Barnavirus (taxid:39742)



Non-enveloped, bacilliform with a T=1 icosahedral symmetry, about 50 nm length and 20 nm large.



Linear, ssRNA(+) genome of 4 kb. The genome contains four major and three minor ORFs.


Genomic RNA serves as both the genome and viral messenger RNA. ORF2 is a polyprotein which is possibly auto-cleaved by the ORF2 viral protease. ORF3 encodes the RNA dependent RNA polymerase and may be translated by ribosomal frameshifting as an ORF2-ORF3 polyprotein. The single capsid protein (ORF4) is translated from a subgenomic RNA.




  1. Virus penetrates into the host cell.
  2. Uncoating, and release of the viral genomic RNA into the cytoplasm.
  3. Genomic RNA is translated to produce replication proteins.
  4. Replication occurs in 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. Subgenomic RNA translation gives rise to the capsid protein precursor.
  7. Assembly of new virus particles.

Matching UniProtKB/Swiss-Prot entries

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4 entries grouped by strain

4 entries

Mushroom bacilliform virus (isolate Australia/AUS LF-1) (MBV) reference strain

PTASE_MBVLF Putative serine protease (EC 3.4.21.-)
RDRP_MBVLF RNA-directed RNA polymerase (EC
CAPSD_MBVLF Capsid protein (CP) (Coat protein)
ORF1_MBVLF Uncharacterized protein ORF1