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Published on: June 22, 2017
Identification and characterization of Letm1 gene in Toxoplasma gondii
Le Chang1, Xichen Zhang1, Pengtao Gong1
1Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, China.
Abstract:
Toxoplasma gondii is an obligate intracellular protozoan that causes toxoplasmosis. Previous studies have shown that the perturbation of mitochondrial metabolism in T. gondii results in growth deficiency in host cells and lack of virulence in animals. Members of this Letm1 protein family are inner mitochondrial membrane proteins which play a role in potassium and hydrogen ion exchange. Letm1 has not been characterized in T. gondii. In this study, a potential TgLetm1 gene (TgGT1_288400) with Letm1-like protein domain coding sequence was identified in T. gondii. Indirect immunofluorescence assays suggested that TgLetm1 localized to the mitochondria in tachyzoites, as indicated by the colocalization with mitochondrial marker Mitotracker. TgLetm1 was found in the membrane fraction by western blot analysis. To investigate the role of TgLetm1 in T. gondii, we generated a tetracycline-inducible TgLetm1-knock-down mutant. The conditional deletion of TgLetm1 resulted in mitochondrial swelling. Functional studies showed that the conditional deletion of TgLetm1 resulted in growth inhibition, deficiency in invasion and replication, and lack of virulence in mice.
Insights
Toxoplasma gondii Letm1 (TgLetm1) is crucial for parasite survival. Knocking down TgLetm1 impairs mitochondrial function, leading to reduced growth, invasion, replication, and virulence in mice.
Area of Science:
- Parasitology
- Molecular Biology
- Mitochondrial Biology
Background:
- Toxoplasma gondii causes toxoplasmosis; mitochondrial metabolism is vital for its growth and virulence.
- Letm1 proteins are inner mitochondrial membrane proteins involved in ion transport.
- The role of Letm1 in T. gondii remained uncharacterized.
Purpose of the Study:
- To identify and characterize the Letm1 homolog in T. gondii (TgLetm1).
- To investigate the function of TgLetm1 in T. gondii growth, invasion, replication, and virulence.
Main Methods:
- Identification of the TgLetm1 gene (TgGT1_288400).
- Indirect immunofluorescence assays and Mitotracker staining for subcellular localization.
- Western blot analysis to determine protein fractionation.
- Generation of a tetracycline-inducible TgLetm1-knock-down mutant.
Main Results:
- TgLetm1 was localized to the mitochondria in T. gondii tachyzoites.
- Conditional deletion of TgLetm1 led to mitochondrial swelling.
- Knock-down of TgLetm1 resulted in significant growth inhibition, impaired invasion and replication, and reduced virulence in a mouse model.
Conclusions:
- TgLetm1 is a mitochondrion-localized protein essential for T. gondii survival.
- TgLetm1 plays a critical role in maintaining mitochondrial integrity and parasite infectivity.
- Targeting TgLetm1 could be a potential strategy for treating toxoplasmosis.
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