Abstract
Transducing lambda phages have been isolated that carry segments of the Escherichia coli chromosome in the aspC region, 20.5 min on the E. coli map. One of these phages, lambda aspC2, carries rpsA, the structural gene for the ribosomal protein S1. A three kilobase fragment from this phage, cloned into either the plasmid pACYC184 or the plasmid pBR322, was found to express S1. In cells carrying the rpsA gene on the high copy number plasmid pBR322 the rate of rpsA mRNA synthesis was increased 40-fold, whereas the rate of protein S1 synthesis was doubled, in comparison with these rates in an rpsA haploid.
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