Complex I (NADH dehydrogenase) is the first enzyme in the respiratory chain. It catalyses the electron transfer from NADH to ubiquinone that is associated with proton pumping out of the matrix. In this study, we characterized NADH dehydrogenase activity in seven monoxenous trypanosomatid species: Blechomonas ayalai, Herpetomonas tarakana, Kentomonas sorsogonicus, Leptomonas seymouri, Novymonas esmeraldas, Sergeia podlipaevi and Wallacemonas raviniae. We also investigated the subunit composition of the complex I in dixenous Phytomonas serpens, in which its presence and activity have been previously documented. In addition to P. serpens, the complex I is functionally active in N. esmeraldas and S. podlipaevi. We also identified 24-32 subunits of the complex I in individual species by using mass spectrometry. Among them, for the first time, we recognized several proteins of the mitochondrial DNA origin.

Department of Biochemistry Faculty of Natural Sciences Comenius University Bratislava Slovakia

Faculty of Science Life Science Research Centre University of Ostrava Ostrava Czech Republic

Institute of Chemistry Slovak Academy of Sciences Bratislava Slovakia

Martsinovsky Institute of Medical Parasitology Tropical and Vector Borne Diseases Sechenov University Moscow Russia

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