Random DNA fragmentation with endonuclease V: application to DNA shuffling

Area of Science:

• Molecular Biology
• Biotechnology
• Enzymology

Background:

• DNA shuffling is a powerful technique for protein engineering and molecular evolution.
• Conventional DNA shuffling methods often involve complex protocols with DNase I, requiring partial digestion and gel separation.
• These conventional methods can be labor-intensive and may suffer from reproducibility issues.

Purpose of the Study:

• To develop a revised and simplified DNA shuffling protocol.
• To explore the utility of endonuclease V for random DNA fragmentation in gene recombination.
• To reduce labor and enhance reproducibility in DNA shuffling.

Main Methods:

• Application of endonuclease V for random fragmentation of DNA containing uracil.
• Adjustment of DNA fragment length by controlling dUTP concentration in polymerase chain reaction (PCR).
• Recombination of truncated green fluorescent protein (GFP) genes using the endonuclease V-based method.

Main Results:

• Endonuclease V efficiently nicked uracil-containing DNA at specific sites, enabling random fragmentation.
• Fragment length was controllable by varying dUTP concentration during PCR.
• Successful recombination of GFP genes was achieved, evidenced by the expression of full-length fluorescent GFP.

Conclusions:

• Endonuclease V provides a streamlined and reproducible alternative to DNase I for DNA fragmentation in DNA shuffling.
• The revised protocol significantly reduces labor and eliminates the need for gel separation.
• This method facilitates efficient gene recombination and holds promise for protein engineering applications.