Add time:07/27/2019         Source:sciencedirect.com

Fosmidomycin is a natural antibiotic with promising IspC (DXR, 1-deoxy-d-xylulose-5-phosphate reductoisomerase) inhibitory activity. This enzyme catalyzes the first committed step of the non-mevalonate isoprenoid biosynthesis pathway, which is essential in Plasmodium falciparum and Mycobacterium tuberculosis. Mainly as a result of its high polarity, fosmidomycin displays suboptimal pharmacokinetic properties. Furthermore, fosmidomycin is inactive against M. tuberculosis as a result of its inability to penetrate the bacterial cell wall. Temporarily masking the phosphonate moiety as a prodrug has the potential to solve both issues. We report the application of two amino acid based prodrug approaches on a fosmidomycin surrogate. Conversion of the phosphonate moiety into tyrosine-derived esters increases the in vitro activity against asexual blood stages of P. falciparum, while phosphonodiamidate prodrugs display promising antitubercular activities. Selected prodrugs were tested in vivo in a P. berghei malaria mouse model. These results indicate good in vivo antiplasmodial potential.

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