Enzyme allocation problems in kinetic metabolic networks: Optimal solutions are elementary flux modes

0441169 - ÚVGZ 2015 RIV GB eng J - Článek v odborném periodiku
Müller, Stefan - Regensburger, G. - Steuer, Ralf
Enzyme allocation problems in kinetic metabolic networks: Optimal solutions are elementary flux modes.
Journal of Theoretical Biology. Roč. 347, APR 2014 (2014), s. 182-190. ISSN 0022-5193. E-ISSN 1095-8541
Grant CEP: GA MŠMT(CZ) EE2.3.20.0256
Institucionální podpora: RVO:67179843
Klíčová slova: metabolic optimization * enzyme kinetics * oriented matroid * elementary vector * conformal sum
Kód oboru RIV: EI - Biotechnologie a bionika
Impakt faktor: 2.116, rok: 2014

The survival and proliferation of cells and organisms require a highly coordinated allocation of cellular resources to ensure the efficient synthesis of cellular components. In particular, the total enzymatic capacity for cellular metabolism is limited by finite resources that are shared between all enzymes, such as cytosolic space, energy expenditure for amino-acid synthesis, or micro-nutrients. While extensive work has been done to study constrained optimization problems based only on stoichiometric information, mathematical results that characterize the optimal flux in kinetic metabolic networks are still scarce. Here, we study constrained enzyme allocation problems with general kinetics, using the theory of oriented matroids. We give a rigorous proof for the fact that optimal solutions of the non-linear optimization problem are elementary flux modes. This finding has significant consequences for our understanding of optimality in metabolic networks as well as for the identification of metabolic switches and the computation of optimal flux distributions in kinetic metabolic networks
Trvalý link: http://hdl.handle.net/11104/0244223