Naesvirus (taxid:2733115)

(formerly named Bcep781likevirus)



Non-enveloped, head-tail structure. The icosahedral head is about 50 nm in diameter. The tail is about 70 nm in length, contractile, has six straight fibers and a base plate.


Linear, highly, maybe completely, circularly permuted dsDNA genome of about 46-49 kb, encoding for 66-71 proteins. Also encodes a single tRNA.


Genes are transcribed by operons.



  1. Adsorption: the phage attaches to the target cell through its tail fibers.
  2. Ejection of the viral DNA into host cell cytoplasm by contraction of the tail sheath.
  3. Transcription and translation of early genes.
  4. Replication of viral DNA. Transcription and translation of late genes.
  5. Assembly of an empty procapsid and packaging of the genome.
  6. Viral tail fibers assembly and viral tail assembly.
  7. Mature virions are released from the cell by lysis.