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. 1988 Nov 11;16(21):10199–10212. doi: 10.1093/nar/16.21.10199

Structural bases of a long-stretched deletion: completing the lambda plac5 DNA primary structure.

G V Shpakovski 1, A A Akhrem 1, Berlin YuA 1
PMCID: PMC338846  PMID: 2973573

Abstract

In studying molecular mechanisms of specialised transduction, the lacI (E. coli)-Ea47 (lambda) DNA junction in transducing bacteriophage lambda plac 5 has been structurally elucidated, thus yielding the complete sequence of lambda plac 5 DNA including the lac5 substitution, a well-known segment of lambdoid vectors. The lambda plac5 DNA is shown to consist of 19368 bp (lambda left arm) + 3924 bp (lac5 substitution) + 25353 bp (lambda right arm), totally amounting to 48645 bp. The presence of the phage rho bL promoter near to the right end of the lac5 insert is shown. The lacI gene distal end in lambda plac5 proved to be much longer than it was postulated earlier, coding for 224 C-terminal amino acid residues of lac repressor. Both the recombination studied in this paper and the earlier studied abnormal prophage excision (2, 3) occur near to Chi-like structures (chi*lacI and chi*lom, respectively). On the basis of the data obtained, a key role of the E. coli RecBCD system and Chi-like sequences in the formation of deletions in bacterial cells is suggested.

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Selected References

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