Systematic profiling of ale yeast protein dynamics across fermentation and repitching

Area of Science:

• Microbiology
• Biochemistry
• Genomics

Background:

• Understanding brewing yeast (Saccharomyces cerevisiae) genetics and molecular changes is vital for optimizing fermentation and beer production.
• While Saccharomyces cerevisiae is well-studied, temporal molecular shifts during industrial fermentation remain underexplored.

Purpose of the Study:

• To characterize the genomic and proteomic profiles of an ale yeast strain used in Hefeweizen production.
• To systematically measure proteomic changes across multiple fermentation cycles and identify molecular adaptations.

Main Methods:

• Genomic characterization of a Saccharomyces cerevisiae ale yeast strain.
• Shotgun mass spectrometry was used to quantify protein abundance changes over two fermentation cycles.
• Analysis of protein abundance differences after 14 rounds of serial repitching.

Main Results:

• The yeast strain exhibited typical Saccharomyces cerevisiae ale characteristics.
• Progressive shifts in molecular processes were observed, indicated by protein abundance changes.
• Significant differences in protein abundance were found between early and later fermentation batches, particularly in ergosterol and isobutyraldehyde metabolism pathways.

Conclusions:

• This study provides a valuable proteomics resource for brewing yeast.
• The findings offer insights into yeast proteome dynamics during commercial fermentation.
• The data can guide improvements in fermentation protocols, strain management, and engineering for commercial brewing.