Lactobacillus rossiae strain isolated from sourdough produces putrescine from arginine

Beatriz Del Rio, Patricia Alvarez-Sieiro, Begoña Redruello, María Cruz Martin, María Fernandez, Victor Ladero, Miguel A Alvarez

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Abstract

This work reports a Lactobacillus rossiae strain (L. rossiae D87) isolated from sourdough that synthesizes putrescine - a biogenic amine that raises food safety and spoilage concerns - from arginine via the ornithine decarboxylase (ODC) pathway. The odc and potE genes were identified and sequenced. These genes respectively encode ornithine decarboxylase (Odc), which participates in the decarboxylation of ornithine to putrescine, and the ornithine/putrescine exchanger (PotE), which exchanges ornithine for putrescine. Transcriptional analysis showed that odc and potE form an operon that is regulated transcriptionally by ornithine in a dose-dependent manner. To explore the possible role of the ODC pathway as an acid stress resistance mechanism for this bacterium, the effect of acidic pHs on its transcriptional regulation and on putrescine biosynthesis was analysed. Acidic pHs induced the transcription of the odc-potE genes and the production of putrescine over that seen at neutral pH. Further, putrescine production via the ODC system improved the survival of L. rossiae D87 by counteracting the acidification of the cytoplasm when the cells were subjected to acidic conditions. These results suggest the ODC pathway of L. rossiae D87 provides a biochemical defence mechanism against acidic environments.

Original languageEnglish
Article number3989
Number of pages10
JournalScientific Reports
Volume8
Issue number1
DOIs
Publication statusPublished - 5-Mar-2018
Externally publishedYes

Keywords

  • LACTIC-ACID BACTERIA
  • BIOSYNTHESIS GENE-CLUSTER
  • BIOGENIC-AMINES
  • ORNITHINE-DECARBOXYLASE
  • TRANSCRIPTIONAL ANALYSIS
  • LACTOCOCCUS-LACTIS
  • TYRAMINE
  • PH
  • EXPRESSION
  • PCR

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