Induction of Lipomyces starkeyi Dextranase

Area of Science:

• Biotechnology
• Enzymology
• Microbial Fermentation

Background:

• Lipomyces starkeyi ATCC 20825 is a mutant strain requiring specific inducers for dextranase production.
• Dextranase enzyme is valuable in various industrial applications, necessitating efficient production methods.

Purpose of the Study:

• To identify the most efficient and commercially viable inducers for dextranase synthesis in L. starkeyi ATCC 20825.
• To optimize induction parameters including inducer type, cell growth phase, and exposure time.

Main Methods:

• Screening of various compounds, including methyl-glucosides and oligosaccharides, for their ability to induce dextranase synthesis.
• Evaluating dextranase production levels at different stages of yeast growth (early vs. late log phase).
• Assessing the impact of inducer exposure duration on enzyme yield.

Main Results:

• Several compounds, including 1-O-beta-methyl-glucopyranoside, dextran, and various isomaltose oligosaccharides, effectively induced dextranase synthesis.
• 1-O-beta-Methyl-glucopyranoside was identified as a gratuitous inducer, meaning it triggers enzyme production without being consumed.
• Maximal enzyme production was achieved after 12 hours of exposure to the inducer, with optimal induction occurring in the early growth phase.
• A consistent saturation concentration of approximately 1 mg of inducer per 2 x 10^8 cells was observed for all tested inducers.

Conclusions:

• 1-O-beta-Methyl-glucopyranoside is a highly effective gratuitous inducer for L. starkeyi ATCC 20825 dextranase production.
• Optimizing induction time (12 hours) and utilizing early-log phase cells significantly enhances enzyme yield.
• These findings provide a foundation for developing cost-effective, large-scale dextranase production processes.