Artículo
Glutamate uptake in Lactobacillus delbrueckii subsp. bulgaricus CNRZ 208 and its enhancement by a combination of Mn2+ and Mg2+
Fecha de publicación:
17/10/2002
Editorial:
Wiley Blackwell Publishing, Inc
Revista:
Letters in Applied Microbiology
ISSN:
0266-8254
e-ISSN:
1472-765X
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Resumen
Aims: To demonstrate the mechanism of glutamate uptake in the dairy strain Lactobacillus delbrueckii subsp. bulgaricus CNRZ 208, and to characterize key aspects of the system. Methods and Results: Glutamate uptake proceeded via an active transport system requiring an exogenous source of energy. The system also transported aspartate and glutamine. It was unique, with a Kt of 2.8 μmoll-1 and a Vmax of 900 μmol s-1 (g dry weight)-1. The activity was optimal at pH 7.3 and 50°C, was independent of the glutamate charge, and was enhanced by Mn2+ + Mg2+ in combination. Inhibition of the activity by uncouplers and ionophores showed that transport was driven by an ATP-dependent mechanism involving the proton-motive force. This inhibition was partially abolished in the presence of both Mn2+ and Mg2+. Conclusions: We demonstrated for the first time that an active transport system governs the uptake of the essential amino acid glutamate in Lact. delbrueckii subsp. bulgaricus CNRZ 208, the activity of which is enhanced by a combination of Mn2+ and Mg2+. Significance and Impact of the Study: The potential of the findings is discussed with reference to the growth of Lact. delbrueckii subsp. bulgaricus in mixed-strain cultures for the dairy industry.
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Articulos(CERELA)
Articulos de CENTRO DE REFERENCIA PARA LACTOBACILOS (I)
Articulos de CENTRO DE REFERENCIA PARA LACTOBACILOS (I)
Citación
Savoy, Graciela; Foucaud-Scheunemann, Catherine; Ferchichi, Mohamed; Hemme, Denis; Glutamate uptake in Lactobacillus delbrueckii subsp. bulgaricus CNRZ 208 and its enhancement by a combination of Mn2+ and Mg2+; Wiley Blackwell Publishing, Inc; Letters in Applied Microbiology; 35; 5; 17-10-2002; 428-432
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