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Authors: Preetha Rajaraman
Co-Authors: Dey, Bindu
Majumder, Partha P
Mayor, Satyajit
Pillai, M Radhakrishna
Ramaswamy, S
Shaha, Chandrima
Johnson, Maureen
Sivaram, Sudha
Trimble, Edward L
Harlow, Edward E
VijayRaghavan, K
Title: First international workshops on Provocative Questions (PQ) in cancerresearch, October–November 2014, New Delhi, Bengaluru, andThiruvananthapuram, India
Publisher: Elsevier Ltd.
Publication Date: Nov-2013
Abstract: Lower eukaryotes like the kinetoplastid parasites are good models to study evolution of cellular pathways during steps to eukaryogenesis. In this study, a kinetoplastid parasite, Leishmania donovani, was used to understand the process of mitochondrial translocation of a nucleus-encoded mitochondrial protein, the mitochondrial tryparedoxin peroxidase (mTXNPx). We report the presence of an N-terminal cleavable mitochondrial targeting signal (MTS) validated through deletion and grafting experiments. We also establish a novel finding of calmodulin (CaM) binding to the MTS of mTXNPx through specific residues. Mutation of CaM binding residues, keeping intact the residues involved in mitochondrial targeting and biochemical inhibition of CaM activity both in vitro and in vivo, prevented mitochondrial translocation. Through reconstituted import assays, we demonstrate obstruction of mitochondrial translocation either in the absence of CaM or Ca(2+) or in the presence of CaM inhibitors. We also demonstrate the prevention of temperature-driven mTXNPx aggregation in the presence of CaM. These findings establish the idea that CaM is required for the transport of the protein to mitochondria through maintenance of translocation competence posttranslation.
Issue No: 22
Appears in Collections:Cell Death Differential Research, Publications

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