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Uptake of glutamic acid by Streptococcus salivarius subsp. thermophilus CNRZ 302

Published online by Cambridge University Press:  01 June 2009

Patrice Bracquart
Affiliation:
Laboratory of Applied Biochemistry (INRA-associated laboratory), University of Nancy I, BP 239, 54506 Vandoeuvre-les-Nancy Cedex, France
Jean-Yves Le Deaut
Affiliation:
Laboratory of Applied Biochemistry (INRA-associated laboratory), University of Nancy I, BP 239, 54506 Vandoeuvre-les-Nancy Cedex, France
Guy Linden
Affiliation:
Laboratory of Applied Biochemistry (INRA-associated laboratory), University of Nancy I, BP 239, 54506 Vandoeuvre-les-Nancy Cedex, France

Summary

Glutamic acid uptake in Streptococcus salivarius subsp. thermophilus was energy dependent, the source of energy and adaptation to sugar being important to efficiency of uptake. The disaccharides, lactose and sucrose, stimulated uptake, but cells grown in glucose were more active. Optimum temperature was ˜ 40 °C and pH ˜ 7·0. NaCl was strongly inhibitory to the uptake of glutamic acid although not to that of isoleucine. High specificity existed because only L-aspartic acid was inhibitory.

Type
Original Articles
Copyright
Copyright © Proprietors of Journal of Dairy Research 1989

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