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DNA catalysts do the work of protein enzymes
Date:3/19/2013

CHAMPAIGN, Ill. Illinois chemists have used DNA to do a protein's job, creating opportunities for DNA to find work in more areas of biology, chemistry and medicine than ever before.

Led by Scott Silverman, a professor of chemistry at the University of Illinois at Urbana-Champaign, the researchers published their findings in the journal Proceedings of the National Academy of Sciences.

Ideally, researchers would like to be able to design and build new catalysts from scratch that can do exactly what they want. Many enzymes make small modifications to the building blocks of proteins, amino acids, which can create large changes in a finished protein. However, designing or even modifying protein enzymes is a very difficult task, thanks to their complexity and size.

"Protein enzymes are the workhorses of biology," Silverman said. "They do most of the catalytic activity. Our idea is to use another kind of catalyst, artificial DNA sequences, to modify the side chains on proteins, which therefore affects their biological function."

One of the most important and difficult reactions in nature is the addition or removal of a phosphate group. In the realm of proteins, the amino acids serine and tyrosine can have phosphate added to or removed from them, which can alter the protein's function or turn enzyme activity on or off. Without help from catalysts, such reactions take a very long time to occur on the order of thousands to millions of years. So nature uses enzymes called kinases or phosphatases to catalyze these reactions.

Silverman's group identified artificial DNA catalysts that can do phosphatase's job of removing phosphate from serine and tyrosine. Demonstr
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Contact: Liz Ahlberg
eahlberg@illinois.edu
217-333-5802
University of Illinois at Urbana-Champaign
Source:Eurekalert  

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