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Deciphering the Allosterically Driven Conformational Ensemble in Tryptophan Synthase Evolution.

Miguel A Maria-Solano1, Javier Iglesias-Fernández1, Sílvia Osuna1,2

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This summary is machine-generated.

Researchers enhanced the efficiency of the standalone beta-subunit of Tryptophan synthase (TrpS) by restoring its allosteric regulation through distal mutations. This approach enables improved enzyme function for biosynthetic applications.

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Area of Science:

  • Enzymology
  • Structural Biology
  • Biocatalysis

Background:

  • Multimeric enzyme complexes, like Tryptophan synthase (TrpS), exhibit efficient catalysis through allosteric coupling but are inefficient in isolation.
  • TrpS, an αββα complex, synthesizes L-tryptophan, with its catalytic activity dependent on inter-subunit allosteric regulation.

Purpose of the Study:

  • To investigate the allosteric regulation of TrpS from *Pyrococcus furiosus* (PfTrpS).
  • To understand how laboratory-evolved standalone beta-subunit variants recover the allosteric conformational ensemble for enhanced catalytic efficiency.

Main Methods:

  • Computational analysis of the PfTrpS conformational ensemble.
  • Laboratory evolution of standalone beta-subunit variants.
  • Characterization of mutations affecting conformational states and catalytic efficiency.

Main Results:

  • Recovering the conformational ensemble of a TrpS subdomain is crucial for enhancing standalone beta-subunit activity.
  • Distal mutations were identified that restore allosteric regulation and alter conformational dynamics.
  • These mutations enhance the populations and exchange rates between essential conformational states.

Conclusions:

  • A rational approach was developed for evolving allosteric enzymes toward improved standalone function.
  • This strategy is applicable for designing enzymes for biosynthetic applications.
  • Understanding and manipulating enzyme conformational ensembles is key to protein engineering.