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Compound has potential for new class of AIDS drugs
Date:5/14/2008

ANN ARBOR, Mich.---Researchers have developed what they believe is the first new mechanism in nearly 20 years for inhibiting a common target used to treat all HIV patients, which could eventually lead to a new class of AIDS drugs.

Researchers at the University of Michigan used computer models to develop the inhibiting compound, and then confirmed in the lab that the compound does indeed inhibit HIV protease, which is an established target for AIDS treatment. The protease is necessary to replicate the virus, says Heather Carlson, U-M professor of medicinal chemistry in the College of Pharmacy, and principal investigator of the study.

Carlson stresses this is a preliminary step, but still significant.

"It's very easy to make an inhibitor, (but) it's very hard to make a drug," said Carlson, who also has an appointment in chemistry. "This compound is too weak to work in the human body. The key is to find more compounds that will work by the same mechanism."

What's so exciting is how differently that mechanism works from the current drugs used to keep the HIV from maturing and replicating, she says. Current drugs called protease inhibitors work by debilitating the HIV-1 protease. This does the same, but in a different way, Carlson says.

A protease is an enzyme that clips apart proteins, and in the case of HIV drugs, when the HIV-1 protease is inhibited it cannot process the proteins required to assemble an active virus. In existing treatments, a larger molecule binds to the center of the protease, freezing it closed.

The new mechanism targets a different area of the HIV-1 protease, called the flap recognition pocket, and actually holds the protease open. Scientists knew the flaps opened and closed, but didn't know how to target that as a mechanism, Carlson says.

Carlson's group discovered that this flap, when held open by a very small molecule---half the size of the ones used in current drug treatmen
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Contact: Laura Bailey
baileylm@umich.edu
734-647-1848
University of Michigan
Source:Eurekalert

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