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Toward a better drug against malaria
Date:6/6/2014

in form a three-dimensional pocket. The molecule of the active substance fits perfectly into this pocket, binding to amino acids at numerous positions. These interactions are crucial for the effect atovaquone has in Plasmodium cells, ultimately leading to the death of the pathogen. The researchers conducted a protein sequence analysis, revealing that most of these docking sites are identical in the pathogen, baker's yeast and in human cells. Atovaquone forms several bonds that are specific to the Plasmodium protein in the open area of the binding pocket. In addition, the structural analysis revealed the molecular basis of resistances: Due to mutations that change the structure of the target protein, the substance cannot reach the designated binding mode it doesn't fit perfectly into the pocket anymore.

The data provides an important basis for improving antimalarial drugs. Scientists could now modify the molecular structure of atovaquone by means of structure-based drug design, ensuring that the active substance forms necessary bonds and that the pathogen is no longer resistant to it.


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Contact: Dr. Carola Hunte
carola.hunte@biochemie.uni-freiburg.de
49-761-203-5279
University of Freiburg
Source:Eurekalert  

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