ICTV Virus Taxonomy Profile: Bicaudaviridae

Prangishvili, David; Krupovìč, Mart

doi:10.1099/jgv.0.001106

Cited by 11 publications

(8 citation statements)

References 11 publications

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“…9). Acidianus two-tailed virus and Sulfolobus monocaudavirus 3 are spindle-shaped viruses which also include genetically distant but morphologically similar S. tengchongensis spindle-shaped virus 1 (STSV1), S. tengchongensis spindle-shaped virus 2 (STSV2), Acidianus tailed spindle virus (ATSV), and Sulfolobus monocaudavirus 1 (SMV1), all members of the family Bicaudaviridae (Prangishvili et al, 2018). We previously reported a virus-induced cell enlargement of S. islandicus REY15A by SMV1 and STSV2, illuminating the inherent plasticity of Sulfolobus cells, which might be relevant for eukaryogenesis (Liu et al, 2021a).…”

Section: Discussionmentioning

confidence: 99%

A novel RHH family transcription factor aCcr1 and its viral homologs dictate cell cycle progression in archaea

Yang

Liu

et al. 2022

Preprint

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Cell cycle regulation is of paramount importance for all forms of life. Here we report that a transcription factor and its viral homologs control cell division in Sulfolobales. The 58-aa-long RHH (ribbon-helix-helix) family protein (designated as aCcr1) is conserved in Crenarchaeota and diverse Sulfolobales viruses. aCcr1 is essential for cell viability of Saccharolobus islandicus REY15A (formally Sulfolobus islandicus REY15A) and exhibits a cyclic transcription pattern, with the highest level being reached during active cell division (D-phase), subsequent to the expression of CdvA, an archaea-specific cell division protein. Cells over-expressing cellular aCcr1 as well as the homologs encoded by large spindle-shaped viruses Acidianus two-tailed virus (ATV) and Sulfolobus monocaudavirus 3 (SMV3) show significant growth retardation and cell division failure, manifested as enlarged cells with multiple chromosomes. aCcr1 over-expression results in downregulation of over a dozen of genes including the cdvA gene. A conserved motif, aCcr1-box, located between the TATA-binding box and the translation initiation site in the promoters of 13 out of the 17 repressed genes, is critical for the aCcr1 binding. The aCcr1-box is present in the promoters of cdvA genes across Sulfolobales, suggesting that aCcr1-mediated cdvA repression is an evolutionarily conserved mechanism by which archaeal cells dictate cytokinesis progression, whereas their viruses take advantage of this mechanism to manipulate the host cell cycle.

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Section: Discussionmentioning

confidence: 99%

A novel RHH family transcription factor aCcr1 and its viral homologs dictate cell cycle progression in archaea

Yang

Liu

et al. 2022

Preprint

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“…Virus Taxonomy: The Classification and Nomenclature of Viruses -The Online (10th) Report of the ICTV is freely accessible at http://ictv.globa l/repor t, and summaries of the chapters on each virus family are published in the Journal of General Virology. We would like to acknowledge the hard work of David Prangishvili and Mart Krupovic for contributing chapters on archaeal (Ampullaviridae [21], Bicaudaviridae [22], Globuloviridae [23], Guttaviridae [24], Spiraviridae [25], Tristromaviridae [26], and bacterial (Plasmaviridae [27]) viruses.…”

Section: Online (10th) Report Of the Ictvmentioning

confidence: 99%

Taxonomy of prokaryotic viruses: 2018-2019 update from the ICTV Bacterial and Archaeal Viruses Subcommittee

et al. 2020

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“…Morphologically similar viruses have been also isolated from hyperthermophilic marine euryarchaea (Geslin et al, 2003;Gorlas et al, 2012), but remain unclassified. Larger spindle-shaped viruses that contain one or two tail-like appendages protruding from the pointed ends of the virion are classified into the family Bicaudaviridae (Prangishvili et al, 2018b;Prangishvili et al, 2006). Another prominent group of archaeal viruses includes filamentous viruses with dsDNA genomes classified into the families Rudiviridae (Prangishvili et al, 1999), Lipothrixviridae, Tristromaviridae (Prangishvili et al, 2019b) and Clavaviridae (Prangishvili et al, 2019a) (Figure 1).…”

Section: Introduction: Diversity Of Archaeal Virusesmentioning

confidence: 99%

Structure and assembly of archaeal viruses

Baquero

Liu

Wang

et al. 2020

Advances in Virus Research

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Viruses of archaea represent one of the most enigmatic parts of the virosphere. Most of the characterized archaeal viruses infect extremophilic hosts and display remarkable diversity of virion morphotypes, many of which have never been observed among bacteriophages or viruses of eukaryotes. However, recent environmental studies have shown that archaeal viruses are widespread also in moderate ecosystems, where they play an important ecological role by influencing the turnover of microbial communities, with a global impact on the carbon and nitrogen cycles. In this review, we summarize recent advances in understanding the molecular details of virion organization and assembly of archaeal viruses. We start by briefly introducing the 20 officially recognized families of archaeal viruses and then outline the similarities and differences of archaeal virus assembly with the morphogenesis pathways used by bacterial and eukaryotic viruses, and discuss the evolutionary implications of these observations. Generally, the assembly of the icosahedral archaeal viruses closely follows the mechanisms employed by evolutionarily related bacterial and eukaryotic viruses with the HK97 fold and double jelly-roll major capsid proteins, emphasizing the overall conservation of these pathways over billions of years of evolution. By contrast, archaea-specific viruses employ unique virion assembly mechanisms. We also highlight some of the molecular adaptations underlying the stability of archaeal viruses in extreme environments. Despite considerable progress during the past few years, the archaeal virosphere continues to represent one of the least studied parts of the global virome, with many molecular features awaiting to be discovered and characterized.

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ICTV Virus Taxonomy Profile: Bicaudaviridae

Cited by 11 publications

References 11 publications

A novel RHH family transcription factor aCcr1 and its viral homologs dictate cell cycle progression in archaea

A novel RHH family transcription factor aCcr1 and its viral homologs dictate cell cycle progression in archaea

Taxonomy of prokaryotic viruses: 2018-2019 update from the ICTV Bacterial and Archaeal Viruses Subcommittee

Structure and assembly of archaeal viruses

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