Selection of a ribozyme that functions as a superior template in a self-copying reaction

Rachel Green, Jack W. Szostak

Research output: Contribution to journalArticlepeer-review

101 Scopus citations


The sunY ribozyme is derived from a self-splicing RNA group I intron. This ribozyme was chosen as a starting point for the design of a self-replicating RNA because of its small size. As a means of facilitating the self-replication process, the size of this ribozyme was decreased by the deletion of nonconserved structural domains; however, when such deletions were made, there were severe losses of enzymatic activity. In vitro genetic selection was used to identify mutations that reactivate a virtually inactive sunY deletion mutant. A selected mutant with five substitution mutations scattered throughout the primary sequence showed greater catalytic activity than the original ribozyme under the selection conditions. The sunY ribozyme and its small selected variant can both catalyze template-directed oligonucleotide assembly. The small size and reduced secondary structure of the selected variant results in an enhancement, relative to that of the original ribozyme, of its rate of self-copying. This engineered ribozyme is able to function effectively both as a catalyst and as a template in self-copying reactions.

Original languageEnglish (US)
Pages (from-to)1910-1915
Number of pages6
Issue number5090
StatePublished - Jan 1 1992
Externally publishedYes

ASJC Scopus subject areas

  • General


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