5'-Guanylic acid disodium salt (5'-GMP disodium salt) is composed of guanine, ribose, and phosphate moieties and it is a nucleotide monomer in messenger RNA. Guanosine derivatives are involved in intracellular signal transduction and have been identified in repetitive genomic sequences in telomeres, in ribosomal DNA, immunoglobulin heavy‐chain switch regions, and in the control regions of proto-oncogenes[1].
[1]. Lan T, et al. Type II cGMP-dependent protein kinase phosphorylates EGFR at threonine 669 and thereby inhibits its activation. Biochem Biophys Res Commun. 2019 Aug 6.