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Researchers developed novel biosensors to detect one-carbon (C1) compounds like formate, formaldehyde, and methanol. This breakthrough enables high-throughput screening of enzymes crucial for C1 gas assimilation and valuable chemical synthesis.

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Area of Science:

  • Microbiology
  • Biotechnology
  • Synthetic Biology

Background:

  • Microbial assimilation of one-carbon (C1) gases is vital for producing valuable chemicals.
  • Existing C1 gas assimilation studies lack high-throughput enzyme evolution due to limited analytical tools for C1 metabolites.

Purpose of the Study:

  • To develop a single-cell-level biosensor system for efficient analysis of C1 metabolites.
  • To enable high-throughput evolution studies of key enzymes in C1 assimilation pathways.

Main Methods:

  • Engineered genetic enzyme screening systems (GESSs) were developed: FA-GESS for formate, Frm-GESS for formaldehyde, and MeOH-GESS for methanol.
  • These systems combine transcription factors (TFs) with C1-converting enzymes to generate TF ligands.
  • Biosensors were validated for linearity, specificity, and detection ranges.

Main Results:

  • The developed biosensors (FA-GESS, Frm-GESS, MeOH-GESS) showed linear responses to formate (1.0-250 mM), formaldehyde (1.0-50 μM), and methanol (5-400 mM).
  • High specificity was achieved for each C1 molecule.
  • New versatile combinations of C1-biosensors were created using helper enzymes like formaldehyde and methanol dehydrogenase.

Conclusions:

  • The novel GESSs provide an efficient analytical tool for C1 metabolites, overcoming previous limitations.
  • This advancement facilitates high-throughput enzyme evolution for C1 assimilation pathways.
  • The developed biosensor system broadens the detection capabilities for C1 compounds, supporting the synthesis of valuable chemicals.