Notes on Genus: Becurtovirus
Type member: Beet curly top Iran virus
This is one of 7 genera in the family Geminiviridae
. Its members have biological properties resembling those of the genus Curtovirus
but the genome organization with a spliced replication initiator protein resembles that of members of the genus Mastrevirus
. The origin of replication sequence is the unusual TAAGATTCC.
Virions are geminate (twinned) icosahedra, not enveloped, 38 nm long and 22 nm in diameter. 22 capsomeres per nucleocapsid.
Monopartite, closed circular, single stranded DNA, about 2850 nucleotides long.
Genus Genomic Organization
There are three open reading frames (ORFs) in the positive (virion) sense and two in the negative (complementary) sense.
Type Member Genomic Organization
|V1||+||29 kDa ||Coat protein|
|V2||+||14 kDa ||ss/dsDNA regulator|
|V3||+||10 kDa ||Movement protein|
|C1||-||35 kDa ||Replication protein A|
|C2||-||12 kDa ||Replication protein B|