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Genetic and physiological study of phage t 4 mutations suppressing the lysis defect of gene st ii mutants



Genetic and physiological study of phage t 4 mutations suppressing the lysis defect of gene st ii mutants



Genetika 11(10): 51-60



A new gene rVI phage T4B is found. Mutations rVI belong to the class of r-mutations of T4B. Mutations rVI do not show the lysis inhibition after superinfection and determine the r-morphology of plaques on Escherichia coli CR63 lawn. Mutations rVI are gene-specific suppressors of stII lysis defect, but do not suppress the e lysis defect. Alleles rVI and rVI+ are co-dominate with regard to the ability to suppress the stII lysis defect. This suggests that stoichiometric character of rVI gene function. Mutations rVI increase the permeability of infected cells before the lysis. The gene rVI is located between the genes 56 and 39 on the T4B genetic map, close to the gene 56. The stIII mutations described earlier (Krylov, Yankovsky, 1973) suppress the lysis defect of the am z25 mutant in the gene e. The suppression is manifested when infected bacteria develope only in the liquid media.

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