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J Virol, May 1998, p. 3539-3546, Vol. 72, No. 5
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Functional Role of Hepatitis C Virus Chimeric Glycoproteins in the Infectivity of Pseudotyped Virus

L. Martin Lagging,1,dagger Keith Meyer,1 Randall J. Owens,2 and Ranjit Ray1,*

Saint Louis University Health Sciences Center, St. Louis, Missouri 63110,1 and St. Jude Children's Research Hospital, Memphis, Tennessee 381052

Received 12 September 1997/Accepted 21 January 1998

The putative envelope glycoproteins of hepatitis C virus (HCV) likely play an important role in the initiation of viral infection. Available information suggests that the genomic regions encoding the putative envelope glycoproteins, when expressed as recombinant proteins in mammalian cells, largely accumulate in the endoplasmic reticulum. In this study, genomic regions which include the putative ectodomain of the E1 (amino acids 174 to 359) and E2 (amino acids 371 to 742) glycoproteins were appended to the transmembrane domain and cytoplasmic tail of vesicular stomatitis virus (VSV) G protein. This provided a membrane anchor signal and the VSV incorporation signal at the carboxy termini of the E1 and E2 glycoproteins. The chimeric gene constructs exhibited expression of the recombinant proteins on the cell surface in a transient expression assay. When infected with a temperature-sensitive VSV mutant (ts045) and grown at the nonpermissive temperature (40.5°C), cells transiently expressing the E1 or E2 chimeric glycoprotein generated VSV/HCV pseudotyped virus. The resulting pseudotyped virus generated from E1 or E2 surprisingly exhibited the ability to infect mammalian cells and sera derived from chimpanzees immunized with the homologous HCV envelope glycoproteins neutralized pseudotyped virus infectivity. Results from this study suggested a potential functional role for both the E1 and E2 glycoproteins in the infectivity of VSV/HCV pseudotyped virus in mammalian cells. These observations further suggest the importance of using both viral glycoproteins in a candidate subunit vaccine and the potential for using a VSV/HCV pseudotyped virus to determine HCV neutralizing antibodies.

* Corresponding author. Mailing address: Division of Infectious Diseases and Immunology, Saint Louis University Health Sciences Center, 3635 Vista Ave., St. Louis, MO 63110. Phone: (314) 577-8648. Fax: (314) 771-3816. E-mail: rayr{at}wpogate.slu.edu.

dagger Present address: Department of Infectious Diseases, Sahlgrenska University Hospital, 416 85 Gothenburg, Sweden.

J Virol, May 1998, p. 3539-3546, Vol. 72, No. 5
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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