Lactococcus lactis

Comparative Systems Biology: Lactic Acid Bacteria

L. lactis was grown in LAB medium or rich THY medium, strongly concentrated and glucose-pulsed in a MES buffer. Intracellular metabolite concentration is followed in time.

Measurements on Km, Vmax and allosteric activation or inhibition of the main L-lactate dehydrogenase

Lumped kinetic model of L. lactis glycolysis, formulated with ordinary differential equations. Simulations are in line with experimental data

L. lactis, E. faecalis and S. pyogenes are referred to as LAB because of the fact that in the presence of glucose lactate is produced as the main fermentation product . This metabolic pathway is relatively inefficient, since only 2 ATP are generated from one glucose molecule. All three LAB possess the genetic make up for mixed acid fermentation, a more effective way of fermentation generating 3 ATP per molecule of glucose. All three genomes reveal (at least) two genes encoding a lactate dehydrogenase ...

L. lactis, S. pyogenes and E. faecalis were grown in C-limited chemostat cultures at various pH's and dilution rates. General flux distribution, yields and other physiological factors were studied.

Despite high similarity in sequence and catalytic properties, the L-lactate dehydrogenases (LDH) in lactic acid bacteria (LAB) display differences in their regulation which may arise from their adaptation to different habitats. We combined experimental and computational approaches to investigate the effects of fructose-1,6-bisphosphate (FBP), phosphate (Pi) and ionic strength (NaCl concentration) on 6 LDHs from 4 LABs studied at pH 6 and pH 7. We find: (1) The extent of activation by FBP (Kact) ...

Here is a kinetic model (in COPASI format) of L. lactis glycolysis.

SBML description of L. lactis glycolysis. Same as the uploaded Copasi file

Batch and chemostat model of L lactis. Scope of the model is to provide a mechanistic explanation of the switch between mixed acid and homolactic fermentation.

The principles of Stealthy Engineering (Adamczyk et al.: Biotechnology Journal 2012; 7(7):877-83) are illustrated in this model by emulating a cross engineering intervention between L. lactis and S. cerevisiae.

The case study consists of replacing the native glucose uptake system of L. lactis with that native to the yeast S. cerevisiae. A modified version of Hoefnagel et al.’s model of L. lacrtis’ central metabolism was used as starting point. The total functional replacement of the PTS with the ...

The kinetic model includes sugar uptake, degradation of glucose into pyruvate and the fermentation of pyruvate.