Notes on Genus: Zeavirus
Type member: Maize necrotic streak virus
This is one of the genera in the family Tombusviridae
. All the genera are morphologically similar, with icosahedral particles and small, (usually) monopartite ss RNA genomes. The genome organization resembles that of members of the genus Tombusvirus
but the genome of 4.1kb is smaller and the coat protein is also smaller and lacks the protuding domain (thus resembling necroviruses).
Virions isometric (icosahedral), 28nm in diameter. 32 capsomeres per nucleocapsid.
Monopartite, linear, single stranded positive sense RNA about 4100 nucleotides long. 3' terminus has no poly(A) tract.
Genus Genomic Organization
The RNA is translated into five putative products, including a polymerase, a 27kDa coat protein translated from the larger of two subgenomic RNAs and two other products translated from the smaller subgenomic.
Type Member Genomic Organization
The RNA is translated into five putative products:
|1. ||30 kDa||Replication protein|
|2. || 89 kDa||Polymerase readthrough|
|3. ||27 kDa||Coat protein, translated from subgenomic RNA1 (1607 nt) |
|4. ||21 kDa||Movement protein, translated from subgenomic RNA2 (781 nt) |
|5. ||19 kDa||silencing supressor, translated from subgenomic RNA2|