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ATPases and GTPases hydrolyse their NTP substrates to NDP and inorganic phosphate; both hydrolysis reactions liberate 53 kJ/mol Gibbs free energy. ATP, adenosine 5’-triphosphate; GTP, guanosine 5’-triphosphate; NTP, nucleoside triphosphate; NDP, nucleoside diphosphate; P i, inorganic phosphate.
