Attachment site of the genetic element e14.
The Escherichia coli K-12 genetic element, e14, contains a 216-base-pair region that is homologous to a portion of the host chromosome. This region serves as the integration site for the element. The 216-base-pair homology is interrupted by 28 mismatches distributed through the sequence. The actual integrative crossover occurs within the first 11 base pairs from one end of the region. To test factors which affect e14 site-specific recombination, we cloned the attachment sites of free e14 and the host chromosome into the same plasmid. The cloned attachment sites recombined intramolecularly in a process that required the presence of a chromosomal copy of e14 in the host cell as well as the induction of SOS. Recombination events that mimicked both integration and excision occurred under the same conditions and to roughly the same extent.
14 references, click to expand
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