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- W1833731093 abstract "The immI operon of phage P1 contains the genes c4, icd, and ant, which are transcribed in that order from the same constitutive promoter, P51b. The gene c4 encodes an antisense RNA which inhibits the synthesis of an antirepressor by acting on a target ant mRNA. Interaction depends on the complementarity of two pairs of short sequences encompassing virs+ and the ribosome-binding site involved in ant expression. Accordingly, in a P1 virs mutant phage, antirepressor is synthesized constitutively. We have isolated lysogen-proficient, second-site suppressors of P1 virs in order to evaluate the interdependence of the immI-specific genes. From a total of 17 suppressors analyzed, 15 were found to be located in the icd gene. They were identified as frameshift mutations, containing base insertions or deletions in tandem repeats of a single base pair. One suppressor was identified as a P51b promoter-down mutation; the second site of another suppressor was found to be located in the c4 gene. Furthermore, it was shown that virs cannot be suppressed by ant (icd+) suppressors. The results confirm the model that the immI operon is transcribed as a unit, that the icd and ant genes are translationally coupled, and that the constitutive synthesis of Icd protein alone is lethal to the bacterial cell. The existence of a c4 suppressor of virs, whose effect is not yet known, points to a still more complex regulation of antirepressor synthesis than was anticipated from the model." @default.
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- W1833731093 date "1994-08-01" @default.
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- W1833731093 title "Second-site suppressors of the bacteriophage P1 virs mutant reveal the interdependence of the c4, icd, and ant genes in the P1 immI operon" @default.
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- W1833731093 doi "https://doi.org/10.1128/jb.176.16.4931-4936.1994" @default.
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