A version of this molecule with four attached phosphate groups is an alarmone that regulates the stringent response in E. Coli.  
A 2000 study discussed the possibility of an exchange factor involving the plasma membrane and this molecule in chromaffin cells. A version of this molecule with four attached phosphate groups is an alarmone that regulates the stringent response in E. Coli.  Hoogsteen bonding stabilizes the square arrangement of these molecules in a namesake quadruplex than can be found in vitro in telomeres, and its deamination results in the production of ? xanthine. Attached to a ribose, its phosphorylation results in a molecule that acts as a substrate for synthesizing RNA, and proteins involving them act as regulators involved in second messenger cascade reactions; an example of the latter is stimulating the use of ATP in producing cyclic AMP. First extracted from sea bird excretions, this is, FTP, which purine, one of the five nucleotide bases which base pairs with cytosine?
A 2000 study discussed the possibility of an exchange factor involving the plasma membrane and this molecule in chromaffin cells.
{guanine} [or {guanosine} or {G}]