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Previous work from our laboratory has shown that transcription of Xenopus laevis mitochondrial DNA initiates both in vivo and in vitro from bidirectional promoters located between the gene for tRNA(Phe) and the 5' termini of displacement loop DNA strands. A consensus sequence matching the octanucleotide ACGTTATA surrounds each transcription start site. In the present study, we used in vitro mutagenesis to define sequences required for specific transcription in vitro. First, cloned mitochondrial DNA templates generated by deletion mutagenesis were transcribed in vitro to define the limits of functional promoters. The bidirectional promoter located approximately 33 nucleotides upstream from the gene for tRNA(Phe), termed promoter 1, was studied in greatest detail. The results confirmed the hypothesis that the consensus octanucleotide sequence surrounding each start site is an essential promoter element. A duplex 18-base-pair oligonucleotide encoding the symmetrical promoter 1 region was synthesized and cloned in a plasmid vector. This synthetic oligonucleotide was sufficient to support bidirectional transcription. Point mutations within this oligonucleotide were used to identify critical residues within the consensus sequence.
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