This category comprises the satellites with ssRNA genomes encapsidated in satellite-encoded protein structures. Several types are known. In all cases, the satellite virus particles are antigenically, and usually morphologically, distinct from those of the helper virus.
Two subgroups of satellite viruses are distinguished: Chronic bee-paralysis virus associated satellite virus-like and Tobacco necrosis satellite virus-like.
Subgroup 1: Chronic Bee-Paralysis Associated Satellite Virus-Like
Satellite virus particles are found in bees infected with the helper, Chronic bee-paralysis virus (CBPV). Particles are about 12 nm in diameter and serologically unrelated to those of CBPV. Satellite RNA is also found encapsidated in CBPV coat protein. The RNA consists of 3 species, about 1 kb in size. These are distinct from CBPV RNA although they contain some T1 oligonucleotides that appear to be common to CBPV RNA and to satellite RNA. The satellite interferes with CBPV replication. See Overton, Buck, Bailey and Ball, 1982.
The satellite name is:
Chronic bee-paralysis satellite virus
Subgroup 2: Tobacco Necrosis Satellite Virus-Like
Satellite virus particles are found in plant hosts in association with taxonomically diverse helper viruses. Particles are isometric and about 17 nm in diameter. They consist of 60 copies of a single protein (Mr = 17 to 24 103) and one molecule of RNA. The satellite RNA contains an ORF that encodes satellite CP; some satellite RNAs contain a second ORF. See Ban, Larson and McPherson, 1995; Berger, Shiel and Gunasinghe, 1994; Danthinne, Seurinck, van Montague, Pleij and van Emmelo, 1991; Forde, 1993; Masuta, Zidema, Hunter, Heaton, Sophee and Jackson, 1987; Mirkov, Mathews, du Plessis and Dodds, 1989; Turina, Maruoka, Monis, Jackson and Scholthof, 1998 and Zhang, Zitter and Palukaitis, 1991.
The satellite names are:
Maize white line mosaic satellite virus
Panicum mosaic satellite virus
Tobacco mosaic satellite virus
Tobacco necrosis satellite virus
Cereal yellow dwarf - RPV satellite virus
|
|