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Biosynthesis of Halogenated Tryptophans for Protein Engineering Using Genetic Code Expansion.

Yiming Guo1, Linqi Cheng1, Yu Hu1

  • 1Department of Chemistry, Rice University, 6100 Main Street, Houston, Texas, 77005, U.S.A.

Chembiochem : a European Journal of Chemical Biology
|July 3, 2024
PubMed
Summary

This study develops autonomous cells that biosynthesize halogenated tryptophan derivatives for protein engineering via Genetic Code Expansion. This overcomes limitations of costly external amino acid sources, enabling precise protein modulation.

Keywords:
BiosynthesisGenetic Code ExpansionHalogenaseHalogenated tryptophanNoncanonical amino acidProtein engineering

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Area of Science:

  • Biochemistry
  • Synthetic Biology
  • Molecular Biology

Background:

  • Genetic Code Expansion (GCE) enables precise noncanonical amino acid (ncAA) incorporation into proteins.
  • Current GCE methods are limited by expensive and difficult-to-synthesize ncAAs.

Purpose of the Study:

  • To develop autonomous cells for biosynthesizing halogenated tryptophan derivatives.
  • To utilize these derivatives for protein engineering via GCE, overcoming external ncAA limitations.

Main Methods:

  • Utilized inexpensive halide salts and various halogenases for selective biosynthesis of halogenated tryptophans (6-chloro, 7-chloro, 6-bromo, 7-bromo).
  • Employed bioorthogonal aminoacyl-tRNA synthetase/tRNA pairs to incorporate these derivatives at specific protein sites via amber codon suppression.
  • Optimized expression systems for robust protein production containing halogenated tryptophan residues.

Main Results:

  • Successfully achieved selective biosynthesis of four distinct halogenated tryptophan derivatives.
  • Demonstrated efficient incorporation of these derivatives into proteins at designated positions within autonomous cells.
  • Validated robust protein expression containing biosynthesized halogenated tryptophan residues.

Conclusions:

  • Established a versatile platform for engineering proteins with diverse halogenated tryptophan residues.
  • This approach significantly reduces the cost and complexity associated with GCE.
  • Paves the way for novel protein designs with modulated structures and functions.