ArticleNucleic acids research2014
Interactions of the yeast mitochondrial RNA polymerase with the +1 and +2 promoter bases dictate transcription initiation efficiency.
Article in Nucleic acids research, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.
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Who cites it
8 citing papers in PubMed, 17 citations in OpenAlex.
- Mrx6 binds the Lon protease Pim1 N-terminal domain to confer selective substrate specificity and regulate mtDNA copy number.Nucleic acids research · 2026Article
- Mitochondrial Transcription of Entomopathogenic Fungi Reveals Evolutionary Aspects of Mitogenomes.Frontiers in microbiology · 2022Article
- Structure, mechanism, and regulation of mitochondrial DNA transcription initiation.The Journal of biological chemistry · 2020Review
- The dynamic landscape of transcription initiation in yeast mitochondria.Nature communications · 2020Article
- The C-terminal tail of the yeast mitochondrial transcription factor Mtf1 coordinates template strand alignment, DNA scrunching and timely transition into elongation.Nucleic acids research · 2020Article
- Article
- Plant organellar DNA primase-helicase synthesizes RNA primers for organellar DNA polymerases using a unique recognition sequence.Nucleic acids research · 2017Article
- Human mitochondrial transcription factors TFAM and TFB2M work synergistically in promoter melting during transcription initiation.Nucleic acids research · 2017Article
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Authors and funding
2 authors at 2 institutions in 1 country.
Funding
Abstract
Mitochondrial promoters of Saccharomyces cerevisiae share a conserved -8 to +1 sequence with +1+2 AA, AG or AT initiation sequence, which dictates the efficiency of transcription initiation by the mitochondrial RNA polymerase Rpo41 and its initiation factor Mtf1. We used 2-aminopurine fluorescence to monitor promoter melting and measured the kcat/Km of 2-mer synthesis to quantify initiation efficiency with systematic changes of the +1+2 base pairs to matched and mismatched pairs. We show that AA promoters are most efficient, followed by AG and then AT promoters, and the differences in their efficiencies stem specifically from differential melting of +1+2 region without affecting melting of the upstream -4 to -1 region. Inefficient +1+2 melting increases the initial NTPs Kms of the AG and AT promoters relative to AA or singly mispaired promoters. The 16-100-fold higher catalytic efficiency of AA initiation sequence relative to AG and AT, respectively, is partly due to Rpo41-Mtf1 interactions with the +1+2 non-template adenines that generate a stable pre-transcribing complex. We propose a model where the +2 base pair regulates the efficiency of initial transcription by controlling multiple steps including downstream promoter opening, +1+2 NTPs binding, and the rate of 2-mer synthesis.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.