Chaseviridae (taxid:2731689)

VIRION

Non-enveloped, head-tail structure with Myo-type morphology. The icosahedral head is about 53?65 nm in diameter. The contracted tail is between 116 to 166 nm in length.

GENOME

Linear, dsDNA genome of about 52-56 kb, encoding for about 90 proteins, and none or few tRNAs. It has long terminal repeats of approximately 3 kbp.

GENE EXPRESSION

Genes are transcribed by operons.

ENZYMES

• DNA-directed DNA polymerase A [C8XUU9]
• Cysteine protease (Peptidase S77) [A0A7D0NEJ1]

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.