NCIt definition : A purine nucleotide triphosphate comprised of a guanine and a triphosphate moiety
bound to a ribose moiety at its 1' and 5' sites, respectively. Guanosine triphosphate
(GTP) can be utilized as a substrate for nucleic acid (DNA and RNA) synthesis, as
an energy source for protein synthesis and gluconeogenesis, and as a signaling molecule.;