The phosphorylation of glucose at carbon #6 by inorganic phosphate (Pi) in solut

Question

The phosphorylation of glucose at carbon #6 by inorganic phosphate (Pi) in solution is endergonic under in intracellular conditions, and is characterized by the following equation:

Glucose + Pi <--> Glucose-6-phosphate + H20 Change in G = 13.8 kJ/mol

The synthesis of ATP from ADP and inorganic phosphate (Pi) in solution

is endergonic under intracellular conditions, and is characterized by the following equation:

ADP+Pi<-->ATP+H20 Change in G = 30.5 kJ/mol

Write a new net thermodynamically coupled reaction equation that describes the synthesis of glucose-6-phosphate using the hydrolysis of ATP to power the reaction

Explanation / Answer

ATP + H2O = ADP + Pi Delta G = -30.5 kJ/mol

Pi + glucose = glucose-6-P + H2O Delta G = +13.8 kJ/mol

Coupled reaction:

ATP + glucose = ADP + glucose-6-P Delta G = +13.8 - -30.5 = -16.7 kJ/mol

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