Nudiviruses are large and rod-shaped viruses with a circular, double stranded DNA genome. They are related to the baculoviruses and like these infect arthropods, particularly insects They share 20 core genes with baculoviruses. However, they are currently no longer regarded as members of the family Baculoviridae and are considered to be a sister group of these.
Taxonomy
In 2007, the genus Nudivirus has been proposed to include viruses similar to the Oryctes rhinoceros virus Currently, the following viruses are considered to be members of the genus Nudivirus:
Gryllus bimaculatus nudivirus (infecting the black cricket)
Helicoverpa zea nudivirus 1 (infecting the cotton bollworm)
Helicoverpa zea nudivirus 2 (infecting the cotton bollworm)
Penaeus monodon nudivirus (infecting a shrimp)
Oryctes rhinoceros nudivirus (infecting the rhinoceros beetle)
Properties
This genus is characterized by rod-shaped and enveloped nucleocapsids and its members replicate in the nucleus of infected host cells. However, the viruses are not embedded in inclusion bodies (crystallized proteins) like the baculoviruses. All sequenced nudiviruses have 33 open reading frames in common, 20 of them are homologous to baculovirus core genes involved in RNA transcription, DNA replication, virion structural components and other functions. Nudiviruses and baculoviruses appear to be derived from a common ancestor and evolutionarily related to other large DNA viruses
Relation to polydnaviruses in parasitic wasps
Parasitic wasps contain particles of polydnaviruses from portions of a nudivirus which have become part of the wasp genome. The genes help form particles like virions which are injected into the host larvae of the wasp and suppress a defensive response. The wasp eggs can then develop and parasitize the larva.
Taxonomy
In 2007, the genus Nudivirus has been proposed to include viruses similar to the Oryctes rhinoceros virus Currently, the following viruses are considered to be members of the genus Nudivirus:
Gryllus bimaculatus nudivirus (infecting the black cricket)
Helicoverpa zea nudivirus 1 (infecting the cotton bollworm)
Helicoverpa zea nudivirus 2 (infecting the cotton bollworm)
Penaeus monodon nudivirus (infecting a shrimp)
Oryctes rhinoceros nudivirus (infecting the rhinoceros beetle)
Properties
This genus is characterized by rod-shaped and enveloped nucleocapsids and its members replicate in the nucleus of infected host cells. However, the viruses are not embedded in inclusion bodies (crystallized proteins) like the baculoviruses. All sequenced nudiviruses have 33 open reading frames in common, 20 of them are homologous to baculovirus core genes involved in RNA transcription, DNA replication, virion structural components and other functions. Nudiviruses and baculoviruses appear to be derived from a common ancestor and evolutionarily related to other large DNA viruses
Relation to polydnaviruses in parasitic wasps
Parasitic wasps contain particles of polydnaviruses from portions of a nudivirus which have become part of the wasp genome. The genes help form particles like virions which are injected into the host larvae of the wasp and suppress a defensive response. The wasp eggs can then develop and parasitize the larva.
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