Mitochondrial Metabolism in Malaria Parasites

Malaria parasites of the genus Plasmodium rely on mitochondria primarily to support energy generation, redox balance and biosynthetic pathways throughout their complex life cycle. Unlike typical eukaryotic mitochondria, the organelle in Plasmodium has a highly reduced genome yet retains a functional electron transport chain (ETC) that is essential for de novo pyrimidine synthesis via dihydroorotate dehydrogenase, as well as for ATP generation under certain life stages. In the asexual blood stages, energy demands are largely met by glycolysis, with mitochondrial function contributing to pyrimidine supply and maintenance of membrane potential rather than bulk ATP production. In contrast, during differentiation into mosquito-transmissible gametocytes, mitochondrial cristae proliferate and ETC activity rises, reflecting heightened reliance on oxidative phosphorylation to fuel gametogenesis. Central carbon metabolism within the organelle integrates inputs from glucose and glutamine, feeding into a branched tricarboxylic acid (TCA) cycle that provides intermediates for biosynthesis and redox cofactors. Lipid constituents such as cardiolipin display stage-specific composition, influencing membrane architecture and ETC complex stability. The divergent structure and composition of respiratory complexes, together with stage-specific metabolic remodelling, underscore the mitochondrion as a validated target for antimalarial therapies aimed at disrupting parasite proliferation and transmission.

Research from Nature Portfolio

Recent work has elucidated the dynamic organisation of mitochondrial complexes across parasite stages. A proteomic mapping of respiratory chain assemblies revealed clade-specific subunits and marked enrichment of complexes in gametocytes, correlating with the presence of well-developed cristae and a shift towards oxidative phosphorylation. This study highlighted novel parasite-specific additions to each complex that may underpin selective inhibition. Complementing this, functional analyses of ATP synthesis demonstrated that mitochondrial respiration is indispensable for gametocyte maturation and fertilisation events in the mosquito vector. Using sex-specific reporters and ratiometric ATP sensors, the research showed that female gametocytes maintain higher mitochondrial activity than males and that disruption of mitochondrial ATP synthase abrogates transmission. These findings emphasise the mitochondrion’s critical role in the parasite’s transmission cycle and provide a rationale for targeting gametocyte-specific mitochondrial processes as a blockade to malaria spread.

Mitochondrial Metabolism in Malaria Parasites publication trend

The graph below shows the total number of articles in mitochondrial metabolism in malaria parasites across all publications each year (not limited to Nature Index journals).

Technical terms

Electron transport chain (ETC): A series of protein complexes in the inner mitochondrial membrane that transfer electrons to generate a proton gradient used to synthesise ATP.

Tricarboxylic acid (TCA) cycle: A central metabolic pathway in mitochondria that oxidises acetyl-CoA to produce energy, reducing equivalents and biosynthetic precursors.

Cristae: Invaginations of the inner mitochondrial membrane that increase surface area for respiratory complexes and ATP synthesis.

Gametocytes: Sexual blood-stage forms of Plasmodium that differentiate into male and female gametes for transmission to the mosquito vector.

Cardiolipin: A unique phospholipid localised to the inner mitochondrial membrane, crucial for stability and function of respiratory complexes.

References

1. Unique Properties of Apicomplexan Mitochondria. Annual Review of Microbiology (2023).
2. Mitochondrial ATP synthesis is essential for efficient gametogenesis in Plasmodium falciparum. Communications Biology (2024).
3. A patatin-like phospholipase is important for mitochondrial function in malaria parasites. mBio (2023).
4. Plasmodium falciparum Mitochondrial Complex III, the Target of Atovaquone, Is Essential for Progression to the Transmissible Sexual Stages. International Journal of Molecular Sciences (2024).
5. Stage-Specific Changes in Plasmodium Metabolism Required for Differentiation and Adaptation to Different Host and Vector Environments. PLOS Pathogens (2016).
6. Composition and stage dynamics of mitochondrial complexes in Plasmodium falciparum. Nature Communications (2021).
7. Mitochondrial metabolism of sexual and asexual blood stages of the malaria parasite Plasmodium falciparum. BMC Biology (2013).