A9T794 · A9T794_PHYPA
- ProteinRibokinase
- StatusUniProtKB unreviewed (TrEMBL)
- Amino acids320 (go to sequence)
- Protein existenceInferred from homology
- Annotation score3/5
Function
function
Catalyzes the phosphorylation of ribose at O-5 in a reaction requiring ATP and magnesium. The resulting D-ribose-5-phosphate can then be used either for sythesis of nucleotides, histidine, and tryptophan, or as a component of the pentose phosphate pathway.
Catalytic activity
- D-ribose + ATP = D-ribose 5-phosphate + ADP + H+
Cofactor
Note: Requires a divalent cation, most likely magnesium in vivo, as an electrophilic catalyst to aid phosphoryl group transfer. It is the chelate of the metal and the nucleotide that is the actual substrate.
Activity regulation
Activated by a monovalent cation that binds near, but not in, the active site. The most likely occupant of the site in vivo is potassium. Ion binding induces a conformational change that may alter substrate affinity.
Pathway
Carbohydrate metabolism; D-ribose degradation; D-ribose 5-phosphate from beta-D-ribopyranose: step 2/2.
Features
Showing features for binding site, active site.
Type | ID | Position(s) | Description | ||
---|---|---|---|---|---|
Binding site | 14-16 | substrate | |||
Binding site | 42-46 | substrate | |||
Binding site | 148 | substrate | |||
Binding site | 193 | ATP (UniProtKB | ChEBI) | |||
Binding site | 229-234 | ATP (UniProtKB | ChEBI) | |||
Binding site | 257 | K+ (UniProtKB | ChEBI) | |||
Binding site | 259 | K+ (UniProtKB | ChEBI) | |||
Binding site | 262-263 | ATP (UniProtKB | ChEBI) | |||
Active site | 263 | Proton acceptor | |||
Binding site | 263 | substrate | |||
Binding site | 293 | K+ (UniProtKB | ChEBI) | |||
Binding site | 296 | K+ (UniProtKB | ChEBI) | |||
Binding site | 298 | K+ (UniProtKB | ChEBI) | |||
Binding site | 302 | K+ (UniProtKB | ChEBI) | |||
GO annotations
Aspect | Term | |
---|---|---|
Cellular Component | nucleus | |
Cellular Component | plastid nucleoid | |
Molecular Function | ATP binding | |
Molecular Function | metal ion binding | |
Molecular Function | ribokinase activity | |
Biological Process | D-ribose catabolic process | |
Biological Process | nucleoside metabolic process |
Keywords
- Molecular function
- Biological process
- Ligand
Enzyme and pathway databases
Names & Taxonomy
Protein names
- Recommended nameRibokinase
- EC number
- Short namesRK
Gene names
Organism names
- Strain
- Taxonomic lineageEukaryota > Viridiplantae > Streptophyta > Embryophyta > Bryophyta > Bryophytina > Bryopsida > Funariidae > Funariales > Funariaceae > Physcomitrium
Accessions
- Primary accessionA9T794
Proteomes
Genome annotation databases
PTM/Processing
Proteomic databases
Interaction
Structure
Family & Domains
Features
Showing features for domain.
Type | ID | Position(s) | Description | ||
---|---|---|---|---|---|
Domain | 7-305 | Carbohydrate kinase PfkB | |||
Sequence similarities
Belongs to the carbohydrate kinase PfkB family. Ribokinase subfamily.
Belongs to the carbohydrate kinase pfkB family.
Phylogenomic databases
Family and domain databases
Sequence
- Sequence statusComplete
- Length320
- Mass (Da)33,255
- Last updated2008-02-05 v1
- MD5 Checksum841079B7C0BB426FAD3F98C639226CEA
Keywords
- Technical term
Sequence databases
Nucleotide Sequence | Protein Sequence | Molecule Type | Status | |
---|---|---|---|---|
ABEU02000006 EMBL· GenBank· DDBJ | PNR52516.1 EMBL· GenBank· DDBJ | Genomic DNA |