Development of a Biosensor Platform for Phenolic Compounds Using a Transition Ligand Strategy.

Area of Science:

• Biotechnology
• Molecular Biology
• Synthetic Biology

Background:

• Characterizing protein and microbial strains for biocatalyst development is slow and labor-intensive.
• Transcriptional biosensors enable rapid screening of numerous variants, but specificity is often limited by available transcriptional regulators.

Purpose of the Study:

• To present a novel method for rapidly engineering biosensor specificities.
• To overcome the challenge of limited transcriptional regulators for desired molecules.

Main Methods:

• A two-step semirational transition ligand approach combined with fluorescence-activated cell sorting.
• Initial evolution for relaxed ligand specificity, followed by directed evolution for high specificity.

Main Results:

• Successfully developed highly specific biosensors for 4-hydroxybenzoic acid, p-coumaric acid, 5-bromoferulic acid, and 6-methyl salicylic acid.
• Demonstrated the ability to engineer specificity starting from a biosensor for trans-cinnamic acid.

Conclusions:

• The presented approach enables rapid engineering of biosensor specificities.
• This method accelerates the development of high-performance biocatalysts by overcoming limitations in biosensor design.