Behrouz B, Amirmozafari N, Khoramabadi N, Bahroudi M, Legaee P, Mahdavi M. Cloning, Expression, and Purification of Pseudomonas aeruginosa Flagellin, and Characterization of the Elicited Anti-Flagellin Antibody.
IRANIAN RED CRESCENT MEDICAL JOURNAL 2016;
18:e28271. [PMID:
27621933 PMCID:
PMC5004508 DOI:
10.5812/ircmj.28271]
[Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/25/2015] [Revised: 03/30/2015] [Accepted: 04/15/2015] [Indexed: 11/16/2022]
Abstract
BACKGROUND
Pseudomonas aeruginosa is an important opportunistic human pathogen that causes serious infections in immunocompromised hosts. The single polar flagellum is an important factor in both virulence and colonization.
OBJECTIVES
As flagellin is the major component of the flagellar filament, the main aims of the present study are to identify, clone, express, and purify the recombinant type B flagellin (r-B-flagellin) of P. aeruginosa, as well as to evaluate the functional activity of the rabbit polyclonal antibody raised against this r-B-flagellin.
MATERIALS AND METHODS
In the current experimental study, the r-B-flagellin gene was isolated from the P. aeruginosa PAO1 strain by PCR. It was cloned into the pET-28a vector and then transformed into the E. coli BL21 strain. Next, r-B-flagellin was overexpressed and affinity purified by Ni-NTA agarose-affinity chromatography, followed by on-column resolubilization. Polyclonal antisera against the recombinant flagellin were raised in rabbits, and the functional activity of the anti-r-B-flagellin antibody was determined by in vitro assays.
RESULTS
The polyclonal antibodies raised against this r-B-flagellin inhibited the motility of the homologous PAO1 strain of P. aeruginosa, which significantly decreased the invasion of the PAO1 strain into the A549 cells and also enhanced the opsonophagocytosis of this strain. However, our polyclonal antibody showed little effect on the heterologous PAK strain.
CONCLUSIONS
The r-B-flagellin carried antigenic epitopes just like the native flagellin, while the polyclonal antibody raised against it exhibited functional activity.
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