Phaeovirus

Phaeovirus is a genus of viruses, in the family Phycodnaviridae. Algae serve as natural hosts. There are three species in this genus.^[1][2]

Phaeovirus
Virus classification
(unranked):	Virus
Realm:	Varidnaviria
Kingdom:	Bamfordvirae
Phylum:	Nucleocytoviricota
Class:	Megaviricetes
Order:	Algavirales
Family:	Phycodnaviridae
Genus:	Phaeovirus

Taxonomy

The genus contains the following species, listed by scientific name and followed by the exemplar virus of the species:^[2]

• Phaeovirus feldmanniae, Ectocarpus siliculosus virus 1
• Phaeovirus irregularis, Feldmannia irregularis virus a
• Phaeovirus unasiliculosus, Feldmannia species virus

Structure

Schematic drawing of a typical Phycodnaviridae virion (cross section and side view)

Viruses in Phaeovirus are enveloped, with icosahedral and round geometries, and T=169 symmetry. The diameter is around 120-150 nm. Genomes are linear, around 150-350kb in length.^[1]

Genus	Structure	Symmetry	Capsid	Genomic arrangement	Genomic segmentation
Phaeovirus	Icosahedral	T=169	Enveloped	Linear	Monopartite

Life cycle

Viral replication is nucleo-cytoplasmic, and is lysogenic. Replication follows the DNA strand displacement model. DNA-templated transcription is the method of transcription. The virus exits the host cell by lysis via lytic phospholipids. Alga serve as the natural host. Transmission routes are passive diffusion.^[1]

Genus	Host details	Tissue tropism	Entry details	Release details	Replication site	Assembly site	Transmission
Phaeovirus	Alga	None	Cell receptor endocytosis	Lysis	Nucleus	Cytoplasm	Passive diffusion