Isolation and identification of tyramine-producing enterococci from human fecal samples

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Lactic acid bacteria (LAB) are recognized as a group of important microorganisms because of their crucial role in food fermentation and their contribution to the maintenance of health homeostasis, as natural inhabitants of the human mucosa. However, the metabolic activities of some strains, such as the ability to synthesize biogenic amines (BAs), can be detrimental to human health. BAs are low molecular weight compounds synthesized by the enzymatic decarboxylation of amino acids. Tyramine, one of the most biologically active BAs, is produced by certain strains of LAB related to food fermentations. Since no data are available as to whether tyramine originates exclusively from food intake, or, like polyamines, could be formed by gut bacteria, this study was focused on the isolation of tyramine-producing LAB from human feces. Different strains of Enterococcus faecium and Enterococcus faecalis able to produce tyramine in culture conditions were isolated.

Les bactéries lactiques constituent un groupe de microorganismes importants à cause de leur rôle crucial dans la fermentation des aliments et de leur contribution au maintien de la santé en colonisant les muqueuses chez l’humain. Cependant, les activités métaboliques de quelques souches, notamment leur capacité de synthétiser des amines biogènes (AB), peuvent être dommageables à la santé humaine. Les AB sont de composés de faible poids moléculaire synthétisés par la décarboxylation enzymatique des acides aminés. La tyramine, une des AB les plus actives biologiquement, est produite par certaines souches de bactéries lactiques associées à la fermentation alimentaire. Puisque aucune donnée n’est disponible à savoir si la tyramine origine exclusivement de l’apport alimentaire ou, comme les polyamines, si elle peut être formée par les bactéries intestinales, cette étude s’est concentrée sur l’isolement de bactéries lactiques produisant de la tyramine dans les fèces chez l’humain. Différentes souches d’Enterococcus faecium et d’Enterococcus faecalis capables de produire la tyramine dans des conditions de culture ont été isolées.

Document Type: Research Article

Publication date: February 1, 2009

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  • Published since 1954, this monthly journal contains new research in the field of microbiology including applied microbiology and biotechnology; microbial structure and function; fungi and other eucaryotic protists; infection and immunity; microbial ecology; physiology, metabolism and enzymology; and virology, genetics, and molecular biology. It also publishes review articles and notes on an occasional basis, contributed by recognized scientists worldwide.
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