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Non-hydrogen-bonded base pairs for specific transcription.

Authors
  • Hirao, Ichiro
  • Mitsui, Tsuneo
  • Kimoto, Michiko
  • Kawai, Rie
  • Sato, Akira
  • Yokoyama, Shigeyuki
Type
Published Article
Journal
Nucleic acids symposium series (2004)
Publication Date
Jan 01, 2005
Issue
49
Pages
33–34
Identifiers
PMID: 17150619
Source
Medline
License
Unknown

Abstract

Specific transcription mediated by unnatural base pairs could create novel RNA molecules with increased functionality and expand the genetic code. Here, we report an unnatural base pair between pyrrole-2-carbaldehyde (Pa) and 2-amino-6-(2-thienyl)purine (s) or 6-(2-thienyl)purine (s') for the site-specific incorporation of s or s' into RNA by T7 RNA polymerase, using DNA templates containing Pa. Despite the absence of significant hydrogen bonding interactions between the unnatural bases, the efficiency and fidelity of the s-Pa pairing in transcription were as high as those of the natural base pairings. As shown in replication, this indicates the importance of shape complementarity between pairing bases in transcription. Since the s base is fluorescent, this transcription mediated by the s-Pa pair provides a useful tool for site-specific fluorescence probing of RNA molecules.

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