Cyclic nucleotide
158542
219327064
2008-06-14T18:18:48Z
Arcadian
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[[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]]