"Multiagent" Screening Improves Directed Enzyme Evolution by Identifying Epistatic Mutations.

Area of Science:

• Biotechnology
• Synthetic Biology
• Enzyme Engineering

Background:

• Enzyme evolution is crucial for biotechnology and synthetic biology.
• Identifying optimal enzyme variants requires extensive screening due to epistatic mutations.
• Epistatic mutations enhance enzyme activity only in specific combinations, complicating optimization.

Purpose of the Study:

• To develop a more efficient method for enzyme engineering.
• To overcome the challenges posed by epistatic mutations in enzyme evolution.
• To accelerate the identification of improved enzyme sequences.

Main Methods:

• Incorporating diverse substrate analogues into the screening process.
• Utilizing multiple substrates to navigate the enzyme fitness landscape.
• Engineering a malonyl-CoA synthetase as a model system.

Main Results:

• Identified numerous epistatic mutations that improve enzyme activity across diverse substrates.
• Demonstrated that screening with single substrates would miss many beneficial mutations.
• Validated the effectiveness of the substrate analogue approach in enzyme engineering.

Conclusions:

• The substrate analogue approach efficiently identifies epistatic mutations crucial for enzyme improvement.
• This method significantly accelerates enzyme engineering programs compared to traditional screening.
• The approach offers a powerful tool for advancing biotechnology and synthetic biology.