3d1e

Crystal structure of E. coli sliding clamp (beta) bound to a polymerase II peptide

Method: X-RAY DIFFRACTION

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

DNA polymerase III subunit beta

Escherichia coli

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 3	decamer from polymerase II C-terminal × 1 water × 3	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	DPO3B_ECOLI
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–366； UniProt 1–366 Author chain B； PDBConstruct 1–366； UniProt 1–366

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	3d1e
Deposition date deposition_date	2008-05-05
Structure title title	Crystal structure of E. coli sliding clamp (beta) bound to a polymerase II peptide
Keywords keywords	;chemical probe, DNA polymerase, DNA sliding clamp, DNA replication, rational drug design, antibiotic target, TRANSFERASE, TRANSCRIPTION ;; TRANSFERASE, 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.

3d1e__assembly_1__model_1

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

Download this curve (.dat)

3d1e__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

3d1e__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	32.99 Å
Rg (electron density)	31.84 Å
Total Rg	32.51 Å
Atom count	5733
Residues	738
Excluded volume	102210 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3d1e__assembly_1__model_1`	trimeric （3）	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 (3)

Entity 1 Entity 1 polymer

Description description	DNA polymerase III subunit beta
Molecular weight formula_weight	40630.5 kDa
EC 编号 ec_number	2.7.7.7
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B
Atom count atom_count	6205

MKFTVEREHLLKPLQQVSGPLGGRPTLPILGNLLLQVADGTLSLTGTDLEMEMVARVALVQPHEPGATTVPARKFFDICRGLPEGAEIAVQLEGERMLVRSGRSRFSLSTLPAADFPNLDDWQSEVEFTLPQATMKRLIEATQFSMAHQDVRYYLNGMLFETEGEELRTVATDGHRLAVCSMPIGQSLPSHSVIVPRKGVIELMRMLDGGDNPLRVQIGSNNIRAHVGDFIFTSKLVDGRFPDYRRVLPKNPDKHLEAGCDLLKQAFARAAILSNEKFRGVRLYVSENQLKITANNPEQEEAEEILDVTYSGAEMEIGFNVSYVLDVLNALKCENVRMMLTDSVSSVQIEDAASQSAAYVVMPMRL

Source Source

Source organism organism	Escherichia coli
NCBI taxonomy ID ncbi_taxonomy_id	562
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 polymer

Description description	decamer from polymerase II C-terminal
Molecular weight formula_weight	1080.3 kDa
Source method src_method	syn
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	P

TLMTGQLGLF

Entity 3 Entity 3 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	472

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6. Fold Classification (SCOP + CATH) 12 domains

SCOP 2.08 (6 domains)

Domain ID domain_id	d3d1ea1
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.131 — DNA clamp
Superfamily Superfamily superfamily	d.131.1 — DNA clamp
Family Family family	d.131.1.1 — DNA polymerase III, beta subunit

Domain ID domain_id	d3d1ea2
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.131 — DNA clamp
Superfamily Superfamily superfamily	d.131.1 — DNA clamp
Family Family family	d.131.1.1 — DNA polymerase III, beta subunit

Domain ID domain_id	d3d1ea3
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.131 — DNA clamp
Superfamily Superfamily superfamily	d.131.1 — DNA clamp
Family Family family	d.131.1.1 — DNA polymerase III, beta subunit

Domain ID domain_id	d3d1eb1
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.131 — DNA clamp
Superfamily Superfamily superfamily	d.131.1 — DNA clamp
Family Family family	d.131.1.1 — DNA polymerase III, beta subunit

Domain ID domain_id	d3d1eb2
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.131 — DNA clamp
Superfamily Superfamily superfamily	d.131.1 — DNA clamp
Family Family family	d.131.1.1 — DNA polymerase III, beta subunit

Domain ID domain_id	d3d1eb3
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.131 — DNA clamp
Superfamily Superfamily superfamily	d.131.1 — DNA clamp
Family Family family	d.131.1.1 — DNA polymerase III, beta subunit

CATH v4.4 (6 domains)

Domain ID domain_id	3d1eA01
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	150 — DNA Polymerase III; Chain A, domain 2
Homologous superfamily homologous superfamily	10 — DNA Polymerase III, subunit A, domain 2

Domain ID domain_id	3d1eA02
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	150 — DNA Polymerase III; Chain A, domain 2
Homologous superfamily homologous superfamily	10 — DNA Polymerase III, subunit A, domain 2

Domain ID domain_id	3d1eA03
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	150 — DNA Polymerase III; Chain A, domain 2
Homologous superfamily homologous superfamily	10 — DNA Polymerase III, subunit A, domain 2

Domain ID domain_id	3d1eB01
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	150 — DNA Polymerase III; Chain A, domain 2
Homologous superfamily homologous superfamily	10 — DNA Polymerase III, subunit A, domain 2

Domain ID domain_id	3d1eB02
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	150 — DNA Polymerase III; Chain A, domain 2
Homologous superfamily homologous superfamily	10 — DNA Polymerase III, subunit A, domain 2

Domain ID domain_id	3d1eB03
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	150 — DNA Polymerase III; Chain A, domain 2
Homologous superfamily homologous superfamily	10 — DNA Polymerase III, subunit A, domain 2

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Unit-cell length a length_a	40.139 Å
Unit-cell length b length_b	69.869 Å
Unit-cell length c length_c	73.119 Å
Unit-cell angle α angle_alpha	112.89 °
Unit-cell angle β angle_beta	91.08 °
Unit-cell angle γ angle_gamma	99.28 °
Molecules per unit cell Z z_pdb	2

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

Resolution resolution	1.900 Å
Low-resolution limit resolution_low	33.550 Å
R factor r_factor	—
R_work r_work	0.2260
R_free r_free	0.2610

Crystal structure of E. coli sliding clamp (beta) bound to a polymerase II peptide

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

DNA polymerase III subunit beta

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

3d1e__assembly_1__model_1

3d1e__assembly_1__model_1 | I(q)

3d1e__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 (3)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 12 domains

SCOP 2.08 (6 domains)

CATH v4.4 (6 domains)

7. Citations (1)

Crystal structure of E. coli sliding clamp (beta) bound to a polymerase II peptide

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

DNA polymerase III subunit beta

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

3d1e__assembly_1__model_1

3d1e__assembly_1__model_1 | I(q)

3d1e__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 (3)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 12 domains

SCOP 2.08 (6 domains)

CATH v4.4 (6 domains)

7. Citations (1)