Hydrolysis of ATP to ADP + Pi

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Hydrolysis of ATP to ADP + Pi

Hydrolysis of ATP to ADP + Pi

(See attached file for full problem description)

For problems 6-8, assume standard conditions of pH 7 and 25C, unless otherwise stated, and assume equilibrium constants in which any [H+] and [H2O] terms have been incorporated into the constant, i.e., you don’t have to use [H+] in any of the calculations.

6. The equilibrium constant for the reaction of ADPS and 1,3-diphosphoglycerate to give ATPS and 3-phosphoglycerate is 400. What is the G´ for this reaction?

7. Muscles are powered by the hydrolysis of ATP to ADP + Pi. The G´ for hydrolysis of ATP is -8500 cal mol-1. At the beginning of exercise the G for the reaction is -13,200 cal mol-1, and the ATP concentration is 10 times that of ADP. How much will this differ from the G for the reaction when exercise has reduced the ATP to 10-4 M and ADP is10-3 M with Pi at 0.04 M?

8. An amino acid binding protein involved in transport of the amino acid across membranes was isolated from E. coli. Equilibrium dialysis measurements at 25 and 37C yielded dissociation constant (Ks) values of 8.8 x 10-6 M and 3.0 x 10-5 M, respectively, for the protein-ligand complex. Calculate
(a) G´ values for the binding reaction at 25C and 37C,
(b) H´ and S´ for the binding reaction assuming they are constant over this temperature range, and
(c) expected Ks at 30C.

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