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Directed evolution of new and improved enzyme functions using an evolutionary intermediate and multidirectional

Joanne L Porter1, Priscilla L S Boon, Tracy P Murray

  • 1Research School of Chemistry, Australian National University , Canberra, Australian Capital Territory 2601, Australia.

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|November 25, 2014
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Summary

Directed evolution enhanced enzyme technology by engineering dienelactone hydrolase variants with significantly improved catalytic activity and stability for industrial applications. This method overcomes limitations of rational design, enabling broader enzyme engineering.

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Area of Science:

  • Biotechnology
  • Enzyme Engineering
  • Protein Engineering

Background:

  • Enzyme technology requires adaptable enzymes for industrial applications.
  • Directed evolution offers a powerful method for enzyme engineering, especially when structural information is limited.

Purpose of the Study:

  • To engineer dienelactone hydrolase variants with enhanced catalytic activity and specificity for non-native substrates.
  • To explore the utility of directed evolution for enzyme improvement.

Main Methods:

  • Utilized directed evolution over 14 rounds of screening on the α/β hydrolase framework of dienelactone hydrolase.
  • Employed p-nitrophenyl acetate as an evolutionary intermediate to select for improved activity on larger p-nitrophenyl esters.
  • Analyzed enzyme variants using crystal structure and substrate docking.

Main Results:

  • Generated enzyme variants with up to 3 orders of magnitude higher catalytic activity toward larger p-nitrophenyl esters compared to the native enzyme.
  • Identified variants with increased stability through a multidimensional screening approach.
  • Observed significant changes in the enzyme's active site structure correlated with mutations.

Conclusions:

  • Directed evolution is effective for engineering enzymes with tailored specificity and enhanced catalytic function.
  • The engineered dienelactone hydrolase variants demonstrate potential for industrial applications.
  • Structural analysis provides insights into the mechanisms of enzyme adaptation during evolution.