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Pnictogen-Bonding Enzymes.

Giacomo Renno1,2, Dongping Chen2,3, Qing-Xia Zhang1,2

  • 1Department of Organic Chemistry, University of Geneva, Geneva, Switzerland.

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Summary
This summary is machine-generated.

Researchers developed novel artificial enzymes using pnictogen bonding for efficient catalysis. These stibine-based catalysts demonstrate strong transition-state recognition, paving the way for advanced biocatalysis applications.

Keywords:
Artificial enzymescatalysispnictogen bondstransfer hydrogenation

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Area of Science:

  • Bioinorganic Chemistry
  • Catalysis
  • Supramolecular Chemistry

Background:

  • Pnictogen bonding, a non-covalent interaction involving σ-hole interactions, is largely unexplored in biocatalysis.
  • Artificial enzymes offer a platform to introduce novel catalytic mechanisms absent in natural systems.

Purpose of the Study:

  • To design and synthesize artificial enzymes utilizing pnictogen bonding for catalytic applications.
  • To investigate the efficiency of stibine-based catalysts in transfer hydrogenation reactions.
  • To explore the role of σ-hole interactions in catalytic activity and substrate recognition.

Main Methods:

  • Synthesis of stibine catalysts functionalized with biotin derivatives.
  • Immobilization of catalysts onto engineered streptavidin mutants.
  • Assay development for transfer hydrogenation of a fluorogenic quinoline substrate.
  • Kinetic analysis using Michaelis-Menten models.

Main Results:

  • Catalytic activity significantly increased with engineered streptavidin mutants compared to wild-type.
  • Correlation observed between catalytic efficiency and the depth of the σ-hole on the antimony(V) center.
  • Emergence of saturation kinetics and transition-state recognition in the low micromolar range.
  • Identification of carboxylates as key interacting species for enhanced transition-state stabilization.

Conclusions:

  • Pnictogen bonding can be effectively harnessed in artificial enzyme design for efficient catalysis.
  • Engineered protein scaffolds can enhance the performance of pnictogen-bonding catalysts.
  • The study highlights the potential of pnictogen bonding in complex catalytic systems, including stereoselective reactions.