Microbial sensors for small molecules: development of a mevalonate biosensor

Area of Science:

• Biotechnology
• Microbiology
• Synthetic Biology

Background:

• Mevalonate is a crucial small molecule in metabolic pathways.
• Quantifying mevalonate is essential for metabolic engineering and drug discovery.
• Existing methods for mevalonate detection can be limited in throughput and scope.

Purpose of the Study:

• To develop a novel biosensor strain for sensitive detection and quantification of mevalonate.
• To enable high-throughput screening (HTS) of metabolic pathways related to mevalonate.
• To provide a versatile platform for quantifying small molecules using auxotrophic reporter strains.

Main Methods:

• Engineered an Escherichia coli auxotroph strain to be dependent on mevalonate.
• Incorporated the green fluorescent protein (GFP) reporter system.
• Developed a mathematical model relating growth rate to mevalonate concentration.

Main Results:

• The biosensor strain accurately reports mevalonate concentration via changes in growth rate.
• The system demonstrated utility for quantitative measurement in extracellular environments.
• The method proved effective for high-throughput screening applications.

Conclusions:

• A novel mevalonate biosensor strain was successfully developed.
• This biosensor facilitates high-throughput screening and quantitative analysis of mevalonate.
• The approach is broadly applicable for quantifying other small molecules using auxotrophic reporter systems.