TABLE 2.
Enzyme reference data collected for prokaryotic extracellular enzymesa
| Enzyme | Size (kDa) | Reaction rate (β) (μmol/liter s−1)b | Source |
|---|---|---|---|
| α-Amylase | 50 | 8.1 | 40 |
| α-Amylase | 55 | 0.1 | 40 |
| α-Glucosidase | 65 | 0.02–2.15 | 66 |
| β-Glucosidase | 50 | 0.00006–2.17 | 67 |
| Alkaline phosphatase | 94 | 1.8–2.5 | 68 |
| Alkaline protease | 26.55 | 107–1,480 | 69 |
| Alkaline (H)protease | 28 | 0.0045–0.13 | 70 |
| Alkaline (N)protease | 27 | 0.0081–0.174 | 70 |
a
The data are not exhaustive; however, to our knowledge, the maximum and minimum size values are close to the boundaries of known prokaryotic extracellular enzymes. The data illustrate the relatively large biological variability in extracellular enzymes.
b
Enzymes with reaction rates in ranges were measured on more than one substrate, and only maximum and minimum values are shown.