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The genetic switch of Lactobacillus casei bacteriophage A2 is regulated by the CI protein, which represses the early lytic promoter PR and Cro that abolishes expression from the lysogenic promoter PL. Lysogens contain equivalent cI and cro‐gp25 mRNA concentrations, i.e., CI only partially represses PR, predicting a lytic cycle dominance. However, A2 generates stable lysogens. This may be due to Gp25...
Expression of bacteriophage A2-encoded cro in Escherichia coli gives rise to two co-linear polypeptides, Cro and Cro*, which were proposed to form a regulatory tandem to modulate the frequency with which the phage would choose between the lytic and the lysogenic cycles. In this communication, it is reported that Cro is the canonical product of the gene cro while Cro* results from a −1 ribosome frameshift...
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