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Topic: ADP hydrolysis to AMP yields the same E as less stable ATP to ADP, why?  (Read 2180 times)

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Offline Qwerius_1

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ADP hydrolysis to AMP yields the same E as less stable ATP to ADP, why?
« on: September 28, 2020, 02:53:05 PM »
I was learning some biochem. and I found out that ADP is more stable that ATP because of intramolecular repulsion of negative charges and because of resonance of ADP.  I then thought that because of this, hydrolysis of ADP to AMP has to yield less energy that that of ATP, but  found out that the ∆G is the same. How is this possible??
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Offline Babcock_Hall

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Re: ADP hydrolysis to AMP yields the same E as less stable ATP to ADP, why?
« Reply #1 on: September 29, 2020, 10:58:54 AM »
Are you familiar with the terminology of phosphoanhydride bond?  Are you familiar with the term high-energy bond?
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Offline Babcock_Hall

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Re: ADP hydrolysis to AMP yields the same E as less stable ATP to ADP, why?
« Reply #2 on: September 30, 2020, 08:02:57 AM »
A high-energy bond is a bond for which the hydrolysis reaction has ΔG°' less than -25 kJ/mol.  Are same factors which make the β,γ bond in ATP a high energy bond also a factor in the α,β bond in ADP?
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