Constant Growth Rate Can Be Supported by Decreasing Energy Flux and Increasing Aerobic Glycolysis

 Title: Constant Growth Rate Can Be Supported by Decreasing Energy Flux and Increasing Aerobic Glycolysis Author: Slavov, Nikolai; Budnik, Bogdan; Schwab, David; Airoldi, Edoardo Maria; van Oudenaarden, Alexander Note: Order does not necessarily reflect citation order of authors. Citation: Slavov, Nikolai, Bogdan A. Budnik, David Schwab, Edoardo M. Airoldi, and Alexander van Oudenaarden. 2014. “Constant Growth Rate Can Be Supported by Decreasing Energy Flux and Increasing Aerobic Glycolysis.” Cell Reports 7 (3) (May): 705–714. doi:10.1016/j.celrep.2014.03.057. Full Text & Related Files: 2014_Slavov_Cell.pdf (1.245Mb; PDF) Abstract: Fermenting glucose in the presence of enough oxygen to support respiration, known as aerobic glycolysis, is believed to maximize growth rate. We observed increasing aerobic glycolysis during exponential growth, suggesting additional physiological roles for aerobic glycolysis. We investigated such roles in yeast batch cultures by quantifying $$O_2$$ consumption, $$CO_2$$ production, amino acids, mRNAs, proteins, posttranslational modifications, and stress sensitivity in the course of nine doublings at constant rate. During this course, the cells support a constant biomass-production rate with decreasing rates of respiration and ATP production but also decrease their stress resistance. As the respiration rate decreases, so do the levels of enzymes catalyzing rate-determining reactions of the tricarboxylic-acid cycle (providing NADH for respiration) and of mitochondrial folate-mediated NADPH production (required for oxidative defense). The findings demonstrate that exponential growth can represent not a single metabolic/physiological state but a continuum of changing states and that aerobic glycolysis can reduce the energy demands associated with respiratory metabolism and stress survival. Published Version: doi:10.1016/j.celrep.2014.03.057 Terms of Use: This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#LAA Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:15178065 Downloads of this work: