Chitin- and Streptavidin-Mediated Affinity Purification Systems: A Screening Platform for Enzyme Discovery

Area of Science:

• Biotechnology
• Biochemistry
• Organic Chemistry

Background:

• Affinity purification of recombinant proteins is crucial but often cost-prohibitive.
• High costs limit the widespread application of protein purification techniques.
• Developing cost-effective purification methods is essential for advancing biotechnology.

Purpose of the Study:

• To develop a novel, low-cost affinity purification system for Strep-tag II fusion proteins.
• To demonstrate the utility of the CSAP system in high-throughput protein screening.
• To identify novel hemoproteins for catalytic applications.

Main Methods:

• Development of the chitin- and streptavidin-mediated affinity purification (CSAP) system.
• Utilizing commercially available chitin powder as a chromatography matrix.
• Application of the CSAP system in a 96-well format for protein screening.

Main Results:

• The CSAP system significantly reduces the cost of protein affinity purification.
• Successful application of CSAP for screening 96 different hemoproteins.
• Identification of several hemoproteins with potential for catalytic diastereoselective cyclopropane synthesis.

Conclusions:

• The CSAP system provides a cost-effective alternative for recombinant protein purification.
• This method facilitates efficient protein screening for discovering new biocatalysts.
• The identified hemoproteins show promise for abiotic carbene transfer reactions.