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Related Experiment Videos

The consensus concept for thermostability engineering of proteins.

M Lehmann1, L Pasamontes, S F Lassen

  • 1F. Hoffmann-La Roche Ltd., Vitamins and Fine Chemicals Division, Building 2411865, Basel, Switzerland.

Biochimica Et Biophysica Acta
|January 11, 2001
PubMed
Summary

The consensus approach rapidly designs thermostable enzymes from mesophilic enzyme sequences. This method enhances enzyme stability without compromising catalytic activity, offering a novel alternative for protein engineering.

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Area of Science:

  • Biochemistry
  • Protein Engineering
  • Enzyme Kinetics

Background:

  • Thermostable enzymes are valuable for industrial applications.
  • Predicting thermostabilizing mutations using sequence comparisons has shown promise.
  • Existing rational design methods for thermostability can be complex.

Purpose of the Study:

  • To introduce and validate a 'consensus approach' for designing thermostable enzymes.
  • To demonstrate that homologous mesophilic enzyme sequences contain sufficient information for this design.
  • To engineer a highly thermostable fungal phytase variant.

Main Methods:

  • Sequence alignment of homologous fungal phytases to derive a consensus sequence.
  • Synthetic gene construction, recombinant expression, and protein purification.

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  • Site-directed mutagenesis for further optimization of consensus phytases.

    • Main Results:

    • The first consensus phytase (consensus phytase-1) exhibited a 15–22°C higher melting temperature (T(m)) than parent enzymes.
    • Optimized consensus phytases achieved T(m) values up to 90.4°C.
    • Increased thermostability resulted from multiple, distributed amino acid substitutions, primarily affecting surface residues.
    • Catalytic activity at 37°C remained unaffected.

    Conclusions:

    • The consensus approach is a powerful and novel method for enzyme thermostability engineering.
    • This strategy offers an effective alternative to directed evolution and other rational design methods.
    • Consensus protein design can yield highly stable and functional enzymes.