Rational Design and Model Predictions for Optimized Elastase Production in Saccharomyces cerevisiae

Area of Science:

• Biotechnology
• Microbial Engineering
• Enzyme Production

Background:

• Pseudomonas aeruginosa elastase is a valuable metalloprotease with industrial applications.
• Production challenges arise from its pathogenic origin and complex protein folding.
• Saccharomyces cerevisiae (yeast) offers potential as a host for heterologous protein expression.

Purpose of the Study:

• To engineer improved variants of Pseudomonas aeruginosa elastase in Saccharomyces cerevisiae.
• To utilize systems biology and rational design for enhanced protease production.
• To identify genetic targets for optimizing yeast cell factory performance.

Main Methods:

• Rational design targeting nonfunctional elastase regions (propeptide, signal peptide cleavage, N-glycosylation).
• Integration of the yeast protein secretory model (pcSecYeast) with production characteristics.
• Identification and validation of 75 genetic targets through model prediction and production feature analysis.
• Gene overexpression (POS5) and knockout (TES1, VPS10) strategies.

Main Results:

• Development of several engineered elastase variants with improved properties.
• Overexpression of POS5 resulted in a 2.43-fold increase in protease activity.
• Knockout of TES1 or VPS10 genes further optimized elastase production.
• Validation of 75 genetic targets for enhanced protease yield.

Conclusions:

• Systems biology is effective for developing yeast cell factories for protease production.
• Saccharomyces cerevisiae is a versatile host for biotechnological applications, including enzyme manufacturing.
• Engineered elastase variants show significant potential for industrial use.