Iss from a virulent avian Escherichia coli.

Area of Science:

• Microbiology
• Veterinary Science
• Molecular Biology

Background:

• Virulent avian Escherichia coli strains cause significant economic losses in poultry farming.
• Current diagnostic methods for colibacillosis lack a specific target for virulent strains.
• The iss gene has shown a strong association with the disease-causing ability of avian E. coli isolates.

Purpose of the Study:

• To express, purify, and characterize the avian E. coli Iss protein.
• To establish a foundation for developing novel diagnostic reagents for avian colibacillosis.
• To investigate the potential of Iss protein as a biomarker for virulent E. coli.

Main Methods:

• Cloning of the iss gene into an expression vector.
• Transformation into protease-deficient E. coli and induction of protein expression.
• Purification of the Iss protein as a glutathione-S-transferase (GST) fusion using affinity chromatography.
• Cleavage of the GST tag and further purification of Iss protein.
• Confirmation of Iss protein identity via N-terminal sequencing.

Main Results:

• Successful expression and purification of avian E. coli Iss protein.
• Characterization of the purified Iss protein.
• Confirmation of the protein's identity through N-terminal sequencing.
• The purified Iss protein is available for antibody production.

Conclusions:

• The avian E. coli Iss protein can be successfully expressed and purified.
• Purified Iss protein is a viable candidate for generating monoclonal antibodies.
• Anti-Iss antibodies hold promise as diagnostic reagents for detecting virulent avian E. coli and managing colibacillosis.