Proteomics

Dataset Information

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TEFM regulates both transcription elongation and RNA processing in mitochondria


ABSTRACT: Regulation of replication and expression of mitochondrial DNA (mtDNA) is essential for cellular energy conversion via oxidative phosphorylation. The mitochondrial transcription elongation factor (TEFM) has been proposed to regulate the switch between transcription termination for replication primer formation and processive, near-genome length transcription for mtDNA gene expression. Here, we report that Tefm is essential for mouse embryogenesis and that levels of promoter-distal mitochondrial transcripts are drastically reduced in conditional Tefm-knockout hearts. In contrast, the promoter-proximal transcripts are much increased in Tefm knockouts, but they mostly terminate before the region where the switch from transcription to replication occurs, and consequently de novo mtDNA replication is profoundly reduced. Unexpectedly, deep sequencing of RNA from Tefm knockouts revealed accumulation of unprocessed transcripts in addition to defective transcription elongation. Furthermore, a proximity labelling (BioID) assay showed that TEFM interacts with multiple RNA processing factors. Our data demonstrate that TEFM acts as a general transcription elongation factor, necessary for both gene transcription and replication primer formation, and loss of TEFM affects RNA processing in mammalian mitochondria.

INSTRUMENT(S): Orbitrap Fusion, Q Exactive

ORGANISM(S): Homo Sapiens (human) Mus Musculus (mouse)

TISSUE(S): Heart, Cell Culture

SUBMITTER: Ilian Atanassov  

LAB HEAD: Nils-Göran Larsson

PROVIDER: PXD013398 | Pride | 2019-04-25

REPOSITORIES: Pride

Dataset's files

Source:
Action DRS
161012_QE_IA_IK_MM_01.raw Raw
161012_QE_IA_IK_MM_02.raw Raw
161012_QE_IA_IK_MM_03.raw Raw
161012_QE_IA_IK_MM_04.raw Raw
161012_QE_IA_IK_MM_05.raw Raw
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Publications


Regulation of replication and expression of mitochondrial DNA (mtDNA) is essential for cellular energy conversion via oxidative phosphorylation. The mitochondrial transcription elongation factor (TEFM) has been proposed to regulate the switch between transcription termination for replication primer formation and processive, near genome-length transcription for mtDNA gene expression. Here, we report that <i>Tefm</i> is essential for mouse embryogenesis and that levels of promoter-distal mitochond  ...[more]

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