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After infection of Escherichia coli B by bacteriophage T5, a major new protein species, as indicated by polyacrylamide gel electrophoresis, appears in the cells' membranes. Phage mutants with amber mutations in the first-step-transfer portion of their DNA have been tested for their ability to induce membrane protein synthesis after they infect E. coli B. We have found that phage with mutations in the Al gene of T5 do not induce the synthesis of the T5-specific major membrane protein, whereas phage that are mutant in the A2 gene do induce its synthesis. We conclude that gene Al must function normally for T5-specific membrane protein biosynthesis to occur and that only the first 8% (first-step-transfer piece) of the DNA need be present in the cell for synthesis to occur.

Identification of the gene controlling the synthesis of the major bacteriophage T5 membrane protein