Glycosylation-on-a-Chip: A Flow-Based Microfluidic System for Cell-Free Glycoprotein Biosynthesis

Area of Science:

• Synthetic biology
• Biotechnology
• Microfluidics

Background:

• Cell-free synthetic glycobiology enables glycoprotein production but often suffers from low yields due to competing reactions in one-pot systems.
• Existing cell-based and cell-free glycosylation systems lack spatiotemporal control.
• Microfluidic platforms offer advantages like reaction compartmentalization and enzyme reuse for improved biomanufacturing.

Purpose of the Study:

• To develop an integrated microfluidic platform for cell-free glycoprotein synthesis.
• To overcome limitations of current one-pot cell-free systems by optimizing individual reaction steps.
• To demonstrate a novel glycosylation-on-a-chip prototype for research and biomanufacturing.

Main Methods:

• Integration of cell-free protein synthesis, glycosylation, and purification in separate microfluidic compartments.
• Utilizing microfluidics for reaction compartmentalization, tunable residence times, and enzyme immobilization.
• Employing an immobilized oligosaccharyltransferase for efficient protein glycosylation.

Main Results:

• Demonstrated enhanced cell-free protein synthesis within the microfluidic platform.
• Achieved efficient protein glycosylation using immobilized enzymes.
• Successfully enriched the target glycoprotein product from the cell-free lysate.

Conclusions:

• The microfluidic platform enables optimized, compartmentalized cell-free glycoprotein synthesis.
• This glycosylation-on-a-chip system offers spatiotemporal control, overcoming limitations of existing methods.
• The prototype serves as a valuable tool for studying glycosylation and for decentralized biomanufacturing of glycoproteins.