Abstract
Although cells of Bacillus subtilis continue to grow after being infected by bacteriophage SPO1, they do not undergo cell division. The product of SPO1 gene 56 is necessary and sufficient for this inhibition of cell division. GP56 inhibits cell division when expressed in uninfected B. subtilis, without preventing cell growth, DNA synthesis or chromosome segregation, ultimately causing filamentation and loss of viability. During infection, a gene 56 mutation prevents the inhibition of cell division that occurs in wild-type infection. Under the laboratory conditions used, the gene 56 mutation did not affect burst size, latent period, or other components of the host-takeover process.
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