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Nucleic Acids Research, 1990, Vol. 18, No. 9 2691-2697
© 1990

Molecular Biology

A self-splicing group II intron in the mitochondrial large subunit rRNA (LSUrRNA) gene of the eukaryotic alga Scenedesmus obliquus

Ulrich Kück*, Ingeborg Godehardt and Udo Schmidt1

Lehrstuhl fur Allgenmeine Botanik, Ruhr Universitaät Bochum Postfach 102148, D-4630 Bochum 1 1Technische Universitaat Berlin, FB 13, FG Mikrobiologie and Genetick, Gustav-Meyer-Alle 25 D-1000 Berlin 65, FRG

*To whom correspondence should be addressed

Received January 9, 1990. Accepted March 28, 1990.

The DNA sequence has been determined of the 3'terminus from the mitochondrial large subunit ribosomal RNA (LSUrRNA) gene of the eukaryotic green alga Scenedesmus obliquus (strain KS3/2). The gene contains two intervening sequences with characteristic sequence motifs of group II and group I introns respectively. The exon/lntron boundaries of the introns have been revealed by sequence determination of the mature rRNA. During RNA processing of the precursor RNA, several abundant RNA molecules are stably maintained in addition to the mature rRNA in vivo. In vitro transcripts of the LSUrRNA gene containing the group II intron (608 bp) display a strong ‘self-splicing’ activity under high salt conditions. The 608 bp intron is the first group II intron reported to be integrated into a LSUrRNA gene and represents the smallest selfsplicing group II intron from eukaryotic organelles so far described.


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