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. 1984 Nov;160(2):642–650. doi: 10.1128/jb.160.2.642-650.1984

Spontaneous deletion of citrate-utilizing ability promoted by insertion sequences.

N Ishiguro, G Sato
PMCID: PMC214783  PMID: 6094480

Abstract

The citrate utilization (Cit+) transposon Tn3411 was shown to be flanked by directly repeated sequences (IS3411L and IS3411R) by restriction enzyme analysis and electron microscope observation. Cit- deletion mutants were frequently found to be generated in pBR322::Tn3411 by intramolecular recombination between the two copies of IS3411. The flanking IS3411 elements of Tn3411 were shown to be functional insertion sequences by Tn3411-mediated direct and inverse transposition. Tn3411-mediated inverse transposition from pBR322::Tn3411 to the F-plasmid derivative pED100 occurred more efficiently than that of direct transposition of the Cit+ determinant. This was thought to be due to the differential transposability of IS3411L and IS3411R in the transposition process. The frequency of transposition of IS3411 marked with a chloramphenicol resistance determinant was much higher than IS3411-mediated cointegrate formation, suggesting that replicon fusions are not essential intermediates in the transposition process of Tn3411 or IS3411. Spontaneous deletions occurred with high frequency in recA hosts. The spontaneous deletion promoted by homologous recombination between two IS3411 elements in Tn3411 was examined with deletion mutants.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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