Abstract
In the RNA world, enrichment of self-replicating RNAs would have been beneficial to their survival, amplification, and evolution. Self-assembly of RNAs may be a strategy by which they enrich themselves. We examined the effects of molecular crowding on the activity of a bimolecular group I ribozyme and its derivative that self-assembles to form ribozyme oligomers. In a comparative activity assay using PEG as a molecular crowder, PEG rescued mutations in the parent bimolecular ribozyme more effectively than those in the oligomeric form.
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