Abstract
Gaps in the central strand of oligonucleotide triplexes bind nucleoside phosphates tightly. Watson-Crick and Hoogsteen base pairing as design principle yield motifs with high affinity for nucleoside phosphates with A or G as nucleobase, including ATP. The second messenger 3',5'-cAMP is bound with nanomolar affinity. A designed DNA motif accommodates seven nucleotides at a time. The design was implemented for both DNA and RNA.
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