No true virion, no structural proteins. Genomes are associated with their RdRp in the cytoplasm.


Monopartite, linear, ssRNA(+) genome of of 2.5-2.9 kb.


The virion RNA is infectious and serves as both the genome and viral messenger RNA. The genome has one ORF encoding an RNA-dependent RNA polymerase.



  1. Virus genome is transmitted horizontally through mating or vertically from mother to daughter cells.
  2. Translation of genomic RNA produces viral RdRp.
  3. A dsRNA genome is synthesized from the genomic ssRNA(+).
  4. The dsRNA genome is transcribed/replicated thereby providing viral mRNAs/new ssRNA(+) genomes.
  5. Mature genomes can be transmitted to new cell by cytoplasmic exchange, sporogenesis or hyphal anastomosis.

Matching UniProtKB/Swiss-Prot entries

3 entries grouped by strain (browse by keywords)

1 entry

Cryphonectria parasitica mitovirus 1 (strain American chestnut tree/New Jersey/NB631) (CMV1) (Cryphonectria mitovirus 1) reference strain

RDRP_CPMV1 RNA-directed RNA polymerase (EC (p93)

1 entry

Saccharomyces 20S RNA narnavirus (ScNV-20S) reference strain

RDRP_SCV20 RNA-directed RNA polymerase (EC (p91)

1 entry

Saccharomyces 23S RNA narnavirus (ScNV-23S)

RDRP_SCV23 RNA-directed RNA polymerase (EC (p104)