Two Uptake Systems for Fructose in Lactococcus lactis subsp. cremoris FD1 Produce Glycolytic and Gluconeogenic Fructose Phosphates and Induce Oscillations in Growth and Lactic Acid Formation Export

@article{citeulike:2407019, abstract = {Fructose transport in lactococci is mediated by two phosphotransferase systems (PTS). The constitutive mannose PTS has a broad specificity and may be used for uptake of fructose with a fructose saturation constant (KFru) of 0.89 mM, giving intracellular fructose 6-phosphate. The inducible fructose PTS has a very small saturation constant (KFru, <17 {micro}M), and the fructose 1-phosphate produced enters the Embden-Meyerhof-Parnas (EMP) pathway as fructose 1,6-diphosphate. Growth in batch cultures of Lactococcus lactis subsp. cremoris FD1 in a yeast extract medium with fructose as the only sugar is poor both with respect to specific growth rate and biomass yield, whereas the specific lactic acid production rate is higher than those in similar fermentations on other sugars metabolized via the EMP pathway, e.g., glucose. In fructose-limited chemostat cultures, the biomass concentration exhibits a strong correlation with the dilution rate, and starting a continuous culture at the end of a batch fermentation leads to large and persistent oscillations in the biomass concentration and specific lactic acid production rate. Two proposed mechanisms underlying this strange growth pattern follow. (i) Fructose transported via the fructose PTS cannot be converted into essential biomass precursors (glucose 6-phosphate or fructose 6-phosphate), because L. lactis subsp. cremoris FD1 is devoid of fructose 1,6-diphosphatase activity. (ii) The fructose PTS apparently produces a metabolite (presumably fructose 1-phosphate) which exerts catabolite repression of both mannose PTS and lactose PTS. Since the repressed mannose PTS and lactose PTS are shown to have identical maximum molar transport rates, the results indicate that it is the general PTS proteins which are repressed.}, author = {Benthin, Stig and Nielsen, Jens and Villadsen, John}, citeulike-article-id = {2407019}, citeulike-linkout-0 = {http://aem.asm.org/cgi/content/abstract/59/10/3206}, citeulike-linkout-1 = {http://view.ncbi.nlm.nih.gov/pubmed/16349061}, citeulike-linkout-2 = {http://www.hubmed.org/display.cgi?uids=16349061}, day = {1}, journal = {Appl. Environ. Microbiol.}, keywords = {acid, fructose, gluconeogenic, glycolytic, growth, lactic, lactis, lactococcus, phosphate, uptake}, month = {October}, number = {10}, pages = {3206--3211}, posted-at = {2008-02-21 14:12:32}, priority = {2}, title = {Two Uptake Systems for Fructose in Lactococcus lactis subsp. cremoris FD1 Produce Glycolytic and Gluconeogenic Fructose Phosphates and Induce Oscillations in Growth and Lactic Acid Formation}, url = {http://aem.asm.org/cgi/content/abstract/59/10/3206}, volume = {59}, year = {1993} }

TY - JOUR ID - citeulike:2407019 L3 - citeulike-article-id:2407019 N2 - Fructose transport in lactococci is mediated by two phosphotransferase systems (PTS). The constitutive mannose PTS has a broad specificity and may be used for uptake of fructose with a fructose saturation constant (KFru) of 0.89 mM, giving intracellular fructose 6-phosphate. The inducible fructose PTS has a very small saturation constant (KFru, <17 {micro}M), and the fructose 1-phosphate produced enters the Embden-Meyerhof-Parnas (EMP) pathway as fructose 1,6-diphosphate. Growth in batch cultures of Lactococcus lactis subsp. cremoris FD1 in a yeast extract medium with fructose as the only sugar is poor both with respect to specific growth rate and biomass yield, whereas the specific lactic acid production rate is higher than those in similar fermentations on other sugars metabolized via the EMP pathway, e.g., glucose. In fructose-limited chemostat cultures, the biomass concentration exhibits a strong correlation with the dilution rate, and starting a continuous culture at the end of a batch fermentation leads to large and persistent oscillations in the biomass concentration and specific lactic acid production rate. Two proposed mechanisms underlying this strange growth pattern follow. (i) Fructose transported via the fructose PTS cannot be converted into essential biomass precursors (glucose 6-phosphate or fructose 6-phosphate), because L. lactis subsp. cremoris FD1 is devoid of fructose 1,6-diphosphatase activity. (ii) The fructose PTS apparently produces a metabolite (presumably fructose 1-phosphate) which exerts catabolite repression of both mannose PTS and lactose PTS. Since the repressed mannose PTS and lactose PTS are shown to have identical maximum molar transport rates, the results indicate that it is the general PTS proteins which are repressed. IS - 10 JF - Appl. Environ. Microbiol. EP - 3211 TI - Two Uptake Systems for Fructose in Lactococcus lactis subsp. cremoris FD1 Produce Glycolytic and Gluconeogenic Fructose Phosphates and Induce Oscillations in Growth and Lactic Acid Formation VL - 59 SP - 3206 KW - acid KW - fructose KW - gluconeogenic KW - glycolytic KW - growth KW - lactic KW - lactis KW - lactococcus KW - phosphate KW - uptake AU - Benthin, Stig AU - Nielsen, Jens AU - Villadsen, John PY - 1993/10/01/ UR - http://aem.asm.org/cgi/content/abstract/59/10/3206 ER -