Spontaneously established syntrophic yeast communities improve bioproduction

Area of Science:

• Microbiology
• Synthetic Biology
• Biotechnology

Background:

• Nutritional codependence (syntrophy) offers potential for improving biotechnological processes through cooperating cell types.
• Designing yeast syntrophic communities typically requires extensive genetic manipulation due to limited spontaneous cooperative growth among auxotrophs.

Purpose of the Study:

• To systematically screen auxotrophic Saccharomyces cerevisiae deletion mutants for spontaneous syntrophic community formation.
• To characterize the stability and growth dynamics of identified syntrophic cocultures.
• To explore the potential of dividing metabolic pathways within these communities for enhanced production.

Main Methods:

• High-throughput phenotypic screening of pairwise auxotrophic Saccharomyces cerevisiae deletion mutant combinations.
• Characterization of stability and growth dynamics for selected cocultures.
• Introduction of split metabolic pathways into auxotrophic pairs to assess production enhancement.

Main Results:

• Identification of 49 pairwise combinations of auxotrophic Saccharomyces cerevisiae mutants that spontaneously form syntrophic, synergistic communities.
• Demonstration that a tryptophan auxotroph pair exchanges a pathway intermediate for growth, not end products.
• Successful implementation of split malonic semialdehyde biosynthesis pathways, leading to increased production.

Conclusions:

• Spontaneous stable syntrophy can form in Saccharomyces cerevisiae auxotrophs without extensive genetic engineering.
• Dividing labor within cooperating intraspecies communities holds significant biotechnological potential.
• This work provides a foundation for designing more efficient microbial cell factories using natural cooperative interactions.