title: Effect of reducing agents on the acidification capacity and the proton motive force of Lactococcus lactis ssp. cremoris resting cells.
abstract: Reducing agents are potential inhibitors of the microbial growth. We have shown recently that dithiothreitol (DTT), NaBH(4) and H(2) can modify the proton motive force of resting cells of Escherichia coli by increasing the membrane protons permeability [Eur. J. Biochem. 262 (1999) 595]. In the present work, the effect of reducing agents on the resting cells of Lactococcus lactis ssp. cremoris, a species widely employed in dairy processes was investigated. DTT did not affect the acidification nor the DeltapH, in contrast to the effect previously reported on E. coli. The DeltaPsi was slightly increased (30 mV) at low pH (pH 4) in the presence of 31 mM DTT or 2.6 mM NaBH(4). In the case of Na(2)S(2)O(4), small amounts (0.9 mM) drastically decreased the acidification range and this product was shown to abolish the DeltapH. These results are discussed in terms of the diversity of action of the chemical reagents and strain sensitivity.
authors.affiliation: Laboratoire de Microbiologie de l'ENSBANA (UMR INRA-Université de Bourgogne), 1, esplanade Erasme, 21000 Dijon, France. ywache@u-bourgogne.fr
authors.forename: Yves
authors.initials: Y
authors.lastname: Waché
authors.forename: Christophe
authors.initials: C
authors.lastname: Riondet
authors.forename: Charles
authors.initials: C
authors.lastname: Diviès
authors.forename: Rémy
authors.initials: R
authors.lastname: Cachon
mesh_terms: D001894:Borohydrides / Q000378:metabolism / Q000494:pharmacology; D002460:Cell Line; D004227:Dithionite / Q000378:metabolism / Q000494:pharmacology; D004229:Dithiothreitol / Q000378:metabolism / Q000494:pharmacology; D006863:Hydrogen-Ion Concentration; D007399:Interphase / Q000187:drug effects; D019344:Lactic Acid / Q000096:biosynthesis*; D013294:Lactococcus lactis / Q000145:classification / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D018892:Proton-Motive Force / Q000187:drug effects; D019163:Reducing Agents / Q000378:metabolism* / Q000494:pharmacology*; D012680:Sensitivity and Specificity; D013045:Species Specificity
chemical_list: D001894:Borohydrides; D019163:Reducing Agents; D004227:Dithionite; D019344:Lactic Acid; C025364:sodium borohydride; D004229:Dithiothreitol