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Viruses 2017, 9(3), 56; doi:10.3390/v9030056

Complete and Incomplete Hepatitis B Virus Particles: Formation, Function, and Application

1
Department of Microbiology and Immunology, Penn State University College of Medicine, Hershey, PA 17033, USA
2
College of Life Sciences, Zhejiang Sci-Tech University, Hangzhou 310018, China
*
Author to whom correspondence should be addressed.
Academic Editors: Ulrike Protzer and Michael Nassal
Received: 8 February 2017 / Revised: 11 March 2017 / Accepted: 17 March 2017 / Published: 21 March 2017
(This article belongs to the Special Issue Recent Advances in Hepatitis B Virus Research)
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Abstract

Hepatitis B virus (HBV) is a para-retrovirus or retroid virus that contains a double-stranded DNA genome and replicates this DNA via reverse transcription of a RNA pregenome. Viral reverse transcription takes place within a capsid upon packaging of the RNA and the viral reverse transcriptase. A major characteristic of HBV replication is the selection of capsids containing the double-stranded DNA, but not those containing the RNA or the single-stranded DNA replication intermediate, for envelopment during virion secretion. The complete HBV virion particles thus contain an outer envelope, studded with viral envelope proteins, that encloses the capsid, which, in turn, encapsidates the double-stranded DNA genome. Furthermore, HBV morphogenesis is characterized by the release of subviral particles that are several orders of magnitude more abundant than the complete virions. One class of subviral particles are the classical surface antigen particles (Australian antigen) that contain only the viral envelope proteins, whereas the more recently discovered genome-free (empty) virions contain both the envelope and capsid but no genome. In addition, recent evidence suggests that low levels of RNA-containing particles may be released, after all. We will summarize what is currently known about how the complete and incomplete HBV particles are assembled. We will discuss briefly the functions of the subviral particles, which remain largely unknown. Finally, we will explore the utility of the subviral particles, particularly, the potential of empty virions and putative RNA virions as diagnostic markers and the potential of empty virons as a vaccine candidate. View Full-Text
Keywords: hepatitis B virus; virion; empty virion; Australian antigen; HBsAg; HBcAg; subviral particles; CCC DNA; diagnosis; vaccine hepatitis B virus; virion; empty virion; Australian antigen; HBsAg; HBcAg; subviral particles; CCC DNA; diagnosis; vaccine
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Hu, J.; Liu, K. Complete and Incomplete Hepatitis B Virus Particles: Formation, Function, and Application. Viruses 2017, 9, 56.

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