Special delivery from mitochondria to peroxisomes.

Inter-organellar communication and interactions are necessary and accepted consequences of the segregation of biochemical functions into subcellular organelles. Recently, Heidi McBride and her collaborators found a novel link between mitochondria and peroxisomes in their discovery of mitochondria-derived vesicles (MDVs), which appear to fuse with a fraction of pre-existing peroxisomes in mammalian cells. We discuss the potential role of this vesicle population in the context of pathways for the exchange of metabolites and/or macromolecules between these compartments.

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