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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.

00.053. Plasmaviridae

Cite this publication as: ICTVdB Management (2006). 00.053. Plasmaviridae. In: ICTVdB - The Universal Virus Database, version 3. 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 a mycoplasma virus at the family level.

ICTVdB Virus Code: 00.053. Virus accession number: 00053FAM. Obsolete virus code: 53.; superceded accession number: 53000000.
NCBI Taxon Identifier NCBI Taxonomy ID: 10472.

Name, Synonyms and Lineage

Synonym(s): Pleomorphic Phages.

Virion Properties

Morphology

Virions consist of an envelope, a nucleoprotein complex, and a core, or a capsid. Virus capsid is enveloped. Virions are spherical to pleomorphic; spherical structures that lack cores are common (thin sections show particles with lucent centers, and virions with densely stained centers, seemingly containing condensed DNA). Virions measure (50-)80(-125) nm in diameter with a loose fitting membrane (baggy membrane). A regular capsid structure is not detectable. The core is spherical (and densely stained in thin sections, consists of a nucleoprotein complex. Structure not detectable, but images of thin sections are suggesting an asymmetric nucleoprotein condensation bounded by a lipid-protein membrane. The genome is condensed.

Physicochemical and Physical Properties

Virions are sensitive to treatment with or inactivated by ether, non-ionic detergents (Brij-58, Triton-X, and Nonidet P-40), chloroform, heat. The infectivity is not affected by irradiation (virions can be reactivated after UV irradiation in host cells by excision and SOS DNA repair systems, decreased when deproteinized with proteases.

Nucleic Acid

The genome is not segmented and contains a single molecule of circular, supercoiled, double-stranded DNA. The complete genome is 12000 nucleotides long. The DNA is sequenced, but only an estimate is available, complete sequence is 12000 nucleotides long. The genome has a guanine + cytosine content of 32 %.

GenBank records for nucleotide sequences; complete genome sequences.

Proteins

The viral genome encodes structural proteins. Virions consist of at least 4 structural protein(s) located in the envelope.

Lipids

Lipids are present and located in the envelope. The composition of viral lipids and host cell membranes are similar. The lipids are of host origin and are derived from host cell membranes (and variation of host cell fatty acid composition leads to virions with corresponding fatty acid composition variations). Lipids in the viral membrane have a bilayer structure.

Carbohydrates

Carbohydrates have not been reported.

Genome Organization and Replication

Infection and Replication: Infection involves a noncytocidal productive infectious cycle that is followed by a lysogenic cycle in each infected cell. Prophage DNA must be activated (derepressed) before replication. After initial replication of viral genome the infecting nucleic acid may become latent within the host; complete. Lysogeny involves integration into the host chromosome at a unique site. The host chromosome; due to a repressor, lysogens are resistant to superinfection by homologous virus. Lysogens are not resistant to superinfection by heterologous virus (apparently due to a repressor). Latent infection can be induced by UV-irradiation, or mitomycin C.

Transcription: The virus codes for at least 15 ORF(s). The viral genome is transcribed from the viral sense strand.

At least 11 viral mRNA(s) is/are transcribed with an overlap; viral mRNA(s) is/are transcribed from at least 8 promoter(s, viral mRNA(s) is/are transcribed in a unidirectional coding arrangement.

Release: Infected cells produce prophages. Host cells survive as lysogens. Noncytocidal infection involves progeny virus release. Virus is released from host cell by budding through the cell membrane.

Biological Properties

Natural Host

Domain
Viral hosts belong to the Domain Bacteria.

Domain Bacteria
Phylum Firmicutes.

Host Classification Virus infects Division Tenericutes; Class Mollicutes; Family Acholeplasmataceae; Genus Acholeplasma; Species laidlawii.

Signs and Symptoms

Virus found in — Acholeplasma laidlawii, A. modicum and A. oculi strains.

Taxonomic Structure of the Family

00.053.0.01. Plasmavirus.

Data Sources and Contributions

The description has been compiled from data in the ICTV Report presented by Maniloff J.

References

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

PubMed References.

Images

Taxon images: • EM from Jack Maniloff, University of Rochester, New York.



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DELTA - DEscription Language for TAxonomy developed by Dr Mike Dallwitz, Toni Paine and Eric Zurcher, CSIRO Entomology, Canberra, Australia. ICTVdB - The Universal Virus Database, developed for the International Committee on Taxonomy of Viruses by Dr Cornelia Büchen-Osmond is written in DELTA. The virus descriptions in ICTVdB are coded by, or using data from experts in the field of virology or members ICTV. The character list is the underlying code. All virus descriptions are based on the character list and natural language translations are automatically generated and formatted for display on the Web from the descriptions in DELTA-format. The description has been generated automatically from DELTA files. DELTA - DEscription Language for TAxonomy developed by Dr Mike Dallwitz, Toni Paine and Eric Zurcher, CSIRO Entomology, Canberra, Australia.

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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