CATH Classification
| Level | CATH Code | Description |
|---|---|---|
|
3 | Alpha Beta |
|
3.20 | Alpha-Beta Barrel |
|
3.20.20 | TIM Barrel |
|
3.20.20.70 | Aldolase class I |
Domain Context
CATH Clusters
| Superfamily | Aldolase class I |
| Functional Family | Thiamine-phosphate synthase |
Enzyme Information
| 2.5.1.3 |
Thiamine phosphate synthase.
based on mapping to UniProt P39594
(1) 4-amino-2-methyl-5-diphosphomethylpyrimidine + 2-((2R,5Z)-2-carboxy- 4-methylthiazol-5(2H)-ylidene)ethyl phosphate = diphosphate + thiamine phosphate + CO(2). (2) 4-amino-2-methyl-5-diphosphomethylpyrimidine + 2-(2-carboxy-4- methylthiazol-5-yl)ethyl phosphate = diphosphate + thiamine phosphate + CO(2). (3) 4-amino-2-methyl-5-diphosphomethylpyrimidine + 4-methyl-5- (2-phosphono-oxyethyl)thiazole = diphosphate + thiamine phosphate.
-!- The enzyme catalyzes the penultimate reaction in thiamine de novo biosynthesis, condensing the pyrimidine and thiazole components. -!- The enzyme is thought to accept the product of EC 2.8.1.10 as its substrate. -!- However, it has been shown that in some bacteria, such as Bacillus subtilis, an additional enzyme, EC 5.3.99.10 converts that compound into its tautomer 2-(2-carboxy-4-methylthiazol-5-yl)ethyl phosphate, and that it is the latter that serves as the substrate for the synthase. -!- In addition to this activity, the enzyme participates in a salvage pathway, acting on 4-methyl-5-(2-phosphono-oxyethyl)thiazole, which is produced from thiamine degradation products. -!- In yeast this activity is found in a bifunctional enzyme and in the plant Arabidopsis thaliana the activity is part of a trifunctional enzyme.
|
UniProtKB Entries (1)
| P39594 |
THIE_BACSU
Bacillus subtilis subsp. subtilis str. 168
Thiamine-phosphate synthase
|
PDB Structure
| PDB | 3O16 |
| External Links | |
| Method | X-RAY DIFFRACTION |
| Organism | |
| Primary Citation |
Crystal Structure and Kinetic Characterization of Bacillus subtilis Thiamin
Phosphate Synthase with a Carboxylated Thiazole Phosphate
to be published
|