Depression of Plasmodium falciparum dihydroorotate dehydrogenase activity in in vitro culture by tetracycline.
The activity of Plasmodium falciparum dihydroorotate dehydrogenase, a particulate, electron transport-linked enzyme involved in de novo pyrimidine synthesis, was depressed when the parasite was cultured in the presence of a therapeutic concentration of tetracycline over a 96 h period. There was no direct inhibitory effect of the antibiotic on the enzyme activity. The activity of glutamate dehydrogenase, which is cytoplasmic in the parasite, was unaffected by tetracycline over the same period. Dihydroorotate dehydrogenase activity was substantially recovered when electron acceptors were added. It is suggested that the effect of tetracycline is manifested at the level of the dehydrogenase and/or the electron transport chain linked to this enzyme.
Prapunwattana
P
P
Department of Biochemistry, Faculty of Science, Mahidol University, Bangkok, Thailand.
O'Sullivan
W J
WJ
Yuthavong
Y
Y
D000818:Animals; D003864:Depression, Chemical; D004081:Dihydroorotate Oxidase / Q000032:analysis*; D004579:Electron Transport / Q000187:drug effects; D005969:Glutamate Dehydrogenase / Q000032:analysis; D008928:Mitochondria / Q000187:drug effects / Q000201:enzymology; D010088:Oxidoreductases / Q000032:analysis*; D010963:Plasmodium falciparum / Q000187:drug effects / Q000201:enzymology*; D013752:Tetracycline / Q000494:pharmacology*
D010088:Oxidoreductases; D004081:Dihydroorotate Oxidase; D005969:Glutamate Dehydrogenase; D013752:Tetracycline