Metatranscriptomics reveals temperature-driven functional changes in microbiome impacting cheese maturation rate

Sci Rep. 2016 Feb 25:6:21871. doi: 10.1038/srep21871.

Abstract

Traditional cheeses harbour complex microbial consortia that play an important role in shaping typical sensorial properties. However, the microbial metabolism is considered difficult to control. Microbial community succession and the related gene expression were analysed during ripening of a traditional Italian cheese, identifying parameters that could be modified to accelerate ripening. Afterwards, we modulated ripening conditions and observed consistent changes in microbial community structure and function. We provide concrete evidence of the essential contribution of non-starter lactic acid bacteria in ripening-related activities. An increase in the ripening temperature promoted the expression of genes related to proteolysis, lipolysis and amino acid/lipid catabolism and significantly increases the cheese maturation rate. Moreover, temperature-promoted microbial metabolisms were consistent with the metabolomic profiles of proteins and volatile organic compounds in the cheese. The results clearly indicate how processing-driven microbiome responses can be modulated in order to optimize production efficiency and product quality.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acids / metabolism
  • Cheese / analysis
  • Cheese / microbiology*
  • Fatty Acids / metabolism
  • Food Microbiology
  • Gas Chromatography-Mass Spectrometry
  • Lactobacillus / genetics
  • Lactobacillus / isolation & purification
  • Lactobacillus / metabolism
  • Microbiota*
  • Principal Component Analysis
  • Pyruvic Acid / metabolism
  • RNA, Ribosomal, 16S / genetics
  • RNA, Ribosomal, 16S / metabolism
  • Sequence Analysis, DNA
  • Solid Phase Microextraction
  • Temperature
  • Volatile Organic Compounds / analysis
  • Volatile Organic Compounds / metabolism

Substances

  • Amino Acids
  • Fatty Acids
  • RNA, Ribosomal, 16S
  • Volatile Organic Compounds
  • Pyruvic Acid