9-Taxonomy_Viruses_Feb26

In bacteria a virus encoded protein destroys the

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Unformatted text preview: embly is spontaneous (occurs by itself). •  Release : mature virions exit the host cell by means of budding or by causing lysis of the cell. Plant viruses exit and are transmiSed by means of vectors. Brock Biology of Microorganisms, 13th EdiEon. Virus replicaEon •  Latent period: eclipse + maturaEon •  Eclipse: Eme necessary for the host cells to replicate the viral genome and to synthesize the viral components. •  MaturaEon: Eme needed for the different components to be assembled. •  Release (Rise period): –  Lysis: virus- encoded proteins damage the cytoplasmic membrane. In bacteria, a virus- encoded protein destroys the pepEdoglycan layer. –  Budding •  Burst size: number of virions released (varies according to the virus, host cell, etc.). Bacterial virus: 20- 60 min. Animal virus: 8- 40h. Release by budding Bacteriophages (phages) •  Best- studied bacteriophages infect E. coli (Gram- negaEve). •  Most phages contain linear dsDNA genomes. Most are...
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