Expression of Neisseria meningitidis class 1 porin as a fusion protein in Escherichia coli: the influence of liposomes and adjuvants on the production of a bactericidal immune response


Ward, Stephen J., Scopes, Deborah, Christodoulides, Myron, Clarke, Ian N. and Heckels, John E. (1996) Expression of Neisseria meningitidis class 1 porin as a fusion protein in Escherichia coli: the influence of liposomes and adjuvants on the production of a bactericidal immune response. Microbial Pathogenesis, 21, (6), 499-512. (doi:10.1006/mpat.1996.0079). (PMID:8971689).

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Description/Abstract

High level expression of meningococcal class 1 protein was achieved in Escherichia coli using the p-GEMEX-1 vector, in which the protein was expressed in inclusion bodies (IB), as a fusion with the bacteriophage T7 gene 10 capsid protein. The fusion protein (FP) was engineered with a factor Xa protease site between the gene 10 and class 1 protein, but treatment with the enzyme resulted in cleavage at additional sites within the class 1 protein. Since it was not possible to remove the leader protein, the intact FP provided an alternative antigen for immunization. Antisera raised to FP, solubilized from IB and incorporated into liposomes, generated a subtype-specific response which was weakly bactericidal for meningococci. In order to remove any possible effect of E. coli LPS present in IB, the FP was further purified by SDS-PAGE and incorporated into liposomes, either alone or in combination with the adjuvants monophosphoryl lipid A or muramyl dipeptide. The incorporation of adjuvants in liposomes resulted in stimulation of the overall immune response to FP, but the resulting antisera were not bactericidal. However an effective bactericidal response was obtained with the purest preparation of FP in liposomes, without any additional adjuvants, revealing that attempts to increase further the immunogenicity of such antigens must not be at the expense of interfering with optimal protein folding.

Item Type: Article
ISSNs: 0882-4010 (print)
1096-1208 (electronic)
Keywords: neisseria meningitidis, outer membrane protein, expression system, liposome, adjuvant, vaccine
Subjects: H Social Sciences > HC Economic History and Conditions
H Social Sciences > HD Industries. Land use. Labor
H Social Sciences > HD Industries. Land use. Labor > HD28 Management. Industrial Management
Q Science > QR Microbiology > QR180 Immunology
Q Science > QR Microbiology > QR355 Virology
R Medicine > RB Pathology
Divisions: University Structure - Pre August 2011 > School of Medicine > Infection, Inflammation and Repair
ePrint ID: 193819
Date Deposited: 20 Jul 2011 13:48
Last Modified: 27 Mar 2014 19:44
URI: http://eprints.soton.ac.uk/id/eprint/193819

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