SAXSdb — 1r2k

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

Molybdenum cofactor biosynthesis protein B

Escherichia coli

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 2	SULFATE ION × 2 water × 2	Consistent with protein count
2	Protein homooligomer	Homooligomer	Protein 6	SULFATE ION × 6 water × 6	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	MOAB_ECOLI
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–169； UniProt 1–169 Author chain B； PDBConstruct 1–169； UniProt 1–169

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	1r2k
Deposition date deposition_date	2003-09-28
Structure title title	Crystal structure of MoaB from Escherichia coli
Keywords keywords	alpha-beta, BIOSYNTHETIC PROTEIN; BIOSYNTHETIC PROTEIN
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.

1r2k__assembly_2__model_1

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

Download this curve (.dat)

1r2k__assembly_2__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1r2k__assembly_2__model_1 | P(r) · Pending

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

Rg（Guinier）	30.39 Å
Rg (electron density)	29.04 Å
Total Rg	29.77 Å
Atom count	7824
Residues	996
Excluded volume	138030 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1r2k__assembly_1__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`1r2k__assembly_2__model_1`	hexameric （6）	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	Molybdenum cofactor biosynthesis protein B
Molecular weight formula_weight	18650.7 kDa
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	B,A
Atom count atom_count	2749

SQVSTEFIPTRIAILTVSNRRGEEDDTSGHYLRDSAQEAGHHVVDKAIVKENRYAIRAQVSAWIASDDVQVVLITGGTGLTEGDQAPEALLPLFDREVEGFGEVFRMLSFEEIGTSTLQSRAVAGVANKTLIFAMPGSTKACRTAWENIIAPQLDARTRPCNFHPHLKK

Source Source

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

Entity 2 Entity 2 non-polymer

Description description	SULFATE ION
Molecular weight formula_weight	96.1 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 3 Entity 3 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	141

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6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d1r2ka_
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.57 — Molybdenum cofactor biosynthesis proteins
Superfamily Superfamily superfamily	c.57.1 — Molybdenum cofactor biosynthesis proteins
Family Family family	c.57.1.1 — MogA-like

Domain ID domain_id	d1r2kb_
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.57 — Molybdenum cofactor biosynthesis proteins
Superfamily Superfamily superfamily	c.57.1 — Molybdenum cofactor biosynthesis proteins
Family Family family	c.57.1.1 — MogA-like

CATH v4.4 (2 domains)

Domain ID domain_id	1r2kA00
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	980 — Molybdenum Cofactor Biosythetic Enzyme; Chain A
Homologous superfamily homologous superfamily	10 — MoaB/Mog-like domain

Domain ID domain_id	1r2kB00
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	980 — Molybdenum Cofactor Biosythetic Enzyme; Chain A
Homologous superfamily homologous superfamily	10 — MoaB/Mog-like domain

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Unit-cell length a length_a	69.881 Å
Unit-cell length b length_b	69.881 Å
Unit-cell length c length_c	126.912 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 3 2 1
Space-group number int_tables_number	150
Crystal system crystal_system	—

Resolution resolution	2.100 Å
Low-resolution limit resolution_low	10.000 Å
R factor r_factor	0.2080
R_work r_work	0.2080
R_free r_free	0.2500

Crystal structure of MoaB from Escherichia coli

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

Molybdenum cofactor biosynthesis protein B

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

1r2k__assembly_2__model_1

1r2k__assembly_2__model_1 | I(q)

1r2k__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 (3)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)

Crystal structure of MoaB from Escherichia coli

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

Molybdenum cofactor biosynthesis protein B

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

1r2k__assembly_2__model_1

1r2k__assembly_2__model_1 | I(q)

1r2k__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 (3)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)