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Regulation of the int gene of bacteriophage λ: Activation by the cII and cIII gene products and the role of the P I and P L promoters

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Summary

The activation of the int gene by the cII and cIII gene products was studied by analysing int expression following infection of UV-irradiated cells by various phage mutants. Residual expression of int, probably from P L, takes place in the absence of cII/cIII activation. Activation of the int gene, like that of the cI repressor gene, is poor at low multiplicities of infection. The mutation intC, which allows constitutive int expression in the lysogenic state, partially relieves the requirement for cII and cIII activation. The kinetics of Int synthesis after addition of the inhibitor rifampicin suggest that the activation occurs at the transcriptional level.

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  1. Department of Microbiological Chemistry, The Hebrew University-Hadassah Medical School, Jerusalem, Israel

    Ariella Oppenheim & Amos B. Oppenheim

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  1. Ariella Oppenheim
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  2. Amos B. Oppenheim
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Communicated by W. Arber

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Oppenheim, A., Oppenheim, A.B. Regulation of the int gene of bacteriophage λ: Activation by the cII and cIII gene products and the role of the P I and P L promoters. Molec. Gen. Genet. 165, 39–46 (1978). https://doi.org/10.1007/BF00270374

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  • DOI: https://doi.org/10.1007/BF00270374

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