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Replication fork-stimulated eIF-4A from Plasmodium cynomolgi unwinds DNA in the 3' to 5' direction and is inhibited by DNA-interacting compounds.

Abstract
Plasmodium cynomolgi DEAD-box DNA helicase 45 (PcDDH45) is an ATP-dependent DNA-unwinding enzyme with intrinsic DNA-dependent ATPase activity and is highly homologous to eIF-4A. In this study, we have further characterized and tested the effect of various DNA-interacting compounds on the DNA-unwinding activity of PcDDH45. The results show that PcDDH45 translocates in the 3' to 5' direction along the bound strand, a replication fork-like structure of the substrate stimulates its DNA-unwinding activity, and it failed to unwind blunt-ended duplex DNA. Of various compounds tested, only cisplatin, 4',6'-diamidino-2-phenylindole, daunorubicin, and nogalamycin were inhibitory to the unwinding activity of PcDDH45 with apparent IC(50) values of 1.0, 4.0, 7.5, and 1.7 microM, respectively. These results suggest that the interaction of these compounds with duplex DNA generate a complex that probably impedes the translocation of PcDDH45, resulting in inhibition of unwinding activity. This study is one of the first to demonstrate the effect of various DNA-binding compounds on a malaria parasite DNA helicase and should make an important contribution to our better understanding of the nucleic acid transactions in the parasite.
AuthorsRenu Tuteja, Narendra Tuteja, Pawan Malhotra, Virander Singh Chauhan
JournalArchives of biochemistry and biophysics (Arch Biochem Biophys) Vol. 414 Issue 1 Pg. 108-14 (Jun 01 2003) ISSN: 0003-9861 [Print] United States
PMID12745261 (Publication Type: Journal Article)
Chemical References
  • Enzyme Inhibitors
  • Intercalating Agents
  • DNA
  • Eukaryotic Initiation Factor-4A
Topics
  • Animals
  • DNA (chemistry)
  • Enzyme Activation
  • Enzyme Inhibitors (chemistry)
  • Eukaryotic Initiation Factor-4A (analogs & derivatives, antagonists & inhibitors, chemistry, metabolism)
  • Intercalating Agents
  • Nucleic Acid Conformation
  • Plasmodium cynomolgi (chemistry, enzymology)
  • Substrate Specificity

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