Genus: Sadwavirus

Genus: Sadwavirus

Distinguishing features

The single member of the genus has a bipartite genome, two capsid proteins (CPs), is transmitted by an unknown vector; phylogenetic analysis places it as a distinct lineage of the family. 

Virion

See discussion under family description.

Genome organisation and replication

Similar to comoviruses, sadwaviruses have two CPs, one large and one small. The genome of sadwaviruses is bipartite and the genomic organization is similar to that of comoviruses. The proteinase of sadwaviruses is distinct from that of other viruses in the family in that it does not have a conserved His or Leu in the active site. In addition, the cleavage sites recognized by sadwavirus proteinases are unique with an A or a T at the -1 position (Table 3.Secoviridae). In contrast to comoviruses, there is no evidence that two overlapping polyproteins are encoded by RNA-2. Similar to some nepoviruses, extensive sequence identity between RNA-1 and RNA-2 are found in the 5ʹ UTRs as well as in the 5ʹ-end of the putative coding region.

Biology

See discussion under family description.

Species demarcation criteria

This is only a single species genus.

Member species

Exemplar isolate of the species
SpeciesVirus nameIsolateAccession numberRefSeq numberAvailable sequenceVirus Abbrev.
Chocolate lily virus Achocolate lily virus ACLVA-KP2RNA-1: JN052073;
RNA-2: JN052074
All
RNA-1: NC_016443;
RNA-2: NC_016444
All
Complete genomeCLVA
Dioscorea mosaic associated virusDioscorea mosaic associated virusDMaV-goianaRNA-1: KU215538;
RNA-2: KU215539
All
RNA-1: NC_031766;
RNA-2: NC_031763
All
Complete genomeDMaV
Sadwavirus PSVApineapple secovirus AMN809923;
MN809924
All
Complete genomePSVA
Satsuma dwarf virussatsuma dwarf virusSDV-S58RNA-1: AB009958;
RNA-2: AB009959
All
RNA-1: NC_003785;
RNA-2: NC_003786
All
Complete genomeSDV
Black raspberry necrosis virusblack raspberry necrosis virusBRNV-AlythRNA-1: DQ344639;
RNA-2: DQ344640
All
RNA-1: NC_008182;
RNA-2: NC_008183
All
Complete genomeBRNV
Sadwavirus LSV1lettuce secovirus 1KX925437;
KX925438
All
Partial genomeLSV1
Strawberry mottle virusstrawberry mottle virusSMoV-NsPer3RNA-1: AJ311875;
RNA-2: AJ311876
All
RNA-1: NC_003445;
RNA-2: NC_003446
All
Complete genomeSMoV

Virus names, the choice of exemplar isolates, and virus abbreviations, are not official ICTV designations.