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J Virol. 1994 June; 68(6): 4063-4066

The middle hepatitis B virus envelope protein is not necessary for infectivity of hepatitis delta virus.

C Sureau, B Guerra and H Lee

Department of Virology and Immunology, Southwest Foundation for Biomedical Research, San Antonio, Texas 78228.

ABSTRACT

The hepatitis delta virus (HDV) envelope contains the large (L), middle (M), and small (S) surface proteins encoded by coinfecting hepatitis B virus. Although HDV-like particles can be assembled with only the S protein in the envelope, the L protein is essential for infectivity in vitro (C. Sureau, B. Guerra, and R. Lanford, J. Virol. 67:366-372, 1993). Here, we demonstrate that the M protein, previously described as carrying a site for binding to polymerized human albumin, is not necessary for infectivity. HDV-like particles coated with the S plus L or the S plus M plus L proteins are infectious in primary cultures of chimpanzee hepatocytes. We conclude that the S and L proteins serve two essential functions in the HDV replication cycle; the S protein ensures the export of the HDV genome from an infected cell by forming a particle, and the L protein ensures its import into a human hepatocyte.

J Virol. 1994 June; 68(6): 4063-4066




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