CLPP coordinates mitoribosomal assembly through the regulation of ERAL1 levels

EMBO J. 2016 Dec 1;35(23):2566-2583. doi: 10.15252/embj.201694253. Epub 2016 Oct 20.

Abstract

Despite being one of the most studied proteases in bacteria, very little is known about the role of ClpXP in mitochondria. We now present evidence that mammalian CLPP has an essential role in determining the rate of mitochondrial protein synthesis by regulating the level of mitoribosome assembly. Through a proteomic approach and the use of a catalytically inactive CLPP, we produced the first comprehensive list of possible mammalian ClpXP substrates involved in the regulation of mitochondrial translation, oxidative phosphorylation, and a number of metabolic pathways. We further show that the defect in mitoribosomal assembly is a consequence of the accumulation of ERAL1, a putative 12S rRNA chaperone, and novel ClpXP substrate. The presented data suggest that the timely removal of ERAL1 from the small ribosomal subunit is essential for the efficient maturation of the mitoribosome and a normal rate of mitochondrial translation.

Keywords: CLPP; ERAL1; OXPHOS deficiency; mitochondrial ribosome assembly.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Cells, Cultured
  • Endopeptidase Clp / metabolism*
  • Fibroblasts / physiology
  • GTP-Binding Proteins / metabolism*
  • Mice
  • Mice, Knockout
  • Mitochondria / metabolism*
  • Protein Biosynthesis
  • RNA-Binding Proteins / metabolism*
  • Ribosomes / metabolism*

Substances

  • Era protein, mouse
  • RNA-Binding Proteins
  • CLPP protein, mouse
  • Endopeptidase Clp
  • GTP-Binding Proteins