Origin and evolution of metabolic sub-cellular compartmentalization in eukaryotes.

Area of Science:

• Cell Biology
• Evolutionary Biology
• Proteomics

Background:

• Eukaryotic cells exhibit extensive subcellular compartmentalization, a feature present in their earliest ancestors.
• The precise origins and early evolutionary trajectories of cellular organelles remain largely unknown.
• Proteins synthesized in the cytosol are sorted to specific subcellular locations via regulated pathways, which can vary dynamically.

Purpose of the Study:

• To review current themes concerning the origin and evolution of organellar proteomes.
• To highlight the evolutionary retargeting of proteins and its impact on reconstructing organelle evolution.
• To focus specifically on the evolutionary studies of mitochondrial and peroxisomal proteomes.

Main Methods:

• Review of existing literature on organellar proteomes and evolutionary studies.
• Analysis of proteomic data to understand protein localization.
• Comparative evolutionary studies to trace the history of organelle-specific proteins.

Main Results:

• Subcellular compartmentalization is ancient, dating back to the last eukaryotic common ancestor.
• Evolutionary retargeting of proteins across various organelles is a widespread phenomenon in eukaryotes.
• Extensive proteomic and evolutionary data are available for mitochondria and peroxisomes.

Conclusions:

• Reconstructing organelle origins is challenging due to the dynamic nature of protein sorting and rampant evolutionary retargeting.
• Mitochondrial and peroxisomal proteome evolution provides key insights into broader organelle evolution.
• Understanding these evolutionary processes is crucial for deciphering eukaryotic cell complexity.