CATH Classification
| Level | CATH Code | Description |
|---|---|---|
|
3 | Alpha Beta |
|
3.90 | Alpha-Beta Complex |
|
3.90.1170 | Aldehyde Oxidoreductase; domain 3 |
|
3.90.1170.20 | Quinolinate phosphoribosyl transferase, N-terminal domain |
Domain Context
CATH Clusters
| Superfamily | Quinolinate phosphoribosyl transferase, N-terminal domain |
| Functional Family |
Enzyme Information
| 6.3.4.21 |
Nicotinate phosphoribosyltransferase.
based on mapping to UniProt Q9HJ28
Nicotinate + 5-phospho-alpha-D-ribose 1-diphosphate + ATP + H(2)O = beta- nicotinate D-ribonucleotide + diphosphate + ADP + phosphate.
-!- The enzyme, which is involved in pyridine nucleotide recycling, can form beta-nicotinate D-ribonucleotide and diphosphate from nicotinate and 5-phospho-alpha-D-ribose 1-diphosphate (PRPP) in the absence of ATP. -!- However, when ATP is available the enzyme is phosphorylated resulting in a much lower K(m) for nicotinate. -!- The phospho-enzyme is hydrolyzed during the transferase reaction, regenerating the low affinity form. -!- The presence of ATP shifts the products/substrates equilibrium from 0.67 to 1100. -!- Formerly EC 2.4.2.11.
|
UniProtKB Entries (1)
| Q9HJ28 |
PNCB_THEAC
Thermoplasma acidophilum DSM 1728
Putative nicotinate phosphoribosyltransferase
|
PDB Structure
| PDB | 1YTE |
| External Links | |
| Method | X-RAY DIFFRACTION |
| Organism | Escherichia |
| Primary Citation |
Crystal structure of a nicotinate phosphoribosyltransferase from Thermoplasma acidophilum.
J.Biol.Chem.
|
