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Related Experiment Video

Updated: Jun 3, 2026

A Protocol for Functional Assessment of Whole-Protein Saturation Mutagenesis Libraries Utilizing High-Throughput Sequencing
11:36

A Protocol for Functional Assessment of Whole-Protein Saturation Mutagenesis Libraries Utilizing High-Throughput Sequencing

Published on: July 3, 2016

Synthetic approach to stop-codon scanning mutagenesis.

Lihua Nie1, Jason J Lavinder, Mohosin Sarkar

  • 1Department of Chemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, USA.

Journal of the American Chemical Society
|April 2, 2011
PubMed
Summary

A new method enables controlled gene scanning using amber stop codons to insert various amino acids. This technique revealed unexpected protein interactions and potential tetramer formation in the Rop protein.

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Area of Science:

  • Molecular Biology
  • Synthetic Chemistry
  • Protein Engineering

Background:

  • Amber stop codons (TAG) can be suppressed to incorporate unnatural amino acids.
  • Combinatorial mutagenesis allows for systematic gene scanning and amino acid incorporation.
  • The Rop protein is a model system for studying protein-protein interactions and plasmid copy number regulation.

Purpose of the Study:

  • To develop a general combinatorial mutagenesis strategy for scanning genes with amber stop codons.
  • To utilize this strategy for incorporating natural and unnatural amino acids into the Rop protein.
  • To investigate the function of Rop protein variants and explore protein interactions using photo-crosslinking.

Main Methods:

  • Development of a synthetic strategy using phosphoramidites for controlled gene scanning.
  • In vivo activity screening of Rop protein variants with incorporated alanine.
  • Incorporation of photo-affinity label p-benzoylphenylalanine (Bpa) into Rop protein mutants.
  • UV irradiation and analysis of cross-linked Rop protein products.

Main Results:

  • A versatile DNA library was created for incorporating diverse amino acids at TAG codons.
  • Alanine incorporation into Rop revealed differences in binding site mapping compared to in vitro studies.
  • Surprisingly low activity of Phe14Bpa-Rop despite the importance of Phe14.
  • Bpa cross-linking of Phe14Bpa-Rop demonstrated formation of dimers, trimers, and tetramers, suggesting weak tetramer association.

Conclusions:

  • The developed mutagenesis strategy offers complete synthetic control for gene scanning.
  • Bpa cross-linking is effective in trapping weak and transient protein interactions, revealing potential tetramer formation in Rop.
  • This approach facilitates the study of protein function and interactions by incorporating unnatural amino acids.