Protein fragment swapping: a method for asymmetric, selective site-directed recombination

Area of Science:

• Protein engineering
• Computational biology
• Biochemistry

Background:

• Traditional site-directed recombination methods can be inefficient, exploring vast sequence spaces.
• Developing targeted approaches for protein engineering is crucial for creating novel functionalities.

Purpose of the Study:

• To present a new asymmetric and selective site-directed recombination method for protein engineering.
• To focus experimental efforts on specific sequence spaces for improved hybrid generation.
• To enable the swapping of functionally important regions into target scaffolds.

Main Methods:

• Developed a protein fragment swapping approach using residue position boundaries.
• Introduced an integer programming method, Swagmer, to optimize fragment selection.
• Assessed fragment swapping plans using an average potential score.

Main Results:

• Demonstrated effectiveness in selective recombination of beta-lactamases and activity swapping in glutathione transferases and purE family enzymes.
• Showed that the selective recombination approach yields better plans than traditional methods.
• Proved that optimized experiments significantly outperform stochastic methods.

Conclusions:

• The developed method efficiently generates protein hybrids with desired properties.
• Swagmer provides a practical solution for optimizing protein fragment recombination.
• This approach enhances the creation of novel protein functionalities through targeted engineering.