Enhancing Yeast Surface Display: UPR, ERAD, and ER Dynamics in Recombinant Protein Production

Area of Science:

• Biotechnology
• Molecular Biology
• Biochemistry

Background:

• Surface display of recombinant proteins on microorganisms, especially yeast, has gained traction over two decades.
• This technique integrates biosynthesis, secretion, and cell surface immobilization, offering advantages over chemical methods.

Purpose of the Study:

• To provide an overview of the intracellular processing of recombinant proteins for cell surface display.
• To identify critical bottlenecks in the endoplasmic reticulum (ER) that limit display efficiency.

Main Methods:

• Review of cellular secretory pathways: ER synthesis, Golgi transport, and vesicle-mediated delivery.
• Analysis of ER stress responses, including the unfolded protein response (UPR) and ER-associated degradation (ERAD).

Main Results:

• Recombinant protein transport to the cell surface mirrors native secretory pathways.
• Overloading the ER can trigger UPR and ERAD, significantly reducing protein display efficiency.
• Current systems show improvements for specific proteins, but a universal solution remains elusive.

Conclusions:

• The endoplasmic reticulum processing pathway is a critical bottleneck for efficient recombinant protein surface display.
• Optimized systems tailored to specific protein characteristics are likely necessary for broad industrial application.
• Further research into ER-specific optimization strategies is crucial for advancing this technology.