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Cold Spring Harb Perspect Biol. 2011 Aug 1;3(8):a003616. doi: 10.1101/cshperspect.a003616.

Group II introns: mobile ribozymes that invade DNA.

Author information

1
Institute for Cellular and Molecular Biology, Department of Chemistry and Biochemistry, University of Texas at Austin, Austin, Texas 78712, USA. lambowitz@mail.utexas.edu

Abstract

Group II introns are mobile ribozymes that self-splice from precursor RNAs to yield excised intron lariat RNAs, which then invade new genomic DNA sites by reverse splicing. The introns encode a reverse transcriptase that stabilizes the catalytically active RNA structure for forward and reverse splicing, and afterwards converts the integrated intron RNA back into DNA. The characteristics of group II introns suggest that they or their close relatives were evolutionary ancestors of spliceosomal introns, the spliceosome, and retrotransposons in eukaryotes. Further, their ribozyme-based DNA integration mechanism enabled the development of group II introns into gene targeting vectors ("targetrons"), which have the unique feature of readily programmable DNA target specificity.

PMID:
20463000
PMCID:
PMC3140690
DOI:
10.1101/cshperspect.a003616
[Indexed for MEDLINE]
Free PMC Article

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