High performance affinity chromatography of Bacillus neutral proteases.

Area of Science:

• Biochemistry
• Enzymology
• Microbiology

Background:

• Bacillus neutral proteases are enzymes with various industrial applications.
• Efficient purification methods are crucial for enzyme characterization and utilization.
• Existing purification techniques can be time-consuming and less efficient.

Purpose of the Study:

• To develop and optimize a rapid and efficient purification method for Bacillus neutral proteases.
• To investigate the use of bacitracin-silica as an affinity medium for protease purification.
• To purify neutral proteases from different Bacillus species.

Main Methods:

• Affinity chromatography using bacitracin-silica as the primary purification medium.
• High-speed chromatography on silica particles (40- to 60-microns).
• Second affinity chromatography step using Sepharose-glycyl-D-phenylalanine for B. stearothermophilus protease concentration.
• Use of isopropanol to prevent enzyme autodigestion during purification.

Main Results:

• Successful purification of Bacillus neutral proteases from B. subtilis, B. polymyxa, and B. stearothermophilus.
• High-speed affinity chromatography yielded 4.9 mg of B. subtilis neutral protease in 1.5 hours.
• Demonstrated the effectiveness of bacitracin-silica for rapid enzyme isolation.
• Further concentration of B. stearothermophilus protease was achieved via a secondary affinity step.

Conclusions:

• Bacitracin-silica affinity chromatography provides a fast and effective method for purifying Bacillus neutral proteases.
• The developed high-speed procedure significantly reduces purification time.
• This method is applicable to neutral proteases from various Bacillus species, facilitating their study and application.