Directed Evolution of Transcription Factor-Based Biosensors for Altered Effector Specificity

Area of Science:

• Synthetic Biology
• Biotechnology
• Biomedical Engineering

Background:

• Transcription factor-based biosensors are crucial tools in Synthetic Biology.
• They find applications in bioremediation, industrial biotechnology, and biomedical fields for sensing molecules and metabolites.
• Allosteric transcription factors (aTFs) can be engineered to alter effector specificity, enabling the development of new biosensors.

Purpose of the Study:

• To present a general method for the directed evolution of allosteric transcription factors (aTFs).
• To expand the scope of available aTF-based biosensors for detecting natural and nonnatural molecules.

Main Methods:

• Discusses the theory behind library design for directed evolution.
• Details an improved methodology for transformation of combined libraries.
• Utilizes counterselection with fluorescence-activated cell sorting (FACS) to define the experimental search space.

Main Results:

• The described method facilitates the directed evolution of aTFs.
• This process allows for the creation of biosensors with altered effector specificities.
• The approach expands the repertoire of detectable molecules for biosensing applications.

Conclusions:

• Directed evolution of aTFs offers a powerful strategy for developing novel biosensors.
• This methodology enhances the capabilities of biosensors in various scientific and industrial domains.
• The presented techniques provide a framework for advancing biosensor technology.