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. 1986 Sep;6(9):3253–3261. doi: 10.1128/mcb.6.9.3253

Precise assignment of the light-strand promoter of mouse mitochondrial DNA: a functional promoter consists of multiple upstream domains.

D D Chang, D A Clayton
PMCID: PMC367063  PMID: 3023972

Abstract

Using deletion mutagenesis we localized the promoter for the light strand of mouse mitochondrial DNA to a 97-base-pair region, from -88 to +9 nucleotides of the transcriptional initiation site. Within this region the light-strand promoter could be dissected into at least three different functional domains. The specificity region, a maximum of 19 base pairs between -10 and +9 of the transcriptional initiation site, was essential and sufficient for accurate transcriptional initiation. A second region, extending to -29 nucleotides from the initiation site, facilitated the formation of a preinitiation complex between the template DNA and factor(s) present in the mitochondrial RNA polymerase fraction and was required for efficient transcription. A third, ill-defined upstream region, which extended up to -88 nucleotides from the initiation site, appeared to influence template transcriptional efficiencies in competition assays. Without the specificity domain, the upstream regions were incapable of supporting any transcription. The presence of multiple upstream domains was confirmed by disrupting nucleotide sequences in the upstream region by using linker insertion and linker replacement techniques.

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