Laine, L. M., Biddau, M., Byron, O., and Müller, S. (2014) Biochemical and structural characterisation of the apicoplast dihydrolipoamide dehydrogenase of Plasmodium falciparum. Bioscience Reports, 35(1), e00171. (doi:10.1042/BSR20140150) (PMID:25387830) (PMCID:PMC4293902)
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Pyruvate dehydrogenase complex (PDC) is a multi-enzyme complex comprising a decarboxylase (E1), a dihydrolipomide acetyltransferase (E2) and a dihydrolipoamide dehydrogenase (E3). PDC catalyses the decarboxylation of pyruvate and forms acetyl-CoA and NADH. In the human malaria parasite Plasmodium falciparum the single PDC is located exclusively in the apicoplast. Plasmodium PDC is essential for parasite survival in the mosquito vector and for late liver stage development in the human host, suggesting its suitability as a target for intervention strategies against malaria. Here, P. falciparum apicoplast E3 (PfaE3) was recombinantly expressed and characterised. Biochemical parameters were comparable with those determined for E3 from other organisms. A homology model for PfaE3 reveals an extra anti-parallel β-strand at the position where human E3 binding protein interacts with E3; a parasite-specific feature that may be exploitable for drug discovery against PDC. To assess the biological role of Pfae3,it was deleted from P. falciparum and although the mutants are viable, they displayed a highly synchronous growth phenotype during intra-erythrocytic development. The mutants also showed changes in the expression of some mitochondrial and antioxidant proteins suggesting that deletion of Pfae3 impacts on the parasite’s metabolic function with downstream effects on the parasite’s redox homeostasis and cell cycle.
|Glasgow Author(s) Enlighten ID:||Muller, Professor Sylke and Biddau, Mr Marco and Byron, Professor Olwyn|
|Authors:||Laine, L. M., Biddau, M., Byron, O., and Müller, S.|
|College/School:||College of Medical Veterinary and Life Sciences > Institute of Infection Immunity and Inflammation|
|Journal Name:||Bioscience Reports|
|Publisher:||Portland Press Ltd.|
|Copyright Holders:||Copyright © 2015 The Authors|
|First Published:||First published in Bioscience Reports 35(1):e00171|
|Publisher Policy:||Reproduced under a Creative Commons License|