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Malaria Journal
Published in: Malaria Journal 1/2017

Open Access 01-12-2017 | Research

Identification of O-GlcNAcylated proteins in Plasmodium falciparum

Authors: Mattis Kupferschmid, Moyira Osny Aquino-Gil, Hosam Shams-Eldin, Jörg Schmidt, Nao Yamakawa, Frédéric Krzewinski, Ralph T. Schwarz, Tony Lefebvre

Published in: Malaria Journal | Issue 1/2017

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Abstract

Background

Post-translational modifications (PTMs) constitute a huge group of chemical modifications increasing the complexity of the proteomes of living beings. PTMs have been discussed as potential anti-malarial drug targets due to their involvement in many cell processes. O-GlcNAcylation is a widespread PTM found in different organisms including Plasmodium falciparum. The aim of this study was to identify O-GlcNAcylated proteins of P. falciparum, to learn more about the modification process and to understand its eventual functions in the Apicomplexans.

Methods

The P. falciparum strain 3D7 was amplified in erythrocytes and purified. The proteome was checked for O-GlcNAcylation using different methods. The level of UDP-GlcNAc, the donor of the sugar moiety for O-GlcNAcylation processes, was measured using high-pH anion exchange chromatography. O-GlcNAcylated proteins were enriched and purified utilizing either click chemistry labelling or adsorption on succinyl-wheat germ agglutinin beads. Proteins were then identified by mass-spectrometry (nano-LC MS/MS).

Results

While low when compared to MRC5 control cells, P. falciparum disposes of its own pool of UDP-GlcNAc. By using proteomics methods, 13 O-GlcNAcylated proteins were unambiguously identified (11 by click-chemistry and 6 by sWGA-beads enrichment; 4 being identified by the 2 approaches) in late trophozoites. These proteins are all part of pathways, functions and structures important for the parasite survival. By probing clicked-proteins with specific antibodies, Hsp70 and α-tubulin were identified as P. falciparum O-GlcNAc-bearing proteins.

Conclusions

This study is the first report on the identity of P. falciparum O-GlcNAcylated proteins. While the parasite O-GlcNAcome seems close to those of other species, the structural differences exhibited by the proteomes provides a glimpse of innovative therapeutic paths to fight malaria. Blocking biosynthesis of UDP-GlcNAc in the parasites is another promising option to reduce Plasmodium life cycle.
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Metadata
Title
Identification of O-GlcNAcylated proteins in Plasmodium falciparum
Authors
Mattis Kupferschmid
Moyira Osny Aquino-Gil
Hosam Shams-Eldin
Jörg Schmidt
Nao Yamakawa
Frédéric Krzewinski
Ralph T. Schwarz
Tony Lefebvre
Publication date
01-12-2017
Publisher
BioMed Central
Published in
Malaria Journal / Issue 1/2017
Electronic ISSN: 1475-2875
DOI
https://doi.org/10.1186/s12936-017-2131-2

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