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Curr Microbiol. 1997 Sep;35(3):175-9.

Glucose and galactose transport in Bifidobacterium bifidum DSM 20082.

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Laboratoire de Chimie Biologique, UMR No. 111 CNRS, Université des Sciences et Technologies de Lille, 59655 Villeneuve d'Ascq cedex, France.


Sugar uptake was measured with 3H-galactose and 14C-glucose. Galactose transport system was not modified by inhibitors of known translocases and did not present a saturation kinetic with high concentration of galactose. Glucose incorporation was inhibited by lasalocid (cation symport inhibitor) and increased by KCl. The kinetic parameters KM and Vmax were respectively 9.16 mM and 26.56 nmol/min/mg cell protein. On the basis of this study, galactose crossed through the membrane by diffusion, and glucose was incorporated by a cation symport which is regulated by K+ ions.

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