T. Carmenate et al., Recombinant Opc protein from Neisseria meningitidis reconstituted into liposomes elicits opsonic antibodies following immunization, BIOT APP B, 34, 2001, pp. 63-69
The reconstitution of recombinant bacterial outer membrane proteins (OMPs)
into their native conformations after purification has been the major probl
em in their use as effective vaccines. Liposomes have been shown to be an a
ttractive approach, providing a native-like environment for these antigens.
The meningococcal recombinant Opc (rOpc) protein, produced as inclusion bo
dies in Escherichia coli, was incorporated into phospholipid vesicles consi
sting of dipalmitoyl phosphatidylcholine and cholesterol. The incorporation
of rOpc into the lipid bilayer was demonstrated, and the reconstitution of
some native epitopes was tested using a set of monoclonal antibodies. Subc
utaneous immunization of Balb/c mice with rOpc-containing vesicles resulted
in the generation of a high level of specific antibodies. The elicited ant
ibodies reacted with the native meningococcal protein and showed opsonic ac
tivity.