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• W1968879985 abstract "Pteridine reductase 1 (PTR1) is an essential enzyme of pterin and folate metabolism in the protozoan parasite Leishmania. The present work is focused on the degradation of PTR1 during growth phase in Leishmania donovani. Western blot analysis with PTR1-GFP transfected promastigotes revealed that PTR1 protein was degraded in the stationary phase of growth at the time when the parasites were undergoing metacyclogenesis. Fluorescence microscopy revealed cytoplasmic localization of GFP tagged protein extending to the flagellum in these stationary phase promastigotes, implying that degradation of the protein was not by the usual multivesicular tubule lysosome (MVT) pathway. A probable destruction box of nine amino acids Q63ADLSNVAK71 and possible lysine residue K156 was identified in L. donovani PTR1 to be the site for ubiquitin conjugation. This suggests that PTR1 degradation during the stationary phase of growth is mediated by the proteasome. This leads to lower levels of H4-biopterin, which favors metacyclogenesis, and subsequently results in a highly infective stage of the parasite. Therefore, this finding has importance to identify new target molecule like the proteasome for therapeutic intervention." @default.
• W1968879985 created "2016-06-24" @default.
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• W1968879985 date "2007-06-01" @default.
• W1968879985 modified "2023-10-16" @default.
• W1968879985 title "Degradation of pteridine reductase 1 (PTR1) enzyme during growth phase in the protozoan parasite Leishmania donovani" @default.
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• W1968879985 doi "https://doi.org/10.1016/j.exppara.2006.12.008" @default.
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