Vaccines for HIV
A New Design Strategy
February 23, 2012 - Newswise - San Diego, Calif. - HIV has eluded vaccine-makers for thirty years, in
part due to the virus' extreme ability to mutate. Physical scientists and clinical virologists from the Massachusetts Institute of
Technology (MIT) and the Ragon Institute in Cambridge, Mass., have identified a promising strategy for vaccine design using a
mathematical technique that has also been used in problems related to quantum physics, as well as in analyses of stock
market price fluctuations and studies of enzyme sequences. The team, led by Arup Chakraborty of MIT and Bruce Walker
of the Ragon Institute, will give an update on its work at the Biophysical Society 56th Annual Meeting, held Feb.
25-29 in San Diego, Calif.
Vaccines prime the immune system to target molecular signatures associated with a particular pathogen. But HIV's ability
to mutate has made it difficult to identify reliable vaccine targets. In their search for a new type of target, the team from the Ragon
Institute did not focus on individual amino acids. Instead, the researchers sought to identify independently evolving groups of amino
acids where, within each group, amino acids mutate in tandem (meaning that they rely on one another to maintain the viability of
the virus). In particular, they looked for groups of amino acids within which combinations of mutations would have a greater
chance of making the virus unviable. By staging a multi-pronged attack against these regions of HIV, the researchers
reasoned, they might be able to trap the virus between two bad choices: be destroyed by the immune system, or mutate and destroy itself.
With a mathematical tool called random matrix theory, the team searched for high-order evolutionary constraints in the
so-called Gag region of HIV. The researchers were looking for collectively co-evolving groups of amino acids with a high number of
negative correlations (meaning multiple mutations would destroy the virus) and a low number of positive correlations (meaning the
virus could survive multiple mutations). They found this combination in a region, which they call Gag sector 3, that is involved
in stabilizing the protein shell of the virus: too many mutations here, and the virus' structure would collapse.
Interestingly, when the team studied HIV-infected individuals whose bodies are naturally able to fend off the virus'
attacks - so-called "elite controllers" - they found that these individuals' immune systems preferentially targeted Gag sector 3
over other proteins.
At the moment, the study authors are working to extend their methods to HIV proteins beyond Gag. The team is also
developing elements of the active components of a vaccine that would prime the immune system to selectively target Gag sector 3
proteins. They expect to begin testing in animal models soon.
The presentation, "Analysis of collective coevolution in HIV proteins suggests strategies for rational vaccine
design," will be presented by Dr. Chakraborty's graduate student Karthik Shekhar at 12:30 p.m. on Sunday, Feb. 26, 2012, in
the San Diego Convention Center, Room 24ABC. ABSTRACT: http://tinyurl.com/6sz7kuf
This news release was prepared for the Biophysical Society (BPS) by the American Institute of Physics (AIP).
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