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Complex I of Trypanosomatidae: does it exist?

Fred R Opperdoes1, Paul A M Michels

  • 1de Duve Institute and Université catholique de Louvain, Avenue Hippocrate 74, Brussels, Belgium. fred.opperdoes@uclouvain.be

Trends in Parasitology
|June 7, 2008
PubMed
Summary
This summary is machine-generated.

The composition of complex I (NADH dehydrogenase) in Trypanosomatidae is clarified. This study predicts a 19-subunit complex, larger than bacterial but smaller than eukaryotic forms, lacking proton extrusion capabilities.

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Area of Science:

  • Mitochondrial biochemistry
  • Bioinformatics
  • Parasitology

Background:

  • The existence and structure of complex I (NADH dehydrogenase) in Trypanosomatidae have been uncertain.
  • Previous biochemical studies identified some subunits, but the complete complex composition remained unknown.

Purpose of the Study:

  • To review existing literature on Trypanosomatidae mitochondrial complex I.
  • To predict the composition of a putative complex I in Trypanosomatidae using bioinformatic analysis.

Main Methods:

  • Literature review of mitochondrial activity in Trypanosomatidae.
  • Bioinformatic analysis for predicting protein complex composition.

Main Results:

  • A putative complex I in Trypanosomatidae consists of at least 19 subunits with a minimum mass of 660 kDa.
  • The predicted complex is larger than bacterial complex I but smaller than typical eukaryotic mitochondrial complex I.
  • All electron transport subunits are present, but key membrane subunits for proton extrusion are absent.

Conclusions:

  • The predicted Trypanosomatidae complex I appears to be involved in electron transport but not energy transduction (proton extrusion).
  • This finding offers insights into the unique bioenergetics of Trypanosomatidae mitochondria.