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Direct Repeats Of The F Plasmid IncC Region Express F Incompatibility
A. Tolun, D. Helinski
Published 1981 · Biology, Medicine
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The nucleotide sequence of the incompatibility region incC, located at 45.8--46.4 kb on the F plasmid map, was determined. This region consists of 543 bp and contains sufficient information to code for only two small polypeptides of 34 and 30 amino acids each. Deletion of the ATG start codons for these two polypeptides has no effect on expression of incC incompatibility. A prominent feature of this sequence is the presence of five 22 bp direct repeats. A 58 bp segment of the incC region that contains two of these direct repeats was inserted into plasmid pACYC184, which is compatible with the F plasmid. The pACYC184 plasmid containing the direct-repeat sequences now expresses incompatibility with the F'lac plasmid and replication-proficient derivatives of the mini-F plasmid.
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