Tunavirus (taxid:187217)

VIRION

Non-enveloped, head-tail structure. The head is about 60 nm in diameter. The tail is non-contractile and very flexible, about 151 nm in length and 8 nm in width, with 4 short kinked terminal fibers.

GENOME

Linear, dsDNA genome of about 50 kb, terminally redundant and circularly permuted, containing about 80 genes.

GENE EXPRESSION

REPLICATION

CYTOPLASMIC

1. The phage attaches to the target cell adhesion receptor FhuA through its tail fibers.
2. Ejection of the viral DNA into host cell cytoplasm by long flexible tail ejection system.
3. Transcription and translation of early genes.
4. Replication of genomic DNA, formation of viral genome concatemers.
5. Transcription and translation of late genes
6. Assembly of an empty procapsid and packaging of the genome through a headful mechanism.
7. Viral tail fibers assembly and viral tail assembly.
8. Mature virions are released from the cell by lysis.