β-Galactosidase: a traditional enzyme given multiple roles through protein engineering

Area of Science:

• Biochemistry
• Enzymology
• Protein Engineering

Background:

• β-Galactosidases are key enzymes in carbohydrate metabolism, crucial for lactose hydrolysis and galactooligosaccharide synthesis.
• Current applications in dairy processing benefit lactose-intolerant individuals but are limited by enzyme properties.
• Intrinsic limitations include low transglycosylation efficiency, product inhibition, poor thermal stability, and narrow substrate specificity.

Purpose of the Study:

• To review the structure-function relationships and catalytic mechanisms of β-galactosidases.
• To summarize the properties and applications of these enzymes.
• To highlight recent advancements in enzyme engineering strategies for β-galactosidases.

Main Methods:

• Analysis of structural features of β-galactosidases from various glycosyl hydrolase families.
• Detailed summary of catalytic mechanisms.
• Review of existing literature on enzyme engineering approaches and their outcomes.

Main Results:

• Understanding enzyme structure provides insights into catalytic mechanisms and guides protein engineering efforts.
• Enzyme engineering strategies have shown promise in improving catalytic efficiency and stability.
• Combined structural and mechanistic knowledge is essential for targeted enzyme optimization.

Conclusions:

• Structural and mechanistic insights are critical for advancing β-galactosidase engineering.
• Optimized β-galactosidases hold significant potential for enhanced applications in the food and dairy sectors.
• Further research in enzyme engineering will drive innovation and broader industrial utilization.