3ex8

Complex structure of bacillus subtilis RibG reduction mechanism in riboflavin biosynthesis

Method: X-RAY DIFFRACTION

▼

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

Riboflavin biosynthesis protein ribD

Bacillus subtilis

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 4	ZINC ION × 4 [(2R,3S,4R,5E)-5-[(5-amino-2,6-dioxo-3H-pyrimidin-4-yl)imino]-2,3,4-trihydroxy-pentyl] dihydrogen phosphate × 1 water × 4	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	RIBD_BACSU
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 13–373； UniProt 1–361 Author chain B； PDBConstruct 13–373； UniProt 1–361 Author chain C； PDBConstruct 13–373； UniProt 1–361 Author chain D； PDBConstruct 13–373； UniProt 1–361

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.

▼

2. Structure Basics 2. Structure Basics

Entry ID entry_id	3ex8
Deposition date deposition_date	2008-10-16
Structure title title	Complex structure of bacillus subtilis RibG reduction mechanism in riboflavin biosynthesis
Keywords keywords	;alpha/beta/alpha, deaminase domain, reductase domain, Metal-binding, Multifunctional enzyme, NADP, Riboflavin biosynthesis, Zinc, HYDROLASE, OXIDOREDUCTASE ;; HYDROLASE, OXIDOREDUCTASE
Experimental Method method	X-RAY DIFFRACTION

▼

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.

3ex8__assembly_1__model_1

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

Download this curve (.dat)

3ex8__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

3ex8__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	41.92 Å
Rg (electron density)	41.16 Å
Total Rg	41.60 Å
Atom count	10997
Residues	1437
Excluded volume	197190 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3ex8__assembly_1__model_1`	tetrameric （4）	Success	4.1.3-1-20251215 (887e7ef)	View Download

▶

4. Crystallography and Experiment 4. Crystallography & Experiment

▶

5. Entities and Polymers Entities & Polymers (4)

Entity 1 Entity 1 polymer

Description description	Riboflavin biosynthesis protein ribD
Molecular weight formula_weight	40759.8 kDa
EC 编号 ec_number	3.5.4.26, 1.1.1.193
Source method src_method	man
Copy count entity_count	4

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C,D
Atom count atom_count	11188

MRGSHHHHHHGSMEEYYMKLALDLAKQGEGQTESNPLVGAVVVKDGQIVGMGAHLKYGEAHAEVHAIHMAGAHAEGADIYVTLEPCSHYGKTPPCAELIINSGIKRVFVAMRDPNPLVAGRGISMMKEAGIEVREGILADQAERLNEKFLHFMRTGLPYVTLKAAASLDGKIATSTGDSKWITSEAARQDAQQYRKTHQSILVGVGTVKADNPSLTCRLPNVTKQPVRVILDTVLSIPEDAKVICDQIAPTWIFTTARADEEKKKRLSAFGVNIFTLETERIQIPDVLKILAEEGIMSVYVEGGSAVHGSFVKEGCFQEIIFYFAPKLIGGTHAPSLISGEGFQSMKDVPLLQFTDITQIGRDIKLTAKPTKE

Source Source

Source organism organism	Bacillus subtilis
NCBI taxonomy ID ncbi_taxonomy_id	1423
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 non-polymer

Description description	ZINC ION
Molecular weight formula_weight	65.4 kDa
Source method src_method	syn
Copy count entity_count	4

Entity 3 Entity 3 non-polymer

Description description	[(2R,3S,4R,5E)-5-[(5-amino-2,6-dioxo-3H-pyrimidin-4-yl)imino]-2,3,4-trihydroxy-pentyl] dihydrogen phosphate
Molecular weight formula_weight	354.2 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 4 Entity 4 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	191

▼

6. Fold Classification (SCOP + CATH) 17 domains

SCOP 2.08 (9 domains)

Domain ID domain_id	d3ex8a1
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.97 — Cytidine deaminase-like
Superfamily Superfamily superfamily	c.97.1 — Cytidine deaminase-like
Family Family family	c.97.1.2 — Deoxycytidylate deaminase-like

Domain ID domain_id	d3ex8a2
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.71 — Dihydrofolate reductase-like
Superfamily Superfamily superfamily	c.71.1 — Dihydrofolate reductase-like
Family Family family	c.71.1.2 — RibD C-terminal domain-like

