A Phi 80 Function Inhibitory For Growth Of Lambdoid Phage In Him ...

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Abstract

Bacteriophage phi 80 and lambda-phi 80 hybrid phage of the type lambda (QSR)80, in which the rightmost 10% of the lambda genome is replaced by corresponding phi 80 material, are unable to grow lytically in himA and hip/himD mutants of Escherichia coli K12 at 32 degrees. The genetic element responsible for the growth defect, rha, has been mapped to the (QSR)80 region and was located more precisely by restriction enzyme and DNA heteroduplex analysis of mutations that result in loss of the Rha phenotype. Such an Rha mutant carrying a 1.5-kb deletion beginning 0.58 kb from the right end of the chromosome and extending leftward locates the rha locus at least in part within this region of (QSR)80. In addition, a substitution derivative of lambda (QSR)80 was isolated which does not exhibit the Rha phenotype. In this phage, lambda-80hy95, the right half of the (QSR)80 region is replaced by DNA homologous to the 95-100% segment of lambda. In mixed infections in the himA42 host at 32 degrees, lambda + does not complement lambda (QSR)80 for growth and the burst size of the coinfecting lambda + is reduced in comparison to that in a single infection. Deletion mutants of lambda (QSR)80 that grow normally in himA42 at 32 degrees in single infections are inhibited for growth in mixed infections with lambda (QSR)80. These results suggest the existence of a trans-acting function which inhibits phage growth in the absence of HimA or Hip/HimD function. It is likely that the rha gene either encodes that function or indirectly controls its action.

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