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Descriptions are generated automatically from the ICTVdB database including links. Some descriptions are only very basic and links may point to documents that are not yet published on the Web.

00.051.0.01. Chlorovirus

Cite this publication as: ICTVdB Management (2006). 00.051.0.01. Chlorovirus. In: ICTVdB - The Universal Virus Database, version 4. Büchen-Osmond, C. (Ed), Columbia University, New York, USA

Cite this site as: ICTVdB - The Universal Virus Database, version 4. http://www.ncbi.nlm.nih.gov/ICTVdb/ICTVdB/

Table of Contents

Classification

This is a description of an algal virus at the genus level.

ICTVdB Virus Code: 00.051.0.01. Virus accession number: 051001GE. Obsolete virus code: 51.0.1.; superceded accession number: 51010000.
NCBI Taxon Identifier NCBI Taxonomy ID: 181083.

Name, Synonyms and Lineage

Synonym(s): dsDNA Phycovirus group. Virus is of the family 00.051. Phycodnaviridae.

Virion Properties

Morphology

Virions consist of a capsid. Virus capsid is not enveloped. Virion attaches to host cell surface and releases DNA into the host cell in a similar fashion as Tectiviridae. Capsid/nucleocapsid is round and exhibits polyhedral symmetry. The isometric capsid has a diameter of 150-190 nm. The capsid shells of virions are composed of multiple layers (multilaminated capsid). Capsids appear hexagonal in outline.

Nucleic Acid

The Mr of the genome constitutes 21-25% of the virion by weight. The genome is not segmented and contains a single molecule of linear double-stranded DNA. The complete genome is 300000-350000 nucleotides long. The genome has a guanine + cytosine content of 40-52 %. The genome contains unusual bases (varying from 0.1-47 %), they are 5-methyl deoxy-cytosine residues and N6-methyl deoxy-adenosine residues (in some DNAs). Double stranded DNA is non-permuted; the genome sequence has termini with cross-linked hairpin ends. The genome minus the hairpin has terminally redundant sequences. The terminally redundant sequences have inverted terminal repetitions (ITR) (for at least 2000 bases).

GenBank records for nucleotide sequences; complete genome sequences.

Proteins

Proteins constitute about 64% of the particle weight.

The viral genome encodes structural proteins and non-structural proteins.

Lipids

Lipids are present and located in the internal component (located inside the glycoprotein shell). Virions are composed of 5-10% lipids by weight (beneath the outer glycoprotein shell). Lipids are essential for infectivity.

Biological Properties

Natural Host

Domain
Viral hosts belong to the Domain Eucarya.

Domain Eucarya
Kingdom Protoctistae.

Kingdom Protoctista Division Chlorophyta (Green Algae).

Taxonomic Structure of the Genus

Type species 00.051.0.01.001. Paramecium bursaria Chlorella virus 1 .

Species in the Genus

List of Species in the Genus.

Data Sources and Contributions

The description has been compiled from data in the ICTV Report presented by van Etten JL.

References

The following generic references are cited in the most recent ICTV Report.

PubMed References.

Taxonomic Proposals and Changes

Host range is limited to eukaryotic algae with the appropriate receptor. Three groups of viruses are delineated based on host specificity.

Group 1. Paramecium bursaria Chlorella NC64A viruses (NC64A viruses)

Group 2. Paramecium bursaria Chlorella Pbi viruses (Pbi viruses)

Group 3. Hydra viridis Chlorella viruses (HVCV).

Chlorella strains NC64A, ATCC 30562, and N1A (originally symbionts of the protozoan P. bursaria), collected in the United States, are the only known hosts for NC64A viruses. Chlorella strain Pbi (originally a symbiont of a European strain of P. bursaria) collected in Germany, is the only known host for Pbi viruses. Pbi viruses do not infected Chlorella strains NC64A, ATCC 30562, and N1A. Chlorella strain Florida (originally a symbiont of Hydra viridis) is the only known host for HVCV. NC64A viruses are placed in 16 subgroups based on plaque size, serological reactivity, resistance to restriction endonucleases, and nature and content of methylated bases.

Images

Taxon images: • EM courtesy of Jim van Etten.

The description has been generated automatically from DELTA files.

ICTVdB - The Universal Virus Database, developed for the International Committee on Taxonomy of Viruses (ICTV) by Dr Cornelia Büchen-Osmond, is written in DELTA. The virus descriptions in ICTVdB are coded by ICTV members and experts, or by the ICTVdB Management using data provided by the experts, the literature or the latest ICTV Report. The character list is the underlying code. All virus descriptions are based on the character list and natural language translations from the encoded descriptions are automatically generated and formatted for display on the Web.

Developer of the DELTA software: M. J. Dallwitz, T. Paine and E. Zurcher

ICTVdB and DELTA related References

Comments to ICTVdB Management
Last updated on 25 April 2006 by Cornelia Büchen-Osmond
Copyright © 2002 International Committee on Taxonomy of Viruses. All rights reserved.

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