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Rts1 is a plasmid which confers upon the host bacteria the capacity to restrict T4 bacteriophage growth at 32 degrees C but not at 42 degrees C. Pulse-labeling of phage-infected cells showed that Rts1 restricts the synthesis of T1 DNA. Despite efficient restriction of T4 phage growth and DNA synthesis, infected Escherichia coli 20SO harboring Rts1 synthesized both early and late T4 phage RNA. Synthesis of early T4 phage RNA under restrictive conditions (32 degrees C) was almost equal to that found under nonrestrictive conditions, and a lesser, but significant, amount of late T4 phage RNA was made in almost complete absence of T4 DNA synthesis. Moreover, very little, if any, T4 phage-coded lysozyme was detected in the infected E. coli 20SO/Rts1 at 32 degrees C, whereas normal amounts of lysozyme were present at 42 degrees C.

Bacteriophage T4-related macromolecular synthesis under restriction of plasmid Rts1