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Researchers unlock the protein puzzle
Date:7/23/2014

By using brightly hued dyes, George Mason University researchers discovered an innovative way to reveal where proteins touch each other, possibly leading to new treatments for cancer, arthritis, heart disease and even lung disease.

George Mason researchers unraveled the mystery of deciphering the contact points where proteins touch each other. "One protein interlocks with another protein like adjacent pieces in a jigsaw puzzle, and this sends a signal down the line to the next protein," says Lance Liotta, co-director of the Mason-based Center for Applied Proteomics and Molecular Medicine.

The mystery is in the "hot spots" where proteins interlock. Researchers know which proteins connect but couldn't pinpoint where it happens. Until now, thanks to Mason's newly published approach.

Dyesthe type used in common copying machines and textilesare mixed with proteins. The dye paints the proteins everywhere except where the proteins are connected to one another. Then the proteins are disconnected but the dye remains, excluding the blank spot where the proteins were "kissing."

Finding ways to break up interlocking proteins could be used to locate new drug targets, says Virginia "Ginny" Espina, a professor with the center. Pharmaceutical companies could use the Mason-developed process to create drugs that break up the protein-to-protein connection or stop it from happening altogether, she says.

The team tackled a complex interaction of three proteins, called interleukin signaling, that leads to painful inflammatory arthritis and other diseases including inflammatory bowel disease. They created two inhibitorsa peptide and an antibodythat broke up the protein connection in a test tube. "Both inhibitors made these proteins fall apart and they couldn't send out a signal for inflammation," Liotta says.

Until the Mason-led advancement, researchers have struggled to figure out where proteins make contact. "It seems very easy
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Contact: Michele McDonald
mmcdon15@gmu.edu
703-993-8781
George Mason University
Source:Eurekalert

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