Review of Xylanases: Sources, Engineering and Biotechnological Use.

Area of Science:

• Enzymology
• Biotechnology
• Industrial Microbiology

Background:

• Xylanases (EC 3.2.1.8) are vital enzymes for biomass deconstruction, with broad applications in pulp and paper, food, feed, and biofuel industries.
• Understanding xylan substrate diversity, enzyme classification, and catalytic mechanisms is key to their effective utilization.

Purpose of the Study:

• To provide a comprehensive review of the current state and future prospects of xylanase research and application.
• To analyze challenges in xylanase purification and explore recombinant production systems.
• To highlight protein engineering strategies for enhancing enzyme properties.

Main Methods:

• Review of scientific literature on xylanase structure, function, and application.
• Analysis of xylanase classification, catalytic mechanisms, and functional studies.
• Assessment of purification techniques and recombinant production systems (e.g., E. coli, B. subtilis, K. phaffii).
• Evaluation of protein engineering approaches for enzyme property enhancement.

Main Results:

• Xylanases exhibit structural diversity corresponding to various xylan substrates.
• Natural microbial sources have limitations for industrial-scale production.
• Recombinant systems like E. coli, B. subtilis, and K. phaffii offer advantages for high-yield xylanase production.
• Protein engineering significantly enhances xylanase thermostability, specific activity, and pH tolerance.

Conclusions:

• Xylanases play a critical role in industrial biotechnology.
• Optimization through protein engineering is essential for advancing xylanase applications.
• Future research should focus on further enhancing enzyme properties for industrial demands.