Abstract
The DNA sequence of a 354 basepair EcoRI-HindIII fragment of plasmid pMB9 which has originally been derived from plasmid pSC101 has been resolved. This fragment contains a promoter for transcription directed towards the EcoRI site. Escherichia coli RNA polymerase binds to a region within the EcoRI-HindIII fragment which contains the heptamer 5' TATGGTG (132-126) and the duodecamer 5' TGATGAACATCA (158-147). Based on commonalities with other promotors these DNA sequences probably function as, respectively, "binding site" and "recognition site". Furthermore, this fragment harbours a translation reading frame free of nonsense codons and at about 25 basepairs from the indicated heptamer a nucleotide sequence which meets with the requirements for initiation of translation. By heteroduplex mapping it was shown that the EcoRI-HindIII fragment has been derived from a region near or within the origin of replication of pSC101. The copynumber of plasmids containing the EcoRI-HindIII fragment is two-fold lower than that of plasmids lacking this fragment. This effect might be related to the original function of this fragment on plasmid pSC101.
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