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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.

00.010. Bromoviridae

Cite this publication as: ICTVdB Management (2006). 00.010. Bromoviridae. 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 plant virus at the family level.

ICTVdB Virus Code: 00.010. Virus accession number: 00010FAM. Obsolete virus code: 10.; superceded accession number: 10000000.
NCBI Taxon Identifier NCBI Taxonomy ID: 39740.

Virion Properties

Morphology

Virions consist of a capsid. Virus capsid is not enveloped. Capsid is round to elongated with icosahedral symmetry (T=3 or T=1 in Alfamovirus Ta particles). The capsid is isometric to bacilliform and has a diameter of 26-35 nm. The capsid shells of virions are composed of a single layer. The capsid surface structure does not reveal a regular pattern with distinctive features. Virus preparations contain more than one particle component. Virions consist of several nucleocapsids, capsids and segments have different lengths, but constant diameter. The nucleocapsid is segmented, but only one species is recovered in preparations.

Electron micrograph of Bromoviridae by R.G. Milne. (1) Alfamovirus, (2) Ilarvirus, (3) Bromovirus, (4) Cucumovirus.

Nucleic Acid

The Mr of the genome constitutes 14-25% of the virion by weight. The genome is monomeric; segmented; tripartite, segements are distribute among 3 particle types of different size; consists of four segments of linear positive-sense, single-stranded RNA. 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, that is mRNA derived from genomic RNA-3. The complete genome is 7900-8910 nucleotides long. The RNA-1 is fully sequenced, complete sequence is 3200-3644 nucleotides long. RNA-2 is sequenced, but only an estimate is available, complete sequence is 2600-3050 nucleotides long. RNA-3 is sequenced, but only an estimate is given, complete sequence is 2100-2216 nucleotides long. RNA-4 is the encapsidated mRNA has been fully sequenced, complete sequence is 800-1000 nucleotides long. Subgenomic RNA-4 is an mRNA derived from RNA-3 negative strand template. Nucleotide sequences at the 3'-terminus are similar. The 5'-end of the genome has a methylated nucleotide cap; cap sequence type is m7G5'ppp5 ('Gp..). The 3'-terminus has conserved nucleotide sequences; sequence has of most viruses 150-200 nucleotides in length; in all RNA species. The 3'-terminus has no poly (A) tract. The 3'-terminus has a tRNA-like structure that cannot be aminoacylated, or can be aminoacylated (in the genera Cucumovirus and Bromovirus). The multipartite genome is divided among more than one type of particle and the segments are distributed between 3-7 different types of particles.

GenBank records for nucleotide sequences; complete genome sequences.

Proteins

The viral genome encodes structural proteins and non-structural proteins located in the capsid.

Structural Proteins: Capsid protein (CP) encoded by sgRNA-4 is encapsidated in all but the genus Oleavirus. Capsid protein has a molecular mass of 19800-26200 Da; is involved in viral encapsidation and involved in protein movement.

Lipids

Lipids are absent.

Genome Organization and Replication

By itself, genomic nucleic acid is not infectious, or infectious.

Transcription: Sub-genomic RNA is present in infected cells; encoding the coat protein.

Biological Properties

Natural Host

Domain
Viral hosts belong to the Domain Eucarya.

Domain Eucarya
Kingdom Plantae.

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

Taxonomic Structure of the Family

00.010.0.01. Alfamovirus
00.010.0.02. Ilarvirus
00.010.0.03. Bromovirus
00.010.0.04. Cucumovirus
00.010.0.05. Oleavirus.

Data Sources and Contributions

The description has been compiled from data in the ICTV Report presented by Rybicki EP.

References

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

PubMed References.

Images

Taxon images: • EM by Robert G. Milne. • EM by Thorben Lundsgaard. • EM by Robert G. Milne. • EM by Robert G. Milne. • EM by Robert G. Milne. • EM by Robert G. Milne. • EM by Robert G. Milne. • EM by Robert G. Milne.

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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