Abstract
We have identified the startpoint for transcription in vitro of the tetracycline resistance gene (tet) of pBR322 and several deletion and insertion mutations which alter tet promoter structure. Tetracycline resistance in host bacteria correlates qualitatively with the efficiency of DNA fragments from these plasmids to promote tet transcription in vitro. Only in active promoters could we find by computer analysis promoter structures in which the -10 and -35 sequences and the relative spacing of the two regions agree with consensus sequence determinants. These data support the current model of the E. coli promoter sequence. Two promoter mutants gave heterogeneous 5' termini with additional A residues not encoded by the DNA sequence.
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