Sobemovirus
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. Chilo iridescent virus. Fig. 1 Ultrathin section of intracellular mature virus particles. Length of bar (nm): 100 (Courtesy of Hans R. Gelderblom)
Virion Morphology:
Icosahedral
Envelope:
No
Diameter (nm):
120–145
Length (nm):
–
Structural components:
Core, internal lipid membrane, capsid
Buoyant density (g/mL):
1.26–1.33
Buoyant density method: Lipid composition: Additional information:
A fringe of short fibrils (2.5 nm length) attached to the outer surface of the capsid reported in some isolates
C. Tidona, G. Darai (eds.), The Springer Index of Viruses, DOI 10.1007/978-0-387-95919-1, # Springer Science+Business Media, LLC 2011
786
Iridovirus
Genome Nucleic acid:
DNA
Strandedness:
Double-stranded
Polarity:
–
Configuration:
Linear
Segment organization: Segment no. 1 (kb): One segment(s): G + C content (%):
28.7–31.7
mRNA transcripts:
?
140–209 140–209 (kb) total (calculated)
Open reading frames: Additional information: Genome is circularly permuted and terminally redundant (12%); one isolate of IIV-1 reported to comprise two genomic components
Replication Entry mechanism:
Viropexis via pinocytosis
Site of transcription:
Nucleus
Transcriptase:
Host RNA polymerase I and virus-encoded DNA-dependent RNA polymerase
Site of genome replication: Nucleus Replicase:
Probably by virus-encoded DNA-dependent DNA polymerase
Replication intermediate:
Unknown
Site of virion assembly:
Virogenic stroma in cytoplasm
Egress mechanism:
Exocytosis through extrusion of particles in vacuoles, budding through cell membrane, cell lysis
Additional information:
Particles form paracrystalline arrays in host cell cytoplasm
History Year of event Event
References
1954
First iridescent virus (IIV-1) infection reported in Tipula paludosa (Diptera) larvae in UK
Xeros N (1954) Nature 174:562–563
1957
Iridescence phenomenon shown to be due to crystalline arrangement of particles in host cells
Williams RC, Smith KM (1957) Nature 179:119–120
1958
Icosahedral particle structure demonstrated by double shadowing
Williams RC, Smith KM (1958) Biochim biophys Acta 28:464–469
1961
IIV-1 shown to have extended host range (by injection) compared to other insect viruses
Smith KM et al (1961) Virology 13:233–241
1963
A second iridescent virus (IIV-2) isolated from Sericesthis pruinosa (Coleoptera) in Australia
Steinhaus EA, Leutenegger R (1963) J Insect Pathol 5:266–270
1964
IIV-2 shown to be remarkably infectious by injection
Day MF, Mercer EH (1964) Aust J Biol Sci 17:892–902
Iridovirus
Year of event Event
References
1968
Iridescent virus DNA compared with Frog Virus 3 and Poxviruses
Bellett AJD, Fenner F (1968) J Virol 2:1374–1380
1969
Capsid shown to consist of protein subunits arranged in tri- and pentasymmetrons
Wrigley NG (1969) J Gen Virol 5:123–134
1970
System of nomenclature proposed to cope with growing number of reports of iridescent virus infections
Tinsley TW, Kelly DC (1970) J Invertebr Pathol 12:66–68
1971
Complex particle ultrastructure revealed in detailed EM stu
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