Exclusion of bacteriophage T1 by bacteriophage lambda. I. Early exclusion requires lambda N gene product and host factors involved in N gene expression

Exclusion of bacteriophage T1 by bacteriophage lambda. II. Synthesis of T1-specific macromolecules under N-mediated excluding conditions

The results of experiments investigating T1 macromolecular synthesis under N-mediated excluding conditions failed to demonstrate a substantial alteration in the T1 mRNA production in excluding cultures at any stage in the T1 infectious cycle. The number of T1 DNA sequences in the excluding culture was found to be one-third to one-half that found in T1-infected cultures. The most severe reduction in T1-specific macromolecules was seen in protein synthesis. Total incorporation of labeled amino acids was reduced sixfold, and gel experiments confirmed that the T1-specific proteins capable of detection are reduced in excluding cells.