Elsevier

Virus Research

Volume 202, 16 April 2015, Pages 12-32
Virus Research

What we know but do not understand about nidovirus helicases

https://doi.org/10.1016/j.virusres.2014.12.001Get rights and content

Highlights

  • The ubiquitous nidovirus helicase is a multi-functional enzyme of superfamily 1.

  • Its unique N-terminal domain is most similar to the Upf1 multinuclear zinc-binding domain.

  • It has been implicated in replication, transcription, virion biogenesis, translation and post-transcriptional viral RNA processing.

  • Four different classes of antiviral compounds targeting the helicase have been identified.

Abstract

Helicases are versatile NTP-dependent motor proteins of monophyletic origin that are found in all kingdoms of life. Their functions range from nucleic acid duplex unwinding to protein displacement and double-strand translocation. This explains their participation in virtually every metabolic process that involves nucleic acids, including DNA replication, recombination and repair, transcription, translation, as well as RNA processing. Helicases are encoded by all plant and animal viruses with a positive-sense RNA genome that is larger than 7 kb, indicating a link to genome size evolution in this virus class. Viral helicases belong to three out of the six currently recognized superfamilies, SF1, SF2, and SF3. Despite being omnipresent, highly conserved and essential, only a few viral helicases, mostly from SF2, have been studied extensively. In general, their specific roles in the viral replication cycle remain poorly understood at present. The SF1 helicase protein of viruses classified in the order Nidovirales is encoded in replicase open reading frame 1b (ORF1b), which is translated to give rise to a large polyprotein following a ribosomal frameshift from the upstream ORF1a. Proteolytic processing of the replicase polyprotein yields a dozen or so mature proteins, one of which includes a helicase. Its hallmark is the presence of an N-terminal multi-nuclear zinc-binding domain, the nidoviral genetic marker and one of the most conserved domains across members of the order. This review summarizes biochemical, structural, and genetic data, including drug development studies, obtained using helicases originating from several mammalian nidoviruses, along with the results of the genomics characterization of a much larger number of (putative) helicases of vertebrate and invertebrate nidoviruses. In the context of our knowledge of related helicases of cellular and viral origin, it discusses the implications of these results for the protein's emerging critical function(s) in nidovirus evolution, genome replication and expression, virion biogenesis, and possibly also post-transcriptional processing of viral RNAs. Using our accumulated knowledge and highlighting gaps in our data, concepts and approaches, it concludes with a perspective on future research aimed at elucidating the role of helicases in the nidovirus replication cycle.

Keywords

Antiviral drugs
Coronavirus
Discontinuous RNA synthesis
Post-transcriptional quality control
Viral replication
Superfamily 1 helicase

Cited by (0)

View Abstract