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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
immunology and microbiology
Mitochondrial localization of the threonine peptidase PfHslV, a ClpQ ortholog in Plasmodium falciparum
International Journal for Parasitology, Volume 40, No. 13, Year 2010
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Description
Plasmodium falciparum belongs to a group of eukaryotes expressing an ortholog of the prokaryotic T1-threonine peptidase, heat shock locus V (HslV). Bacterial HslV is a particularly well studied protease, due to its structural and biochemical similarity to the eukaryotic proteasome. Plasmodium falciparum HslV (PfHslV) is expressed in schizonts and merozoites of the asexual blood stage. Strong sequence conservation between plasmodial species, absence of HslV homologs in the human genome, and availability of specific inhibitors led us to explore its function and potential use as a drug target. In a first step, we investigated localization of PfHslV, using a bioinformatics approach and a transgenic P. falciparum line expressing a PfHslV-enhanced yellow fluorescent protein (EYFP) fusion protein from the endogenous pfhslV locus. PfHslV-EYFP was found in the mitochondrial matrix under fluorescence and immunoelectron microscopy. Endogenous, non-modified PfHslV was present in purified mitochondria and interference with mitochondrial membrane potential by drug treatment led to impairment of PfHslV processing. Import of heterologous EYFP into the plasmodial mitochondrion is mediated by the N-terminal 37 amino acids of PfHslV. PfHslV's targeting sequence is also functional in human cells, demonstrating strong conservation of mitochondrial targeting in eukaryotes. In conclusion, our data shows that PfHslV is located to the plasmodial mitochondrion and presumably has vital function within this organelle which makes it an attractive target for interventions. © 2010 Australian Society for Parasitology Inc.
Authors & Co-Authors
Tschan, Serena C.
Germany, Tubingen
Eberhard Karls Universität Tübingen
Kreidenweiss, Andrea
Germany, Tubingen
Eberhard Karls Universität Tübingen
Stierhof, York Dieter
Germany, Tubingen
Eberhard Karls Universität Tübingen
Fendel, Rolf
Germany, Tubingen
Eberhard Karls Universität Tübingen
Mordmüller, Benjamin G.
Germany, Tubingen
Eberhard Karls Universität Tübingen
Statistics
Citations: 23
Authors: 5
Affiliations: 1
Identifiers
Doi:
10.1016/j.ijpara.2010.05.006
ISSN:
00207519