Trypanosome alternative oxidase: from molecule to function.
Trypanosome alternative oxidase (TAO) is the cytochrome-independent terminal oxidase of the mitochondrial electron transport chain. TAO is a diiron protein that transfers electrons from ubiquinol to oxygen, reducing the oxygen to water. The mammalian bloodstream forms of Trypanosoma brucei depend solely on TAO for respiration. The inhibition of TAO by salicylhydroxamic acid (SHAM) or ascofuranone is trypanocidal. TAO is present at a reduced level in the procyclic form of T. brucei, where it is engaged in respiration and is also needed for developmental processes. Alternative oxidases similar to TAO have been found in a wide variety of organisms but not in mammals, thus rendering TAO an important chemotherapeutic target for African trypanosomiasis.
Chaudhuri
Minu
M
Division of Microbial Pathogenesis and Immune Response, Department of Biomedical Sciences, Meharry Medical College, Nashville, TN 37208, USA. mchaudhuri@mmc.edu
Ott
Robert Daniel
RD
Hill
George C
GC
D000818:Animals; D004579:Electron Transport; D004791:Enzyme Inhibitors / Q000627:therapeutic use*; D006801:Humans; D024101:Mitochondrial Proteins; D010088:Oxidoreductases / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D010100:Oxygen / Q000378:metabolism*; D010940:Plant Proteins; D014344:Trypanocidal Agents / Q000627:therapeutic use*; D014345:Trypanosoma / Q000201:enzymology* / Q000378:metabolism / Q000502:physiology; D014346:Trypanosoma brucei brucei / Q000201:enzymology / Q000378:metabolism / Q000502:physiology; D014353:Trypanosomiasis, African / Q000188:drug therapy / Q000517:prevention & control; D000099188:Alternative Oxidase
D004791:Enzyme Inhibitors; D024101:Mitochondrial Proteins; D010088:Oxidoreductases; D010100:Oxygen; D010940:Plant Proteins; D014344:Trypanocidal Agents; D000099188:Alternative Oxidase