Staphylococcus aureus physiological growth limitations: insights from flux calculations built on proteomics and external metabolite data

Item Type:	Article
Title:	Staphylococcus aureus physiological growth limitations: insights from flux calculations built on proteomics and external metabolite data
Creators Name:	Liang, C. and Liebeke, M. and Schwarz, R. and Zuehlke, D. and Fuchs, S. and Menschner, L. and Engelmann, S. and Wolz, C. and Jaglitz, S. and Bernhardt, J. and Hecker, M. and Lalk, M. and Dandekar, T.
Abstract:	Comparing proteomics and metabolomics allows insights into Staphylococcus aureus physiological growth. We update genome and proteome information and deliver strain-specific metabolic models for three S. aureus strains (COL, N315, and Newman). We find a number of differences in metabolism and enzymes. Growth experiments (glucose or combined with oxygen limitation) were conducted to measure external metabolites. Fluxes of the central metabolism were calculated from these data with low error. In exponential phase, glycolysis is active and amino acids are used for growth. In later phases, dehydroquinate synthetase is suppressed and acetate metabolism starts. There are strain-specific differences for these phases. A time series of 2-D gel protein expression data on COL strain delivered a second data set (glucose limitation) on which fluxes were calculated. The comparison with the metabolite-predicted fluxes shows, in general, good correlation. Outliers point to different regulated enzymes for S. aureus COL under these limitations. In exponential growth, there is lower activity for some enzymes in upper glycolysis and pentose phosphate pathway and stronger activity for some in lower glycolysis. In transition phase, aspartate kinase is expressed to meet amino acid requirements and in later phases there is high expression of glyceraldehyde-3-phosphate dehydrogenase and lysine synthetase. Central metabolite fluxes and protein expression of their enzymes correlate in S. aureus.
Keywords:	Correlation, Flux Balance Analysis, Metabolism, Microbiology, Protein Expression, Staphylococci
Source:	Proteomics
ISSN:	1615-9853
Publisher:	Wiley
Volume:	11
Number:	10
Page Range:	1915-1935
Date:	May 2011
Official Publication:	https://doi.org/10.1002/pmic.201000151
PubMed:	View item in PubMed

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