An in vitro-selected RNA receptor for the GAAC loop: Modular receptor for non-GNRA-type tetraloop

Junya Ishikawa, Hiroyuki Furuta, Yoshiya Ikawa

Research output: Contribution to journalArticle

7 Citations (Scopus)


Although artificial RNA motifs that can functionally replace the GNRA/receptor interaction, a class of RNA-RNA interacting motifs, were isolated from RNA libraries and used to generate designer RNA structures, receptors for non-GNRA tetraloops have not been found in nature or selected from RNA libraries. In this study, we report successful isolation of a receptor motif interacting with GAAC, a non-GNRA tetraloop, from randomized sequences embedded in a catalytic RNA. Biochemical characterization of the GAAC/receptor interacting motif within three structural contexts showed its binding affinity, selectivity and structural autonomy. The motif has binding affinity comparable with that of a GNRA/receptor, selectivity orthogonal to GNRA/receptors and structural autonomy even in a large RNA context. These features would be advantageous for usage of the motif as a building block for designer RNAs. The isolated motif can also be used as a query sequence to search for unidentified naturally occurring GANC receptor motifs.

Original languageEnglish
Pages (from-to)3748-3759
Number of pages12
JournalNucleic acids research
Issue number6
Publication statusPublished - Apr 1 2013


All Science Journal Classification (ASJC) codes

  • Genetics

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