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Study offers new way to discover HIV vaccine targets
Date:3/21/2013

Decades of research and three large-scale clinical trials have so far failed to yield an effective HIV vaccine, in large part because the virus evolves so rapidly that it can evade any vaccine-induced immune response.

Researchers from the Ragon Institute of MGH, MIT and Harvard University have now developed a new approach to vaccine design that may allow them to cut off those evolutionary escape routes. The researchers have developed and experimentally validated a computational method that can analyze viral protein sequences to determine how well different viral strains can reproduce in the body. That knowledge gives researchers an unprecedented guide for identifying viral vulnerabilities that could be exploited to design successful vaccine targets.

The team, led by Arup Chakraborty, the Robert T. Haslam Professor of Chemical Engineering, Chemistry, Physics and Biological Engineering at MIT, has designed protein fragments (peptides) that would target these weaknesses. Ragon Institute researchers are now developing ways to deliver the peptides so they can be tested in animals.

"We think that, if it continues to be validated against laboratory and clinical data, this method could be quite useful for rational design of the active component of a vaccine for diverse viruses. Furthermore, if delivered properly, the peptides we have designed may be able to mount potent responses against HIV across a population," says Chakraborty, who is also the director of MIT's Institute for Medical Engineering and Science.

Chakraborty and his colleagues describe their findings in the March 21 issue of the journal Immunity. Lead author of the paper is Andrew Ferguson, a former postdoc in Chakraborty's lab who is now an assistant professor at the University of Illinois at Urbana-Champaign. Other authors are Bruce Walker, director of the Ragon Institute and a professor at Harvard Medical School; Thumbi Ndung'u of the Ragon Institute and the
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Contact: Kimberly Allen
allenkc@mit.edu
617-253-2702
Massachusetts Institute of Technology
Source:Eurekalert

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