The Flagellar Arginine Kinase in Trypanosoma brucei Is Important for Infection in Tsetse Flies

CHER-PHENG OOI, Brice Rotureau, Simonetta Gribaldo, Christina Georgikou, Daria Julkowska, Thierry Blisnick, Sylvie Perrot, Ines Subota, Philippe Bastin

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Abstract

African trypanosomes are flagellated parasites that cause sleeping sickness. Parasites are transmitted from one mammalian host to another by the bite of a tsetse fly. Trypanosoma brucei possesses three different genes for arginine kinase (AK) including one (AK3) that encodes a protein localised to the flagellum. AK3 is characterised by the presence of a unique amino-terminal insertion that specifies flagellar targeting. We show here a phylogenetic analysis revealing that flagellar AK arose in two independent duplication events in T. brucei and T. congolense, the two species of African trypanosomes that infect the tsetse midgut. In T. brucei, AK3 is detected in all stages of parasite development in the fly (in the midgut and in the salivary glands) as well as in bloodstream cells, but with predominance at insect stages. Genetic knockout leads to a slight reduction in motility and impairs parasite infectivity towards tsetse flies in single and competition experiments, both phenotypes being reverted upon expression of an epitope-tagged version of AK3. We speculate that this flagellar arginine kinase is important for T. brucei infection of tsetse, especially in the context of mixed infections and that its flagellar targeting relies on a system equivalent to that discovered for calflagins, a family of trypanosome flagellum calcium binding proteins.
Original languageEnglish
Article numbere0133676
JournalPLoS ONE
Volume10
Issue number7
DOIs
Publication statusPublished - 28 Jul 2015

Keywords

  • Flagellar Arginine Kinase
  • Trypanosoma brucei
  • Tsetse Flies

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    OOI, CHER-PHENG., Rotureau, B., Gribaldo, S., Georgikou, C., Julkowska, D., Blisnick, T., Perrot, S., Subota, I., & Bastin, P. (2015). The Flagellar Arginine Kinase in Trypanosoma brucei Is Important for Infection in Tsetse Flies. PLoS ONE, 10(7), [e0133676]. https://doi.org/10.1371/journal.pone.0133676