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• W2068617414 abstract "Radiolabelling studies using tritiated ornithine, arginine and lysine, together with the relevant amino acid decarboxylase enzyme assays, indicate that the epimastigote stage of Trypanosoma cruzi is unable to synthesise significant amounts of putrescine and cadaverine de novo, compared to the amounts of these diamines scavenged from the growth medium. Radiolabelled putrescine is readily incorporated into spermidine, spermine and the trypanosomatid-specific polyamine-glutathione conjugate trypanothione (N1,N8-bis(glutathionyl)spermidine). Likewise, radiolabelled cadaverine is incorporated into the analogous polyamines aminopropylcadaverine, bis(aminopropyl)cadaverine and another major unidentified component. Subsequent studies showed this major component to be a novel polyamine-thiol conjugate whose structure was confirmed by chemical synthesis to be N1,N9-bis(glutathionyl)aminopropylcadaverine (homotrypanothione). Kinetic analyses using recombinant T. cruzi trypanothione reductase demonstrated that homotrypanothione disulphide is readily reduced by this enzyme with kinetic parameters similar to trypanothione disulphide, suggesting that it is a physiological substrate in vivo. Thus the epimastigote form of T. cruzi differs significantly from the African trypanosomes and Leishmania in (a) being unable to synthesise significant amounts of diamines de novo, (b) converting significant amounts of putrescine and cadaverine to spermine and bis(aminopropyl)cadaverine, respectively and (c) the ability to synthesise homotrypanothione as well as trypanothione. The implications of these findings with respect to the prospective chemotherapy of Chagas' disease are discussed." @default.
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• W2068617414 date "1994-12-01" @default.
• W2068617414 modified "2023-10-03" @default.
• W2068617414 title "Identification and Biosynthesis of N1,N9-Bis(Glutathionyl)Aminopropylcadaverine (Homotrypanothione) in Trypanosoma Cruzi" @default.
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• W2068617414 doi "https://doi.org/10.1111/j.1432-1033.1994.t01-1-01019.x" @default.
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