Q9RQ83 · HIS1_BUCMH
- ProteinATP phosphoribosyltransferase
- GenehisG
- StatusUniProtKB reviewed (Swiss-Prot)
- Amino acids299 (go to sequence)
- Protein existenceInferred from homology
- Annotation score3/5
Function
function
Catalyzes the condensation of ATP and 5-phosphoribose 1-diphosphate to form N'-(5'-phosphoribosyl)-ATP (PR-ATP). Has a crucial role in the pathway because the rate of histidine biosynthesis seems to be controlled primarily by regulation of HisG enzymatic activity.
Catalytic activity
- 1-(5-phospho-beta-D-ribosyl)-ATP + diphosphate = 5-phospho-alpha-D-ribose 1-diphosphate + ATP
Cofactor
Activity regulation
Feedback inhibited by histidine.
Pathway
Amino-acid biosynthesis; L-histidine biosynthesis; L-histidine from 5-phospho-alpha-D-ribose 1-diphosphate: step 1/9.
GO annotations
Aspect | Term | |
---|---|---|
Cellular Component | cytoplasm | |
Molecular Function | ATP binding | |
Molecular Function | ATP phosphoribosyltransferase activity | |
Molecular Function | magnesium ion binding | |
Biological Process | L-histidine biosynthetic process |
Keywords
- Molecular function
- Biological process
- Ligand
Enzyme and pathway databases
Names & Taxonomy
Protein names
- Recommended nameATP phosphoribosyltransferase
- EC number
- Short namesATP-PRT ; ATP-PRTase
Gene names
Organism names
- Taxonomic lineageBacteria > Pseudomonadota > Gammaproteobacteria > Enterobacterales > Erwiniaceae > Buchnera
Accessions
- Primary accessionQ9RQ83
Subcellular Location
PTM/Processing
Features
Showing features for chain.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Chain | PRO_0000151837 | 1-299 | ATP phosphoribosyltransferase | |||
Sequence: MIHNNRLRIVMQKNWKLSSDSKDLLVRCGIKINLCKQKLIAFSENMPIDVMCVRDDDIPGLIMDGIVDIGIIGENVLEEEVLSRKLRLDSVDYIKLKRLDFGVCRLSLAVPIDKEYTDIYCLNNSRIATSYPHLLKKYFDKKNIIFKSCMLNGSVEVAPRAGLSDAICDLVSTGATLEANGLREVQIIFRSKACLICKTGNISVEKQNVINTLMTRIQGVIKARESKYIMLHAPIKKLEEVIDLLHGAERPTILKLAGDDSRVAMHMVSSETLFWETMEKLKLLGASSILVLPIEKMME |
Interaction
Subunit
Equilibrium between an active dimeric form, an inactive hexameric form and higher aggregates. Interconversion between the various forms is largely reversible and is influenced by the natural substrates and inhibitors of the enzyme.
Structure
Sequence
- Sequence statusComplete
- Length299
- Mass (Da)33,710
- Last updated2000-05-01 v1
- Checksum576213A51CEA6D50