Abstract:
:A structure-guided design approach using a homology model of Plasmodium falciparum calcium-dependent protein kinase 1 (PfCDPK1) was used to improve the potency of a series of imidazopyridazine inhibitors as potential antimalarial agents. This resulted in high affinity compounds with PfCDPK1 enzyme IC50 values less than 10 nM and in vitro P. falciparum antiparasite EC50 values down to 12 nM, although these compounds did not have suitable ADME properties to show in vivo efficacy in a mouse model. Structural modifications designed to address the ADME issues, in particular permeability, were initially accompanied by losses in antiparasite potency, but further optimization allowed a good balance in the compound profile to be achieved. Upon testing in vivo in a murine model of efficacy against malaria, high levels of compound exposure relative to their in vitro activities were achieved, and the modest efficacy that resulted raises questions about the level of effect that is achievable through the targeting of PfCDPK1.
journal_name
J Med Chemjournal_title
Journal of medicinal chemistryauthors
Chapman TM,Osborne SA,Wallace C,Birchall K,Bouloc N,Jones HM,Ansell KH,Taylor DL,Clough B,Green JL,Holder AAdoi
10.1021/jm500342dsubject
Has Abstractpub_date
2014-04-24 00:00:00pages
3570-87issue
8eissn
0022-2623issn
1520-4804journal_volume
57pub_type
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