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J Virol, July 1998, p. 5573-5578, Vol. 72, No. 7
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Role of the Pre-S2 Domain of the Large Envelope Protein in Hepatitis B Virus Assembly and Infectivity

J. Le Seyec,* P. Chouteau, I. Cannie, C. Guguen-Guillouzo, and P. Gripon

Unité de Recherches Hépatologiques U 49, Institut National de la Santé et de la Recherche Médicale, Hôpital de Pontchaillou, 35033 Rennes Cedex, France

Received 28 October 1997/Accepted 18 March 1998

Among the three viral proteins present in the hepatitis B virus (HBV) envelope, both the small and large polypeptides, but not the middle polypeptide, are necessary for the production of complete viral particles. Whereas it has been established that the C-terminal extremity of the pre-S1 region is required for HBV morphogenesis, whether the pre-S2 region of the large surface protein plays a critical role remains questionable. In the present study, we have analyzed the role of the large-polypeptide pre-S2 region in viral maturation and infectivity. For this purpose, mutants bearing contiguous deletions covering the entire pre-S2 domain were generated. First, the efficient expression of all the mutant large envelope proteins was verified and their ability to substitute for the wild-type form in virion secretion was tested. We found that distinct deletions covering the domain between amino acids 114 and 163 still allowed virion production. In contrast, the polypeptide lacking the first 5 amino acids of pre-S2 (amino acids 109 to 113) was unable to support viral secretion. This result shows that the domain of the large surface protein, required for this process, must be extended to the N-terminal extremity of pre-S2. We then demonstrated that all the mutants competent for virion release were able to infect normal human hepatocytes in primary culture. Taken together, these results indicate that only 10% of the large-protein pre-S2 region at its N-terminal extremity is essential for virion export and that the remaining part, dispensable for viral secretion, is also dispensable for infectivity.

* Corresponding author. Mailing address: Unité de Recherches Hépatologiques, INSERM U 49, Hôpital de Pontchaillou, 35033 Rennes Cedex, France. Phone: (33) 2 99 54 37 37. Fax: (33) 2 99 54 01 37. E-mail: Jacques.Leseyec{at}rennes.inserm.fr.

J Virol, July 1998, p. 5573-5578, Vol. 72, No. 7
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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