Understanding glucose transport by the bacterial phophoenolpyruvate : glycose phosphotransferase system on the basis of kinetic measurments in vitro

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dc.contributor.authorRohwer, Johann M.en_ZA
dc.contributor.authorMeadow, Norman D.en_ZA
dc.contributor.authorRoseman, Saulen_ZA
dc.contributor.authorWesterhoff, Hans V.en_ZA
dc.contributor.authorPostma, Pieter W.en_ZA
dc.date.accessioned2013-01-23T10:11:01Z
dc.date.available2013-01-23T10:11:01Z
dc.date.issued2000
dc.descriptionCITATION: Rohwer, J. M. et al. 2000. Understanding glucose transport by the bacterial phophoenolpyruvate : glycose phosphotransferase system on the basis of kinetic measurments in vitro. Journal of Biological Chemistry, 275(45):34909-34921, doi:10.1074/jbc.M002461200.
dc.descriptionThe original publication is available at https://www.sciencedirect.com
dc.description.abstractThe kinetic parameters in vitro of the components of the phosphoenolpyruvate:glycose phosphotransferase system (PTS) in enteric bacteria were collected. To address the issue of whether the behavior in vivo of the PTS can be understood in terms of these enzyme kinetics, a detailed kinetic model was constructed. Each overall phosphotransfer reaction was separated into two elementary reactions, the first entailing association of the phosphoryl donor and acceptor into a complex and the second entailing dissociation of the complex into dephosphorylated donor and phosphorylated acceptor. Literature data on theK m values and association constants of PTS proteins for their substrates, as well as equilibrium and rate constants for the overall phosphotransfer reactions, were related to the rate constants of the elementary steps in a set of equations; the rate constants could be calculated by solving these equations simultaneously. No kinetic parameters were fitted. As calculated by the model, the kinetic parameter values in vitro could describe experimental results in vivo when varying each of the PTS protein concentrations individually while keeping the other protein concentrations constant. Using the same kinetic constants, but adjusting the protein concentrations in the model to those present in cell-free extracts, the model could reproduce experiments in vitro analyzing the dependence of the flux on the total PTS protein concentration. For modeling conditions in vivo it was crucial that the PTS protein concentrations be implemented at their high in vivo values. The model suggests a new interpretation of results hitherto not understood; in vivo, the major fraction of the PTS proteins may exist as complexes with other PTS proteins or boundary metabolites, whereas in vitro, the fraction of complexed proteins is much smaller.
dc.description.versionPublisher's version
dc.identifier.citationJournal of Biological Chemistry
dc.identifier.issn1083-351X (online)
dc.identifier.urihttp://hdl.handle.net/10019.1/72842
dc.language.isoen
dc.publisherElsevier
dc.rights.holderAuthors retain copyright
dc.subject.otherGlucoseen_ZA
dc.titleUnderstanding glucose transport by the bacterial phophoenolpyruvate : glycose phosphotransferase system on the basis of kinetic measurments in vitroen_ZA
dc.typeArticle
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