Description of Partitiviridae

adapted from ICTVdb

Virion Properties

Morphology

Virions consist of a capsid. Virus capsid is not enveloped, round with icosahedral symmetry. The nucleocapsid is isometric and has a diameter of 30-35 nm. The capsid consists of 12 capsomers. 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.

Nucleic Acid

The Mr of the genome constitutes 9% of the virion by weight, or 16% of the virion by weight, or 25% of the virion by weight. The genome is segmented; multipartite and segments are distributed over several particles of varying size, depending on the length of the genome enclosed.

Description of Partitiviridae

adapted from ICTVdb

Virion Properties

Morphology

Virions consist of a capsid. Virus capsid is not enveloped, round with icosahedral symmetry. The nucleocapsid is isometric and has a diameter of 30-35 nm. The capsid consists of 12 capsomers. 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.

Nucleic Acid

The Mr of the genome constitutes 9% of the virion by weight, or 16% of the virion by weight, or 25% of the virion by weight. The genome is segmented; multipartite and segments are distributed over several particles of varying size, depending on the length of the genome enclosed. The genome consists of two segments of, or three segments of, or four segments of linear, double -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, or satellite RNA. The complete genome is 3000-10000 nucleotides long. Genome is sequenced, but only an estimate is available, complete sequence is 1300-2200 nucleotides long.   Is sequenced, complete sequence is about 1500-2200 nucleotides long, is sequenced, but only an estimate is given, complete sequence is 600-1500 nucleotides long (defective or subgenomic RNA). The multipartite genome is divided among more than one type of particle and the segments are distributed between at least 2-7 different types of particles (containing either a single molecule of dsRNA (L1, L2), or single molecule of ssRNA corresponding to the plus-strand (M1; M2) and a single molecule of dsRNA with ssRNA tails (H), or one molecule of dsRNA and ssRNA (H), or two molecules of dsRNA (P)). Populations of mature viruses contain particles with a single molecule of dsRNA (L1, L2), or a single molecule of ssRNA corresponding to the plus-strand (M1; M2) and a single molecule of dsRNA with ssRNA tails (H), or one molecule each of dsRNA and ssRNA (H), or two molecules of dsRNA (P). Each virion contains defective interfering copies.

Proteins

The viral genome encodes structural proteins. Virions consist of 1 structural protein(s).

Lipids

Lipids are not reported.