Enquatrovirus (taxid:371730)


Non-enveloped, head-tail structure. The icosahedral capsid is about 70 nm in diameter, with a T=9 icosahedral symmetry . The virion contains about 4 copies of a viral RNA polymerase (vRNAP) .


Linear, dsDNA genome of about 70 kb encoding 72 genes.




  1. Adsorption: the phage attaches to the target cell through its tail fibers.
  2. Ejection of the viral DNA and the viral RNA polymerase (vRNAP) into host cell cytoplasm .
  3. Transcription by the vRNAP of the phage early genes.
  4. Replication of genomic DNA. Transcription (by the host RNAP) 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.

Matching UniProtKB/Swiss-Prot entries

(all links/actions below point to uniprot.org website)

7 entries grouped by strain

7 entries

Enterobacteria phage N4 (Bacteriophage N4) reference strain

RPOLV_BPN4 Virion DNA-directed RNA polymerase (vRNAP) (EC (Gene product 50) (gp50)
PORTL_BPN4 Probable portal protein (94 kDa protein) (Gene product 59) (gp59) (Head-to-tail connector)
NCTSP_BPN4 Non-contractile tail sheath (Gene product 65) (Gp65)
CAPSD_BPN4 Major capsid protein (Gene product 56) (gp56) (Major head protein)
GP8_BPN4 Gene product 8 (gp8)
YLF1_BPN4 Uncharacterized protein Gp1 (12 kDa protein in genome left end) (ORF 1)
YLF2_BPN4 Uncharacterized protein Gp2 (ORF 2)