A0A8J6RJU5 · A0A8J6RJU5_9CYAN
- ProteinRiboflavin biosynthesis protein RibBA
- GeneribA
- StatusUniProtKB unreviewed (TrEMBL)
- Organism
- Amino acids581 (go to sequence)
- Protein existenceInferred from homology
- Annotation score4/5
Function
function
Catalyzes the conversion of D-ribulose 5-phosphate to formate and 3,4-dihydroxy-2-butanone 4-phosphate.
Catalyzes the conversion of GTP to 2,5-diamino-6-ribosylamino-4(3H)-pyrimidinone 5'-phosphate (DARP), formate and pyrophosphate.
Catalytic activity
- D-ribulose 5-phosphate = (2S)-2-hydroxy-3-oxobutyl phosphate + formate + H+
Cofactor
Protein has several cofactor binding sites:
Mn2+ (UniProtKB | Rhea| CHEBI:29035 )
Note: Binds 2 divalent metal cations per subunit. Magnesium or manganese.
Note: Binds 1 zinc ion per subunit.
Pathway
Cofactor biosynthesis; riboflavin biosynthesis; 2-hydroxy-3-oxobutyl phosphate from D-ribulose 5-phosphate: step 1/1.
Cofactor biosynthesis; riboflavin biosynthesis; 5-amino-6-(D-ribitylamino)uracil from GTP: step 1/4.
Features
Showing features for binding site, site, active site.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Binding site | 44-45 | D-ribulose 5-phosphate (UniProtKB | ChEBI) | ||||
Sequence: RE | ||||||
Binding site | 45 | Mg2+ 1 (UniProtKB | ChEBI) | ||||
Sequence: E | ||||||
Binding site | 45 | Mg2+ 2 (UniProtKB | ChEBI) | ||||
Sequence: E | ||||||
Binding site | 49 | D-ribulose 5-phosphate (UniProtKB | ChEBI) | ||||
Sequence: D | ||||||
Site | 148 | Essential for DHBP synthase activity | ||||
Sequence: H | ||||||
Binding site | 162-166 | D-ribulose 5-phosphate (UniProtKB | ChEBI) | ||||
Sequence: RAGHT | ||||||
Binding site | 165 | Mg2+ 2 (UniProtKB | ChEBI) | ||||
Sequence: H | ||||||
Binding site | 186 | D-ribulose 5-phosphate (UniProtKB | ChEBI) | ||||
Sequence: E | ||||||
Site | 186 | Essential for DHBP synthase activity | ||||
Sequence: E | ||||||
Binding site | 276-280 | GTP (UniProtKB | ChEBI) | ||||
Sequence: RVHSE | ||||||
Binding site | 281 | Zn2+ (UniProtKB | ChEBI); catalytic | ||||
Sequence: C | ||||||
Binding site | 292 | Zn2+ (UniProtKB | ChEBI); catalytic | ||||
Sequence: C | ||||||
Binding site | 294 | Zn2+ (UniProtKB | ChEBI); catalytic | ||||
Sequence: C | ||||||
Binding site | 297 | GTP (UniProtKB | ChEBI) | ||||
Sequence: Q | ||||||
Binding site | 319-321 | GTP (UniProtKB | ChEBI) | ||||
Sequence: EGR | ||||||
Binding site | 341 | GTP (UniProtKB | ChEBI) | ||||
Sequence: T | ||||||
Active site | 353 | Proton acceptor; for GTP cyclohydrolase activity | ||||
Sequence: D | ||||||
Active site | 355 | Nucleophile; for GTP cyclohydrolase activity | ||||
Sequence: R | ||||||
Binding site | 376 | GTP (UniProtKB | ChEBI) | ||||
Sequence: T | ||||||
Binding site | 381 | GTP (UniProtKB | ChEBI) | ||||
Sequence: K |
GO annotations
Aspect | Term | |
---|---|---|
Molecular Function | 3,4-dihydroxy-2-butanone-4-phosphate synthase activity | |
Molecular Function | GTP binding | |
Molecular Function | GTP cyclohydrolase II activity | |
Molecular Function | magnesium ion binding | |
Molecular Function | manganese ion binding | |
Molecular Function | zinc ion binding | |
Biological Process | riboflavin biosynthetic process |
Keywords
- Molecular function
- Biological process
- Ligand
Enzyme and pathway databases
Names & Taxonomy
Protein names
- Recommended nameRiboflavin biosynthesis protein RibBA
Including 2 domains:
- Recommended name3,4-dihydroxy-2-butanone 4-phosphate synthase
- EC number
- Short namesDHBP synthase
- Recommended nameGTP cyclohydrolase-2
- EC number
- Alternative names
Gene names
Organism names
- Organism
- Strain
- Taxonomic lineageBacteria > Cyanobacteriota > Cyanophyceae > Nodosilineales > Nodosilineaceae > Nodosilinea
Accessions
- Primary accessionA0A8J6RJU5
Proteomes
Structure
Family & Domains
Features
Showing features for region, domain.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Region | 1-223 | DHBP synthase | ||||
Sequence: MPPAPRQSPSDLELPSDFQFDSIESALHDLAAGKSIVVVDDENRENEGDVICAAQFATPDIINFMAVEARGLICLAMTGERLDQLDLPLMVSPSAFEDENEQTAFTVSIDAALSWGVTTGISADDRARTIQVAINPNARPQDLRRPGHIFPLRAKEGGVLKRAGHTEAGVDLARLAGLYPAGVICEIQNPDGSMARLPELVNYAKAFGLKLISIADLIHYRLQ | ||||||
Region | 224-581 | GTP cyclohydrolase II | ||||
Sequence: HERFVQREAVASMPTQFGDFAIYAYRNLLDGSEHVAMVKGDPATFADQSVMVRVHSECLTGDAFGSLRCDCRMQLQAALKMIDAAGRGVVVYLRQEGRGIGLVNKLKAYSLQDMGLDTVEANEKLGLPVDQRNYGIGAQILNDIGVQKFCLITNNPRKIAGIKGYGLDMVSRVPLIIEATAYNSGYLATKAQKLGHLLVQTYLATVAIHWRSGDLPVQERYQKLEHLRELAHSQGLLLQEEARPVAAALFSQPDLIVNLGLDTLPVAGSEVWYHDCAQPQMNAIATLLDKLAAWPEIDQLAFLISGGSDPFSGLQVGLDRQVFHHDAVPTPETVKPSDLCGSLESQRIYVFSSHLLAD | ||||||
Domain | 230-397 | GTP cyclohydrolase II | ||||
Sequence: REAVASMPTQFGDFAIYAYRNLLDGSEHVAMVKGDPATFADQSVMVRVHSECLTGDAFGSLRCDCRMQLQAALKMIDAAGRGVVVYLRQEGRGIGLVNKLKAYSLQDMGLDTVEANEKLGLPVDQRNYGIGAQILNDIGVQKFCLITNNPRKIAGIKGYGLDMVSRVP |
Sequence similarities
In the C-terminal section; belongs to the GTP cyclohydrolase II family.
In the N-terminal section; belongs to the DHBP synthase family.
Family and domain databases
Sequence
- Sequence statusComplete
- Length581
- Mass (Da)63,341
- Last updated2022-05-25 v1
- ChecksumF7AA030EEC6ED9C9