Guinier）	24.22 Å
Rg (electron density)	23.15 Å
Total Rg	24.00 Å
Atom count	2581
Residues	341
Excluded volume	46677 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1k1q__assembly_1__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`1k1q__assembly_2__model_1`	monomeric （1）	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) 12 domains

SCOP 2.08 (4 domains)

Domain ID domain_id	d1k1qa1
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.240 — Lesion bypass DNA polymerase (Y-family), little finger domain
Superfamily Superfamily superfamily	d.240.1 — Lesion bypass DNA polymerase (Y-family), little finger domain
Family Family family	d.240.1.1 — Lesion bypass DNA polymerase (Y-family), little finger domain

Domain ID domain_id	d1k1qa2
Class class	e — Multi-domain proteins (alpha and beta)
Fold Fold fold	e.8 — DNA/RNA polymerases
Superfamily Superfamily superfamily	e.8.1 — DNA/RNA polymerases
Family Family family	e.8.1.7 — Lesion bypass DNA polymerase (Y-family), catalytic domain

Domain ID domain_id	d1k1qb1
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.240 — Lesion bypass DNA polymerase (Y-family), little finger domain
Superfamily Superfamily superfamily	d.240.1 — Lesion bypass DNA polymerase (Y-family), little finger domain
Family Family family	d.240.1.1 — Lesion bypass DNA polymerase (Y-family), little finger domain

Domain ID domain_id	d1k1qb2
Class class	e — Multi-domain proteins (alpha and beta)
Fold Fold fold	e.8 — DNA/RNA polymerases
Superfamily Superfamily superfamily	e.8.1 — DNA/RNA polymerases
Family Family family	e.8.1.7 — Lesion bypass DNA polymerase (Y-family), catalytic domain

CATH v4.4 (8 domains)

Domain ID domain_id	1k1qA01
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	1170 — MutS, DNA mismatch repair protein, domain I
Homologous superfamily homologous superfamily	60 —

Domain ID domain_id	1k1qA02
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily	270 — Reverse transcriptase/Diguanylate cyclase domain

Domain ID domain_id	1k1qA03
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	150 — DNA polymerase; domain 1
Homologous superfamily homologous superfamily	20 — 5' to 3' exonuclease, C-terminal subdomain

Domain ID domain_id	1k1qA04
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	1490 — Dna Ligase; domain 1
Homologous superfamily homologous superfamily	100 — DNA polymerase, Y-family, little finger domain

Domain ID domain_id	1k1qB01
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	1170 — MutS, DNA mismatch repair protein, domain I
Homologous superfamily homologous superfamily	60 —

Domain ID domain_id	1k1qB02
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily	270 — Reverse transcriptase/Diguanylate cyclase domain

Domain ID domain_id	1k1qB03
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	150 — DNA polymerase; domain 1
Homologous superfamily homologous superfamily	20 — 5' to 3' exonuclease, C-terminal subdomain

Domain ID domain_id	1k1qB04
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	1490 — Dna Ligase; domain 1
Homologous superfamily homologous superfamily	100 — DNA polymerase, Y-family, little finger domain

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Unit-cell length a length_a	111.715 Å
Unit-cell length b length_b	111.715 Å
Unit-cell length c length_c	132.175 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 61
Space-group number int_tables_number	169
Crystal system crystal_system	—

Resolution resolution	2.800 Å
Low-resolution limit resolution_low	40.100 Å
R factor r_factor	—
R_work r_work	0.2630
R_free r_free	0.3060

Description description	DBH protein
Molecular weight formula_weight	40029.8 kDa
Mutation mutation	C31S
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	5166

Crystal Structure of a DinB Family Error Prone DNA Polymerase from Sulfolobus solfataricus

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

DBH protein

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

1k1q__assembly_2__model_1

1k1q__assembly_2__model_1 | I(q)

1k1q__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 (2)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 water

6. Fold Classification (SCOP + CATH) 12 domains

SCOP 2.08 (4 domains)

CATH v4.4 (8 domains)

7. Citations (1)

Source organism organism	Sulfolobus solfataricus
NCBI taxonomy ID ncbi_taxonomy_id	2287
Host organism host_organism	Escherichia coli

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	68

Crystal Structure of a DinB Family Error Prone DNA Polymerase from Sulfolobus solfataricus

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

DBH protein

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

1k1q__assembly_2__model_1

1k1q__assembly_2__model_1 | I(q)

1k1q__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 (2)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 water

6. Fold Classification (SCOP + CATH) 12 domains

SCOP 2.08 (4 domains)

CATH v4.4 (8 domains)

7. Citations (1)