Non enveloped, single-shelled T=13 icosahedral symmetry capsid of about 70 nm in diameter, composed of 260 trimers of VP2 that form spikes projecting radially from the capsid. The peptides derived from pre-VP2 C-terminal cleavages remain associated within virion. VP3 forms a ribonucleoprotein complex with the genomic RNA. Minor amounts of VP1 are also incorporated in the virion.



Segmented linear dsRNA genome: 2 segments (A,B) encode for 6 proteins. VP1 is found in a free form and covalently attached at the 5' genomic RNA end (VPg). Segments size is about 2.7-3.4 kb. Genome total size is about 6 kb.


Genomic segment A encodes for a structural polyprotein which is matured in cis by VP4. It may also encode an alternative ORF translated by leaky scanning (VP5).
Genomic segment B encodes for VP1.



  1. Virus penetrates into the cytoplasm.
  2. Transcription of the dsRNA genome by viral polymerase occurs inside the virion, so that dsRNA is never exposed to the cytoplasm. This plus-strand transcript is used as template for translation.
  3. (+)RNAs are encapsidated in virion particle, inside which they are transcribed to give RNA (-) molecules with which they become base-paired to produce dsRNA genomes.
  4. Mature virions are released by budding.

Matching UniProtKB/Swiss-Prot entries

3 entries grouped by protein (browse by keywords)

1 entry

Structural polyprotein (PP)

Blotched snakehead virus (BSNV) (Channa lucius virus) reference strain

1 entry

RNA-directed RNA polymerase (RDRP) (EC (Protein VP1)

Blotched snakehead virus (BSNV) (Channa lucius virus) reference strain

1 entry

Protein VP5

Blotched snakehead virus (BSNV) (Channa lucius virus) reference strain