Notes on Genus: Polemovirus
Type member: Poinsettia latent virus
This genus was created in 2007 and presently contains a single species. The name reflects the fact that it has a close relationship to members of the genus Polerovirus
within the first three quarters of its genome but to members of the genus Sobemovirus
in the last quarter. The virus is widespread, but symptomless in its host plant and its natural method of transmission is unknown.
Virions are isometric (icosahedral), not enveloped, 34 nm in diameter.
Monopartite, linear, single stranded, positive sense RNA c.
4600 nucleotides long. The 3' terminus has neither a poly (A) tract nor a tRNA-like structure. The 5' terminus probably has a genome-linked protein (VPg).
Genus Genomic Organization
There are a total of four potential ORFs. The three at the 5'-end have sequence homology to members of the genus Polerovirus
. The fourth (coat protein) ORF resembles that of members of the genus Sobemovirus
Type Member Genomic Organization
Four open reading frames have been identified :
|1. ||30 kDa ||unknown function, similar to polerovirus ORF0|
|2. ||72 kDa ||Replication protein|
|3. ||61 kDa||Polymerase. Probably expressed as a larger protein entered earlier by frameshift from ORF2|
|4. ||33 kDa ||
Coat protein expressed from a subgenomic RNA|