The enzyme is useful for the determination of α-amylase and inorganic phosphate in clinical analysis.
| Origin | recombinant E. coli |
|---|---|
| Systematic name | Maltose : orthophosphate 1-β-D-glucosyltransferase |
| EC Number | 2.4.1.8 |
| Reaction formula | Maltose + Orthophosphate →→→ D-Glucose + β-D-Glucose 1-phosphate |
| Appearance | white lyophilizate | |
|---|---|---|
| Activity | ≧10 U/mg | |
| Stabilizer | lactose, ethylenediaminetetraacetic acid (EDTA) | |
| Storage condition | below -20℃ |
| Molecular weight |
ca. 220 kDa (gel filtration) |
|---|---|
| Structure | 2 subunits of 90 kDa (SDS-PAGE) |
| Michaelis constant |
1.9×10-3M (maltose) |
|
3.4×10-3 M (phosphate) |
|
|
8.3×10-3M (arsenate) |
|
| pH Optimum | 6.5–7.5 |
| pH Stability | 5.5–8.0 |
| Optimum temperature | 45–50°C |
| Thermal stability | below 55℃ |
| Stability (liquid form) | stable at 37℃ for at least one week |
| Stability (powder form) | stable at 30℃ for at least four weeks |
| Inhibitors |
Hg2+，Ag+，Zn2+，Cu2+ |
The enzyme is useful for the determination of α-amylase and inorganic phosphate in clinical analysis.
