Notes on Genus: Gyrovirus
Type member: Chicken anemia virus
The genus Gyrovirus
is one of two genera in the family Circoviridae
and currently contains a single virus with a genome larger than 2.2kb that is translated from ORFs exclusively in the virion (+) sense.
Virions isometric (icosahedral), not enveloped, 19-27 nm in diameter.
Monopartite circular single-stranded DNA of about 2.3 kb. The origin of replication contains a nonanucleotide sequence TAGTATTAC at the apex of a stem loop.
Genus Genomic Organization
There are three overlapping ORFs in the virion (positive) sense.
Type Member Genomic Organization
There are three overlapping ORFs in the virion (positive) sense :
- VP2: 24 kDa, unknown protein
- VP3: 13 kDa, unknown protein
- VP1: 52 kDa, Coat protein