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Engineering a Metathesis-Catalyzing Artificial Metalloenzyme Based on HaloTag.

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Artificial metalloenzymes (ArMs) were created using the HaloTag protein scaffold for metathesis reactions. This novel approach demonstrates high catalytic efficiency and evolvability for synthetic chemistry applications.

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Area of Science:

  • Biocatalysis
  • Protein Engineering
  • Synthetic Chemistry

Background:

  • Artificial metalloenzymes (ArMs) combine enzyme active sites with synthetic catalysts.
  • Protein scaffold selection is crucial for ArM activity and tuning.
  • HaloTag is a versatile self-labeling protein in chemical biology.

Purpose of the Study:

  • To repurpose the HaloTag protein as a scaffold for artificial metalloenzymes.
  • To develop ArMs for catalyzing metathesis reactions.
  • To investigate the evolvability and substrate scope of HaloTag-based ArMs.

Main Methods:

  • Covalent attachment of metathesis cofactors to the HaloTag scaffold.
  • Utilizing both chemical and genetic engineering for ArM development.
  • Assessing catalytic performance through turnover numbers and conversion rates.

Main Results:

  • Successfully created ArMs using the HaloTag scaffold for ring-closing metathesis.
  • Demonstrated the evolvability of HaloTag-based ArMs through engineering.
  • Achieved high turnover numbers (>48) and conversion rates (>96%) for specific substrates.

Conclusions:

  • HaloTag is a viable and effective protein scaffold for artificial metalloenzyme development.
  • Repurposed HaloTag ArMs exhibit significant potential for metathesis catalysis.
  • This work expands the utility of HaloTag in biocatalysis and synthetic chemistry.