A fusion protein expression analysis using surface plasmon resonance imaging.

Area of Science:

• Biotechnology
• Molecular Biology
• Analytical Chemistry

Background:

• Traditional methods for analyzing recombinant protein expression, such as SDS-PAGE and Western blots, are time-consuming and laborious.
• There is a need for faster, high-throughput methods to assess the expression of affinity-tagged proteins.

Purpose of the Study:

• To construct and evaluate a surface plasmon resonance (SPR) imaging system for detecting affinity-tagged recombinant proteins.
• To demonstrate the system's capability for rapid, high-throughput protein expression analysis.

Main Methods:

• Construction of a surface plasmon resonance (SPR) imaging system.
• Analysis of affinity-tagged proteins (His(6)-Ub-hGH, GST-hIL6, MBP-hIL6) expressed in Escherichia coli.
• Immobilization of affinity ligands (IDA-Ni(II), glutathione, cyclodextrin) on SPR-functionalized gold thin films.
• Detection of bound proteins using SPR imaging after sample application and washing.

Main Results:

• Successful detection of His(6)-Ub-hGH, GST-hIL6, and MBP-hIL6 expressed in E. coli using the SPR imaging system.
• Demonstration of rapid, high-throughput expression analysis of affinity-tagged proteins.
• The SPR imaging protein chip system provides a viable alternative to conventional methods.

Conclusions:

• The developed SPR imaging system is effective for high-throughput analysis of affinity-tagged protein expression.
• This SPR imaging approach offers a significant improvement over traditional, laborious methods like SDS-PAGE and Western blots.
• The system is expected to be a valuable tool in biotechnology and molecular biology research.