Figure 1.

Overview of the number and abundance of mitochondrial proteins across functional categories. (A) Pie chart showing of functional categories of the confirmed set of 726 mitochondrial proteins (see Table S1B,C in Supplementary Material). A comparison with the more complete yeast mitochondrial proteome shows that similar proportion of proteins involving energy metabolism as well as proteins with unknown functions has been found (Schmidt et al., 2010). In addition, more proteins are involved in mitochondrial genome maintenance (white) in plants (∼20%) than in yeast (∼12%), due to the presence of numerous plant-specific pentatricopeptide repeat (PPR) proteins and a larger genome size. (B) Distribution of the abundance of proteins that can be identified by gel-free MS (Taylor et al., 2011) across seven functional categories.