A ribozyme that lacks cytidine

Jeff Rogers and Gerald F. Joyce ()
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Jeff Rogers: The Scripps Research Institute
Gerald F. Joyce: The Scripps Research Institute

Nature, 1999, vol. 402, issue 6759, 323-325

Abstract: Abstract The RNA-world hypothesis proposes that, before the advent of DNA and protein, life was based on RNA, with RNA serving as both the repository of genetic information and the chief agent of catalytic function1. An argument against an RNA world is that the components of RNA lack the chemical diversity necessary to sustain life. Unlike proteins, which contain 20 different amino-acid subunits, nucleic acids are composed of only four subunits which have very similar chemical properties. Yet RNA is capable of a broad range of catalytic functions2,3,4,5,6,7. Here we show that even three nucleic-acid subunits are sufficient to provide a substantial increase in the catalytic rate. Starting from a molecule that contained roughly equal proportions of all four nucleosides, we used in vitro evolution to obtain an RNA ligase ribozyme that lacks cytidine. This ribozyme folds into a defined structure and has a catalytic rate that is about 105-fold faster than the uncatalysed rate of template-directed RNA ligation.

Date: 1999
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DOI: 10.1038/46335

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