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Site-Specific Incorporation of Extra Components into RNA by Transcription Using Unnatural Base Pair Systems
The expansion of the genetic alphabet, by an unnatural base pair system, provides a powerful tool for the site-specific incorporation of extra, functional components into nucleic acids by replication and transcription. We developed several unnatural base pairs that function in PCR and in vitro transcription. Among them, a hydrophobic, unnatural base pair between 7-(2-thienyl)-imidazo[4,5-b]pyridine (denoted by Ds ) and pyrrole-2-carbaldehyde (denoted by Pa ) exhibits high fidelity in PCR and T7 transcription. Modified Pa bases linked with functional groups of interest can also be site-specifically incorporated into RNA opposite Ds in DNA templates, by T7 RNA polymerase. Here, we describe the methods for the site-specific biotinylation of RNA molecules by transcription using the Ds –Pa pair with biotinylated Pa TP (Biotin-Pa TP).
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