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J Virol. 1982 December; 44(3): 993-1002

Lytic action of cloned phi X174 gene E.

ABSTRACT

The phi X174 lysis gene E was placed under control of the lac promoter by cloning into the multicopy plasmid pBH20. Other phi X174 gene sequences were removed by nuclease digestion. Expression of gene E was shown to be necessary and sufficient to produce lysis phenomena exhibited by infection with intact phage. Lysis, its inhibition by MgSO4 and spermine, its progression through a spheroplasting stage, and its dependence on an early chloramphenicol-sensitive step were reproduced in clones induced for expression of the E gene product. Escherichia coli clones carrying the E gene not under lac control, and clones under lac control but only minimally induced for gene E expression, exhibited morphological aberrations consistent with the view that the mechanism by which gene E mediates cell lysis is related to host cell division processes.

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