251. Repurposing conformational changes in ANL superfamily enzymes to rapidly generate biosensors for organic and amino acids.
- Author
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Wang J, Xue N, Pan W, Tu R, Li S, Zhang Y, Mao Y, Liu Y, Cheng H, Guo Y, Yuan W, Ni X, and Wang M
- Subjects
- Ligands, Proteins chemistry, Phenylalanine, Amino Acids, Biosensing Techniques methods
- Abstract
Biosensors are powerful tools for detecting, real-time imaging, and quantifying molecules, but rapidly constructing diverse genetically encoded biosensors remains challenging. Here, we report a method to rapidly convert enzymes into genetically encoded circularly permuted fluorescent protein-based indicators to detect organic acids (GECFINDER). ANL superfamily enzymes undergo hinge-mediated ligand-coupling domain movement during catalysis. We introduce a circularly permuted fluorescent protein into enzymes hinges, converting ligand-induced conformational changes into significant fluorescence signal changes. We obtain 11 GECFINDERs for detecting phenylalanine, glutamic acid and other acids. GECFINDER-Phe3 and GECFINDER-Glu can efficiently and accurately quantify target molecules in biological samples in vitro. This method simplifies amino acid quantification without requiring complex equipment, potentially serving as point-of-care testing tools for clinical applications in low-resource environments. We also develop a GECFINDER-enabled droplet-based microfluidic high-throughput screening method for obtaining high-yield industrial strains. Our method provides a foundation for using enzymes as untapped blueprint resources for biosensor design, creation, and application., (© 2023. Springer Nature Limited.)
- Published
- 2023
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