One-step enzyme extraction and immobilization for biocatalysis applications

Area of Science:

• Biocatalysis
• Protein Immobilization
• Enzyme Engineering

Background:

• Enzyme immobilization is crucial for industrial biocatalysis, enhancing stability and reusability.
• His(6)-tagged proteins are common in biotechnology, but efficient immobilization methods are needed.
• Current methods can be complex or lead to significant activity loss.

Purpose of the Study:

• To develop a facile and efficient method for extracting and immobilizing His(6)-tagged enzymes.
• To evaluate the HisSi Immobilization method's effectiveness across multiple enzyme classes.
• To demonstrate the utility of immobilized enzymes in synthesis and hydrolysis reactions.

Main Methods:

• Modification of silica oxide beads to chelate metal ions (Co(II)).
• Adsorption of His(6)-tagged enzymes onto metal-ion-loaded beads for immobilization.
• Extraction of Candida antarctica lipase B (CalB) from periplasmic preparations.
• Activity assays and application testing of immobilized enzymes in organic solvents and aqueous buffers.

Main Results:

• Achieved a minimum 58% activity yield for immobilized CalB in a one-step extraction-immobilization process.
• Demonstrated successful immobilization and retained activity for five different enzymes, including lipases and esterases.
• Immobilized enzymes showed significant activity in organic solvents for transacylation and ester hydrolysis, unlike their free counterparts.

Conclusions:

• The HisSi Immobilization method provides a versatile and efficient approach for enzyme immobilization using the common His(6)-tag.
• This technique facilitates enzyme recovery and reuse, particularly in non-aqueous environments.
• The protocol is applicable to a broad range of enzymes, supporting diverse biocatalytic applications.