Abstract
Regulation of mitochondrial calcium import is less understood in evolutionarily distinct protozoan parasites, such as Leishmania, as some of the mitochondrial calcium uniporter complex proteins are either missing or functionally diverged. Here, we show that Actin-related protein4 (ARP4), localizes exclusively into the Leishmania mitochondrion and depletion of this protein causes cells to accumulate calcium in the mitochondrion. The ARP4 depleted cells show increased activation of pyruvate dehydrogenase and production of ATP. Overall, our results indicate that ARP4 negatively regulates calcium uptake in the Leishmania mitochondrion.
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