Improvement of enterocin P purification process.

Area of Science:

• Microbiology
• Molecular Biology
• Biotechnology

Background:

• Enterocin P (EntP) is a sec-dependent bacteriocin produced by Enterococcus faecium.
• Bacteriocins, like EntP, are antimicrobial peptides with potential therapeutic applications.
• Efficient heterologous production of bacteriocins is crucial for their large-scale application.

Purpose of the Study:

• To describe the purification and heterologous expression of enterocin P (EntP) in Escherichia coli.
• To develop a method for producing recombinant EntP (EntRP) for potential therapeutic use.
• To evaluate the suitability of E. coli and the pET-32b vector system for class IIa bacteriocin production.

Main Methods:

• PCR amplification of the enterocin P structural gene (entP).
• Cloning of the amplified gene into the pET-32b expression vector under the T7lac promoter.
• Genetic modification to create recombinant EntRP with added amino acids.
• Recovery of active EntRP from the soluble cytoplasmic fraction of E. coli.
• Characterization using ELISA and Western-blot analysis.
• Purification via immunoaffinity chromatography.

Main Results:

• Successful genetic modification and expression of recombinant EntRP in E. coli.
• Active EntRP was recovered from the soluble fraction of the host cells.
• Characterization confirmed the presence and identity of EntRP.
• Immunoaffinity chromatography yielded purified EntRP.
• The E. coli/pET-32b system proved effective for EntP production.

Conclusions:

• Escherichia coli serves as a viable and effective heterologous host for enterocin P production.
• The pET-32b expression vector system is suitable for the heterologous production of class IIa bacteriocins.
• This study provides a foundation for the scalable production of EntP and potentially other bacteriocins.