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# Energy charge

From Stryer: "MAy reactions in metabolism are controlled by the energy status of the cell. One index of the energy status is the eNergy charge, which is proportional to the mole fraction of ATP plus half the mole fraction of ADP, given that ATP contains two anhydride bonds whereas ADP contains one. Hence the energy charge is defined as:

$\mbox{Energy charge} = \frac{[\mbox{ATP}] + \frac{1}{2} [\mbox{ADP}]} {[\mbox{ATP}] + [\mbox{ADP}] + [\mbox{AMP}]}$