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Area of Science:

  • Biotechnology
  • Synthetic Biology
  • Microbial Engineering

Background:

  • Synthetic methylotrophy is key for sustainable biomanufacturing using methanol.
  • Current engineering efforts focus on enzymes and pathways, neglecting cellular tolerance.
  • Improving methanol tolerance is crucial for efficient bioconversion.

Purpose of the Study:

  • To enhance methanol bioconversion in synthetic methylotrophs by improving cellular tolerance.
  • To identify genetic and metabolic adaptations conferring higher methanol tolerance.

Main Methods:

  • Adaptive laboratory evolution of engineered Corynebacterium glutamicum with increasing methanol concentrations.
  • Transcriptome analysis to understand metabolic rebalancing.
  • Genetic analysis to identify key mutations.

Main Results:

  • Evolved strain exhibited significantly higher tolerance to methanol, improved growth, and enhanced methanol utilization.
  • Transcriptome data revealed metabolic shifts including down-regulation of glycolysis and up-regulation of amino acid biosynthesis, oxidative phosphorylation, and ribosome biogenesis.
  • Mutations in O-acetyl-L-homoserine sulfhydrylase (Cgl0653) and a methanol-induced transporter (Cgl0833) were identified as critical for tolerance.

Conclusions:

  • Cellular tolerance engineering is a vital strategy for developing superior synthetic methylotrophs.
  • Metabolic rebalancing and specific gene mutations contribute to enhanced methanol tolerance and utilization.
  • This work provides a foundation for optimizing microbial platforms for methanol-based biomanufacturing.