Identification of vaccine candidates from differentially expressed outer membrane proteins of Vibrio alginolyticus in response to NaCl and iron limitation.
Vibrio alginolyticus is the etiological agent that causes great losses in aquacultures and clinical emanating cases in humans. Identification of highly efficient vaccine candidates to control V. alginolyticus infection has been highly concerned since vaccines offer a powerful approach to provide efficient protection from bacterial infections. In the present study, we firstly investigated the altered outer membrane proteins (OM proteins) of V. alginolyticus in response to NaCl concentrations and iron limitation using Western blotting, and then identified the protective activity of these altered OM proteins by bacterial challenge post immunization. Ten OM proteins were differentially expressed in response to the osmolarity changing or/and iron limitation, in which VA2212, OmpV, VPA1186, OmpU, VPA1644, VA1061, VA1631 and VPA0860 were markedly altered in response to osmolarity, and VPA1186, OmpU, OmpV, VA0449, VPA0860, VPA1435 and VA1631 were determined to be iron-limited responsive proteins. Out of the ten OM proteins, VA1061, OmpU, VPA1435 and VPA0860 could be effective vaccine candidates against infection by V. alginolyticus in vivo. Further results indicated that VA1061 and VPA0860 were dominant antigens and could stimulate hosts to produce stronger antibody response than other two in live or inactivated whole-cell vaccines. These results not only expand knowledge on osmolarity-, iron-responsive proteins, but also provide a valuable strategy for identify protective proteins suitable for use in vaccine development.
Xiong
Xiao-Peng
XP
Center for Proteomics, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China.
Zhang
Bing-Wen
BW
Yang
Man-Jun
MJ
Ye
Ming-Zhi
MZ
Peng
Xuan-Xian
XX
Li
Hui
H
D000818:Animals; D001425:Bacterial Outer Membrane Proteins / Q000276:immunology* / Q000378:metabolism*; D001428:Bacterial Vaccines / Q000276:immunology*; D015153:Blotting, Western; D055808:Drug Discovery / Q000379:methods*; D004591:Electrophoresis, Polyacrylamide Gel; D004797:Enzyme-Linked Immunosorbent Assay; D015964:Gene Expression Regulation, Bacterial / Q000502:physiology*; D007106:Immune Sera / Q000276:immunology; D007501:Iron / Q000378:metabolism; D000090463:Iron Deficiencies; D051379:Mice; D012965:Sodium Chloride / Q000378:metabolism; D044149:Vibrio alginolyticus / Q000276:immunology*
D001425:Bacterial Outer Membrane Proteins; D001428:Bacterial Vaccines; D007106:Immune Sera; D012965:Sodium Chloride; D007501:Iron