Abstract
An important issue facing global health today is the need for new, effective and affordable drugs against malaria, particularly in resource-poor countries. Moreover, the currently available antimalarials are limited by factors ranging from parasite resistance to safety, compliance, cost and the current lack of innovations in medicinal chemistry. Depletion of polyamines in the intraerythrocytic phase of P. falciparum is a promising strategy for the development of new antimalarials since intracellular levels of putrescine, spermidine and spermine are increased during cell proliferation. S-adenosyl-methionine-decarboxylase (AdoMETDC) is a key enzyme in the biosynthesis of spermidine. The AdoMETDC inhibitor CGP 48664A, known as SAM486A, inhibited the separately expressed plasmodial AdoMETDC domain with a Km i of 3 μM resulting in depletion of spermidine. Spermidine is an important precursor in the biosynthesis of hypusine. This prompted us to investigate a downstream effect on hypusine biosynthesis after inhibition of AdoMETDC. Extracts from P. falciparum in vitro cultures that were treated with 10 μM SAM 486A showed suppression of eukaryotic initiation factor 5A (eIF-5A) in comparison to the untreated control in two-dimensional gel electrophoresis. Depletion of eIF-5A was also observed in Western blot analysis with crude protein extracts from the parasite after treatment with 10 μM SAM486A. A determination of the intracellular polyamine levels revealed an approximately 27% reduction of spemidine and a 75% decrease of spermine while putrescine levels increased to 36%. These data suggest that inhibition of AdoMetDc provides a novel strategy for eIF-5A suppression and the design of new antimalarials.
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Abbreviations
- AdoMetDC:
-
S-adenosylmethionine decarboxylase
- EIF-5A:
-
Eukaryotic initiation factor 5A
- ODC:
-
Ornithine decarboxylase
- DHS:
-
Deoxyhypusine synthase
- DOHH:
-
Deoxyhypusine hydroxylase
- SAM486A:
-
4-amidinoindan-1-one-2′-amidinohydrazone
- kDa:
-
Kilodalton
- p.i.:
-
Post infection
- RBC:
-
Red blood cells
- Put:
-
Putescine
- Spd:
-
Spermidine
- Spm:
-
Spermine
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Acknowledgments
The compound SAM486A was kindly provided by Novartis Pharma AG Basel. This work was supported in part by grants from the German Research Foundation to A. H. and J. H.
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Blavid, R., Kusch, P., Hauber, J. et al. Down-regulation of hypusine biosynthesis in plasmodium by inhibition of S-adenosyl-methionine-decarboxylase. Amino Acids 38, 461–469 (2010). https://doi.org/10.1007/s00726-009-0405-x
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DOI: https://doi.org/10.1007/s00726-009-0405-x