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Research Article

Spontaneous lambda OR mutations suppress inhibition of bacteriophage growth by nonimmune exclusion phenotype of defective lambda prophage.

S Hayes, C Hayes
S Hayes
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C Hayes
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ABSTRACT

Survivor clones with defects in gene functions that participate in the replicative killing of thermally induced Escherichia coli constructs with integrated lambda N through P or cIII through P gene fragments were selected at a frequency of about 10(-6). Among the population of survivors, clones were identified that exhibited normal lambda immunity at 30 degrees C, as shown by their ability to prevent the plating of lambda wild type and to support the plating of a nearly identical heteroimmune bacteriophage lambda imm434. However, when placed at 42 degrees C to inactivate the cIts857 repressor, these survivor isolates excluded the plating of both lambda wild-type and lambda imm434 phages, a phenotype designated nonimmune exclusion (Nie). Spontaneous mutants of lambda wild type were isolated that overcame the Nie phenotype and would plaque at 42 degrees C on cell lawns of these isolates. The acquired lambda se mutations suppressed nonimmune exclusion, prevented lysogenization by interrupting repressor expression from PRM, and made the phage insensitive to replicative inhibition. The se mutations were genetically mapped and sequenced within the rightward lambda operator site.

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Spontaneous lambda OR mutations suppress inhibition of bacteriophage growth by nonimmune exclusion phenotype of defective lambda prophage.
S Hayes, C Hayes
Journal of Virology Jun 1986, 58 (3) 835-842; DOI:

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Spontaneous lambda OR mutations suppress inhibition of bacteriophage growth by nonimmune exclusion phenotype of defective lambda prophage.
S Hayes, C Hayes
Journal of Virology Jun 1986, 58 (3) 835-842; DOI:
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