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Pubmed ID :29684273
Publication Date : //

Interaction of α-Thymidine Inhibitors with Thymidylate Kinase from Plasmodium falciparum.


Plasmodium falciparum thymidylate kinase (PfTMK) is a critical enzyme in the de novo biosynthesis pathway of pyrimidine nucleotides. N-(5'-Deoxy-α-thymidin-5'-yl)- N'-[4-(2-chlorobenzyloxy)phenyl]urea was developed as an inhibitor of PfTMK and has been reported as an effective inhibitor of P. falciparum growth with an EC of 28 nM [Cui, H., et al. (2012) J. Med. Chem. 55, 10948-10957]. Using this compound as a scaffold, a number of derivatives were developed and, along with the original compound, were characterized in terms of their enzyme inhibition ( K) and binding affinity ( K). Furthermore, the binding site of the synthesized compounds was investigated by a combination of mutagenesis and docking simulations. Although the reported compound is indicated to be highly effective in its inhibition of parasite growth, we observed significantly lower binding affinity and weaker inhibition of PfTMK than expected from the reported EC. This suggests that significant structural optimization will be required for the use of this scaffold as an effective PfTMK inhibitor and that the inhibition of parasite growth is due to an off-target effect.

Authors : Chen Mengshen David , Sinha Kaustubh , Rule Gordon S , Ly Danith H ,

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