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Evolutionary Specialization of a Promiscuous Designer Enzyme.

Reuben B Leveson-Gower1, Laura Tiessler-Sala2, Henriette J Rozeboom3

  • 1Stratingh Institute for Chemistry, University of Groningen, 9747AG Groningen, The Netherlands.

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|February 13, 2025
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Summary
This summary is machine-generated.

Enzyme evolution for specific tasks can reduce overall catalytic ability. Directed evolution of a designer enzyme with para-aminophenylalanine (pAF) yielded specialized variants, revealing molecular mechanisms of this trade-off.

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Area of Science:

  • Biochemistry and Molecular Biology
  • Enzyme Engineering and Directed Evolution
  • Structural Biology and Computational Chemistry

Background:

  • Enzyme promiscuity allows multiple catalytic activities but can lead to specialization during evolution.
  • Directed evolution of enzymes, while enhancing specific functions, may diminish their broader catalytic repertoire.
  • A previously engineered designer enzyme utilizing para-aminophenylalanine (pAF) as a catalytic residue was subjected to directed evolution.

Purpose of the Study:

  • To elucidate the molecular mechanisms underlying catalytic specialization in evolved enzyme variants.
  • To understand how directed evolution impacts enzyme selectivity and catalytic diversity.
  • To investigate the structural and functional consequences of mutations in a pAF-dependent designer enzyme.

Main Methods:

  • Performed two independent directed evolution campaigns on a promiscuous designer enzyme.
  • Employed site-directed mutagenesis to introduce specific genetic alterations.
  • Utilized X-ray crystallography for structural determination and computational analysis for mechanistic insights.

Main Results:

  • One evolved variant exhibited altered quaternary structure, enhancing enantioselective catalysis through biased substrate dynamics.
  • The second variant displayed synergistic cooperation between endogenous amino acid side chains and the pAF residue, forming a novel catalytic system.
  • Both variants demonstrated catalytic specialization, confirming the trade-off between selectivity and catalytic breadth.

Conclusions:

  • Catalytic specialization in evolved enzymes can arise from significant structural rearrangements or novel catalytic machinery.
  • Understanding these molecular bases provides insights into enzyme evolution and guides future enzyme engineering strategies.
  • The study highlights the intricate interplay between protein structure, noncanonical amino acids, and catalytic function.