The organization of purine and pyrimidine nucleotide biosynthesis in Sporozoa (Protozoa)]

Analysis of peculiarities in organization and functioning of metabolic ways of biosynthesis of purine and pyrimidine nucleotides in representatives of Sporozoa type has shown that molecular aftereffects of adaptation to intracellular parasitism in unicellular eukaryotes consists in the increase in the level of molecular organization, loss of some metabolic path ways and some enzymes, origin of a new metabolic system, a host-parasite one. Functioning of this system is achieved due to developing by the parasite mechanisms that are similar to the host's ones.