Narnaviridae (taxid:186766)


Capsidless virus: No virus particle could be identified, which means that this virus cannot be assigned to the Baltimore classification in the strict sense.


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

(all links/actions below point to website)

2 entries grouped by strain

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)
These structures were created with the help of Colabfold by Jason Nomburg, Nathan Price and Jennifer Doudna (ModelArchive).

Fusarium poae narnavirus 1 taxid:1849531

Protein ModelArchive
RNA-dependent RNA polymerase ma-jd-viral-36294

Fusarium poae narnavirus 2 taxid:1849532

Protein ModelArchive
RNA-dependent RNA polymerase ma-jd-viral-46570

Grapevine associated narnavirus-1 taxid:908834

Protein ModelArchive
RNA dependent RNA polymerase ma-jd-viral-19087

Phytophthora infestans RNA virus 4 taxid:1077832

Protein ModelArchive
RNA-dependent RNA polymerase ma-jd-viral-19806