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Characterization of transcription initiation sites on the soybean mitochondrial genome allows identification of a transcription-associated sequence motif

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Summary

Transcription initiation sites on the soybean mitochondrial genome have been characterized by sequence analysis of in vitro-capped soybean mtRNAs and corresponding mtDNA regions. The most abundant, discrete soybean mtRNA species labeled by guanylyltransferase and [α-32P]GTP are shown to correspond to the major transcript of the atp9 gene and to a group of small RNAs consisting of a discrete 80 nucleotide (nt) species plus heterogeneous species ranging in size from 133 to 148 nt. The 133-148 nt RNAs represent a set of transcripts with a common 5′ terminus and ragged 3′ ends, while the 80 nt RNA corresponds to positions 53–133 of the 133 nt species. The major, discrete in vitro-capped RNA species thus correspond to primary transcripts originating at three sites located in two regions of the soybean mitochondrial genome. The sequences extending from 13 nucleotides upstream to 8 nucleotides downstream of the initiation sites for the atp9 and 133–148 nt transcripts are identical at 18 of 21 positions. Sequences closely resembling this motif are located at some other 5′ transcript termini of dicot plant mitochondria. Less closely related sequences are found at transcription initiation sites of wheat and maize mitochondria.

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Communicated by D.Y. Thomas

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Brown, G.G., Auchincloss, A.H., Covello, P.S. et al. Characterization of transcription initiation sites on the soybean mitochondrial genome allows identification of a transcription-associated sequence motif. Molec. Gen. Genet. 228, 345–355 (1991). https://doi.org/10.1007/BF00260626

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  • DOI: https://doi.org/10.1007/BF00260626

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