Mitochondrial energy metabolism in Eimeria spp. (MEM (Eimeria))

Mitochondrial energy metabolism in Eimeria species is a critical physiological process and a primary target for anticoccidial chemotherapy. Unlike their hosts, these apicomplexan parasites rely heavily on a specialized electron transport chain (ETC) not only for ATP production through oxidative phosphorylation but also for providing electrons to dihydroorotate dehydrogenase, an essential enzyme in the de novo pyrimidine biosynthesis pathway. The cytochrome bc1 complex (Complex III) is the most significant therapeutic node within this metabolism, serving as the binding site for several classes of drugs including quinolones and naphthoquinones. Inhibition of this pathway leads to a rapid collapse of the mitochondrial membrane potential, cessation of parasite replication, and eventual cell death. Because Eimeria species cause severe intestinal disease (coccidiosis) in poultry and livestock, targeting their unique mitochondrial features allows for selective toxicity with minimal impact on the host's metabolic functions. However, the high selection pressure from intensive drug use has led to the emergence of resistant strains, often characterized by single nucleotide polymorphisms in the mitochondrial cytochrome b gene.

Other names

Eimeria mitochondrial electron transport chainCoccidian mitochondrial respirationEimeria oxidative phosphorylation pathway

Inhibition of the mitochondrial electron transport chain, specifically targeting the cytochrome bc1 complex (Complex III) at the Qo site, which disrupts the membrane potential and halts ATP production and pyrimidine biosynthesis.