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
S J WardJohn E Heckels

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 additio...Continue Reading

Citations

Apr 4, 2017·Pathogens and Disease·Myron Christodoulides, John Heckels
Sep 16, 2021·Expert Review of Vaccines·Myron ChristodoulidesJohn E Heckels

❮ Previous
Next ❯

Related Concepts

Related Feeds

Avian Influenza: Innate Immune Adjuvant

Adjuvants systems that are added to vaccines against avian influenza have be explored to enhance the innate immune system response against the virus. Here is the latest research on avian influenza and the innate immune adjuvant.

Avian Influenza: Innate Immune Adjuvant (ASM)

Adjuvants systems that are added to vaccines against avian influenza have be explored to enhance the innate immune system response against the virus. Here is the latest research on avian influenza and the innate immune adjuvant.