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Computational Design of a Biologically Active Enzyme
Mary A. Dwyer,1Loren L. Looger,1*Homme W. Hellinga1
Rational design of enzymes is a stringent test of our understandingof protein chemistry and has numerous potential applications.Here, we present and experimentally validate the computationaldesign of enzyme activity in proteins of known structure. Wehave predicted mutations that introduce triose phosphate isomeraseactivity into ribose-binding protein, a receptor that normallylacks enzyme activity. The resulting designs contain 18 to 22mutations, exhibit 105- to 106-fold rate enhancements over theuncatalyzed reaction, and are biologically active, in that theysupport the growth of Escherichia coli under gluconeogenic conditions.The inherent generality of the design method suggests that manyenzymes can be designed by this approach.
1 Department of Biochemistry, Duke University Medical Center, Durham, NC 27710, USA.
* Present address: Department of Plant Biology, Carnegie Instituteof Washington, Stanford, CA 94305, USA.
To whom correspondence should be addressed. E-mail: hwh{at}biochem.duke.edu
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