Dual-targeted proteins tend to be more evolutionarily conserved

Irit Kisslov, Adi Naamati, Nitzan Shakarchy, Ophry Pines*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

In eukaryotic cells, identical proteins can be located in more than a single subcellular compartment, a phenomenon termed dual targeting. We hypothesized that dual-targeted proteins should be more evolutionary conserved than exclusive mitochondrial proteins, due to separate selective pressures administered by the different compartments to maintain the functions associated with the protein sequences. We employed codon usage bias, propensity for gene loss, phylogenetic relationships, conservation analysis at the DNA level, and gene expression, to test our hypothesis. Our findings indicate that, indeed, dual-targeted proteins are significantly more conserved than their exclusively targeted counterparts. We then used this trait of gene conservation, together with previously identified traits of dual-targeted proteins (such as protein net charge and mitochondrial targeting sequence strength) to 1) create, for the first time (due to addition of conservation parameters), a tool for the prediction of dual-targeted mitochondrial proteins based on protein and mRNA sequences, and 2) show that molecular mechanisms involving one versus two translation products are not correlated with specific dual-targeting parameters. Finally, we discuss what evolutionary pressure maintains protein dual targeting in eukaryotes and deduce, as we initially hypothesized, that it is the discrete functions of these proteins in the different subcellular compartments, regardless of their dual-targeting mechanism.

Original languageAmerican English
Pages (from-to)2770-2779
Number of pages10
JournalMolecular Biology and Evolution
Volume31
Issue number10
DOIs
StatePublished - 1 Oct 2014

Bibliographical note

Publisher Copyright:
© 2014 The Author 2014.

Keywords

  • dual targeting
  • mitochondrial import
  • protein conservation

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