Site-saturation mutagenesis by overlap extension PCR

Area of Science:

• Molecular Biology
• Protein Engineering

Background:

• Site-saturation mutagenesis is a key method for creating variant gene libraries.
• It introduces specific amino acid substitutions by incorporating degenerate bases at codon locations.

Purpose of the Study:

• To describe a simple and efficient overlap PCR protocol.
• To enable the introduction of degenerate bases at single or multiple codon sites.

Main Methods:

• Overlap PCR protocol for introducing degenerate bases.
• Generation of variant gene libraries with defined sizes.

Main Results:

• The protocol allows for precise amino acid substitutions.
• Libraries can be directly screened for improved protein function.

Conclusions:

• This method facilitates directed evolution studies.
• It complements random mutagenesis strategies by accessing a wider range of amino acid substitutions.