Organization and Regulation of Mitochondrial Protein Synthesis

Annu Rev Biochem. 2016 Jun 2;85:77-101. doi: 10.1146/annurev-biochem-060815-014334. Epub 2016 Jan 18.

Abstract

Mitochondria are essential organelles of endosymbiotic origin that are responsible for oxidative phosphorylation within eukaryotic cells. Independent evolution between species has generated mitochondrial genomes that are extremely diverse, with the composition of the vestigial genome determining their translational requirements. Typically, translation within mitochondria is restricted to a few key subunits of the oxidative phosphorylation complexes that are synthesized by dedicated ribosomes (mitoribosomes). The dramatically rearranged mitochondrial genomes, the limited set of transcripts, and the need for the synthesized proteins to coassemble with nuclear-encoded subunits have had substantial consequences for the translation machinery. Recent high-resolution cryo-electron microscopy has revealed the effect of coevolution on the mitoribosome with the mitochondrial genome. In this review, we place the new structural information in the context of the molecular mechanisms of mitochondrial translation and focus on the novel ways protein synthesis is organized and regulated in mitochondria.

Keywords: biogenesis; evolution; mitochondria; mitoribosome; translation.

Publication types

  • Review

MeSH terms

  • Animals
  • Biological Evolution
  • DNA, Mitochondrial / genetics*
  • DNA, Mitochondrial / metabolism
  • Gene Expression Regulation
  • Genome, Mitochondrial*
  • Humans
  • Mitochondria / genetics*
  • Mitochondria / metabolism
  • Mitochondrial Membranes / metabolism
  • Mitochondrial Proteins / genetics*
  • Mitochondrial Proteins / metabolism
  • Mitochondrial Ribosomes / chemistry
  • Mitochondrial Ribosomes / metabolism
  • Models, Molecular
  • Organelle Biogenesis
  • Oxidative Phosphorylation
  • Protein Biosynthesis*
  • Signal Transduction

Substances

  • DNA, Mitochondrial
  • Mitochondrial Proteins