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. 1992 Feb;66(2):1084–1090. doi: 10.1128/jvi.66.2.1084-1090.1992

Divergent envelope E2 alphavirus sequences spanning amino acids 297 to 352 induce in mice virus-specific protective immunity and antibodies with complement-mediated cytolytic activity.

H Grosfeld 1, S Lustig 1, Y Gozes 1, B Velan 1, S Cohen 1, M Leitner 1, B Lachmi 1, D Katz 1, U Olshevski 1, A Shafferman 1
PMCID: PMC240812  PMID: 1309890

Abstract

We have proposed a general algorithm for identification of potential immunoprotective domains (cassettes) on the envelope E2 polypeptide of alphaviruses (H. Grosfeld, B. Velan, M. Leitner, S. Cohen, S. Lustig, B.E. Lachmi, and A. Shafferman, J. Virol. 63:3416-3422, 1989). To assess the generality of our approach, we compared analogous E2 cassettes from Sindbis virus (SIN) and Semliki Forest virus (SFV), two alphaviruses which are philogenetically very remote. The antigenically distinct SFV E2 and SIN E2 cassettes exhibit comparable immunological characteristics. Most significantly, the SIN E2 LMN cassette cluster (E2 amino acids 297 to 352 fused to beta-galactosidase), like the analogous SFV E2 LMN cassettes, elicited high titers of antivirus antibodies in mice and proved to be highly effective in protection against lethal challenge. Mice immunized with SIN E2 LMN were completely protected against intracerebral challenge of 10 to 100 50% lethal doses of different neurovirulent SIN strains. Anti-SIN LMN antibodies, like anti-SFV LMN antibodies, lacked in vitro neutralizing activity, yet both exerted protection against homologous challenge upon transfer to mice. The two antibody preparations exhibited virus-specific complement-mediated cytolysis of cells infected with the homologous but not heterologous virus. These results suggest a possible mechanism for virus-specific E2 LMN-induced protection and demonstrate the generality of our methodology for deciphering immunogenic and protective domains in alphavirus systems. Results suggest also that the E2 LMN sequence of any given alphavirus should be considered as a component of a synthetic vaccine against that specific virus.

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Selected References

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