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The mat-r open reading frame is transcribed from a non-canonical promoter and contains an internal promoter to co-transcribe exonsnad1e and nad5III in wheat mitochondria

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Abstract

The expression of the mat-r locus (mat-r-nad1e-nad5III) was studied in wheat mitochondria. Transcription initiation sites were mapped by S1 protection, primer extension and capping experiments. Two different transcription initiation sites were found. One, non-canonical promoter of low expression level generates a transcript containing the complete mat-r open reading frame (orf), suggesting that this form is the maturase-reverse transcriptase mRNA. A second transcription initiation site, found within the coding region of the mat-r orf, directs the transcription of an abundant co-transcript containing the carboxy-terminal region of the mat-r orf, exon e of the nad1 gene, exon III of the nad5 gene and their respective trans-introns. The co-transcript promoter carries the consensus motif of plant mitochondrial promoters. Analysis of transcript sequences reveals the presence of editing sites in analogous positions in both nad1e and nad5III trans-introns, suggesting that RNA editing is necessary for the trans-splicing process.

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  1. Laboratoire de Réplication et Expression des Gènes Eucaryotes et Rétroviraux, EP-630, Centre National de la Recherche Scientifique and Université Victor Segalen-Bordeaux II. 1, rue Camille Saint-Saëns, 33077, Bordeaux Cedex, France

    Jean-Claude Farré & Alejandro Araya

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  1. Jean-Claude Farré
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  2. Alejandro Araya
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Farré, JC., Araya, A. The mat-r open reading frame is transcribed from a non-canonical promoter and contains an internal promoter to co-transcribe exonsnad1e and nad5III in wheat mitochondria. Plant Mol Biol 40, 959–967 (1999). https://doi.org/10.1023/A:1006296422485

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