MeSH definition : Guanosine 5'-diphosphate 2'(3')-diphosphate. A guanine nucleotide containing four
phosphate groups. Two phosphate groups are esterified to the sugar moiety in the 5'
position and the other two in the 2' or 3' position. This nucleotide serves as a messenger
to turn off the synthesis of ribosomal RNA when amino acids are not available for
protein synthesis. Synonym: magic spot I.;
Guanosine 5'-diphosphate 2'(3')-diphosphate. A guanine nucleotide containing four
phosphate groups. Two phosphate groups are esterified to the sugar moiety in the 5'
position and the other two in the 2' or 3' position. This nucleotide serves as a messenger
to turn off the synthesis of ribosomal RNA when amino acids are not available for
protein synthesis. Synonym: magic spot I.