GTP
GTP: translation
(= guanosine 5\'-triphosphate)
Like ATP a source of phosphorylating potential, but is separately synthesized and takes part in a limited, distinct set of energy-requiring processes. Synthesis is by a substrate-linked phosphorylation involving succinyl coenzyme A, part of the tricarboxylic acid cycle. GTP is required in protein synthesis, the assembly of microtubules, and for the activation of regulatory G-proteins GTP-binding proteins.