Human mitochondrial transcription initiation complexes have similar topology on the light and heavy strand promoters

Yaroslav I. Morozov, Dmitry Temiakov

    Research output: Contribution to journalArticlepeer-review

    10 Scopus citations

    Abstract

    Transcription is a highly regulated process in all domains of life. In human mitochondria, transcription of the circular genome involves only two promoters, called light strand promoter (LSP) and heavy strand promoter (HSP), located in the opposite DNA strands. Initiation of transcription occurs upon sequential assembly of an initiation complex that includes mitochondrial RNA polymerase (mtRNAP) and the initiation factors mitochondrial transcription factor A (TFAM) and TFB2M. It has been recently suggested that the transcription initiation factor TFAM binds to HSP and LSP in opposite directions, implying that the mechanisms of transcription initiation are drastically dissimilar at these promoters. In contrast, we found that binding of TFAM to HSP and the subsequent recruitment of mtRNAP results in a pre-initiation complex that is remarkably similar in topology and properties to that formed at the LSP promoter. Our data suggest that assembly of the pre-initiation complexes on LSP and HSP brings these transcription units in close proximity, providing an opportunity for regulatory proteins to simultaneously control transcription initiation in both mtDNA strands.

    Original languageEnglish (US)
    Pages (from-to)13432-13435
    Number of pages4
    JournalJournal of Biological Chemistry
    Volume291
    Issue number26
    DOIs
    StatePublished - Jun 24 2016

    All Science Journal Classification (ASJC) codes

    • Biochemistry
    • Molecular Biology
    • Cell Biology

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