[Plasmid expression vectors with elements of the E. coli alkaline phosphatase gene]

Area of Science:

• Molecular Biology
• Protein Expression
• Biotechnology

Background:

• Efficient production of heterologous proteins is crucial for various applications.
• Bacterial alkaline phosphatase (phoA) is a well-characterized enzyme with a signal peptide for periplasmic export.

Purpose of the Study:

• To construct and characterize novel plasmid expression vectors.
• To achieve thermoinducible superproduction of fusion proteins using E. coli alkaline phosphatase.
• To facilitate the export of fusion proteins to the bacterial periplasm.

Main Methods:

• Construction of a family of plasmid expression vectors containing E. coli alkaline phosphatase (phoA) gene fragments.
• Utilizing the lambda PR promoter for thermoinducible expression.
• Fusing heterologous polypeptides to the N- or C-terminus of alkaline phosphatase and its leader peptide.

Main Results:

• Successful construction of functional plasmid expression vectors.
• Demonstrated thermoinducible superproduction of fusion proteins.
• Effective expression and export of fusion proteins to the periplasm.
• Fusion proteins retained enzymatic activity of alkaline phosphatase.

Conclusions:

• The developed vectors are effective tools for high-level expression and periplasmic export of fusion proteins.
• This system allows for the production of functional fusion proteins in E. coli.
• The system holds potential for applications in protein engineering and biotechnology.