Family: Endornaviridae
Genus: Betaendornavirus
Distinguishing features
Betaendornaviruses infect ascomycete fungi. They are characterized by having shorter genomes (<10.7 kb) than alphaendornaviruses, lack of a glucosyltransferase domain which is present in the majority of alphaendornaviruses, but all encode a methyltransferase (Figure 1. Betaendornavirus). Furthermore, studied members lack a site-specific nick near the 5′-end of the positive-sense strand.
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Figure 1. Betaendornavirus. Genome organization of Sclerotinia sclerotiorum endornavirus isolate 11691, the exemplar isolate of the type species of genus Betaendornavirus. Numbers indicate genome nucleotide positions. Several functional domains present in the virus-encoded polyprotein are depicted by colored boxes |
Virion
See discussion under family description.
Genome organization and replication
See discussion under family description.
Biology
See discussion under family description.
Species demarcation criteria
Members of different species have an overall nucleotide sequence identity below 75%.