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. 1983 Nov;156(2):669–679. doi: 10.1128/jb.156.2.669-679.1983

A new insertion sequence, IS121, is found on the Mu dI1 (Ap lac) bacteriophage and the Escherichia coli K-12 chromosome.

M B O'Connor, M H Malamy
PMCID: PMC217882  PMID: 6313612

Abstract

We have discovered a new insertion sequence, now designated IS121, as a component of the Mu dI1 (Ap lac) phage. This sequence is 1.2 kilobases long and contains single recognition sites for the HincII, Bg1II, and HindIII restriction endonucleases. IS121 is present in at least three copies in the chromosome of several Escherichia coli K-12 strains. When present in the nonconjugative plasmid pBR322, IS121 can mediate cointegrate formation with an F' lac plasmid and transfer of pBR322 sequences to suitable recipients. IS121 is also capable of precise or nearly precise excision. As part of the study of IS121, we have determined the physical structure of the Mu dI1 (Ap lac) phage and established an extensive restriction endonuclease map of this phage. A revised schema for the formation of the Mu dI1 (Ap lac) phage is presented.

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Selected References

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