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Related Experiment Videos

Local encoding of computationally designed enzyme activity.

Malin Allert1, Mary A Dwyer, Homme W Hellinga

  • 1Department of Biochemistry, Duke University Medical Center, Durham, NC 27710, USA.

Journal of Molecular Biology
|January 2, 2007
PubMed
Summary

Computational protein design successfully transplanted enzyme activity into a new protein. The designed mutations were sufficient to encode catalytic function locally, achieving significant transition state stabilization.

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Area of Science:

  • Biochemistry
  • Protein Engineering
  • Computational Biology

Background:

  • Computational protein design aims to create novel enzyme activities by identifying mutations that stabilize transition states.
  • Previous work demonstrated introducing triose phosphate isomerase activity into Escherichia coli ribose-binding protein via 17 mutations.

Purpose of the Study:

  • To investigate the transplantability of computationally designed mutations into a homologous protein from a different organism.
  • To assess the retention of catalytic activity, substrate affinity, and pH dependence after transplantation.
  • To determine the extent of transition state stabilization achieved by these mutations.

Main Methods:

  • Transplantation of 17 specific mutations into a homologous ribose-binding protein from Thermoanaerobacter tengcongensis.

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  • Characterization of the transplanted protein's catalytic activity, substrate affinity, and reaction pH profile.
  • Analysis of sequence conservation in homologous proteins around the ligand-binding sites.

    • Main Results:

    • The transplanted mutations retained catalytic activity, substrate affinity, and pH dependence in the new host protein.
    • A 10^5-10^6 fold rate enhancement was observed, indicating significant transition state stabilization (70% of maximal).
    • Sequence analysis revealed high conservation near the binding site but divergence further away, supporting local encoding of activity.

    Conclusions:

    • Computationally designed mutations are sufficient to confer novel enzyme activity and encode it locally.
    • The study demonstrates successful transplantation of designed enzyme function into a homologous protein from a hyperthermophilic bacterium.
    • Significant transition state stabilization can be achieved through stereochemical complementarity, with potential for high efficiency.