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Photonic crystal biosensors detect protein-DNA interactions
Date:9/23/2008

thought to be responsible for the maintenance of resistance-encoding plasmids in certain infectious bacteria. The second was the human apoptosis-inducing factor (AIF), a protein that binds to chromosomal DNA in a DNA-sequence-independent manner.

The photonic crystal biosensor technology was further utilized in a screen for inhibitors of the AIF-DNA interaction, and through this screen aurin tricarboxylic acid was identified as the first in vitro inhibitor of AIF.

"Aurin tricarboxylic acid displayed about 80 percent inhibition of AIF-DNA binding," Hergenrother said. "Aurin tricarboxylic acid was the only compound to exhibit significant inhibition out of approximately 1,000 compounds screened."

While the photonic crystal biosensor was demonstrated only for protein-DNA interactions, analogous experiments with protein-RNA interactions, and protein-protein interactions are also possible, Cunningham said. "We also could grow cancer cells on the photonic crystal surface, and see how different drugs affect cell growth."


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Contact: James E. Kloeppel
kloeppel@uiuc.edu
217-244-1073
University of Illinois at Urbana-Champaign
Source:Eurekalert

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