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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.

00.077.0.03. Maculavirus

Cite this publication as: ICTVdB Management (2006). 00.077.0.03. Maculavirus. 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 a plant virus at the genus level.

ICTVdB Virus Code: 00.077.0.03. Virus accession number: 077003GE.
NCBI Taxon Identifier NCBI Taxonomy ID: 249185.

Name, Synonyms and Lineage

Virus is of the family 00.077. Tymoviridae.

Virion Properties

Morphology

Virions consist of a capsid. Virus capsid is not enveloped, round with icosahedral symmetry. The isometric capsid has a diameter of 30 nm. Capsids appear round. The capsid surface structure reveals a regular pattern with distinctive features suggestive of coat protein subunit arrangement in hexamers and pentatmers. The capsomer arrangement is clearly visible. Virus preparations contain more than one particle component.

Incomplete particles are common. They are devoid of nucleic acid characterized by capsids with dark centers in negative stain preparations.

Physicochemical and Physical Properties

There are 2 sedimenting component(s) found in purified preparations (T and B).

Nucleic Acid

The Mr of the genome constitutes 35% of the virion by weight. The genome is monopartite. Only one particle size of linear, positive-sense, single-stranded RNA is recovered. Minor species of non-genomic nucleic acid are also found in virions. The encapsidated nucleic acid is mainly of genomic origin, but virions may also contain subgenomic RNA; virions may contain two subgenomic nucleic acid species. The complete genome is 7500-7600 nucleotides long. The RNA is sequenced, complete sequence is about 7500-7600 nucleotides long and encodes 4 putative open reading frames. The genome has a base ratio of ca. 50 % cytosine. The 5'-terminus has a long non-coding region. The 3'-terminus has a long non-coding region; no subgenomic promoter region. The 3'-terminus has a poly (A) tract. The 3'-terminus has no tRNA-like structure.

GenBank records for nucleotide sequences; complete genome sequences.

Proteins

Proteins constitute about 65% of the particle weight; have been characterized and functions are assigned to them. Particles are made up of 4 proteins.

The viral genome encodes structural proteins and non-structural proteins. Virions consist of 1 structural protein(s) located in the capsid.

Structural Proteins: Capsid protein CP has a molecular mass of 28000 Da; has been sequenced and a function assigned; is the coat protein.

Non-Structural Proteins: Virus-coded non-structural proteins have been identified by sequence analysis and 2 non-structural protein(s) are found.

Biological Properties

Natural Host

Domain
Viral hosts belong to the Domain Eucarya.

Domain Eucarya
Kingdom Plantae.

Kingdom Plantae
Phylum Magnoliophyta (Angiosperms, Class Magnoliopsida (Dicotyledonae).

Class Magnoliopsida (Dicotyledonae)
Subclass ROSIDAE; Order Rhamnales;
Family Vitidaceae. Virus found in Vitis vinifera.

General Symptoms in Plants Virus affects the vascular system and photosynthetic system. Symptoms are expressed in the leaf.

Transmission and Vector Relationships

Virus is not transmitted by a known vector. Virus is not transmitted by mechanical inoculation.

Experimental Hosts and Symptoms

Under experimental conditions susceptibility to infection by virus is found in one family. Susceptible host species are found in the Family Vitidaceae. The following species were susceptible to experimental virus infection: Vitis vinifera.

Histopathology: Virus can be best detected in phloem only. Virions are found in the cytoplasm (in structures derived from deranged mitochondria that undego peripherical vesiculation following invagination of both lamellae, the organelle's limiting membrane (Castellano and Martelli (1984), Journal of Ultrastructural Research 89, 56-64)). Primary histological changes include inclusions.

Cytopathology: Inclusions are present in infected cells. Inclusion bodies are of diagnostic value. Inclusion bodies in the host cell are found in the cytoplasm. Cytoplasmic inclusions are multivesiculated bodies. Cytoplasmic inclusion bodies are membrane associated flask-shaped vesicles. Cytoplasmic inclusion bodies are associated with the mitochondria. Structures are probably involved with viral RNA replication.

Taxonomic Structure of the Genus

Type species 00.077.0.03.001. Grapevine fleck virus .

Species in the Genus

List of Species in the Genus.

References

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

PubMed References.

Taxonomic Proposals and Changes

A taxonomic proposal has been submitted to the ICTV by the Plant Virus Subcommittee at the meeting in Washington, DC, April 2001, to create a new taxon (in the newly created family Tymoviridae). The proposal has been approved by postal ballot following discussions at the meeting of the Executive Committee in Houston, March 2002, the taxon has been designated as Genus (in the Family Tymoviridae).



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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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