Abstract
Thermodynamic formation constants for the complexes of calcium (389 m −1), magnesium (370 m −1), sodium (87.8 m −1), and potassium (81.4 m −1) with AMP, as determined with ion selective electrodes, are reported. These values are used in conjunction with previously measured ATP- and ADP-metal ion complex formation constants to recalculate the standard free energy maps of several phosphohydrolyase and phosphotransferase reactions. The new constants result in significant changes in the free energy maps.
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