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- W2138897500 abstract "The flow of electrons the terminal oxidases present in the bloodstream and procyclic trypomastigotes of Trypanosoma brucei LUMP 1026 has been investigated by the use of salicylhydroxamic acid (SHAM) and cyanide. Respiration in bloodstream trypomastigotes was completely inhibited by 0.5 mM SHAM with a Ki below 10 microM. The Ki for SHAM in procyclic trypomastigotes was 70 microM. In procyclic trypomastigotes there are at least three terminal oxidases of which the two major ones are cytochrome aa3 oxidase, sensitive to cyanide inhibition, and alpha-glycerophosphate oxidase (GPO), sensitive to SHAM inhibition. These two oxidases contribute 60 and 30%, respectively, to total cell respiration. Inhibition of the cytochrome system with cyanide causes an increase in the flow of electrons through the GPO system, and inhibition of the GPO system with SHAM stimulates electron flow in the cytochrome system. Succinate oxidation in the mitochondrial fraction is partially inhibited by SHAM and this SHAM-sensitive respiration is not inhibited by antimycin A. The kinetic data of respiration by procyclic trypomastigotes fit a model proposed by Bahr and Bonner to determine the maximum rates of two competing electron transport pathways. It is concluded that the electron transport chain in T. brucei is branched." @default.
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- W2138897500 date "1980-01-01" @default.
- W2138897500 modified "2023-10-16" @default.
- W2138897500 title "Evidence for a branched electron transport chain in Trypanosoma brucei" @default.
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- W2138897500 doi "https://doi.org/10.1016/0166-6851(80)90038-9" @default.
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