Aquabirnavirus (taxid:39750)



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 5 proteins and 3 to 4 small peptides. VP1 is found in a free form and covalently attached at the 5' genomic RNA end (VPg). Segments size is about 2.7-3 kb. Genome total size is about 6 kb.


Genomic segment A encodes for a structural polyprotein which is matured in cis by VP4. It also encodes an alternative ORF translated possibly 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.

Host-virus interaction

Host transcription modulation

Apoptosis modulation

IPNV induces host cell apoptosis via Bad up-regulation . Also induces caspases activation (caspase-3 and caspase-9) .
IPNV would trigger two separate death pathways via upregulation of TNF-alpha, namely the Bad-mediates apoptosis and the Rip1/ROS-mediated secondary necrotic pathway .
Upregulation of TNF-alpha may be linked to the observed NF-kappaB transcription

Matching UniProtKB/Swiss-Prot entries

(all links/actions below point to website)

8 entries grouped by strain

3 entries

Infectious pancreatic necrosis virus (strain Jasper) (IPNV) reference strain

POLS_IPNVJ Structural polyprotein (PP) [Cleaved into: Precursor of VP2 (Pre-VP2); Capsid protein VP2; ...
RDRP_IPNVJ RNA-directed RNA polymerase (RDRP) (EC (Protein VP1)
VP5_IPNVJ Protein VP5

3 entries

Infectious pancreatic necrosis virus (strain Sp) (IPNV)

POLS_IPNVS Structural polyprotein (PP) [Cleaved into: Precursor of VP2 (Pre-VP2); Capsid protein VP2; ...
RDRP_IPNVS RNA-directed RNA polymerase (RDRP) (EC (Protein VP1)
VP5_IPNVS Protein VP5

2 entries

Infectious pancreatic necrosis virus (strain N1) (IPNV)

POLS_IPNVN Structural polyprotein (PP) [Cleaved into: Precursor of VP2 (Pre-VP2); Capsid protein VP2; ...
VP5_IPNVN Protein VP5
These structures were created with the help of Colabfold by Jason Nomburg, Nathan Price and Jennifer Doudna (ModelArchive).

Tasmanian aquabirnavirus taxid:1721090

Protein ModelArchive
Protein VP5 ma-jd-viral-29155
RNA-directed RNA polymerase (EC (Protein VP1) ma-jd-viral-00271
Structural polyprotein (PP) ma-jd-viral-59766

Victorian trout aquabirnavirus taxid:1661392

Protein ModelArchive
Protein VP5 ma-jd-viral-29153
RNA-directed RNA polymerase (EC (Protein VP1) ma-jd-viral-00272
Structural polyprotein (PP) ma-jd-viral-59765