Which enzyme is involved in accelerating the conversion of GTP to ATP?

The enzyme that accelerates the conversion of GTP to ATP is nucleoside diphosphokinase. This enzyme functions by catalyzing the transfer of a phosphate group from one nucleotide diphosphate to another, which allows for the interconversion of nucleotide triphosphates, such as GTP and ATP, in a process called nucleoside diphosphate (NDP) kinase activity. It plays a critical role in maintaining the balance of nucleoside triphosphates within the cell, enabling the rapid regeneration of ATP when GTP is available in excess.

NMP kinase, adenylate kinase, and ATP synthase play different roles in nucleotide metabolism or ATP production but are not primarily involved in the direct conversion of GTP to ATP. NMP kinase is involved in phosphorylating nucleoside monophosphates to diphosphates, while adenylate kinase catalyzes the interconversion between ADP and ATP. ATP synthase, on the other hand, is responsible for synthesizing ATP from ADP and inorganic phosphate (Pi) during oxidative phosphorylation or photosynthesis but does not directly facilitate the conversion of GTP to ATP.