Projects 14188-14190,14300-14302,14311,16924-16925,16927

Cause: unspecified

Halorubrum lacusprofundi is a microorganism found in the extremely cold and hypersaline Deep Lake, Antarctica. This microorganism has a polyextremophilic β-galactosidase that works to break down carbohydrates. Recent work from the DasSarma group identified six key amino acid residues in β-galactosidase which, when mutated with amino acids conserved in homologs from mesophilic haloarchaea, induced significant changes to the catalytic efficiency of the enzyme and its temperature dependence (1). 

We are running molecular simulations of β-galactosidase and its mutated variants to explore how these subtle sequence changes affect the behavior of this enzyme at various temperatures. We will analyze the trajectory data to formulate explanations for the mechanisms that cause differences in catalytic efficiencies. 

In the future, a better understanding of how evolved mutations help optimize enzyme efficiency may lead to improved methods for computational enzyme design.

 

References

  1. Laye, V. J., Karan, R., Kim, J.-M., Pecher, W. T., DasSarma, P., & DasSarma, S. (2017). Key amino acid residues conferring enhanced enzyme activity at cold temperatures in an Antarctic polyextremophilic β-galactosidase. Proceedings of the National Academy of Sciences of the United States of America, 114(47), 12530–12535. http://doi.org/10.1073/pnas.1711542114

 


List of Contributors

This project is managed by Prof. Vincent Voelz at Temple University.

Dr. Voelz's research focuses on using new simulation methods to unravel the mysteries of how proteins self-assemble into their functional folds, and to design folding and binding properties of proteins and peptide mimetics from first principles. The Voelz Lab participates in the Folding@home project, hosting two servers at Temple University. Dr. Voelz was formerly a postdoctoral scholar in the Vijay Pande lab at Stanford University.

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