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The strains in this genus form a distinct clade within the family Caliciviridae (Figure 4.Caliciviridae). ORF1 of minovirus encodes a polyprotein that shares 21% amino acid identity with caliciviruses in the genus Salovirus, which also have been detected in fish species, followed by 11% to 14% amino acid identity with mammalian caliciviruses.
See discussion under family description.
The genome of minovirus is 7.4 kb and contains two ORFs (ORF1 and ORF2). ORF1 encodes a 2,114-aa polyprotein. Amino acid motif analysis of ORF1 indicates the presence of conserved calicivirus protein motifs corresponding to both non-structural proteins and the major capsid protein (VP1). The protein encoded by ORF2 of minovirus has a calculated molecular weight of 12.8 kDa.
During regulatory sampling of fathead minnows (Pimephales promelas), a novel calicivirus was isolated from homogenates of kidney and spleen that were inoculated into bluegill fry (BF-2) cells (Mor et al., 2017).
Not defined as there is only one species in the genus.
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