Q6N7S7 · XGPT_RHOPA
- ProteinXanthine-guanine phosphoribosyltransferase
- Genegpt
- StatusUniProtKB reviewed (Swiss-Prot)
- Amino acids173 (go to sequence)
- Protein existenceInferred from homology
- Annotation score4/5
Function
function
Purine salvage pathway enzyme that catalyzes the transfer of the ribosyl-5-phosphate group from 5-phospho-alpha-D-ribose 1-diphosphate (PRPP) to the N9 position of the 6-oxopurines guanine and xanthine to form the corresponding ribonucleotides GMP (guanosine 5'-monophosphate) and XMP (xanthosine 5'-monophosphate), with the release of PPi. To a lesser extent, also acts on hypoxanthine.
Catalytic activity
- diphosphate + GMP = 5-phospho-alpha-D-ribose 1-diphosphate + guanineThis reaction proceeds in the backward direction.
- diphosphate + IMP = 5-phospho-alpha-D-ribose 1-diphosphate + hypoxanthineThis reaction proceeds in the backward direction.
Cofactor
Pathway
Purine metabolism; GMP biosynthesis via salvage pathway; GMP from guanine: step 1/1.
Purine metabolism; XMP biosynthesis via salvage pathway; XMP from xanthine: step 1/1.
Features
Showing features for binding site.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Binding site | 48-49 | 5-phospho-alpha-D-ribose 1-diphosphate (UniProtKB | ChEBI) | ||||
Sequence: RG | ||||||
Binding site | 107-115 | 5-phospho-alpha-D-ribose 1-diphosphate (UniProtKB | ChEBI) | ||||
Sequence: DDLVDTGKT | ||||||
Binding site | 108 | Mg2+ (UniProtKB | ChEBI) | ||||
Sequence: D | ||||||
Binding site | 111 | guanine (UniProtKB | ChEBI) | ||||
Sequence: D | ||||||
Binding site | 111 | xanthine (UniProtKB | ChEBI) | ||||
Sequence: D | ||||||
Binding site | 111-115 | GMP (UniProtKB | ChEBI) | ||||
Sequence: DTGKT | ||||||
Binding site | 153-154 | GMP (UniProtKB | ChEBI) | ||||
Sequence: WI | ||||||
Binding site | 154 | guanine (UniProtKB | ChEBI) | ||||
Sequence: I | ||||||
Binding site | 154 | xanthine (UniProtKB | ChEBI) | ||||
Sequence: I |
GO annotations
Aspect | Term | |
---|---|---|
Cellular Component | plasma membrane | |
Molecular Function | guanine phosphoribosyltransferase activity | |
Molecular Function | hypoxanthine phosphoribosyltransferase activity | |
Molecular Function | magnesium ion binding | |
Molecular Function | xanthine phosphoribosyltransferase activity | |
Biological Process | GMP salvage | |
Biological Process | purine ribonucleoside salvage | |
Biological Process | XMP salvage |
Keywords
- Molecular function
- Biological process
- Ligand
Enzyme and pathway databases
Names & Taxonomy
Protein names
- Recommended nameXanthine-guanine phosphoribosyltransferase
- EC number
- Short namesXGPRT
- Alternative names
Gene names
Organism names
- Strain
- Taxonomic lineageBacteria > Pseudomonadota > Alphaproteobacteria > Hyphomicrobiales > Nitrobacteraceae > Rhodopseudomonas
Accessions
- Primary accessionQ6N7S7
Subcellular Location
UniProt Annotation
GO Annotation
Cell inner membrane ; Peripheral membrane protein
Keywords
- Cellular component
PTM/Processing
Features
Showing features for chain.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Chain | PRO_0000139682 | 1-173 | Xanthine-guanine phosphoribosyltransferase | |||
Sequence: MTQSEPTEQKRAGRPFPVSWDQFHRDCRALSWRLNELGPFHAVIAITRGGLVPAAIVARELGLRVIDTVCIASYEHDKQGELQVLKGVSDQTATLGGGTGKGLLIIDDLVDTGKTGRMVRSMLPDAHFAAVYAKPKGRPLVDTFITEVSQDTWIFFPWDTGLSFQPPLKDGAG |
Interaction
Structure
Sequence
- Sequence statusComplete
- Length173
- Mass (Da)18,917
- Last updated2005-12-20 v2
- Checksum5A29A210C4882932
Sequence caution
Sequence databases
Nucleotide Sequence | Protein Sequence | Molecule Type | Status | |
---|---|---|---|---|
BX572600 EMBL· GenBank· DDBJ | CAE27620.1 EMBL· GenBank· DDBJ | Genomic DNA | Different initiation |