Adenosine is a nucleoside in which the base adenine is covalently linked to the 1′-carbon of the sugar ribose. In the adenosine phosphates, there are one, two, or three phosphate groups also bonded to the ribose, typically linked in series to the 5′-carbon of the sugar. The bond connecting the first phosphate group to the carbon is a phosphoester bond, and the bonds between the phosphate groups are phosphodiester bonds. The adenosine phosphates include adenosine
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5′-triphosphate (ATP), adenosine 5′-diphosphate (ADP), and adenosine 5′-monophosphate (AMP). Nucleosides to which phosphates are attached are also referred to as nucleotides.
See also: Adenine; ATP (Adenosine Triphosphate); Campbell Model; Nucleoside; Nucleotide.
Brenner’s Encyclopedia of Genetics, 2nd edition, Volume 1