OsmC and incomplete glycine decarboxylase complex mediate reductive detoxification of peroxides in hydrogenosomes of Trichomonas vaginalis

Molecular and Biochemical Parasitology
Eva NývltováIvan Hrdý

Abstract

Osmotically inducible protein (OsmC) and organic hydroperoxide resistance protein (Ohr) are small, thiol-dependent peroxidases that comprise a family of prokaryotic protective proteins central to the defense against deleterious effects of organic hydroperoxides, which are reactive molecules that are formed during interactions between the host immune system and pathogens. Trichomonas vaginalis, a sexually transmitted parasite of humans, possesses OsmC homologues in its hydrogenosomes, anaerobic mitochondrial organelles that harbor enzymes and pathways that are sensitive to oxidative damage. The glycine decarboxylase complex (GDC), which consists of four proteins (i.e., L, H, P and T), is in eukaryotes exclusively mitochondrial enzymatic system that catalyzes oxidative decarboxylation and deamination of glycine. However, trichomonad hydrogenosomes contain only the L and H proteins, whose physiological functions are unknown. Here, we found that the hydrogenosomal L and H proteins constitute a lipoate-dependent redox system that delivers electrons from reduced nicotinamide adenine dinucleotide (NADH) to OsmC for the reductive detoxification of peroxides. Our searches of genome databases revealed that, in addition to prokaryotes, ho...Continue Reading

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Citations

Aug 25, 2017·Molecular Microbiology·Gustavo A AfanadorSean T Prigge
May 6, 2017·Nature Ecology & Evolution·Michelle M LegerAndrew J Roger
Feb 3, 2021·Molecular Biology and Evolution·Vojtěch ŽárskýJan Tachezy
Sep 12, 2018·Trends in Parasitology·Herbert J SantosTomoyoshi Nozaki
Nov 8, 2017·Current Biology : CB·Andrew J RogerRyoma Kamikawa

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