1bdf

STRUCTURE OF ESCHERICHIA COLI RNA POLYMERASE ALPHA SUBUNIT N-TERMINAL DOMAIN

Method: X-RAY DIFFRACTION

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

RNA POLYMERASE ALPHA SUBUNIT

Escherichia coli

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	RPOA_ECOLI
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–235； UniProt 1–235 Author chain B； PDBConstruct 1–235； UniProt 1–235 Author chain C； PDBConstruct 1–235； UniProt 1–235 Author chain D； PDBConstruct 1–235； UniProt 1–235

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	1bdf
Deposition date deposition_date	1998-05-08
Structure title title	STRUCTURE OF ESCHERICHIA COLI RNA POLYMERASE ALPHA SUBUNIT N-TERMINAL DOMAIN
Keywords keywords	NUCLEOTIDYLTRANSFERASE, RNAP, ALPHA, ASSEMBLE; NUCLEOTIDYLTRANSFERASE
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.

1bdf__assembly_1__model_1

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

Download this curve (.dat)

1bdf__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1bdf__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	40.71 Å
Rg (electron density)	41.26 Å
Total Rg	41.16 Å
Atom count	6940
Residues	917
Excluded volume	123640 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1bdf__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) 16 domains

SCOP 2.08 (8 domains)

Domain ID domain_id	d1bdfa1
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.74 — DCoH-like
Superfamily Superfamily superfamily	d.74.3 — RBP11-like subunits of RNA polymerase
Family Family family	d.74.3.1 — RNA polymerase alpha subunit dimerisation domain

Domain ID domain_id	d1bdfa2
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.181 — Insert subdomain of RNA polymerase alpha subunit
Superfamily Superfamily superfamily	d.181.1 — Insert subdomain of RNA polymerase alpha subunit
Family Family family	d.181.1.1 — Insert subdomain of RNA polymerase alpha subunit

Domain ID domain_id	d1bdfb1
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.74 — DCoH-like
Superfamily Superfamily superfamily	d.74.3 — RBP11-like subunits of RNA polymerase
Family Family family	d.74.3.1 — RNA polymerase alpha subunit dimerisation domain

Domain ID domain_id	d1bdfb2
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.181 — Insert subdomain of RNA polymerase alpha subunit
Superfamily Superfamily superfamily	d.181.1 — Insert subdomain of RNA polymerase alpha subunit
Family Family family	d.181.1.1 — Insert subdomain of RNA polymerase alpha subunit

Domain ID domain_id	d1bdfc1
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.74 — DCoH-like
Superfamily Superfamily superfamily	d.74.3 — RBP11-like subunits of RNA polymerase
Family Family family	d.74.3.1 — RNA polymerase alpha subunit dimerisation domain

Domain ID domain_id	d1bdfc2
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.181 — Insert subdomain of RNA polymerase alpha subunit
Superfamily Superfamily superfamily	d.181.1 — Insert subdomain of RNA polymerase alpha subunit
Family Family family	d.181.1.1 — Insert subdomain of RNA polymerase alpha subunit

Domain ID domain_id	d1bdfd1
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.74 — DCoH-like
Superfamily Superfamily superfamily	d.74.3 — RBP11-like subunits of RNA polymerase
Family Family family	d.74.3.1 — RNA polymerase alpha subunit dimerisation domain

Domain ID domain_id	d1bdfd2
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.181 — Insert subdomain of RNA polymerase alpha subunit
Superfamily Superfamily superfamily	d.181.1 — Insert subdomain of RNA polymerase alpha subunit
Family Family family	d.181.1.1 — Insert subdomain of RNA polymerase alpha subunit

CATH v4.4 (8 domains)

Domain ID domain_id	1bdfA01
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	1360 — Gyrase A; domain 2
Homologous superfamily homologous superfamily	10 — RNA polymerase, RBP11-like subunit

Domain ID domain_id	1bdfA02
Class class	2 — Mainly Beta
Architecture architecture	170 — Beta Complex
Topology topology	120 — RNA Polymerase Alpha Subunit; Chain A, domain 2
Homologous superfamily homologous superfamily	12 — DNA-directed RNA polymerase, insert domain

Domain ID domain_id	1bdfB01
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	1360 — Gyrase A; domain 2
Homologous superfamily homologous superfamily	10 — RNA polymerase, RBP11-like subunit

Domain ID domain_id	1bdfB02
Class class	2 — Mainly Beta
Architecture architecture	170 — Beta Complex
Topology topology	120 — RNA Polymerase Alpha Subunit; Chain A, domain 2
Homologous superfamily homologous superfamily	12 — DNA-directed RNA polymerase, insert domain

Domain ID domain_id	1bdfC01
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	1360 — Gyrase A; domain 2
Homologous superfamily homologous superfamily	10 — RNA polymerase, RBP11-like subunit

Domain ID domain_id	1bdfC02
Class class	2 — Mainly Beta
Architecture architecture	170 — Beta Complex
Topology topology	120 — RNA Polymerase Alpha Subunit; Chain A, domain 2
Homologous superfamily homologous superfamily	12 — DNA-directed RNA polymerase, insert domain

Domain ID domain_id	1bdfD01
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	1360 — Gyrase A; domain 2
Homologous superfamily homologous superfamily	10 — RNA polymerase, RBP11-like subunit

Domain ID domain_id	1bdfD02
Class class	2 — Mainly Beta
Architecture architecture	170 — Beta Complex
Topology topology	120 — RNA Polymerase Alpha Subunit; Chain A, domain 2
Homologous superfamily homologous superfamily	12 — DNA-directed RNA polymerase, insert domain

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Unit-cell length a length_a	117.200 Å
Unit-cell length b length_b	117.200 Å
Unit-cell length c length_c	350.400 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	72

Space group space_group	H 3 2
Space-group number int_tables_number	155
Crystal system crystal_system	—

Resolution resolution	2.500 Å
Low-resolution limit resolution_low	6.000 Å
R factor r_factor	0.2250
R_work r_work	0.2250
R_free r_free	0.3080

Description description	RNA POLYMERASE ALPHA SUBUNIT
Molecular weight formula_weight	25913.5 kDa
EC 编号 ec_number	2.7.7.6
Mutation mutation	R45A
Source method src_method	man
Copy count entity_count	4

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C,D
Atom count atom_count	7179

STRUCTURE OF ESCHERICHIA COLI RNA POLYMERASE ALPHA SUBUNIT N-TERMINAL DOMAIN

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

RNA POLYMERASE ALPHA SUBUNIT

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

1bdf__assembly_1__model_1

1bdf__assembly_1__model_1 | I(q)

1bdf__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

Source Source

Entity 2 Entity 2 water

6. Fold Classification (SCOP + CATH) 16 domains

SCOP 2.08 (8 domains)

CATH v4.4 (8 domains)

7. Citations (1)

Source organism organism	Escherichia coli
NCBI taxonomy ID ncbi_taxonomy_id	562
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	239

STRUCTURE OF ESCHERICHIA COLI RNA POLYMERASE ALPHA SUBUNIT N-TERMINAL DOMAIN

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

RNA POLYMERASE ALPHA SUBUNIT

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

1bdf__assembly_1__model_1

1bdf__assembly_1__model_1 | I(q)

1bdf__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

Source Source

Entity 2 Entity 2 water

6. Fold Classification (SCOP + CATH) 16 domains

SCOP 2.08 (8 domains)

CATH v4.4 (8 domains)

7. Citations (1)