An overview on fermentation, downstream processing and properties of microbial alkaline proteases

Area of Science:

• Biotechnology
• Enzymology
• Industrial Microbiology

Background:

• Microbial alkaline proteases are vital industrial enzymes, dominating the enzyme market and detergent industry.
• Bacillus species are the primary source of commercially exploited extracellular proteases.
• Understanding fermentation, purification, and biocatalyst properties is essential for industrial enzyme process development.

Purpose of the Study:

• To highlight the importance of microbial alkaline proteases in industry.
• To discuss fermentation parameters, purification strategies, and biocatalyst properties.
• To emphasize the need for updated assay protocols for novel biocatalyst generation.

Main Methods:

• Review of literature on microbial protease production and characterization.
• Discussion of fermentation control (C/N ratio, fed-batch, continuous culture).
• Overview of purification techniques (concentration, chromatography, aqueous two-phase systems).

Main Results:

• Microbial alkaline proteases constitute a major share of the enzyme market, especially in detergents.
• Bacillus sp. are dominant in industrial protease production.
• Alkaline proteases exhibit optimal activity at pH 8-12 and temperatures of 50-70°C, with some exceptions.

Conclusions:

• Efficient industrial enzyme processes require comprehensive knowledge of fermentation, purification, and protease characteristics.
• Development of micro/nano-scale assay protocols is important for generating improved biocatalysts.
• Crystallization aids in understanding the molecular structure and homology of industrially significant proteases.