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TitleDeciphering the Origin and Evolution of Hepatitis B Viruses by Means of a Family of Non-enveloped Fish Viruses.
Journal, issue, pagesCell Host Microbe, Vol. 22, Issue 3, Page 387-399.e6, Year 2017
Publish dateSep 13, 2017
AuthorsChris Lauber / Stefan Seitz / Simone Mattei / Alexander Suh / Jürgen Beck / Jennifer Herstein / Jacob Börold / Walter Salzburger / Lars Kaderali / John A G Briggs / Ralf Bartenschlager /
PubMed AbstractHepatitis B viruses (HBVs), which are enveloped viruses with reverse-transcribed DNA genomes, constitute the family Hepadnaviridae. An outstanding feature of HBVs is their streamlined genome ...Hepatitis B viruses (HBVs), which are enveloped viruses with reverse-transcribed DNA genomes, constitute the family Hepadnaviridae. An outstanding feature of HBVs is their streamlined genome organization with extensive gene overlap. Remarkably, the ∼1,100 bp open reading frame (ORF) encoding the envelope proteins is fully nested within the ORF of the viral replicase P. Here, we report the discovery of a diversified family of fish viruses, designated nackednaviruses, which lack the envelope protein gene, but otherwise exhibit key characteristics of HBVs including genome replication via protein-primed reverse-transcription and utilization of structurally related capsids. Phylogenetic reconstruction indicates that these two virus families separated more than 400 million years ago before the rise of tetrapods. We show that HBVs are of ancient origin, descending from non-enveloped progenitors in fishes. Their envelope protein gene emerged de novo, leading to a major transition in viral lifestyle, followed by co-evolution with their hosts over geologic eras.
External linksCell Host Microbe / PubMed:28867387 / PubMed Central
MethodsEM (single particle)
Resolution8.0 - 9.0 Å
Structure data

EMDB-3822:
Structure of the full-length African cichlid nackednavirus icosahedral capsid
Method: EM (single particle) / Resolution: 8.0 Å

EMDB-3823:
Structure of the truncated African cichlid nackednavirus icosahedral capsid
Method: EM (single particle) / Resolution: 9.0 Å

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