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Intracellular Trafficking of HBV Particles
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Journal Article
Intracellular Trafficking of HBV Particles
2020
Overview
The human hepatitis B virus (HBV), that is causative for more than 240 million cases of chronic liver inflammation (hepatitis), is an enveloped virus with a partially double-stranded DNA genome. After virion uptake by receptor-mediated endocytosis, the viral nucleocapsid is transported towards the nuclear pore complex. In the nuclear basket, the nucleocapsid disassembles. The viral genome that is covalently linked to the viral polymerase, which harbors a bipartite NLS, is imported into the nucleus. Here, the partially double-stranded DNA genome is converted in a minichromosome-like structure, the covalently closed circular DNA (cccDNA). The DNA virus HBV replicates via a pregenomic RNA (pgRNA)-intermediate that is reverse transcribed into DNA. HBV-infected cells release apart from the infectious viral parrticle two forms of non-infectious subviral particles (spheres and filaments), which are assembled by the surface proteins but lack any capsid and nucleic acid. In addition, naked capsids are released by HBV replicating cells. Infectious viral particles and filaments are released via multivesicular bodies; spheres are secreted by the classic constitutive secretory pathway. The release of naked capsids is still not fully understood, autophagosomal processes are discussed. This review describes intracellular trafficking pathways involved in virus entry, morphogenesis and release of (sub)viral particles.
Publisher
MDPI AG,MDPI
Subject
/ Capsids
/ DNA
/ entry
/ Genomes
/ Hepatitis B Core Antigens - genetics
/ Hepatitis B Core Antigens - metabolism
/ Hepatitis B e Antigens - genetics
/ Hepatitis B e Antigens - metabolism
/ Hepatitis B Surface Antigens - genetics
/ Hepatitis B Surface Antigens - metabolism
/ Hepatitis B virus - genetics
/ Hepatitis B virus - growth & development
/ Hepatitis B virus - metabolism
/ Hepatitis B, Chronic - genetics
/ Hepatitis B, Chronic - pathology
/ Hepatitis B, Chronic - virology
/ Host-Pathogen Interactions - genetics
/ Humans
/ Nucleocapsid - ultrastructure
/ Proteins
/ release
/ Review
/ RNA
/ Symmetry
/ Virion - growth & development
/ Virions
/ Viruses
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