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Pathogens 2018, 7(2), 33;

Acidocalcisome-Mitochondrion Membrane Contact Sites in Trypanosoma brucei

Center for Tropical and Emerging Global Diseases, University of Georgia, Athens, GA 30602, USA
Department of Cellular Biology, University of Georgia, Athens, GA 30602, USA
Author to whom correspondence should be addressed.
Received: 6 February 2018 / Revised: 13 March 2018 / Accepted: 14 March 2018 / Published: 22 March 2018
(This article belongs to the Special Issue Trypanosoma brucei)
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Membrane contact sites are regions of close apposition between two organelles, typically less than 30 nanometers apart, that facilitate transfer of biomolecules. The presence of contact sites has been demonstrated in yeast, plants, and mammalian cells. Here, we investigated the presence of such contact sites in Trypanosoma brucei. In mammalian cells, endoplasmic reticulum-mitochondria contact sites facilitate mitochondrial uptake of Ca2+ released by the ER-located inositol 1,4,5-trisphosphate receptor (InsP3R). However, the InsP3R in trypanosomes localizes to acidocalcisomes, which serve as major Ca2+ stores in these parasites. In this work, we have used super-resolution structured illumination microscopy and electron microscopy to identify membrane contact sites that exist between acidocalcisomes and mitochondria. Furthermore, we have confirmed the close association of these organelles using proximity ligation assays. Characterization of these contact sites may be a necessary starting point towards unraveling the role of Ca2+ in regulating trypanosome bioenergetics. View Full-Text
Keywords: membrane contact sites; calcium signaling; trypanosomes membrane contact sites; calcium signaling; trypanosomes

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Ramakrishnan, S.; Asady, B.; Docampo, R. Acidocalcisome-Mitochondrion Membrane Contact Sites in Trypanosoma brucei. Pathogens 2018, 7, 33.

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