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Journal of Virology, November 2000, p. 10623-10630, Vol. 74, No. 22
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Expression of the Two Major Envelope Proteins of Equine Arteritis Virus as a Heterodimer Is Necessary for Induction of Neutralizing Antibodies in Mice Immunized with Recombinant Venezuelan Equine Encephalitis Virus Replicon Particles

Udeni B. R. Balasuriya,1 Hans W. Heidner,2 Jodi F. Hedges,1 Jacqueline C. Williams,2 Nancy L. Davis,3 Robert E. Johnston,3 and N. James MacLachlan1,*

Bernard and Gloria Salick Equine Viral Disease Laboratory, Department of Pathology, Microbiology and Immunology, School of Veterinary Medicine, University of California, Davis, California 956161; Division of Life Sciences, University of Texas at San Antonio, San Antonio, Texas 782492; and Department of Microbiology and Immunology, University of North Carolina, Chapel Hill, North Carolina 275993

Received 16 May 2000/Accepted 15 August 2000

RNA replicon particles derived from a vaccine strain of Venezuelan equine encephalitis virus (VEE) were used as a vector for expression of the major envelope proteins (GL and M) of equine arteritis virus (EAV), both individually and in heterodimer form (GL/M). Open reading frame 5 (ORF5) encodes the GL protein, which expresses the known neutralizing determinants of EAV (U. B. R. Balasuriya, J. F. Patton, P. V. Rossitto, P. J. Timoney, W. H. McCollum, and N. J. MacLachlan, Virology 232:114-128, 1997). ORF5 and ORF6 (which encodes the M protein) of EAV were cloned into two different VEE replicon vectors that contained either one or two 26S subgenomic mRNA promoters. These replicon RNAs were packaged into VEE replicon particles by VEE capsid protein and glycoproteins supplied in trans in cells that were coelectroporated with replicon and helper RNAs. The immunogenicity of individual replicon particle preparations (pVR21-GL, pVR21-M, and pVR100-GL/M) in BALB/c mice was determined. All mice developed antibodies against the recombinant proteins with which they were immunized, but only the mice inoculated with replicon particles expressing the GL/M heterodimer developed antibodies that neutralize EAV. The data further confirmed that authentic posttranslational modification and conformational maturation of the recombinant GL protein occur only in the presence of the M protein and that this interaction is necessary for induction of neutralizing antibodies.


* Corresponding author. Mailing address: Department of Pathology, Microbiology and Immunology, School of Veterinary Medicine, One Shields Ave., University of California, Davis, CA 95616. Phone: (530) 752-1385. Fax: (530) 754-8124. E-mail: njmaclachlan{at}ucdavis.edu.


Journal of Virology, November 2000, p. 10623-10630, Vol. 74, No. 22
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.



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