Benyvirus (taxid:143901)



Non-enveloped, rod shaped about 85-390 nm in length and 20 nm in diameter. The right-handed helix with a pitch of 2.6 nm has an axial repeat of four turns, involving 49 capsid subunits. Each capsid protein covers four nucleotides on the genomic RNA.



Segmented, linear, ssRNA(+) genome. The four to five segments are 1.3 to 6.7 kb in size. The genomic RNA are capped, and polyadenylated.


Genomic RNAs serve as messenger RNA. Subgenomic RNAs are synthesized during replication for segments 2. Suppression of termination on segment 2 produces the 75k protein. Leaky scanning allows expression of the movement proteins TGB2 and TGB3. Noncoding RNA3 is produced by host Xrn exonuclease which is stopped at the coremin sequence.




  1. Virus penetrates into the host cell.
  2. Uncoating, and release of the viral genomic RNA into the cytoplasm.
  3. The viral RNA is translated to produce the two proteins necessary for RNA synthesis (replication and transcription).
  4. Replication takes place in cytoplasmic viral factories. A dsRNA genome is synthesized from the genomic ssRNA(+).
  5. The dsRNA genome is transcribed/replicated thereby providing viral mRNAs/new ssRNA(+) genomes.
  6. Expression of the subgenomic RNAs (sgRNAs).
  7. Virus assembly, each segment is encapsidated.
  8. Viral TGB movement proteins probably mediate virion cell-to-cell transfer.

Host-virus interaction

Suppression of RNA silencing

The cysteine-rich protein of beet necrotic yellow vein virus and tobacco rattle virus act as suppressor of RNA silencing in roots, but not in leaves .

Matching UniProtKB/Swiss-Prot entries

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12 entries grouped by strain

9 entries

Beet necrotic yellow vein virus (isolate Japan/S) (BNYVV) reference strain

RDRP_BNYVS Replicase (237 kDa protein) [Cleaved into: Replicase large subunit (EC 2.1.1.-) (EC 2.7.7.-) (EC ...
CAPSD_BNYVS Capsid readthrough protein (CP-RT)
TGB2_BNYVS Movement protein TGB2 (13 kDa protein) (P13) (Triple gene block 2 protein) (TGBp2)
TGB3_BNYVS Movement protein TGB3 (15 kDa protein) (P15) (Triple gene block 3 protein) (TGBp3)
P25_BNYVS Protein P25 (25kDa protein)
TGB1_BNYVS Movement protein TGB1 (P42) (Triple gene block 1 protein) (TGBp1)
P26_BNYVS Protein P26 (26kDa protein)
P31_BNYVS 31 kDa protein (31k protein) (p31)
VSR_BNYVS Probable suppressor of RNA silencing (14kD cysteine rich protein) (P14)

2 entries

Beet necrotic yellow vein mosaic virus (isolate Yugoslavia/G1) (BNYVV)

Y12K_BNYVG RNA-3 uncharacterized 11.6 kDa protein
Y32K_BNYVG RNA-4 uncharacterized 31.9 kDa protein

1 entry

Beet necrotic yellow vein mosaic virus (isolate France/F2) (BNYVV)

Y25K_BNYVF RNA-3 uncharacterized 24.7 kDa protein