[Effect of glucose and lactose on the utilization of citrate by Lactobacillus casei subsp. rhamnosus ATCC 7469].
The utilization of citrate by Lactobacillus casei subsp. rhamnosus ATCC 7469 in a complex medium containing glucose, lactose or citrate was investigated, as an approach to the question of the transport of this acid and the possible relationship with the production of flavour compounds (diacetyl and acetoin). This lactobacillus uses citrate as an energy source in the absence of carbohydrates. External pH and growth increases when citrate is added to complex medium. The presence of citrate does not affect glucose uptake. L. casei ATCC 7469 possibly uses a transport system for citrate utilization, and citrate uptake seems to be under glucose or lactose control. Lactose only inhibits the entrance of citrate at high concentration while the utilization of this acid was negatively regulated by low glucose concentration.
Benito de Cárdenas
I L
IL
Facultad de Bioquímica, Universidad Nacional de Tucumán, Argentina.
Medina
R
R
Oliver
G
G
D001692:Biological Transport / Q000187:drug effects; D002951:Citrates / Q000378:metabolism*; D019343:Citric Acid; D003470:Culture Media / Q000494:pharmacology; D004734:Energy Metabolism; D005947:Glucose / Q000494:pharmacology*; D006863:Hydrogen-Ion Concentration; D007780:Lacticaseibacillus casei / Q000145:classification / Q000187:drug effects* / Q000378:metabolism; D007785:Lactose / Q000494:pharmacology*; D013045:Species Specificity
D002951:Citrates; D003470:Culture Media; D019343:Citric Acid; D005947:Glucose; D007785:Lactose
Efecto de glucosa y lactosa sobre la utilización de citrato por Lactobacillus casei subsp. rhamnosus ATCC 7469.