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Codon Harmonization of a Kir3.1-KirBac1.3 Chimera for Structural Study Optimization.

Evan van Aalst1, Maryam Yekefallah1, Anil K Mehta2

  • 1Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX 79423, USA.

Biomolecules
|March 14, 2020
PubMed
Summary

Codon harmonization significantly boosts membrane protein production for nuclear magnetic resonance (NMR) studies. This method nearly doubles the yield of functional Kir3.1 channels, enabling detailed structural and functional investigations.

Keywords:
K+ channelscodon biascodon harmonizationnuclear magnetic resonance (NMR)protein expressionprotein folding

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Area of Science:

  • Structural Biology
  • Biophysics
  • Membrane Protein Biochemistry

Background:

  • Producing functional, folded, and isotopically enriched membrane proteins for nuclear magnetic resonance (NMR) studies is challenging due to low yields.
  • Traditional methods for optimizing recombinant protein expression often fall short for complex eukaryotic membrane proteins.
  • Codon harmonization, aligning recombinant gene codon usage with native patterns, has emerged as a promising strategy to enhance protein production.

Purpose of the Study:

  • To apply codon harmonization for improved expression of the inward rectifier K+ Channel (Kir) 3.1-KirBac1.3 chimera.
  • To assess the impact of codon harmonization on protein yield for NMR studies.
  • To validate the functionality and folded state of the expressed membrane protein.

Main Methods:

  • Codon harmonization technique applied to the Kir3.1-KirBac1.3 chimera construct.
  • Comparison of protein yield between harmonized and traditional codon-optimized constructs.
  • Functional assessment using a fluorescence-based assay.
  • Structural integrity confirmation via solid-state NMR correlation spectroscopy.

Main Results:

  • Codon harmonization resulted in nearly a two-fold increase in protein yield compared to traditional codon optimization.
  • The expressed Kir3.1-KirBac1.3 chimera protein was confirmed to be folded.
  • Functional assays demonstrated that the protein product is biologically active.

Conclusions:

  • Codon harmonization is an effective strategy for significantly enhancing the yield of difficult-to-express membrane proteins like Kir3.1.
  • This improved production facilitates structural and functional studies of G protein-coupled inward rectifier K+ (GIRK) channels using NMR.
  • The methodology provides a valuable tool for advancing membrane protein research and structural biology.