Table 5.
Commercially relevant enzymes produced by thermophilic and alkaliphilic actinobacteria and their potential uses.
| Enzyme | Actinobacteria strains | Optimum temperature and pH | Industrial applications | References |
|---|---|---|---|---|
| Amylase | Thermomonospora viridis TF-35 | 60°C and 6.0 | Detergent | Takahashi et al., 1992 |
| Baking | ||||
| Paper and pulp | ||||
| Thermomonospora curvata | 65°C and 5.5–6.0 | Textile industry | Glymph and Stutzenberger, 1977 | |
| Protease | Saccharomonospora viridis SJ-21 | 70°C and pH 9 | Detergents | Jani et al., 2012 |
| Pharmaceutical | ||||
| Nocardiopsis prasina HA-4 | 55°C and pH 7–10 | Leather | Ningthoujam et al., 2009 | |
| Brewing | ||||
| Keratinase | Actinomadura keratinilytica strain Cpt29 | 70°C and pH 10 | Leather industry | Habbeche et al., 2014 |
| Thermomonospora curvata | 65°C and pH 6 | Pharamaceutical uses | Stutzenberger, 1971 | |
| Xylanase | Thermomonospora fusca | 60°C and 7.0 | Paper and pulp | McCarthy et al., 1985 |
| Baking | ||||
| Kocuria sp. RM1 | 30–85°C and pH 4.5–9 | Animal feed | Krishna et al., 2008 | |
| Streptomyces sp. Ab 106 | 60°C and pH 9.0 | Techapun et al., 2002 | ||
| Acetylxylan esterase | Thermobifida fusca NTU22 | 80°C and 8.0 | Paper and pulp | Yang and Liu, 2008 |
| Dextranase | Streptomyces sp. NK458 | 60°C and 9.0 | Sugar mills | Purushe et al., 2012 |
| Nitrile hydratase | Pseudonocardia thermophila JCM 3095 | Thermostable (50–80°C) | Acrylamide production | Martinez et al., 2014 |
| Laccase | Thermobifida fusca BCRC 19214 | Stable at 50°C and pH 10.0 | Waste treatment | Chen et al., 2013 |
| Textile dye treatment | ||||
| Carbon monoxide dehydrogenase | Streptomyces sp. strain G26 | 69°C | Bioenergy generation | Bell et al., 1988 |
| Biofilters |