Energy Balance Analysis Reference Paper: Beard et al. Energy Balance for Analysis of Complex Metabolic Networks. Biophysical Journal 83, 79-86 (2002) Presented.

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Presentation transcript:

Energy Balance Analysis Reference Paper: Beard et al. Energy Balance for Analysis of Complex Metabolic Networks. Biophysical Journal 83, (2002) Presented by Tony

The Basic Idea Mass conservation (FBA) is not enough. More thermodynamic constraints:  Chemical potential balance (First law of thermodynamics)  Positive entropy change for each reaction (Second law of thermodynamics)

Null Space Vectors of S  Stoicheiometric matrix after combining redundant fluxes and removing the columns that correspond to boundary fluxes.  Null space vectors of S. n is the nullity of S

Global Potential Energy Balance  Chemical potential differences associated with the reaction fluxes.

Positive Entropy Production or

Application #1: 5-reaction model TABLE 1 Comparison of fluxes predicted by FBA and EBA for the example system illustrated in Fig. 2 Identifier FBAFBA/EBAFBAFBA/EBAFBAFBA/EBA Reaction Reaction Reaction Reaction Reaction Input of A Input of B Input of C Output of D111133

Application #2: E.coli Model Same optimal growth rate One particular optimal solution to FBA

Estimation of Reaction Potentials