[A novel bacterial cell-surface display system based on NCgl1221 from Corynebacterium glutamicum]

Area of Science:

• Biotechnology
• Molecular Biology
• Microbial Engineering

Background:

• Bacterial display systems are valuable tools in biotechnology.
• Optimizing these systems enhances their applications in biocatalysis and biosorption.

Purpose of the Study:

• To engineer a novel Escherichia coli cell surface display system.
• To utilize a C-terminally truncated NCgl1221 protein as an anchor for surface display.

Main Methods:

• Constructed a fusion expression vector with truncated NCgl1221 and beta-amylase.
• Expressed and induced the fusion protein in Rosetta (DE3) pLysS E. coli.
• Verified beta-amylase display using fluorescence microscopy and flow cytometry.
• Assessed beta-amylase activity through starch hydrolysis assays.

Main Results:

• Successfully expressed the fusion protein in E. coli.
• Demonstrated the display of active beta-amylase on the E. coli cell surface.
• Confirmed that the recombinant E. coli strain could utilize soluble starch.

Conclusions:

• Developed a novel E. coli surface display system using truncated NCgl1221.
• Successfully displayed an active 56 kDa beta-amylase enzyme on the bacterial surface.
• Established a foundation for applying this system as a whole-cell biocatalyst or biosorbent.