Computational thermostabilization of an enzyme

TitleComputational thermostabilization of an enzyme
Publication TypeJournal Article
Year of Publication2005
AuthorsKorkegian, A., Black M. E., Baker D., & Stoddard B. L.
JournalScience
Volume308
Issue5723
Pagination857-60
Date Published2005 May 6
ISSN1095-9203
KeywordsAmino Acid Sequence, Binding Sites, Catalysis, Circular Dichroism, Collaborative Publication, Computer Simulation, Crystallography, X-Ray, Cytosine Deaminase, Enzyme Stability, Escherichia coli, Kinetics, Models, Molecular, Molecular Sequence Data, Monte Carlo Method, Mutagenesis, Site-Directed, Point Mutation, Protein Conformation, Protein Denaturation, Protein Engineering, Protein Folding, Protein Structure, Secondary, Software, Temperature, Thermodynamics, Transformation, Genetic, Yeasts
Abstract

Thermostabilizing an enzyme while maintaining its activity for industrial or biomedical applications can be difficult with traditional selection methods. We describe a rapid computational approach that identified three mutations within a model enzyme that produced a 10 degrees C increase in apparent melting temperature T(m) and a 30-fold increase in half-life at 50 degrees C, with no reduction in catalytic efficiency. The effects of the mutations were synergistic, giving an increase in excess of the sum of their individual effects. The redesigned enzyme induced an increased, temperature-dependent bacterial growth rate under conditions that required its activity, thereby coupling molecular and metabolic engineering.

Alternate JournalScience
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