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P7 protein resistance mutations identified; represent drug targets for hepatitis C virus
Date:6/28/2011

British researchers have identified specific resistance mutations for two classes of p7 inhibitor, which may explain their lack of effectiveness in clinical trials combined with current standard of care. Study results support the role of p7 inhibitor combinations as potential components of future HCV-specific therapies and are available in the July issue of Hepatology, a journal published by Wiley-Blackwell on behalf of the American Association for the Study of Liver Diseases.

More than 3% of the world population is infected with HCV, which causes severe liver disease. HCV is the leading cause of liver-related mortality and most common cause for liver transplantation in the U.S. Studies have shown that the current treatment of PEGylated interferon alpha (IFN) and ribavirin (Rib) does not adequately achieve a sustained virological response in many HCV patients. This, coupled with the high cost and poor patient compliance, continues to drive demand for new virus-specific therapies.

"The HCV p7 ion channel plays a critical role in infectious virus production, representing an important new therapeutic target," said lead researcher Dr. Stephen Griffin with the Institute of Molecular Medicine at the University of Leeds in the UK. Previously, Dr. Griffin and colleagues determined that p7 acts as a proton channel within HCV infected cells, and that its function could be blocked by small molecule inhibitors, resulting in a blockade of infectious virus production.

In the present study, the team set out to expand on their prior work by predicting inhibitor binding sites using molecular modeling, which were then validated by the identification of resistance mutations. This allowed the researchers to define the mode of action for two prototype p7 inhibitor classesadamantanes (amantadine and rimantadine) and alkylated imino-sugars (IS). This confirmed not only specific, but distinct effects for these inhibitors on the p7 protein. As these
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Contact: Dawn Peters
healthnews@wiley.com
781-388-8408
Wiley-Blackwell
Source:Eurekalert

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