title: High Yield Overexpression, Refolding, Purification and Characterization of Pseudomonas aeruginosa Type B-Flagellin: An Improved Method Without Sonication.
abstract: Pseudomonas aeruginosa as an opportunistic pathogen is a significant cause of acute and chronic infections in patients with compromised defenses. This bacterium is motile via a single polar flagellum made of polymerized flagellin subunits differentiated into two major serotypes: A and B. flagellin plays an important role as a virulence factor in the adhesion, colonization and invasion of P. aeruginosa into host epithelial cells. To develop a functional vaccine that can be used in practical application to prevent and treat infection, type B-flagellin was produced as recombinant protein. In this work, the fliC gene was introduced into a pET28a vector and expressed in Escherichia coli BL21 (DE3). The expressed recombinant protein was purified by a modified method without sonication using a HisTrap affinity column. The functional activities of produced flagellin were confirmed by ELISA, western blot analysis, motility inhibition assay and opsonophagocytosis test. The purification process of the type B-flagellin was lead to a high yield. The produced recombinant type B-flagellin showed high biological activity in all of these standard assays. In conclusions, this report provides the new protocol to efficiently obtain the type B-flagellin with high biological activity and immunogenicity. This immunogen can be introduced as an adjuvant or vaccine in the future study.
authors.affiliation: Departments of Mycobacteriology and Pulmonary Research, Pasteur Institute of Iran, Tehran, Iran.
authors.forename: Sobhan
authors.initials: S
authors.lastname: Faezi
authors.affiliation: Departments of Mycobacteriology and Pulmonary Research, Pasteur Institute of Iran, Tehran, Iran.
authors.forename: Ahmad Reza
authors.initials: AR
authors.lastname: Bahrmand
authors.affiliation: Departments of Immunology, Pasteur Institute of Iran, Tehran, Iran.
authors.forename: Mehdi
authors.initials: M
authors.lastname: Mahdavi
authors.affiliation: Departments of Mycobacteriology and Pulmonary Research, Pasteur Institute of Iran, Tehran, Iran.
authors.forename: Seyed Davar
authors.initials: SD
authors.lastname: Siadat
authors.affiliation: Laboratory of Microbiology and Immunology of Infectious Diseases, Paramedicine Faculty, Guilan University of Medical Sciences, Guilan, Iran.
authors.forename: Iraj
authors.initials: I
authors.lastname: Nikokar
authors.affiliation: Biotechnology Research Center, Drug Design and Bioinformatics Group, Pasteur Institute of Iran, Tehran, Iran.
authors.forename: Soroush
authors.initials: S
authors.lastname: Sardari
authors.affiliation: Departments of Microbiology and Surgery, College of Medicine, University of Cincinnati, and Shriners Burns Institute, Cincinnati, Ohio, USA.
authors.forename: Ian Alan
authors.initials: IA
authors.lastname: Holder
keywords: Pseudomonas aeruginosa; flagellin protein; pET28a; purification; vaccine