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Appl. Environ. Microbiol., Jun 1996, 1922-1927, Vol 62, No. 6
R Lauret, F Morel-Deville, F Berthier, M Champomier-Verges, P Postma, SD Ehrlich and M Zagorec
The ability of Lactobacillus sake to use various carbon sources was
investigated. For this purpose we developed a chemically defined medium
allowing growth of L. sake and some related lactobacilli. This medium was
used to determine growth rates on various carbohydrates and some
nutritional requirements of L. sake. Mutants resistant to 2-deoxy-d-glucose
(a nonmetabolizable glucose analog) were isolated. One mutant unable to
grow on mannose and one mutant deficient in growth on mannose, fructose,
and sucrose were studied by determining growth characteristics and
carbohydrate uptake and phosphorylation rates. We show here that sucrose,
fructose, mannose, N-acetylglucosamine, and glucose are transported and
phosphorylated by the phosphoenolpyruvate:carbohydrate phosphotransferase
system (PTS). The PTS permease specific for mannose, enzyme II(supMan), was
shown to be responsible for mannose, glucose, and N-acetylglucosamine
transport. A second, non-PTS system, which was responsible for glucose
transport, was demonstrated. Subsequent glucose metabolism involved an
ATP-dependent phosphorylation. Ribose and gluconate were transported by
PTS-independent permeases.
Copyright © 1996, American Society for Microbiology
Carbohydrate Utilization in Lactobacillus sake
Laboratoire de Recherches sur la Viande and Laboratoire de Genetique Microbienne, Institut National de la Recherche Agronomique, Domaine de Vilvert, 78350 Jouy en Josas, France, and E. C. Slater Institute, University of Amsterdam, 1018 TV Amsterdam, The Netherlands
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