Thermal stability and kinetic constants for 129 variants of a family 1 glycoside hydrolase reveal that enzyme activity and stability can be separately designed.

TitleThermal stability and kinetic constants for 129 variants of a family 1 glycoside hydrolase reveal that enzyme activity and stability can be separately designed.
Publication TypeJournal Article
Year of Publication2017
AuthorsCarlin DAlexander, Hapig-Ward S, Chan BWayne, Damrau N, Riley M, Caster RW, Bethards B, Siegel JB
JournalPLoS One
Volume12
Issue5
Paginatione0176255
Date Published2017
ISSN1932-6203
KeywordsAlgorithms, Catalytic Domain, Cloning, Molecular, Crystallography, X-Ray, Enzyme Stability, Escherichia coli, Genetic Variation, Glycoside Hydrolases, Kinetics, Models, Molecular, Protein Structure, Tertiary, Temperature
Abstract

Accurate modeling of enzyme activity and stability is an important goal of the protein engineering community. However, studies seeking to evaluate current progress are limited by small data sets of quantitative kinetic constants and thermal stability measurements. Here, we report quantitative measurements of soluble protein expression in E. coli, thermal stability, and Michaelis-Menten constants (kcat, KM, and kcat/KM) for 129 designed mutants of a glycoside hydrolase. Statistical analyses reveal that functional Tm is independent of kcat, KM, and kcat/KM in this system, illustrating that an individual mutation can modulate these functional parameters independently. In addition, this data set is used to evaluate computational predictions of protein stability using the established Rosetta and FoldX algorithms. Predictions for both are found to correlate only weakly with experimental measurements, suggesting improvements are needed in the underlying algorithms.

DOI10.1371/journal.pone.0176255
Alternate JournalPLoS ONE
PubMed ID28531185
PubMed Central IDPMC5439667