Role of phosphate in the central metabolism of two lactic acid bacteria

• Verfasst von: Levering, Jennifer [VerfasserIn]
• Verfasst von: Kummer, Ursula [VerfasserIn]
• Titel: Role of phosphate in the central metabolism of two lactic acid bacteria
• Titelzusatz: a comparative systems biology approach
• Verf.angabe: Jennifer Levering, Mark W.J.M. Musters, Martijn Bekker, Domenico Bellomo,Tomas Fiedler, Willem M. de Vos, Jeroen Hugenholtz, Bernd Kreikemeyer, Ursula Kummer and Bas Teusink
• E-Jahr: 2012
• Jahr: 12 March 2012
• Umfang: 17 S.
• Fussnoten: Gesehen am 15.05.2017
• Titel Quelle: Enthalten in: Vereinigung der Europäischen Biochemischen GesellschaftenThe FEBS journal
• Ort Quelle: Oxford [u.a.] : Wiley-Blackwell, 2005
• Jahr Quelle: 2012
• Band/Heft Quelle: 279(2012), 7, Seite 1274-1290
• ISSN Quelle: 1742-4658
• DOI: doi:10.1111/j.1742-4658.2012.08523.x
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: glycolysis
• Sach-SW: kinetic modelling
• Sach-SW: Lactococcus lactis
• Sach-SW: phosphate uptake
• Sach-SW: Streptococcus pyogenes
• K10plus-PPN: 155861852X

Abstract

Lactic acid-producing bacteria survive in distinct environments, but show common metabolic characteristics. Here we studied the dynamic interactions of the central metabolism in Lactococcus lactis, extensively used as a starter culture in the dairy industry, and Streptococcus pyogenes, a human pathogen. Glucose-pulse experiments and enzymatic measurements were performed to parameterize kinetic models of glycolysis. Significant improvements were made to existing kinetic models for L. lactis, which subsequently accelerated the development of the first kinetic model of S. pyogenes glycolysis. The models revealed an important role for extracellular phosphate in the regulation of central metabolism and the efficient use of glucose. Thus, phosphate, which is rarely taken into account as an independent species in models of central metabolism, should be considered more thoroughly in the analysis of metabolic systems in the future. Insufficient phosphate supply can lead to a strong inhibition of glycolysis at high glucose concentrations in both species, but this was more severe in S. pyogenes. S. pyogenes is more efficient at converting glucose to ATP, showing a higher tendency towards heterofermentative energy metabolism than L. lactis. Our comparative systems biology approach revealed that the glycolysis of L. lactis and S. pyogenes have similar characteristics, but are adapted to their individual natural habitats with respect to phosphate regulation. Database The mathematical models described here have been submitted to the Online Cellular Systems Modelling Database and can be accessed at http://jjj.biochem.sun.ac.za/database/Levering/index.html free of charge.