Eucampyvirinae

VIRION

Non-enveloped, head-tail structure. The icosahedral head is about 93-96 nm in diameter. Has a neck without a collar, and a small base plate. The tail of about 96-140 nm in length and 20 nm in width is contractile. Fibers about 38 nm in length are attached on the tail.

GENOME

Linear, dsDNA genome of about 132-197 kb, encoding for about 149-245 proteins.

GENE EXPRESSION

Genes are transcribed by operons.

REPLICATION

CYTOPLASMIC

  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 the viral genome. 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.