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Nucleic Acids Research, 1990, Vol. 18, No. 22 6545-6551
© 1990

MOLECULAR BIOLOGY

Group II intron RNA-catalyzed recombination of RNA in vitro

M. Mörl and C. Schmelzer*

Institut für Genetik und Mikrobiologie der Universität München Maria-Ward-Straße 1a, D-8000 Munich 19, FRG

*To whom correspondence should be addressed

Received August 13, 1990. Revised September 7, 1990. Accepted September 7, 1990.

We report the first evidence for a novel reaction mediated by the self-splicing yeast mitochondrial group II intron bl1; the site-specific recombination of RNA molecules in vitro. Upon incubation of the intron lariat with two different RNAs, each harbouring a short sequence complementary to exon binding site 1 (EBS1) of the intron, novel recomblned RNAs are formed. As a result of this intrort-mediated shuffling of gene segments, the 5' part of RNA1 is ligated to the 3' part of RNA2 and, reciprocally, the 5' part of RNA2 to the 3' part of RNA1. Sequence analysis of the recombinant junction shows that the site of recombination is precisely located 3' to intron binding site 1 (IBS1). The hypothesized mechanism of recombination involves exchange of RNA 5' parts after the first step of a reverse splicing reaction. The possible role of this mechanism in vivo and during prebiotic evolution is discussed.


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