Asparaginase production by human clinical isolates of Vibrio succinogenes

Area of Science:

• Microbiology
• Enzymology

Background:

• Vibrio succinogenes is a bacterium found in various environments.
• Asparaginase is an enzyme with potential therapeutic applications.

Purpose of the Study:

• To characterize asparaginase production in human isolates of Vibrio succinogenes.
• To compare enzyme kinetics and production levels with other strains.

Main Methods:

• Isolation and cultivation of Vibrio succinogenes from human samples.
• Enzymatic assays to determine asparaginase activity and kinetics (Km values).
• Analysis of enzyme induction by ammonium ions and comparison of yields.

Main Results:

• All three human isolates of Vibrio succinogenes demonstrated asparaginase production.
• Apparent Km values for asparaginase ranged from 87 to 320 microM.
• Glutamine hydrolysis rate was minimal (2.8-3.5%) compared to asparagine hydrolysis.
• Asparaginase production was not induced by ammonium ions.
• Enzyme yields were lower than those reported for rumen strains.

Conclusions:

• Human isolates of Vibrio succinogenes possess asparaginase activity with distinct kinetic parameters.
• Factors influencing enzyme production, such as ammonium ions, do not appear to be significant in these isolates.
• Further research may be needed to optimize asparaginase production from these strains for potential applications.