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Formation of the prohead core of bacteriophage T4 in vivo

Formation of the prohead core of bacteriophage T4 was not dependent on shell assembly. In mutant infections, where the production or assembly of active shell protein was not possible, naked core structures were formed. The particles were generally attached to the bacterial inner membrane and possessed defined prolate dimensions. The intracellular yield varied between 15 and 71% of a corresponding prohead yield and was dependent on the temperature of incubation. The products of genes 21 and 22 were found to be essential for in vivo core formation, whereas those of genes 20, 23, 24, 31, and 40, as well as the internal proteins I to III, were dispensable.