Cyclic nucleotide 158542 219327064 2008-06-14T18:18:48Z Arcadian 104523 nav [[Image:Cyclic-adenosine-monophosphate-2D-skeletal.png|thumb|[[Cyclic adenosine monophosphate]]]] [[Image:CGMP.png|thumb|[[Cyclic guanosine monophosphate]]]] A '''cyclic nucleotide''' is any [[nucleotide]] in which the [[phosphate]] group is bonded to two of the [[sugar]]'s hydroxyl groups, forming a cyclical or ring structure. These include: * [[cyclic AMP]] * [[cyclic GMP]] * [[cyclic ADP-ribose]] These function as [[second messenger]]s associated with [[G protein]]s and [[Calcium signaling]]. ==External links== * {{MeshName|Nucleotides,+Cyclic}} {{biochem-stub}} {{Nucleobases, nucleosides, and nucleotides}} [[Category:Nucleotides]]