THE PEPTASE, LIPASE, AND INVERTASE OF HEMOLYTIC STREPTOCOCCUS

Area of Science:

• Microbiology
• Enzymology
• Biochemistry

Background:

• Hemolytic streptococcus produces various enzymes contributing to its pathogenicity.
• Understanding these enzymes is crucial for developing targeted therapeutic strategies.

Purpose of the Study:

• To outline a method for easy extraction of enzymes from hemolytic streptococcus.
• To characterize the activity and stability of key streptococcal enzymes: peptase, invertase, and lipase.

Main Methods:

• Enzyme extraction from hemolytic streptococcus.
• Assay of peptolytic, invertase, and lipase activity across varying pH and temperature conditions.
• Determination of enzyme susceptibility to chemical agents like chloroform and gentian violet.

Main Results:

• Peptolytic enzyme: active pH 4.4-8.7 (optimum 7.2), heat-labile (57°C/10min), pH-dependent stability, attacks casein but not albumin, inhibited by chloroform and gentian violet.
• Invertase: active pH 5.0-8.0 (optimum 7.0), heat-labile (52°C/10min), more heat-sensitive than peptase at acidic pH.
• Lipase: active above pH 5.6 (optimum 7.9), heat-labile ( >55°C/10min), acid-susceptible.

Conclusions:

• A straightforward method for extracting hemolytic streptococcal enzymes was established.
• Detailed characterization of peptolytic, invertase, and lipase provides insights into their biochemical properties and potential roles in infection.
• Enzyme stability and activity profiles offer targets for antimicrobial interventions.