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LRPPRC is necessary for polyadenylation and coordination of translation of mitochondrial mRNAs

Authors
Ruzzenente, B; Metodiev, MD; Wredenberg, A; Bratic, A; Park, CB; Cámara, Y; Milenkovic, D; Zickermann, V; Wibom, R; Hultenby, K; Erdjument-Bromage, H; Tempst, P; Brandt, U; Stewart, JB; Gustafsson, CM; Larsson, NG
Citation
The EMBO journal, 31(2):443-456, 2012
Journal Title
The EMBO journal
ISSN
0261-41891460-2075
Abstract
Regulation of mtDNA expression is critical for maintaining cellular energy homeostasis and may, in principle, occur at many different levels. The leucine-rich pentatricopeptide repeat containing (LRPPRC) protein regulates mitochondrial mRNA stability and an amino-acid substitution of this protein causes the French-Canadian type of Leigh syndrome (LSFC), a neurodegenerative disorder characterized by complex IV deficiency. We have generated conditional Lrpprc knockout mice and show here that the gene is essential for embryonic development. Tissue-specific disruption of Lrpprc in heart causes mitochondrial cardiomyopathy with drastic reduction in steady-state levels of most mitochondrial mRNAs. LRPPRC forms an RNA-dependent protein complex that is necessary for maintaining a pool of non-translated mRNAs in mammalian mitochondria. Loss of LRPPRC does not only decrease mRNA stability, but also leads to loss of mRNA polyadenylation and the appearance of aberrant mitochondrial translation. The translation pattern without the presence of LRPPRC is misregulated with excessive translation of some transcripts and no translation of others. Our findings point to the existence of an elaborate machinery that regulates mammalian mtDNA expression at the post-transcriptional level.
MeSH terms
AnimalsCytochrome-c Oxidase Deficiency/*geneticsDNA, Mitochondrial/geneticsElectron Transport Complex IV/analysisHeLa CellsHumansLeigh Disease/*geneticsMacromolecular SubstancesMiceMice, KnockoutMitochondria, Heart/*physiologyNeoplasm Proteins/deficiency/genetics/*physiologyOrgan SpecificityPolyadenylation/*physiologyPolynucleotide AdenylyltransferaseProtein Biosynthesis/*physiologyRNA StabilityRNA, MessengerRNA-Binding Proteins/metabolism
DOI
10.1038/emboj.2011.392
PMID
22045337
Appears in Collections:
Journal Papers > School of Medicine / Graduate School of Medicine > Physiology
AJOU Authors
박, 찬배
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