Development of <i>Toxoplasma gondii</i> Calcium-Dependent Protein Kinase 1 (<i>Tg</i>CDPK1) Inhibitors with Potent Anti-<i>Toxoplasma</i> Activity

Toxoplasmosis is a disease of prominent health concern that is caused by the protozoan parasite <i>Toxoplasma gondii</i>. Proliferation of <i>T. gondii</i> is dependent on its ability to invade host cells, which is mediated in part by calcium-dependent protein kinase 1 (CDPK1). We have developed ATP competitive inhibitors of <i>Tg</i>CDPK1 that block invasion of parasites into host cells, preventing their proliferation. The presence of a unique glycine gatekeeper residue in <i>Tg</i>CDPK1 permits selective inhibition of the parasite enzyme over human kinases. These potent <i>Tg</i>CDPK1 inhibitors do not inhibit the growth of human cell lines and represent promising candidates as toxoplasmosis therapeutics