Notes on Genus: Endornavirus
Type member: Vicia faba endornavirus
The genus Endornavirus
is currently the only member of the family Endornaviridae
. It contains entities previously considered as large (>10kb) endo
genous double-stranded RNA
s. They can replicate independently of their host and can be regarded as RNA plasmids but they have not been shown to be transmitted except, presumably, through seed. There are no distinct particles and sequences can be often be detected in apparently healthy plants. They encode a single large ORF that has similarities to the replication proteins of the alpha-like supergroup of (single-stranded) RNA viruses.
There are no virions.
Monopartite, linear, double stranded RNA >10 kb in size.
Genus Genomic Organization
There is a single ORF encoding a replication protein that has conserved sequence motifs characteristic of an RNA-dependent RNA polymerase and an RNA helicase.
Type Member Genomic Organization
The sequence (17,635 nt) encodes a single, large, replication protein of 655 kDa.