Proline iminopeptidase PepI overexpressing Lactobacillus casei as an adjunct starter in Edam cheese

Bioengineered. 2013 Nov-Dec;4(6):408-12. doi: 10.4161/bioe.25543. Epub 2013 Jul 12.

Abstract

In this study the growth of genetically modified Lactobacillus casei LAB6, overexpressing proline iminopeptidase PepI and its capacity to increase free proline was investigated during ripening of Edam cheese. The strain successfully survived 12 weeks of ripening period in cheese. The food-grade plasmid pLEB604, carrying the pepI gene, was stable, and PepI enzyme was active in LAB6 cells isolated at different stages of the ripening process. However, HPLC analyses indicated that Lb. casei LAB6 could not increase the amount of free proline in ripened cheese.

Keywords: Edam cheese; PepI; bitterness; proline.

MeSH terms

  • Amino Acids / analysis
  • Aminopeptidases / genetics
  • Aminopeptidases / metabolism*
  • Bacterial Proteins / genetics
  • Bacterial Proteins / metabolism*
  • Cheese / microbiology*
  • Food Handling
  • Food Microbiology*
  • Lacticaseibacillus casei / enzymology*
  • Lacticaseibacillus casei / genetics
  • Plasmids / genetics
  • Taste

Substances

  • Amino Acids
  • Bacterial Proteins
  • Aminopeptidases
  • prolyl aminopeptidase