5'-GTP trisodium salt hydrate, an activator of the signal-transducing G proteins, serves as a precursor of mononucleotide units in the enzymatic biosynthesis of DNA and RNA.
2′-O-(2-Methoxyethyl)guanosine (2'-O-MOE-rG), a modified nucleoside, can be enzymatically converted from 2′-O-(2-methoxyethyl)-2,6-diaminopurine riboside by adenosine deaminase. However, this compound is not readily phosphorylated by cytosolic nucleoside kinases, and it cannot be incorporated into cellular DNA or RNA.