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Title

Lactose-mediated carbon catabolite repression of putrescine production in dairy Lactococcus lactis is strain dependent

AuthorsRío Lagar, Beatriz del ; Ladero Losada, Víctor Manuel ; Redruello, Begoña ; Linares, Daniel M. ; Fernández García, María ; Martín, M. Cruz ; Álvarez González, Miguel Ángel
KeywordsLactococcus lactis
CCR
AGDI pathway
Putrescine
Lactose
Biogenic amines
Issue DateJun-2015
PublisherElsevier
CitationFood Microbiology 48: 163-170 (2015)
Abstract© 2014 Elsevier Ltd. Lactococcus lactis is the lactic acid bacterial (LAB) species most widely used as a primary starter in the dairy industry. However, several strains of L. lactis produce the biogenic amine putrescine via the agmatine deiminase (AGDI) pathway. We previously reported the putrescine biosynthesis pathway in L. lactis subsp. cremoris GE2-14 to be regulated by carbon catabolic repression (CCR) via glucose but not lactose (Linares et al., 2013). The present study shows that both these sugars repress putrescinebiosynthesis in L. lactis subsp. lactis T3/33, a strain isolated from a Spanish artisanal cheese. Furthermore, we demonstrated that both glucose and lactose repressed the transcriptional activity of the aguBDAC catabolic genes of the AGDI route. Finally, a screening performed in putrescine-producing dairy L. lactis strains determined that putrescine biosynthesis was repressed by lactose in all the L. lactis subsp. lactis strains tested, but in only one L. lactis subsp. cremoris strain. Given the obvious importance of the lactoserepression in cheese putrescine accumulation, it is advisable to consider the diversity of L. lactis in this sense and characterize consequently the starter cultures to select the safest strains.
Publisher version (URL)http://dx.doi.org/10.1016/j.fm.2014.11.018
URIhttp://hdl.handle.net/10261/124804
DOI10.1016/j.fm.2014.11.018
Identifiersdoi: 10.1016/j.fm.2014.11.018
issn: 0740-0020
Appears in Collections:(IPLA) Artículos
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