@article{2304, keywords = {Carbon, Nitrogen, Saccharomyces cerevisiae, Cluster Analysis, Species Specificity, Escherichia coli Proteins, Escherichia coli K12, Saccharomyces cerevisiae Proteins, Mass Spectrometry, Energy Metabolism, Chromatography, Liquid, Phenylpyruvic Acids}, author = {Matthew Brauer and Jie Yuan and Bryson Bennett and Wenyun Lu and Elizabeth Kimball and David Botstein and Joshua Rabinowitz}, title = {Conservation of the metabolomic response to starvation across two divergent microbes.}, abstract = {
We followed 68 cellular metabolites after carbon or nitrogen starvation of Escherichia coli and Saccharomyces cerevisiae, using a filter-culture methodology that allows exponential growth, nondisruptive nutrient removal, and fast quenching of metabolism. Dynamic concentration changes were measured by liquid chromatography-tandem mass spectrometry and viewed in clustered heat-map format. The major metabolic responses anticipated from metabolite-specific experiments in the literature were observed as well as a number of novel responses. When the data were analyzed by singular value decomposition, two dominant characteristic vectors were found, one corresponding to a generic starvation response and another to a nutrient-specific starvation response that is similar in both organisms. Together these captured a remarkable 72\% of the metabolite concentration changes in the full data set. The responses described by the generic starvation response vector (42\%) included, for example, depletion of most biosynthetic intermediates. The nutrient-specific vector (30\%) included key responses such as increased phosphoenolpyruvate signaling glucose deprivation and increased alpha-ketoglutarate signaling ammonia deprivation. Metabolic similarity across organisms extends from the covalent reaction network of metabolism to include many elements of metabolome response to nutrient deprivation as well.
}, year = {2006}, journal = {Proc Natl Acad Sci U S A}, volume = {103}, pages = {19302-7}, month = {12/2006}, language = {eng}, }