The human malaria parasite Plasmodium falciparum has distinct organelle-specific lipoylation pathways

Molecular Microbiology
Carsten Wrenger, Sylke Müller

Abstract

Lipoic acid is an essential cofactor of alpha-keto acid dehydrogenase complexes (KADHCs). This study shows that Plasmodium falciparum possesses two distinct lipoylation pathways that are found in separate subcellular localizations. Lipoic acid synthesis comprising lipoic acid synthase and lipoyl-ACP:protein N-lipoyl transferase is present in the parasite's apicoplast, whereas the second pathway consisting of lipoic acid protein ligase is located in the parasite's mitochondrion. The two localizations were established by overexpressing green fluorescent protein fusions of the N-terminal sequences of lipoic acid synthase and lipoic acid protein ligase in intraerythrocytic stages of P. falciparum. Northern and Western blot analyses revealed that the genes/proteins encoding lipoic acid synthase, lipoyl-ACP:protein N-lipoyl transferase and lipoic acid protein ligase are expressed maximally in the early and late stages of P. falciparum erythrocytic development. The functionality of the three proteins was proven by complementation of bacteria deficient in lipA and lipB. Our results show that P. falciparum possesses two independent pathways, with different locations, responsible for the post-translational modification of KADHCs. Both pa...Continue Reading

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