\"Why do some books state that the standard free energy for the hydrolysis of th
ID: 189950 • Letter: #
Question
"Why do some books state that the standard free energy for the hydrolysis of the gamma-phosphate group (the one furthest from the ribose) of ATP is different from the standard free energy change for the hydrolysis of the beta phosphate group (the middle phosphate group)? (Note that our textbook shows the same standard free energy change for the hydrolysis of these two groups and that the textbook uses kcal/mol as the unit for free energy (some textbooks use kJ/mol)).
Please actually answer the question because when its been posted before noone actually answered they just gave information about ATP. Thanks!
Explanation / Answer
APT structure is that it possesses three phosphate groups and these are high energy bonds that releasing energy.The three phosphoryl groups are denoted basing on their proximity from the sugar i.e the ribose sugar.One that is close to the ribose sugar is designated as the alpha phosphate, next to it i.e the middle is denoted as the the beta phosphate, and the one that is far from the ribose sugar is denoted as the gamma phosphate.Since gamma phosphate is located far away from ribose than the beta phosphate,it has higher energy of hydrolysis than the beta phosphate and when the bond breaks, the products formed are ADP and iP that possess lower free energy than the reactants overall.
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