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Author Spotlight: Exploring the Fermentation Microbiome Through Next-Generation Sequencing
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Microbial interactions shape cheese flavour formation.

Chrats Melkonian1,2,3, Francisco Zorrilla4, Inge Kjærbølling5

  • 1Bioinformatics & Modeling, R&D Digital Innovation, Chr. Hansen A/S, 2970, Hørsholm, Denmark. chrats.melkonian@gmail.com.

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This summary is machine-generated.

Microbial interactions are key to cheese flavor. Streptococcus thermophilus boosts Lactococcus growth and flavor compounds, while Lactococcus cremoris prevents off-flavors, revealing complex roles in Cheddar production.

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Area of Science:

  • Food Microbiology
  • Biochemistry
  • Dairy Science

Background:

  • Cheese flavor arises from complex microbial biochemical reactions.
  • Starter cultures, including Streptococcus thermophilus and Lactococcus, drive Cheddar cheese production.
  • Understanding microbial interactions is crucial for optimizing cheese flavor.

Purpose of the Study:

  • To investigate the specific roles of microbial interactions in Cheddar cheese flavor formation.
  • To elucidate the contribution of Streptococcus thermophilus and Lactococcus strains to flavor development.
  • To identify mechanisms by which microbes influence flavor compound profiles.

Main Methods:

  • Experimental fermentation with selective omission of starter culture strains.
  • Genomic and genome-scale metabolic modeling analyses.
  • Metatranscriptomics to study gene expression during fermentation.

Main Results:

  • Streptococcus thermophilus significantly enhances Lactococcus growth and alters flavor compound profiles.
  • S. thermophilus proteolytic activity alleviates nitrogen limitation and boosts nucleotide synthesis for Lactococcus.
  • Lactococcus cremoris limits off-flavor compounds (diacetyl, acetoin) by re-routing citrate metabolism.
  • Strain-specific interactions between Lactococcus lactis and S. thermophilus were observed.

Conclusions:

  • Cooperative and competitive microbial interactions are essential for shaping cheese flavor.
  • Streptococcus thermophilus plays a critical role in flavor development and microbial synergy.
  • Lactococcus strains contribute to flavor control through specific metabolic activities.
  • Strain specificity is a significant factor in microbial interactions during cheese making.