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.
00.006. Baculoviridae
Cite this publication as: ICTVdB Management (2006).
00.006. Baculoviridae. 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/
This is a description of an
invertebrate virus at the family level.
ICTVdB Virus Code: 00.006. Virus accession number: 00006FAM.
Obsolete virus code: 06.; superceded accession number: 06000000.
NCBI Taxon Identifier NCBI Taxonomy ID:
10442.
Virions consist of an envelope and a nucleocapsid. During
their life cycle, virions have an extracellular phase; can occur in two
phenotypes. The infection is initiated by extracellular virions in the gut
epithelium (phenotype I) and phenotype II virions generated when the
nucleocapsids bud through the plasma membrane at the surface of infected cells
(termed budded virions or BV). Virus may be sequestered within inclusion bodies
that are occluded by protein bodies, or occluded by a crystalline
protein matrix, or not occluded and typically contain one nucleocapsid
composed of a single viral protein, polyhedrin, or granulin. Virus initiating
infection is occluded by a crystalline protein matrix of polyhedral shape, or of
ovicylindrical shape. Each occlusion body measures 0.13-15
μm and contains one virion, or several virions;
virions in occlusions consist of a single nucleocapsid (S), or multiple
nucleocapsids (M) within a single viral envelope. Virus capsid is enveloped.
Virions are rod-shaped. A cell-associated virus, second phenotype, is
generated when the nucleocapsid buds through the plasma membrane at the surface
of infected cells. BVs typically contain a single nucleocapsid, or is needed if
infection is not restricted to the gut epithelium cells. The secondary infected
tissue produces occluded virions (ODV). Intracellular virions are enveloped
with a loose fitting membrane. The envelope surrounds one nucleocapsid,
or two nucleocapsids to several nucleocapsids; has terminal surface projections.
Surface projections are peplomers. Surface projections are
composed of one type of protein; projection proteins are glycosylated.
Capsid/nucleocapsid is elongated with helical
symmetry.
The nucleocapsid is rod-shaped with a length with a length of
200-450 nm and a width of 30-100 nm. Capsid electron dense.
The Mr
of the genome constitutes 8-15% of the virion by weight. The genome is not
segmented and contains a single molecule of circular, supercoiled,
double-stranded DNA. The complete genome is 90000-230000
nucleotides long. Genome is sequenced, but only an estimate is available,
complete sequence is 80000-180000 nucleotides long. The genome has
a guanine + cytosine content of very variable and ranges from 28-59 %.
GenBank records for
nucleotide sequences;
complete genome sequences.
Particles
are made up of probably 12-20 proteins (however, genomic analyses suggest
that 100-200 proteins may be encoded).
The viral genome encodes structural proteins and non-structural proteins
located
in the envelope and capsid (only BV), envelope, capsid, and
occlusion bodies (ODV).
Lipids are
present and located in the envelope (of ODV and BV).
Natural Host
Domain
Viral hosts belong to the Domain
Eucarya.
Domain Eucarya
Kingdom Animalia.
Kingdom Animalia
Phylum Arthropoda.
00.006.0.01.
Nucleopolyhedrovirus
00.006.0.02.
Granulovirus.
Data Sources and
Contributions
The
following generic references are cited in the most recent ICTV Report.
PubMed References.
Taxonomic Proposals and Changes
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