Description of Geminiviridae
adapted from
ICTVdb
Virion Properties
Morphology
Virions consist of a
capsid. Virus capsid is not enveloped. Capsid is elongated and
exhibits icosahedral symmetry. The capsid is geminate and has a
diameter of 18-20 nm. The capsid consists of 22 capsomers. With a
length of 30 nm.
Physicochemical and Physical Properties
Virions have a buoyant density in
CsCl of 1.34-1.35 g cm
-3.
Nucleic Acid
The genome is not segmented and contains a single
molecule of, or segmented; consists of two segments of (similar,)
circular, ambisense, single-stranded DNA ; that forms a closed
circle. The complete genome is 2500-3000 nucleotides long, or
4800-5600 nucleotides long. The multipartite genome is divided
among different particles, each segment encapsidated separately
and the segments are distributed between 2 different types of
particles.
Proteins
The viral genome encodes structural
proteins and non-structural proteins.
Lipids
Lipids are not reported.
Genome Organization and Replication
By itself, genomic nucleic acid is infectious (in species
with 2 DNAs, both required for full systemic infection).