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A Quencher-Free Linear Probe from Serinol Nucleic Acid with a Fluorescent Uracil Analogue.

Keiji MurayamaHiroyuki Asanuma
Published in: Chembiochem : a European journal of chemical biology (2019)
With the goal of developing a quencher-free probe composed of an artificial nucleic acid, the fluorescent nucleobase analogue 5-(perylenylethynyl)uracil (Pe U), which was incorporated into totally artificial serinol nucleic acid (SNA) as a substitute for thymine, has been synthesized. In the context of a 12-mer duplex with RNA, these fluorophores reduce duplex stability slightly compared with that of an SNA without Pe U modification; thus suggesting that structural distortion is not induced by the modification. If two Pe Us were incorporated at separate positions in an SNA, the fluorescent emission at λ≈490 nm was clearly enhanced upon hybridization with complementary RNA. A quencher-free SNA linear probe containing three Pe Us, each separated by six nucleobases, has been designed. Detection of target RNA with high sensitivity and discrimination of a single-base mismatch has also been demonstrated.
Keyphrases
  • nucleic acid
  • living cells
  • quantum dots
  • fluorescent probe
  • label free
  • single molecule
  • sensitive detection
  • photodynamic therapy
  • loop mediated isothermal amplification
  • oxide nanoparticles