Encoding Noncanonical Amino Acids into Phage Displayed Proteins

Area of Science:

• Biotechnology
• Protein Engineering
• Synthetic Biology

Background:

• Phage display is a powerful technique for evolving proteins but is limited by naturally encoded amino acids.
• Genetic code expansion offers a method to incorporate noncanonical amino acids (ncAAs) into proteins.

Purpose of the Study:

• To describe a method for incorporating one or two ncAAs into single-chain fragment variable (scFv) antibodies using phage display.
• To expand the chemical diversity of phage-displayed proteins.

Main Methods:

• Utilized amber or quadruplet codons to direct the incorporation of ncAAs.
• Employed a pyrrolysyl-tRNA synthetase/tRNA pair for lysine derivative incorporation.
• Employed an orthogonal tyrosyl-tRNA synthetase/tRNA pair for phenylalanine derivative incorporation.

Main Results:

• Successfully incorporated one or two ncAAs into scFv antibodies displayed on phage.
• Demonstrated the feasibility of expanding the chemical repertoire of phage-displayed proteins.

Conclusions:

• The described method enables the creation of phage-displayed proteins with novel chemical functionalities.
• This approach lays the groundwork for advanced applications in imaging, targeted delivery, and novel material development.