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Uridylyl-(3′→5′)-adenosine (UpA) is a dinucleotide, which is composed of a unrail base and an adenosine suger molecule through a 3'-5' phosphodiester bond. Uridylyl-(3′→5′)-adenosine participates in the biological processes, such as gene expression regulation, signal transduction, and protein synthesis[1].

[1] Griffin BE, et al., The methylation of adenylyl-(3'-5')-uridine and uridylyl-(3'-5')-adenosine with diazomethane. Biochim Biophys Acta. 1967 Jul 18;142(2):536-8. DOI:10.1016/0005-2787(67)90634-x