3. What is the ?G°\' for the following reaction, the synthesis of ATP from 1,3-

Question

3. What is the ?G°' for the following reaction, the synthesis of ATP from 1,3- bisphosphoglycerate, catalyzed by phosphoglycerate kinase? Circle the correct answer.

1,3-BPG + ADP ? 3-phosphoglycerate + ATP

(a) -18.5 kJ/mol

(b) +18.5 kJ/mol

(c) -79.5 kJ/mol

(d) -49.0 kJ/mol

(e) +49 kJ/mol

To answer questions 1-4, consult these values for hydrolysis of phosphorylated compounds phosphoenolpyruvate (PEP) pyruvate P 61.9 kJ/mol -30.5 kJ/mol ATP ADP Pi -13.8 kJ/mol glucose-6-phosphate glucose Pi -43.1 kJ/mol creatine phosphate-creatine Pi -9.7 kJ/mol glycerol 3-phosphate glycerol P 1,3-bisphosphoglycerate 3-phosphoglycerate Pi -49.0 kJ/mol

Explanation / Answer

Ans (a) -18.5 kJ/mol

This reaction is a glycolytic reaction catalyzed by phosphoglycerate kinase; however, it can proceed in the reverse direction under cellular conditions that favor gluconeogenesis.

1,3 BPG + ADP = 3-phosphoglycerate + ATP
Go’= -18.5 kJ/mol

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