The enzyme-catalyzed formation of fatty acyl-carnitine from fatty acyl-CoA (Fig. P25.36)

Chapter 25, Problem 25.36

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The enzyme-catalyzed formation of fatty acyl-carnitine from fatty acyl-CoA (Fig. P25.36) is an early step in the metabolism of fatty acids. The DG for the hydrolysis of an acyl-CoA is 231.4 kJ mol1 (7.5 kcal mol1 ), and the DG for the hydrolysis of an acyl-carnitine is 17.4 kJ mol1 (4.2 kcal mol1 ). (a) Calculate the DG for the reaction shown in Fig. P25.36. (b) Calculate the equilibrium constant (at pH 5 7) for this reaction at 37 C (310 K). (c) Give a structural reason that the reaction is so favorable.

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