Suppose the biochemical pathway represented in Equation 5-10a is coupled at its first step to the hydrolysis of ATP to ADP. How would this change the expres- sion for AG of the pathway?
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![AG†
AG
AG
AS B*CD
(5-10a)
in which the AG*s give the standard free-energy change for each step. We
can write the free-energy change for each step:
[B]
А > В:
AGAB = AGÅB + RT 1n
[A]
[C]
AGBC = AGic + RT 1n
[B]
В — С:
(5-10b)
[D]
AGÉD + RT 1n
[C]
С — D:
AGCD =](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F403d5df5-c9a3-47af-a06d-d9770154fd48%2F64fd53ac-473b-4e5a-ac4c-66035dc147f4%2Fom69t5_processed.png&w=3840&q=75)
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- Understanding Enzyme Mechanisms Related to Pyruvate Carboxylase Based on the mechanism for pyruvate carboxylase (Figure 22.3), write reasonable mechanisms for the reactions that follow:If a reaction has a ΔG°′ value of at least −30.5 kJ · mol−1, suffi -cient to drive the synthesis of ATP (ΔG°′ = 30.5 kJ · mol−1), can it still drive the synthesis of ATP in vivo when its ΔG is only −10 kJ · mol−1? Explain.Explain why the coupled reaction ATP → ADP + Pi in the P-class ion pump mechanism does not involve direct hydrolysis of the phosphoanhydride bond.
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