Abstract
SummaryThe social ameba Dictyostelium discoideum has emerged as a powerful model to study mitochondrial genetics and bioenergetics. However, a comprehensive inventory of mitochondrial proteins that is critical to understanding mitochondrial processes has yet to be curated. Here, we utilized high-throughput multiplexed protein quantitation and homology analyses to generate a high-confidence mitochondrial protein compendium consisting of 936 proteins. Our proteomic approach, which utilizes mass spectrometry in combination with mathematical modeling, was validated through mitochondrial targeting sequence prediction and live-cell imaging. Our final compendium consists of 936 proteins. Nearly, a third of D. discoideum mitochondrial proteins do not have homologs in humans, budding yeasts, or an ancestral alphaproteobacteria. Additionally, we leverage our compendium to highlight the complexity of metabolic reprogramming during starvation-induced development. Our compendium lays a foundation to investigate mitochondrial processes that are unique in ameba and to understand the functions of conserved mitochondrial proteins in D. discoideum.
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