کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5915685 | 1163321 | 2011 | 5 صفحه PDF | دانلود رایگان |
The requirement of complex I (NADH:ubiquionone oxidoreductase) for respiration in Trypanosoma brucei is controversial. Recent identification of homologues of its subunits in mitochondrial proteome resolved a question of its presence or absence. However, with one exception, no data have been available concerning the function(s) of complex I or its subunits. Here we present a functional RNAi study of three (NUBM, NUKM, NUEM) putative subunits of this complex. Although no changes were detected in growth, mitochondrial membrane potential or reactive oxygen species production in cell lines depleted for target transcript, the NUBM and NUKM RNAi knock-downs showed decreased specific NADH:ubiquinone oxidoreductase activity. Moreover, glycerol gradients of all cell lines revealed the presence of two distinct peaks of NADH dehydrogenase activity, with shifted sensitivity to inhibitors of complex I upon RNAi induction. Thus complex I is not only present in the procyclic stage of T. brucei 29-13 strain, but it does participate in electron transport chain.
82Research highlightsⶠRNA interference knock-down of three putative subunits of complex I. ⶠLack of change of growth, membrane potential and ROS production. ⶠLimited decrease upon RNAi of NADH dehydrogenase activity. ⶠTwo separate peaks of NADH dehydrogenase activity in glycerol gradients.
Journal: Molecular and Biochemical Parasitology - Volume 175, Issue 2, February 2011, Pages 196-200