Domain ID domain_id	d3ex8b1
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.97 — Cytidine deaminase-like
Superfamily Superfamily superfamily	c.97.1 — Cytidine deaminase-like
Family Family family	c.97.1.2 — Deoxycytidylate deaminase-like

Domain ID domain_id	d3ex8b2
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.71 — Dihydrofolate reductase-like
Superfamily Superfamily superfamily	c.71.1 — Dihydrofolate reductase-like
Family Family family	c.71.1.2 — RibD C-terminal domain-like

Domain ID domain_id	d3ex8c1
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.97 — Cytidine deaminase-like
Superfamily Superfamily superfamily	c.97.1 — Cytidine deaminase-like
Family Family family	c.97.1.2 — Deoxycytidylate deaminase-like

Domain ID domain_id	d3ex8c2
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.71 — Dihydrofolate reductase-like
Superfamily Superfamily superfamily	c.71.1 — Dihydrofolate reductase-like
Family Family family	c.71.1.2 — RibD C-terminal domain-like

Domain ID domain_id	d3ex8d1
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.97 — Cytidine deaminase-like
Superfamily Superfamily superfamily	c.97.1 — Cytidine deaminase-like
Family Family family	c.97.1.2 — Deoxycytidylate deaminase-like

Domain ID domain_id	d3ex8d2
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.71 — Dihydrofolate reductase-like
Superfamily Superfamily superfamily	c.71.1 — Dihydrofolate reductase-like
Family Family family	c.71.1.2 — RibD C-terminal domain-like

Domain ID domain_id	d3ex8d3
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 (8 domains)

Domain ID domain_id	3ex8A01
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	140 — Cytidine Deaminase; domain 2
Homologous superfamily homologous superfamily	10 — Cytidine Deaminase, domain 2

Domain ID domain_id	3ex8A02
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	430 — Dihydrofolate Reductase, subunit A
Homologous superfamily homologous superfamily	10 — Dihydrofolate Reductase, subunit A

Domain ID domain_id	3ex8B01
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	140 — Cytidine Deaminase; domain 2
Homologous superfamily homologous superfamily	10 — Cytidine Deaminase, domain 2

Domain ID domain_id	3ex8B02
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	430 — Dihydrofolate Reductase, subunit A
Homologous superfamily homologous superfamily	10 — Dihydrofolate Reductase, subunit A

Domain ID domain_id	3ex8C01
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	140 — Cytidine Deaminase; domain 2
Homologous superfamily homologous superfamily	10 — Cytidine Deaminase, domain 2

Domain ID domain_id	3ex8C02
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	430 — Dihydrofolate Reductase, subunit A
Homologous superfamily homologous superfamily	10 — Dihydrofolate Reductase, subunit A

Domain ID domain_id	3ex8D01
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	140 — Cytidine Deaminase; domain 2
Homologous superfamily homologous superfamily	10 — Cytidine Deaminase, domain 2

Domain ID domain_id	3ex8D02
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	430 — Dihydrofolate Reductase, subunit A
Homologous superfamily homologous superfamily	10 — Dihydrofolate Reductase, subunit A

▶

Unit-cell length a length_a	87.078 Å
Unit-cell length b length_b	108.367 Å
Unit-cell length c length_c	187.394 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.00 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	16

Space group space_group	P 21 21 21
Space-group number int_tables_number	19
Crystal system crystal_system	—

Resolution resolution	2.560 Å
Low-resolution limit resolution_low	50.000 Å
R factor r_factor	0.2290
R_work r_work	0.2290
R_free r_free	0.2830

Complex structure of bacillus subtilis RibG reduction mechanism in riboflavin biosynthesis

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

Riboflavin biosynthesis protein ribD

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

3ex8__assembly_1__model_1

3ex8__assembly_1__model_1 | I(q)

3ex8__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 (4)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 water

6. Fold Classification (SCOP + CATH) 17 domains

SCOP 2.08 (9 domains)

CATH v4.4 (8 domains)

7. Citations (2)

Complex structure of bacillus subtilis RibG reduction mechanism in riboflavin biosynthesis

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

Riboflavin biosynthesis protein ribD

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

3ex8__assembly_1__model_1

3ex8__assembly_1__model_1 | I(q)

3ex8__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 (4)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 water

6. Fold Classification (SCOP + CATH) 17 domains

SCOP 2.08 (9 domains)

CATH v4.4 (8 domains)

7. Citations (2)