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New discovery could help turn antibiotic into antimalarial drug
Date:9/3/2014

Melbourne researchers are making progress towards new antimalarial drugs, after revealing how an antibiotic called emetine blocks the molecular machinery that produces the proteins required for malaria parasite survival.

Although emetine is effective against malaria it is not used as a preventive drug due to its significant side effects. However, the work of Walter and Eliza Hall Institute researchers Dr Wilson Wong, Dr Jake Baum and colleagues in showing how emetine attaches to and blocks the molecular machinery that makes the proteins required for malaria parasite survival has revealed new approaches for antimalarial drug development.

Their study, involving collaborators led by Dr Sjors Scheres from the MRC Laboratory of Molecular Biology in Cambridge, UK and the Bio21 Institute in Melbourne was published in the journal eLife.

Malaria infects hundreds of millions of people worldwide every year and causes more than 600,000 deaths. The Plasmodium malaria parasite has developed resistance to current antimalarial drugs, making them less effective and new drugs are needed urgently.

Dr Wong said the study examined the parasite cell's protein-making machinery, called the ribosome, visualising for the first time the structure of this 'protein complex' in the malaria parasite. "The ribosome is responsible for constructing all proteins inside the cell, based on the DNA 'blueprint'," he said. "Antibiotics such as emetine kill the malaria parasite by binding to its ribosome and preventing the parasite from building the proteins it needs to produce energy, grow, reproduce and evade the immune system."

Dr Wong said knowledge of emetine and related antibiotics such as pactamycin could be used as the basis for developing new antimalarial drugs.

"Our structure is an exciting discovery as it gives a clear path forward in developing new drugs to tackle this deadly disease. We have found features of the parasitic ribo
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Contact: Alan Gill
gill.a@wehi.edu.au
61-393-452-719
Walter and Eliza Hall Institute
Source:Eurekalert  

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