In vitro and in vivo production and purification of circular RNA aptamer

So Umekage*, Yo Kikuchi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)


RNA aptamers are potential candidates for RNA therapeutics. They must be clinically modified for medical applications because they are vulnerable to indigenous ribonucleases. Since circular RNA molecules without any chemical modification are much more stable than linear ones in a cell extract, we report the production of a circular form of streptavidin RNA aptamer both in vitro and in vivo. Circularization was accomplished by self-splicing permuted intron-exon sequences derived from T4 bacteriophage gene td. This sequence was producible in both Escherichia coli cells and in vitro. The circularized streptavidin RNA aptamer retained its binding of streptavidin and was stabile in HeLa cell extracts compared to the linear form of the streptavidin aptamer. The self-spliced circular RNA from the transcribed permuted intron-exon transcripts in E. coli cells was purified from a total RNA fraction using the solid-phase DNA probe method following anion exchange chromatography that excluded gel electrophoresis. This study provides an alternative method for designing and purifying useful RNA aptamers.

Original languageEnglish
Pages (from-to)265-272
Number of pages8
JournalJournal of Biotechnology
Issue number4
Publication statusPublished - 2009 Feb 23
Externally publishedYes


  • Circular RNA aptamer
  • In vivo expression
  • Self-splicing
  • Solid-phase DNA probe method

ASJC Scopus subject areas

  • Biotechnology
  • Applied Microbiology and Biotechnology


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