TEFM (c17orf42) is necessary for transcription of human mtDNA

Michal Minczuk*, Jiuya He, Anna M. Duch, Thijs J. Ettema, Aleksander Chlebowski, Karol Dzionek, Leo G.J. Nijtmans, Martijn A. Huynen, Ian J. Holt

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

129 Citations (Scopus)


Here we show that c17orf42, hereafter TEFM (transcription elongation factor of mitochondria), makes a critical contribution to mitochondrial transcription. Inactivation of TEFM in cells by RNA interference results in respiratory incompetence owing to decreased levels of H-and L-strand promoter-distal mitochondrial transcripts. Affinity purification of TEFM from human mitochondria yielded a complex comprising mitochondrial transcripts, mitochondrial RNA polymerase (POLRMT), pentatricopeptide repeat domain 3 protein (PTCD3), and a putative DEAD-box RNA helicase, DHX30. After RNase treatment only POLRMT remained associated with TEFM, and in human cultured cells TEFM formed foci coincident with newly synthesized mitochondrial RNA. Based on deletion mutants, TEFM interacts with the catalytic region of POLRMT, and in vitro TEFM enhanced POLRMT processivity on ss-and dsDNA templates. TEFM contains two HhH motifs and a Ribonuclease H fold, similar to the nuclear transcription elongation regulator Spt6. These findings lead us to propose that TEFM is a mitochondrial transcription elongation factor.

Original languageEnglish
Pages (from-to)4284-4299
Number of pages16
JournalNucleic acids research
Issue number10
Publication statusPublished - 1 May 2011
Externally publishedYes


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