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

This news release is available in German.

A research team led by Prof. Dr. Carola Hunte of the University of Freiburg/ Germany has succeeded in describing how the antimalarial drug atovaquone binds to its target protein. The scientists used x-ray crystallography to determine the three-dimensional structure of the protein with the active substance bound. The drug combination atovaquone-proguanil (Malarone) is a medication used worldwide for the prevention and treatment of malaria. The data and the resulting findings concerning the mode of action of atovaquone could lead to improved medications against the tropical disease. Hunte and her team conducted the research at the Institute for Biochemistry and Molecular Biology of the Faculty of Medicine and the Centre for Biological Signalling Studies BIOSS at the University of Freiburg. The scientists published their findings in the journal Nature Communications.

Malaria is one of the most dangerous tropical diseases in the world. Anopheles mosquitoes infected with Plasmodium species unicellular parasites transmit the disease by biting. Atovaquone blocks a protein of the respiratory chain in the mitochondria, the power plants of the cell, thus killing off the parasites. However, the pathogen is susceptible to mutations so that drug resistant strains are arising and spreading. The Freiburg scientists have now paved the way for the development of improved drugs by revealing the precise binding mode of atovaquone to the target protein. They used the mitochondrial protein from cells of baker's yeast for their analyses due to its close resemblance to the parasitic protein.

The target protein of atovaquone is the third of four enzymes of the respiratory chain in the mitochondrion. The amino acid chains of the prote
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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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